sccache fails to compile Qt: hash collision between precompiled headers and object files

[jimis]

Simplest way to reproduce the issue (EDIT as of 2024-10-04)

  $ touch empty.c
  $ gcc              -c -o out1 empty.c
  $ gcc  -x c-header -c -o out2 empty.c
  $ file out1 out2
  out1: ELF 64-bit LSB relocatable, x86-64, version 1 (SYSV), not stripped
  out2: GCC precompiled header (version 014) for C

The two files are different. But if we feed these compilations to sccache, they lead to the same result:

  $ sccache gcc              -c -o out3 empty.c
  $ sccache gcc  -x c-header -c -o out4 empty.c
  $ file out3 out4
  out3: ELF 64-bit LSB relocatable, x86-64, version 1 (SYSV), not stripped
  out4: ELF 64-bit LSB relocatable, x86-64, version 1 (SYSV), not stripped

Old Summary

$ sccache --version
sccache 0.5.4

The problem manifests as this error message during linking:

src/corelib/CMakeFiles/Core.dir/global/archdetect.cpp.o: file not recognized: file format not recognized
collect2: error: ld returned 1 exit status

The reason is that archdetect.cpp.o and a few other files, have been mis-compiled to contain precompiled headers instead of object code:

$ md5sum ./src/corelib/CMakeFiles/Core.dir/tools/qrefcount.cpp.o ./src/corelib/CMakeFiles/Core.dir/global/archdetect.cpp.o ./src/corelib/CMakeFiles/Core.dir/kernel/qpointer.cpp.o ./src/corelib/CMakeFiles/Core.dir/cmake_pch.hxx.gch
7191dea52ae41f322943e6b088b539aa  ./src/corelib/CMakeFiles/Core.dir/tools/qrefcount.cpp.o
7191dea52ae41f322943e6b088b539aa  ./src/corelib/CMakeFiles/Core.dir/global/archdetect.cpp.o
7191dea52ae41f322943e6b088b539aa  ./src/corelib/CMakeFiles/Core.dir/kernel/qpointer.cpp.o
7191dea52ae41f322943e6b088b539aa  ./src/corelib/CMakeFiles/Core.dir/cmake_pch.hxx.gch    # NOTE: this file is correct

Digging into the problem

Command lines generated by ninja on the client

cmake_pch.hxx.gch

[420/2442] sccache /usr/bin/g++ -DBACKTRACE_HEADER="execinfo.h" -DCore_EXPORTS -DELF_INTERPRETER="/lib64/ld-linux-x86-64.so.2" -DPCRE2_CODE_UNIT_WIDTH=16 -DQT_ASCII_CAST_WARNINGS -DQT_BUILDING_QT -DQT_BUILD_CORE_LIB -DQT_DEPRECATED_WARNINGS -DQT_DISABLE_DEPRECATED_UP_TO=0x050000 -DQT_EXPLICIT_QFILE_CONSTRUCTION_FROM_PATH -DQT_LEAN_HEADERS=1 -DQT_MOC_COMPAT -DQT_NO_AS_CONST -DQT_NO_CAST_TO_ASCII -DQT_NO_CONTEXTLESS_CONNECT -DQT_NO_DEBUG -DQT_NO_FOREACH -DQT_NO_JAVA_STYLE_ITERATORS -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DQT_NO_QEXCHANGE -DQT_NO_USING_NAMESPACE -DQT_TYPESAFE_FLAGS -DQT_USE_QSTRINGBUILDER -DQT_WARN_DEPRECATED_UP_TO=0x070000 -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I/home/qt/work/qt/qtbase_build/src/corelib/Core_autogen/include -I/home/qt/work/qt/qtbase_build/include -I/home/qt/work/qt/qtbase_build/include/QtCore -I/home/qt/work/qt/qtbase/src/corelib -I/home/qt/work/qt/qtbase_build/src/corelib -I/home/qt/work/qt/qtbase_build/src/corelib/global -I/home/qt/work/qt/qtbase_build/src/corelib/kernel -I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/tinycbor/src -I/home/qt/work/qt/qtbase_build/include/QtCore/6.7.0 -I/home/qt/work/qt/qtbase_build/include/QtCore/6.7.0/QtCore -I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/double-conversion/double-conversion -I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/double-conversion -I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/forkfd -I/home/qt/work/qt/qtbase_build/src/corelib/.rcc -I/home/qt/work/qt/qtbase/mkspecs/linux-g++ -I/home/qt/work/qt/qtbase/src/3rdparty/pcre2/src -isystem /usr/include/glib-2.0 -isystem /usr/lib/x86_64-linux-gnu/glib-2.0/include -g -DNDEBUG -O3 -fPIC -fvisibility=hidden -fvisibility-inlines-hidden -Wall -Wextra -Wsuggest-override -fcf-protection=full -std=c++17 -Winvalid-pch -x c++-header -include /home/qt/work/qt/qtbase_build/src/corelib/CMakeFiles/Core.dir/cmake_pch.hxx -MD -MT src/corelib/CMakeFiles/Core.dir/cmake_pch.hxx.gch -MF src/corelib/CMakeFiles/Core.dir/cmake_pch.hxx.gch.d -o src/corelib/CMakeFiles/Core.dir/cmake_pch.hxx.gch -c /home/qt/work/qt/qtbase_build/src/corelib/CMakeFiles/Core.dir/cmake_pch.hxx.cxx

qpointer.cpp.o

[496/2442] sccache /usr/bin/g++ -DBACKTRACE_HEADER="execinfo.h" -DCore_EXPORTS -DELF_INTERPRETER="/lib64/ld-linux-x86-64.so.2" -DPCRE2_CODE_UNIT_WIDTH=16 -DQT_ASCII_CAST_WARNINGS -DQT_BUILDING_QT -DQT_BUILD_CORE_LIB -DQT_DEPRECATED_WARNINGS -DQT_DISABLE_DEPRECATED_UP_TO=0x050000 -DQT_EXPLICIT_QFILE_CONSTRUCTION_FROM_PATH -DQT_LEAN_HEADERS=1 -DQT_MOC_COMPAT -DQT_NO_AS_CONST -DQT_NO_CAST_TO_ASCII -DQT_NO_CONTEXTLESS_CONNECT -DQT_NO_DEBUG -DQT_NO_FOREACH -DQT_NO_JAVA_STYLE_ITERATORS -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DQT_NO_QEXCHANGE -DQT_NO_USING_NAMESPACE -DQT_TYPESAFE_FLAGS -DQT_USE_QSTRINGBUILDER -DQT_WARN_DEPRECATED_UP_TO=0x070000 -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I/home/qt/work/qt/qtbase_build/src/corelib/Core_autogen/include -I/home/qt/work/qt/qtbase_build/include -I/home/qt/work/qt/qtbase_build/include/QtCore -I/home/qt/work/qt/qtbase/src/corelib -I/home/qt/work/qt/qtbase_build/src/corelib -I/home/qt/work/qt/qtbase_build/src/corelib/global -I/home/qt/work/qt/qtbase_build/src/corelib/kernel -I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/tinycbor/src -I/home/qt/work/qt/qtbase_build/include/QtCore/6.7.0 -I/home/qt/work/qt/qtbase_build/include/QtCore/6.7.0/QtCore -I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/double-conversion/double-conversion -I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/double-conversion -I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/forkfd -I/home/qt/work/qt/qtbase_build/src/corelib/.rcc -I/home/qt/work/qt/qtbase/mkspecs/linux-g++ -I/home/qt/work/qt/qtbase/src/3rdparty/pcre2/src -isystem /usr/include/glib-2.0 -isystem /usr/lib/x86_64-linux-gnu/glib-2.0/include -g -DNDEBUG -O3 -fPIC -fvisibility=hidden -fvisibility-inlines-hidden -Wall -Wextra -Wsuggest-override -fcf-protection=full -std=c++17 -Winvalid-pch -include /home/qt/work/qt/qtbase_build/src/corelib/CMakeFiles/Core.dir/cmake_pch.hxx -MD -MT src/corelib/CMakeFiles/Core.dir/kernel/qpointer.cpp.o -MF src/corelib/CMakeFiles/Core.dir/kernel/qpointer.cpp.o.d -o src/corelib/CMakeFiles/Core.dir/kernel/qpointer.cpp.o -c /home/qt/work/qt/qtbase/src/corelib/kernel/qpointer.cpp

Trace logs on the (local) server

cmake_pch.hxx.gch

[2023-08-01T12:21:53Z DEBUG sccache::server] handle_client: compile
[2023-08-01T12:21:53Z TRACE sccache::server] compiler_info
[2023-08-01T12:21:53Z TRACE sccache::server] compiler_info cache hit
[2023-08-01T12:21:53Z DEBUG sccache::server] check_compiler: Supported compiler
[2023-08-01T12:21:53Z DEBUG sccache::server] parse_arguments: Ok: ["-DBACKTRACE_HEADER=\"execinfo.h\"", "-DCore_EXPORTS", "-DELF_INTERPRETER=\"/lib64/ld-linux-x86-64.so.2\"", "-DPCRE2_CODE_UNIT_WIDTH=16", "-DQT_ASCII_CAST_WARNINGS", "-DQT_BUILDING_QT", "-DQT_BUILD_CORE_LIB", "-DQT_DEPRECATED_WARNINGS", "-DQT_DISABLE_DEPRECATED_UP_TO=0x050000", "-DQT_EXPLICIT_QFILE_CONSTRUCTION_FROM_PATH", "-DQT_LEAN_HEADERS=1", "-DQT_MOC_COMPAT", "-DQT_NO_AS_CONST", "-DQT_NO_CAST_TO_ASCII", "-DQT_NO_CONTEXTLESS_CONNECT", "-DQT_NO_DEBUG", "-DQT_NO_FOREACH", "-DQT_NO_JAVA_STYLE_ITERATORS", "-DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT", "-DQT_NO_QEXCHANGE", "-DQT_NO_USING_NAMESPACE", "-DQT_TYPESAFE_FLAGS", "-DQT_USE_QSTRINGBUILDER", "-DQT_WARN_DEPRECATED_UP_TO=0x070000", "-D_LARGEFILE64_SOURCE", "-D_LARGEFILE_SOURCE", "-I/home/qt/work/qt/qtbase_build/src/corelib/Core_autogen/include", "-I/home/qt/work/qt/qtbase_build/include", "-I/home/qt/work/qt/qtbase_build/include/QtCore", "-I/home/qt/work/qt/qtbase/src/corelib", "-I/home/qt/work/qt/qtbase_build/src/corelib", "-I/home/qt/work/qt/qtbase_build/src/corelib/global", "-I/home/qt/work/qt/qtbase_build/src/corelib/kernel", "-I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/tinycbor/src", "-I/home/qt/work/qt/qtbase_build/include/QtCore/6.7.0", "-I/home/qt/work/qt/qtbase_build/include/QtCore/6.7.0/QtCore", "-I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/double-conversion/double-conversion", "-I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/double-conversion", "-I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/forkfd", "-I/home/qt/work/qt/qtbase_build/src/corelib/.rcc", "-I/home/qt/work/qt/qtbase/mkspecs/linux-g++", "-I/home/qt/work/qt/qtbase/src/3rdparty/pcre2/src", "-isystem", "/usr/include/glib-2.0", "-isystem", "/usr/lib/x86_64-linux-gnu/glib-2.0/include", "-g", "-DNDEBUG", "-O3", "-fPIC", "-fvisibility=hidden", "-fvisibility-inlines-hidden", "-Wall", "-Wextra", "-Wsuggest-override", "-fcf-protection=full", "-std=c++17", "-Winvalid-pch", "-x", "c++-header", "-include", "/home/qt/work/qt/qtbase_build/src/corelib/CMakeFiles/Core.dir/cmake_pch.hxx", "-MD", "-MT", "src/corelib/CMakeFiles/Core.dir/cmake_pch.hxx.gch", "-MF", "src/corelib/CMakeFiles/Core.dir/cmake_pch.hxx.gch.d", "-o", "src/corelib/CMakeFiles/Core.dir/cmake_pch.hxx.gch", "-c", "/home/qt/work/qt/qtbase_build/src/corelib/CMakeFiles/Core.dir/cmake_pch.hxx.cxx"]
[2023-08-01T12:21:53Z TRACE tokio_util::codec::framed_impl] flushing framed transport
[2023-08-01T12:21:53Z TRACE tokio_util::codec::framed_impl] writing; remaining=12
[2023-08-01T12:21:53Z TRACE tokio_util::codec::framed_impl] framed transport flushed
[2023-08-01T12:21:53Z DEBUG sccache::compiler::compiler] [cmake_pch.hxx.gch]: get_cached_or_compile: ["-DBACKTRACE_HEADER=\"execinfo.h\"", "-DCore_EXPORTS", "-DELF_INTERPRETER=\"/lib64/ld-linux-x86-64.so.2\"", "-DPCRE2_CODE_UNIT_WIDTH=16", "-DQT_ASCII_CAST_WARNINGS", "-DQT_BUILDING_QT", "-DQT_BUILD_CORE_LIB", "-DQT_DEPRECATED_WARNINGS", "-DQT_DISABLE_DEPRECATED_UP_TO=0x050000", "-DQT_EXPLICIT_QFILE_CONSTRUCTION_FROM_PATH", "-DQT_LEAN_HEADERS=1", "-DQT_MOC_COMPAT", "-DQT_NO_AS_CONST", "-DQT_NO_CAST_TO_ASCII", "-DQT_NO_CONTEXTLESS_CONNECT", "-DQT_NO_DEBUG", "-DQT_NO_FOREACH", "-DQT_NO_JAVA_STYLE_ITERATORS", "-DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT", "-DQT_NO_QEXCHANGE", "-DQT_NO_USING_NAMESPACE", "-DQT_TYPESAFE_FLAGS", "-DQT_USE_QSTRINGBUILDER", "-DQT_WARN_DEPRECATED_UP_TO=0x070000", "-D_LARGEFILE64_SOURCE", "-D_LARGEFILE_SOURCE", "-I/home/qt/work/qt/qtbase_build/src/corelib/Core_autogen/include", "-I/home/qt/work/qt/qtbase_build/include", "-I/home/qt/work/qt/qtbase_build/include/QtCore", "-I/home/qt/work/qt/qtbase/src/corelib", "-I/home/qt/work/qt/qtbase_build/src/corelib", "-I/home/qt/work/qt/qtbase_build/src/corelib/global", "-I/home/qt/work/qt/qtbase_build/src/corelib/kernel", "-I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/tinycbor/src", "-I/home/qt/work/qt/qtbase_build/include/QtCore/6.7.0", "-I/home/qt/work/qt/qtbase_build/include/QtCore/6.7.0/QtCore", "-I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/double-conversion/double-conversion", "-I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/double-conversion", "-I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/forkfd", "-I/home/qt/work/qt/qtbase_build/src/corelib/.rcc", "-I/home/qt/work/qt/qtbase/mkspecs/linux-g++", "-I/home/qt/work/qt/qtbase/src/3rdparty/pcre2/src", "-isystem", "/usr/include/glib-2.0", "-isystem", "/usr/lib/x86_64-linux-gnu/glib-2.0/include", "-g", "-DNDEBUG", "-O3", "-fPIC", "-fvisibility=hidden", "-fvisibility-inlines-hidden", "-Wall", "-Wextra", "-Wsuggest-override", "-fcf-protection=full", "-std=c++17", "-Winvalid-pch", "-x", "c++-header", "-include", "/home/qt/work/qt/qtbase_build/src/corelib/CMakeFiles/Core.dir/cmake_pch.hxx", "-MD", "-MT", "src/corelib/CMakeFiles/Core.dir/cmake_pch.hxx.gch", "-MF", "src/corelib/CMakeFiles/Core.dir/cmake_pch.hxx.gch.d", "-o", "src/corelib/CMakeFiles/Core.dir/cmake_pch.hxx.gch", "-c", "/home/qt/work/qt/qtbase_build/src/corelib/CMakeFiles/Core.dir/cmake_pch.hxx.cxx"]
[2023-08-01T12:21:53Z TRACE sccache::compiler::gcc] preprocess
[2023-08-01T12:21:53Z DEBUG sccache::compiler::gcc] arch args before rewrite: []
[2023-08-01T12:21:53Z DEBUG sccache::compiler::gcc] cmd after -arch rewrite: Some(cd "/home/qt/work/qt/qtbase_build" && ANDROID_API_VERSION="android-33" ANDROID_EMULATOR_RUNNER="/home/qt/android_emulator_launcher.sh" ANDROID_NDK_HOST="linux-x86_64" ANDROID_NDK_ROOT_DEFAULT="/opt/android/android-ndk-r25b" ANDROID_NDK_ROOT_LATEST="/opt/android/android-ndk-r25b" ANDROID_SDK_ROOT="/opt/android/sdk" BREAKPAD_SOURCE_DIR="/home/qt/breakpad" CONAN_REVISIONS_ENABLED="1" CONAN_V2_MODE="1" DBUS_SESSION_BUS_ADDRESS="unix:path=/run/user/1000/bus" FBXSDK="/opt/fbx" FFMPEG_DIR="/usr/local/FFmpeg-n6.0" HOME="/home/qt" LANG="en_US.UTF-8" LC_ADDRESS="en_US.UTF-8" LC_ALL="en_US.UTF8" LC_IDENTIFICATION="en_US.UTF-8" LC_MEASUREMENT="en_US.UTF-8" LC_MONETARY="en_US.UTF-8" LC_NAME="en_US.UTF-8" LC_NUMERIC="en_US.UTF-8" LC_PAPER="en_US.UTF-8" LC_TELEPHONE="en_US.UTF-8" LC_TIME="en_US.UTF-8" LLVM_DYNAMIC_LIBS_100="/usr/local/libclang-dynlibs-10.0" LLVM_INSTALL_DIR="/usr/local/libclang-15.0.0" LOGNAME="qt" MOTD_SHOWN="pam" MQTT_TEST_BROKER_LOCATION="/opt/paho_broker/interoperability/startbroker.py" OLDPWD="/home/qt" OPENSSL_ANDROID_HOME_DEFAULT="/home/qt/prebuilt-openssl-3.0.7-for-android-ndk-r25b" OPENSSL_ANDROID_HOME_LATEST="/home/qt/prebuilt-openssl-3.0.7-for-android-ndk-r25b" PAPERSIZE="letter" PATH="/opt/cmake-3.24.2/bin:/home/qt/.local/bin:/home/qt/sccache_wrapper:/usr/local/sccache:/opt/node-v18.16.0-linux-x64/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin" QEMUARM64_TOOLCHAIN_CROSS_COMPILE="/opt/b2qt/3.2/sysroots/x86_64-pokysdk-linux/usr/bin/aarch64-poky-linux/aarch64-poky-linux-" QEMUARM64_TOOLCHAIN_ENVSETUP="/opt/b2qt/3.2/environment-setup-cortexa57-poky-linux" QEMUARM64_TOOLCHAIN_FILE="/opt/b2qt/3.2/sysroots/x86_64-pokysdk-linux/usr/share/cmake/OEToolchainConfig.cmake" QEMUARM64_TOOLCHAIN_SYSROOT="/opt/b2qt/3.2/sysroots/cortexa57-poky-linux" QEMUARMV7_TOOLCHAIN_CROSS_COMPILE="/opt/b2qt/3.2/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux-gnueabi/arm-poky-linux-gnueabi-" QEMUARMV7_TOOLCHAIN_ENVSETUP="/opt/b2qt/3.2/environment-setup-armv7vet2hf-neon-poky-linux-gnueabi" QEMUARMV7_TOOLCHAIN_FILE="/opt/b2qt/3.2/sysroots/x86_64-pokysdk-linux/usr/share/cmake/OEToolchainConfig.cmake" QEMUARMV7_TOOLCHAIN_SYSROOT="/opt/b2qt/3.2/sysroots/armv7vet2hf-neon-poky-linux-gnueabi" QEMUMIPS64_TOOLCHAIN_CROSS_COMPILE="/opt/b2qt/3.2/sysroots/x86_64-pokysdk-linux/usr/bin/mips64-poky-linux/mips64-poky-linux-" QEMUMIPS64_TOOLCHAIN_ENVSETUP="/opt/b2qt/3.2/environment-setup-mips64r2-poky-linux" QEMUMIPS64_TOOLCHAIN_FILE="/opt/b2qt/3.2/sysroots/x86_64-pokysdk-linux/usr/share/cmake/OEToolchainConfig.cmake" QEMUMIPS64_TOOLCHAIN_SYSROOT="/opt/b2qt/3.2/sysroots/mips64r2-poky-linux" QEMU_SET_ENV="QT_WAYLAND_DISABLE_WINDOWDECORATION=1" QNX_710="/opt/qnx710" QNX_QEMU="/home/qt/QNX" QNX_QEMU_IPADDR="172.31.1.10" QNX_QEMU_LD_LIBRARY_PATH="/proc/boot:/system/lib:/system/lib/dll:/home/qt/work/install/target/lib" QNX_QEMU_SSH="root@172.31.1.10" SCCACHE_IDLE_TIMEOUT="0" SCCACHE_IGNORE_SERVER_IO_ERROR="1" SCCACHE_LOG="trace" SHELL="/bin/bash" SHLVL="2" SSH_CLIENT="10.9.70.65 50596 22" SSH_CONNECTION="10.9.70.65 50596 10.215.244.133 22" SSH_TTY="/dev/pts/0" TERM="xterm-256color" USER="qt" XDG_DATA_DIRS="/usr/share/gnome:/usr/local/share:/usr/share:/var/lib/snapd/desktop" XDG_RUNTIME_DIR="/run/user/1000" XDG_SESSION_CLASS="user" XDG_SESSION_ID="3" XDG_SESSION_TYPE="tty" _="/usr/local/sccache/sccache" absl_ROOT="/home/qt/install-grpc-1.50.1" gRPC_ROOT="/home/qt/install-grpc-1.50.1" "/usr/bin/g++" "-x" "c++-header" "-E" "-P" "/home/qt/work/qt/qtbase_build/src/corelib/CMakeFiles/Core.dir/cmake_pch.hxx.cxx" "-I/home/qt/work/qt/qtbase_build/src/corelib/Core_autogen/include" "-I/home/qt/work/qt/qtbase_build/include" "-I/home/qt/work/qt/qtbase_build/include/QtCore" "-I/home/qt/work/qt/qtbase/src/corelib" "-I/home/qt/work/qt/qtbase_build/src/corelib" "-I/home/qt/work/qt/qtbase_build/src/corelib/global" "-I/home/qt/work/qt/qtbase_build/src/corelib/kernel" "-I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/tinycbor/src" "-I/home/qt/work/qt/qtbase_build/include/QtCore/6.7.0" "-I/home/qt/work/qt/qtbase_build/include/QtCore/6.7.0/QtCore" "-I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/double-conversion/double-conversion" "-I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/double-conversion" "-I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/forkfd" "-I/home/qt/work/qt/qtbase_build/src/corelib/.rcc" "-I/home/qt/work/qt/qtbase/mkspecs/linux-g++" "-I/home/qt/work/qt/qtbase/src/3rdparty/pcre2/src" "-isystem" "/usr/include/glib-2.0" "-isystem" "/usr/lib/x86_64-linux-gnu/glib-2.0/include" "-include" "/home/qt/work/qt/qtbase_build/src/corelib/CMakeFiles/Core.dir/cmake_pch.hxx" "-MD" "-MF" "src/corelib/CMakeFiles/Core.dir/cmake_pch.hxx.gch.d" "-MT" "src/corelib/CMakeFiles/Core.dir/cmake_pch.hxx.gch" "-DBACKTRACE_HEADER=\"execinfo.h\"" "-DCore_EXPORTS" "-DELF_INTERPRETER=\"/lib64/ld-linux-x86-64.so.2\"" "-DPCRE2_CODE_UNIT_WIDTH=16" "-DQT_ASCII_CAST_WARNINGS" "-DQT_BUILDING_QT" "-DQT_BUILD_CORE_LIB" "-DQT_DEPRECATED_WARNINGS" "-DQT_DISABLE_DEPRECATED_UP_TO=0x050000" "-DQT_EXPLICIT_QFILE_CONSTRUCTION_FROM_PATH" "-DQT_LEAN_HEADERS=1" "-DQT_MOC_COMPAT" "-DQT_NO_AS_CONST" "-DQT_NO_CAST_TO_ASCII" "-DQT_NO_CONTEXTLESS_CONNECT" "-DQT_NO_DEBUG" "-DQT_NO_FOREACH" "-DQT_NO_JAVA_STYLE_ITERATORS" "-DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT" "-DQT_NO_QEXCHANGE" "-DQT_NO_USING_NAMESPACE" "-DQT_TYPESAFE_FLAGS" "-DQT_USE_QSTRINGBUILDER" "-DQT_WARN_DEPRECATED_UP_TO=0x070000" "-D_LARGEFILE64_SOURCE" "-D_LARGEFILE_SOURCE" "-g" "-DNDEBUG" "-O3" "-fPIC" "-fvisibility=hidden" "-fvisibility-inlines-hidden" "-Wall" "-Wextra" "-Wsuggest-override" "-fcf-protection=full" "-std=c++17" "-Winvalid-pch")
[2023-08-01T12:21:53Z TRACE sccache::compiler::gcc] preprocess: Some(cd "/home/qt/work/qt/qtbase_build" && ANDROID_API_VERSION="android-33" ANDROID_EMULATOR_RUNNER="/home/qt/android_emulator_launcher.sh" ANDROID_NDK_HOST="linux-x86_64" ANDROID_NDK_ROOT_DEFAULT="/opt/android/android-ndk-r25b" ANDROID_NDK_ROOT_LATEST="/opt/android/android-ndk-r25b" ANDROID_SDK_ROOT="/opt/android/sdk" BREAKPAD_SOURCE_DIR="/home/qt/breakpad" CONAN_REVISIONS_ENABLED="1" CONAN_V2_MODE="1" DBUS_SESSION_BUS_ADDRESS="unix:path=/run/user/1000/bus" FBXSDK="/opt/fbx" FFMPEG_DIR="/usr/local/FFmpeg-n6.0" HOME="/home/qt" LANG="en_US.UTF-8" LC_ADDRESS="en_US.UTF-8" LC_ALL="en_US.UTF8" LC_IDENTIFICATION="en_US.UTF-8" LC_MEASUREMENT="en_US.UTF-8" LC_MONETARY="en_US.UTF-8" LC_NAME="en_US.UTF-8" LC_NUMERIC="en_US.UTF-8" LC_PAPER="en_US.UTF-8" LC_TELEPHONE="en_US.UTF-8" LC_TIME="en_US.UTF-8" LLVM_DYNAMIC_LIBS_100="/usr/local/libclang-dynlibs-10.0" LLVM_INSTALL_DIR="/usr/local/libclang-15.0.0" LOGNAME="qt" MOTD_SHOWN="pam" MQTT_TEST_BROKER_LOCATION="/opt/paho_broker/interoperability/startbroker.py" OLDPWD="/home/qt" OPENSSL_ANDROID_HOME_DEFAULT="/home/qt/prebuilt-openssl-3.0.7-for-android-ndk-r25b" OPENSSL_ANDROID_HOME_LATEST="/home/qt/prebuilt-openssl-3.0.7-for-android-ndk-r25b" PAPERSIZE="letter" PATH="/opt/cmake-3.24.2/bin:/home/qt/.local/bin:/home/qt/sccache_wrapper:/usr/local/sccache:/opt/node-v18.16.0-linux-x64/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin" QEMUARM64_TOOLCHAIN_CROSS_COMPILE="/opt/b2qt/3.2/sysroots/x86_64-pokysdk-linux/usr/bin/aarch64-poky-linux/aarch64-poky-linux-" QEMUARM64_TOOLCHAIN_ENVSETUP="/opt/b2qt/3.2/environment-setup-cortexa57-poky-linux" QEMUARM64_TOOLCHAIN_FILE="/opt/b2qt/3.2/sysroots/x86_64-pokysdk-linux/usr/share/cmake/OEToolchainConfig.cmake" QEMUARM64_TOOLCHAIN_SYSROOT="/opt/b2qt/3.2/sysroots/cortexa57-poky-linux" QEMUARMV7_TOOLCHAIN_CROSS_COMPILE="/opt/b2qt/3.2/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux-gnueabi/arm-poky-linux-gnueabi-" QEMUARMV7_TOOLCHAIN_ENVSETUP="/opt/b2qt/3.2/environment-setup-armv7vet2hf-neon-poky-linux-gnueabi" QEMUARMV7_TOOLCHAIN_FILE="/opt/b2qt/3.2/sysroots/x86_64-pokysdk-linux/usr/share/cmake/OEToolchainConfig.cmake" QEMUARMV7_TOOLCHAIN_SYSROOT="/opt/b2qt/3.2/sysroots/armv7vet2hf-neon-poky-linux-gnueabi" QEMUMIPS64_TOOLCHAIN_CROSS_COMPILE="/opt/b2qt/3.2/sysroots/x86_64-pokysdk-linux/usr/bin/mips64-poky-linux/mips64-poky-linux-" QEMUMIPS64_TOOLCHAIN_ENVSETUP="/opt/b2qt/3.2/environment-setup-mips64r2-poky-linux" QEMUMIPS64_TOOLCHAIN_FILE="/opt/b2qt/3.2/sysroots/x86_64-pokysdk-linux/usr/share/cmake/OEToolchainConfig.cmake" QEMUMIPS64_TOOLCHAIN_SYSROOT="/opt/b2qt/3.2/sysroots/mips64r2-poky-linux" QEMU_SET_ENV="QT_WAYLAND_DISABLE_WINDOWDECORATION=1" QNX_710="/opt/qnx710" QNX_QEMU="/home/qt/QNX" QNX_QEMU_IPADDR="172.31.1.10" QNX_QEMU_LD_LIBRARY_PATH="/proc/boot:/system/lib:/system/lib/dll:/home/qt/work/install/target/lib" QNX_QEMU_SSH="root@172.31.1.10" SCCACHE_IDLE_TIMEOUT="0" SCCACHE_IGNORE_SERVER_IO_ERROR="1" SCCACHE_LOG="trace" SHELL="/bin/bash" SHLVL="2" SSH_CLIENT="10.9.70.65 50596 22" SSH_CONNECTION="10.9.70.65 50596 10.215.244.133 22" SSH_TTY="/dev/pts/0" TERM="xterm-256color" USER="qt" XDG_DATA_DIRS="/usr/share/gnome:/usr/local/share:/usr/share:/var/lib/snapd/desktop" XDG_RUNTIME_DIR="/run/user/1000" XDG_SESSION_CLASS="user" XDG_SESSION_ID="3" XDG_SESSION_TYPE="tty" _="/usr/local/sccache/sccache" absl_ROOT="/home/qt/install-grpc-1.50.1" gRPC_ROOT="/home/qt/install-grpc-1.50.1" "/usr/bin/g++" "-x" "c++-header" "-E" "-P" "/home/qt/work/qt/qtbase_build/src/corelib/CMakeFiles/Core.dir/cmake_pch.hxx.cxx" "-I/home/qt/work/qt/qtbase_build/src/corelib/Core_autogen/include" "-I/home/qt/work/qt/qtbase_build/include" "-I/home/qt/work/qt/qtbase_build/include/QtCore" "-I/home/qt/work/qt/qtbase/src/corelib" "-I/home/qt/work/qt/qtbase_build/src/corelib" "-I/home/qt/work/qt/qtbase_build/src/corelib/global" "-I/home/qt/work/qt/qtbase_build/src/corelib/kernel" "-I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/tinycbor/src" "-I/home/qt/work/qt/qtbase_build/include/QtCore/6.7.0" "-I/home/qt/work/qt/qtbase_build/include/QtCore/6.7.0/QtCore" "-I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/double-conversion/double-conversion" "-I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/double-conversion" "-I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/forkfd" "-I/home/qt/work/qt/qtbase_build/src/corelib/.rcc" "-I/home/qt/work/qt/qtbase/mkspecs/linux-g++" "-I/home/qt/work/qt/qtbase/src/3rdparty/pcre2/src" "-isystem" "/usr/include/glib-2.0" "-isystem" "/usr/lib/x86_64-linux-gnu/glib-2.0/include" "-include" "/home/qt/work/qt/qtbase_build/src/corelib/CMakeFiles/Core.dir/cmake_pch.hxx" "-MD" "-MF" "src/corelib/CMakeFiles/Core.dir/cmake_pch.hxx.gch.d" "-MT" 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[2023-08-01T12:21:53Z TRACE mio::poll] registering event source with poller: token=Token(33554434), interests=READABLE | WRITABLE
[2023-08-01T12:21:53Z TRACE mio::poll] registering event source with poller: token=Token(33554435), interests=READABLE | WRITABLE
[2023-08-01T12:21:54Z TRACE mio::poll] deregistering event source from poller
[2023-08-01T12:21:54Z TRACE mio::poll] deregistering event source from poller
[2023-08-01T12:21:54Z TRACE sccache::util] Hashed 0 files in 0.000 s
[2023-08-01T12:21:54Z TRACE sccache::compiler::c] [cmake_pch.hxx.gch]: Preprocessor output is 3028432 bytes
[2023-08-01T12:21:54Z DEBUG sccache::compiler::compiler] [cmake_pch.hxx.gch]: generate_hash_key took 0.109 s
[2023-08-01T12:21:54Z TRACE sccache::compiler::compiler] [cmake_pch.hxx.gch]: Hash key: 586fe72d0dc68bf36a7995cb57fa05356f76548d750f215589f97c25dc733883
[2023-08-01T12:21:54Z TRACE sccache::cache::disk] DiskCache::get(586fe72d0dc68bf36a7995cb57fa05356f76548d750f215589f97c25dc733883)
[2023-08-01T12:21:54Z DEBUG sccache::compiler::compiler] [cmake_pch.hxx.gch]: Cache hit in 0.000 s

qpointer.cpp.o

[2023-08-01T12:18:44Z DEBUG sccache::server] handle_client: compile
[2023-08-01T12:18:44Z TRACE sccache::server] compiler_info
[2023-08-01T12:18:44Z TRACE sccache::server] compiler_info cache miss
[...]  # Omitting the check_compiler stuff
[2023-08-01T12:18:44Z DEBUG sccache::server] check_compiler: Supported compiler
[2023-08-01T12:18:44Z DEBUG sccache::server] parse_arguments: Ok: ["-DBACKTRACE_HEADER=\"execinfo.h\"", "-DCore_EXPORTS", "-DELF_INTERPRETER=\"/lib64/ld-linux-x86-64.so.2\"", "-DPCRE2_CODE_UNIT_WIDTH=16", "-DQT_ASCII_CAST_WARNINGS", "-DQT_BUILDING_QT", "-DQT_BUILD_CORE_LIB", "-DQT_DEPRECATED_WARNINGS", "-DQT_DISABLE_DEPRECATED_UP_TO=0x050000", "-DQT_EXPLICIT_QFILE_CONSTRUCTION_FROM_PATH", "-DQT_LEAN_HEADERS=1", "-DQT_MOC_COMPAT", "-DQT_NO_AS_CONST", "-DQT_NO_CAST_TO_ASCII", "-DQT_NO_CONTEXTLESS_CONNECT", "-DQT_NO_DEBUG", "-DQT_NO_FOREACH", "-DQT_NO_JAVA_STYLE_ITERATORS", "-DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT", "-DQT_NO_QEXCHANGE", "-DQT_NO_USING_NAMESPACE", "-DQT_TYPESAFE_FLAGS", "-DQT_USE_QSTRINGBUILDER", "-DQT_WARN_DEPRECATED_UP_TO=0x070000", "-D_LARGEFILE64_SOURCE", "-D_LARGEFILE_SOURCE", "-I/home/qt/work/qt/qtbase_build/src/corelib/Core_autogen/include", "-I/home/qt/work/qt/qtbase_build/include", "-I/home/qt/work/qt/qtbase_build/include/QtCore", "-I/home/qt/work/qt/qtbase/src/corelib", "-I/home/qt/work/qt/qtbase_build/src/corelib", "-I/home/qt/work/qt/qtbase_build/src/corelib/global", "-I/home/qt/work/qt/qtbase_build/src/corelib/kernel", "-I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/tinycbor/src", "-I/home/qt/work/qt/qtbase_build/include/QtCore/6.7.0", "-I/home/qt/work/qt/qtbase_build/include/QtCore/6.7.0/QtCore", "-I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/double-conversion/double-conversion", "-I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/double-conversion", "-I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/forkfd", "-I/home/qt/work/qt/qtbase_build/src/corelib/.rcc", "-I/home/qt/work/qt/qtbase/mkspecs/linux-g++", "-I/home/qt/work/qt/qtbase/src/3rdparty/pcre2/src", "-isystem", "/usr/include/glib-2.0", "-isystem", "/usr/lib/x86_64-linux-gnu/glib-2.0/include", "-g", "-DNDEBUG", "-O3", "-fPIC", "-fvisibility=hidden", "-fvisibility-inlines-hidden", "-Wall", "-Wextra", "-Wsuggest-override", "-fcf-protection=full", "-std=c++17", "-Winvalid-pch", "-include", "/home/qt/work/qt/qtbase_build/src/corelib/CMakeFiles/Core.dir/cmake_pch.hxx", "-MD", "-MT", "src/corelib/CMakeFiles/Core.dir/kernel/qpointer.cpp.o", "-MF", "src/corelib/CMakeFiles/Core.dir/kernel/qpointer.cpp.o.d", "-o", "src/corelib/CMakeFiles/Core.dir/kernel/qpointer.cpp.o", "-c", "/home/qt/work/qt/qtbase/src/corelib/kernel/qpointer.cpp"]
[2023-08-01T12:18:44Z TRACE tokio_util::codec::framed_impl] flushing framed transport
[2023-08-01T12:18:44Z TRACE tokio_util::codec::framed_impl] writing; remaining=12
[2023-08-01T12:18:44Z TRACE tokio_util::codec::framed_impl] framed transport flushed
[2023-08-01T12:18:44Z DEBUG sccache::compiler::compiler] [qpointer.cpp.o]: get_cached_or_compile: ["-DBACKTRACE_HEADER=\"execinfo.h\"", "-DCore_EXPORTS", "-DELF_INTERPRETER=\"/lib64/ld-linux-x86-64.so.2\"", "-DPCRE2_CODE_UNIT_WIDTH=16", "-DQT_ASCII_CAST_WARNINGS", "-DQT_BUILDING_QT", "-DQT_BUILD_CORE_LIB", "-DQT_DEPRECATED_WARNINGS", "-DQT_DISABLE_DEPRECATED_UP_TO=0x050000", "-DQT_EXPLICIT_QFILE_CONSTRUCTION_FROM_PATH", "-DQT_LEAN_HEADERS=1", "-DQT_MOC_COMPAT", "-DQT_NO_AS_CONST", "-DQT_NO_CAST_TO_ASCII", "-DQT_NO_CONTEXTLESS_CONNECT", "-DQT_NO_DEBUG", "-DQT_NO_FOREACH", "-DQT_NO_JAVA_STYLE_ITERATORS", "-DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT", "-DQT_NO_QEXCHANGE", "-DQT_NO_USING_NAMESPACE", "-DQT_TYPESAFE_FLAGS", "-DQT_USE_QSTRINGBUILDER", "-DQT_WARN_DEPRECATED_UP_TO=0x070000", "-D_LARGEFILE64_SOURCE", "-D_LARGEFILE_SOURCE", "-I/home/qt/work/qt/qtbase_build/src/corelib/Core_autogen/include", "-I/home/qt/work/qt/qtbase_build/include", "-I/home/qt/work/qt/qtbase_build/include/QtCore", "-I/home/qt/work/qt/qtbase/src/corelib", "-I/home/qt/work/qt/qtbase_build/src/corelib", "-I/home/qt/work/qt/qtbase_build/src/corelib/global", "-I/home/qt/work/qt/qtbase_build/src/corelib/kernel", "-I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/tinycbor/src", "-I/home/qt/work/qt/qtbase_build/include/QtCore/6.7.0", "-I/home/qt/work/qt/qtbase_build/include/QtCore/6.7.0/QtCore", "-I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/double-conversion/double-conversion", "-I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/double-conversion", "-I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/forkfd", "-I/home/qt/work/qt/qtbase_build/src/corelib/.rcc", "-I/home/qt/work/qt/qtbase/mkspecs/linux-g++", "-I/home/qt/work/qt/qtbase/src/3rdparty/pcre2/src", "-isystem", "/usr/include/glib-2.0", "-isystem", "/usr/lib/x86_64-linux-gnu/glib-2.0/include", "-g", "-DNDEBUG", "-O3", "-fPIC", "-fvisibility=hidden", "-fvisibility-inlines-hidden", "-Wall", "-Wextra", "-Wsuggest-override", "-fcf-protection=full", "-std=c++17", "-Winvalid-pch", "-include", "/home/qt/work/qt/qtbase_build/src/corelib/CMakeFiles/Core.dir/cmake_pch.hxx", "-MD", "-MT", "src/corelib/CMakeFiles/Core.dir/kernel/qpointer.cpp.o", "-MF", "src/corelib/CMakeFiles/Core.dir/kernel/qpointer.cpp.o.d", "-o", "src/corelib/CMakeFiles/Core.dir/kernel/qpointer.cpp.o", "-c", "/home/qt/work/qt/qtbase/src/corelib/kernel/qpointer.cpp"]
[2023-08-01T12:18:44Z TRACE sccache::compiler::gcc] preprocess
[2023-08-01T12:18:44Z DEBUG sccache::compiler::gcc] arch args before rewrite: []
[2023-08-01T12:18:44Z DEBUG sccache::compiler::gcc] cmd after -arch rewrite: Some(cd "/home/qt/work/qt/qtbase_build" && ANDROID_API_VERSION="android-33" ANDROID_EMULATOR_RUNNER="/home/qt/android_emulator_launcher.sh" ANDROID_NDK_HOST="linux-x86_64" ANDROID_NDK_ROOT_DEFAULT="/opt/android/android-ndk-r25b" ANDROID_NDK_ROOT_LATEST="/opt/android/android-ndk-r25b" ANDROID_SDK_ROOT="/opt/android/sdk" BREAKPAD_SOURCE_DIR="/home/qt/breakpad" CONAN_REVISIONS_ENABLED="1" CONAN_V2_MODE="1" DBUS_SESSION_BUS_ADDRESS="unix:path=/run/user/1000/bus" FBXSDK="/opt/fbx" FFMPEG_DIR="/usr/local/FFmpeg-n6.0" HOME="/home/qt" LANG="en_US.UTF-8" LC_ADDRESS="en_US.UTF-8" LC_ALL="en_US.UTF8" LC_IDENTIFICATION="en_US.UTF-8" LC_MEASUREMENT="en_US.UTF-8" LC_MONETARY="en_US.UTF-8" LC_NAME="en_US.UTF-8" LC_NUMERIC="en_US.UTF-8" LC_PAPER="en_US.UTF-8" LC_TELEPHONE="en_US.UTF-8" LC_TIME="en_US.UTF-8" LLVM_DYNAMIC_LIBS_100="/usr/local/libclang-dynlibs-10.0" LLVM_INSTALL_DIR="/usr/local/libclang-15.0.0" LOGNAME="qt" MOTD_SHOWN="pam" MQTT_TEST_BROKER_LOCATION="/opt/paho_broker/interoperability/startbroker.py" OLDPWD="/home/qt" OPENSSL_ANDROID_HOME_DEFAULT="/home/qt/prebuilt-openssl-3.0.7-for-android-ndk-r25b" OPENSSL_ANDROID_HOME_LATEST="/home/qt/prebuilt-openssl-3.0.7-for-android-ndk-r25b" PAPERSIZE="letter" PATH="/opt/cmake-3.24.2/bin:/home/qt/.local/bin:/home/qt/sccache_wrapper:/usr/local/sccache:/opt/node-v18.16.0-linux-x64/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin" QEMUARM64_TOOLCHAIN_CROSS_COMPILE="/opt/b2qt/3.2/sysroots/x86_64-pokysdk-linux/usr/bin/aarch64-poky-linux/aarch64-poky-linux-" QEMUARM64_TOOLCHAIN_ENVSETUP="/opt/b2qt/3.2/environment-setup-cortexa57-poky-linux" QEMUARM64_TOOLCHAIN_FILE="/opt/b2qt/3.2/sysroots/x86_64-pokysdk-linux/usr/share/cmake/OEToolchainConfig.cmake" QEMUARM64_TOOLCHAIN_SYSROOT="/opt/b2qt/3.2/sysroots/cortexa57-poky-linux" QEMUARMV7_TOOLCHAIN_CROSS_COMPILE="/opt/b2qt/3.2/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux-gnueabi/arm-poky-linux-gnueabi-" QEMUARMV7_TOOLCHAIN_ENVSETUP="/opt/b2qt/3.2/environment-setup-armv7vet2hf-neon-poky-linux-gnueabi" QEMUARMV7_TOOLCHAIN_FILE="/opt/b2qt/3.2/sysroots/x86_64-pokysdk-linux/usr/share/cmake/OEToolchainConfig.cmake" QEMUARMV7_TOOLCHAIN_SYSROOT="/opt/b2qt/3.2/sysroots/armv7vet2hf-neon-poky-linux-gnueabi" QEMUMIPS64_TOOLCHAIN_CROSS_COMPILE="/opt/b2qt/3.2/sysroots/x86_64-pokysdk-linux/usr/bin/mips64-poky-linux/mips64-poky-linux-" QEMUMIPS64_TOOLCHAIN_ENVSETUP="/opt/b2qt/3.2/environment-setup-mips64r2-poky-linux" QEMUMIPS64_TOOLCHAIN_FILE="/opt/b2qt/3.2/sysroots/x86_64-pokysdk-linux/usr/share/cmake/OEToolchainConfig.cmake" QEMUMIPS64_TOOLCHAIN_SYSROOT="/opt/b2qt/3.2/sysroots/mips64r2-poky-linux" QEMU_SET_ENV="QT_WAYLAND_DISABLE_WINDOWDECORATION=1" QNX_710="/opt/qnx710" QNX_QEMU="/home/qt/QNX" QNX_QEMU_IPADDR="172.31.1.10" QNX_QEMU_LD_LIBRARY_PATH="/proc/boot:/system/lib:/system/lib/dll:/home/qt/work/install/target/lib" QNX_QEMU_SSH="root@172.31.1.10" SCCACHE_IDLE_TIMEOUT="0" SCCACHE_IGNORE_SERVER_IO_ERROR="1" SCCACHE_LOG="trace" SHELL="/bin/bash" SHLVL="2" SSH_CLIENT="10.9.70.65 50596 22" SSH_CONNECTION="10.9.70.65 50596 10.215.244.133 22" SSH_TTY="/dev/pts/0" TERM="xterm-256color" USER="qt" XDG_DATA_DIRS="/usr/share/gnome:/usr/local/share:/usr/share:/var/lib/snapd/desktop" XDG_RUNTIME_DIR="/run/user/1000" XDG_SESSION_CLASS="user" XDG_SESSION_ID="3" XDG_SESSION_TYPE="tty" _="/usr/local/sccache/sccache" absl_ROOT="/home/qt/install-grpc-1.50.1" gRPC_ROOT="/home/qt/install-grpc-1.50.1" "/usr/bin/g++" "-x" "c++" "-E" "-P" "/home/qt/work/qt/qtbase/src/corelib/kernel/qpointer.cpp" "-I/home/qt/work/qt/qtbase_build/src/corelib/Core_autogen/include" "-I/home/qt/work/qt/qtbase_build/include" "-I/home/qt/work/qt/qtbase_build/include/QtCore" "-I/home/qt/work/qt/qtbase/src/corelib" "-I/home/qt/work/qt/qtbase_build/src/corelib" "-I/home/qt/work/qt/qtbase_build/src/corelib/global" "-I/home/qt/work/qt/qtbase_build/src/corelib/kernel" "-I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/tinycbor/src" "-I/home/qt/work/qt/qtbase_build/include/QtCore/6.7.0" "-I/home/qt/work/qt/qtbase_build/include/QtCore/6.7.0/QtCore" "-I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/double-conversion/double-conversion" "-I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/double-conversion" "-I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/forkfd" "-I/home/qt/work/qt/qtbase_build/src/corelib/.rcc" "-I/home/qt/work/qt/qtbase/mkspecs/linux-g++" "-I/home/qt/work/qt/qtbase/src/3rdparty/pcre2/src" "-isystem" "/usr/include/glib-2.0" "-isystem" "/usr/lib/x86_64-linux-gnu/glib-2.0/include" "-include" "/home/qt/work/qt/qtbase_build/src/corelib/CMakeFiles/Core.dir/cmake_pch.hxx" "-MD" "-MF" "src/corelib/CMakeFiles/Core.dir/kernel/qpointer.cpp.o.d" "-MT" "src/corelib/CMakeFiles/Core.dir/kernel/qpointer.cpp.o" "-DBACKTRACE_HEADER=\"execinfo.h\"" "-DCore_EXPORTS" "-DELF_INTERPRETER=\"/lib64/ld-linux-x86-64.so.2\"" "-DPCRE2_CODE_UNIT_WIDTH=16" "-DQT_ASCII_CAST_WARNINGS" "-DQT_BUILDING_QT" "-DQT_BUILD_CORE_LIB" "-DQT_DEPRECATED_WARNINGS" "-DQT_DISABLE_DEPRECATED_UP_TO=0x050000" "-DQT_EXPLICIT_QFILE_CONSTRUCTION_FROM_PATH" "-DQT_LEAN_HEADERS=1" "-DQT_MOC_COMPAT" "-DQT_NO_AS_CONST" "-DQT_NO_CAST_TO_ASCII" "-DQT_NO_CONTEXTLESS_CONNECT" "-DQT_NO_DEBUG" "-DQT_NO_FOREACH" "-DQT_NO_JAVA_STYLE_ITERATORS" "-DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT" "-DQT_NO_QEXCHANGE" "-DQT_NO_USING_NAMESPACE" "-DQT_TYPESAFE_FLAGS" "-DQT_USE_QSTRINGBUILDER" "-DQT_WARN_DEPRECATED_UP_TO=0x070000" "-D_LARGEFILE64_SOURCE" "-D_LARGEFILE_SOURCE" "-g" "-DNDEBUG" "-O3" "-fPIC" "-fvisibility=hidden" "-fvisibility-inlines-hidden" "-Wall" "-Wextra" "-Wsuggest-override" "-fcf-protection=full" "-std=c++17" "-Winvalid-pch")
[2023-08-01T12:18:44Z TRACE sccache::compiler::gcc] preprocess: Some(cd "/home/qt/work/qt/qtbase_build" && ANDROID_API_VERSION="android-33" ANDROID_EMULATOR_RUNNER="/home/qt/android_emulator_launcher.sh" ANDROID_NDK_HOST="linux-x86_64" ANDROID_NDK_ROOT_DEFAULT="/opt/android/android-ndk-r25b" ANDROID_NDK_ROOT_LATEST="/opt/android/android-ndk-r25b" ANDROID_SDK_ROOT="/opt/android/sdk" BREAKPAD_SOURCE_DIR="/home/qt/breakpad" CONAN_REVISIONS_ENABLED="1" CONAN_V2_MODE="1" DBUS_SESSION_BUS_ADDRESS="unix:path=/run/user/1000/bus" FBXSDK="/opt/fbx" FFMPEG_DIR="/usr/local/FFmpeg-n6.0" HOME="/home/qt" LANG="en_US.UTF-8" LC_ADDRESS="en_US.UTF-8" LC_ALL="en_US.UTF8" LC_IDENTIFICATION="en_US.UTF-8" LC_MEASUREMENT="en_US.UTF-8" LC_MONETARY="en_US.UTF-8" LC_NAME="en_US.UTF-8" LC_NUMERIC="en_US.UTF-8" LC_PAPER="en_US.UTF-8" LC_TELEPHONE="en_US.UTF-8" LC_TIME="en_US.UTF-8" LLVM_DYNAMIC_LIBS_100="/usr/local/libclang-dynlibs-10.0" LLVM_INSTALL_DIR="/usr/local/libclang-15.0.0" LOGNAME="qt" MOTD_SHOWN="pam" MQTT_TEST_BROKER_LOCATION="/opt/paho_broker/interoperability/startbroker.py" OLDPWD="/home/qt" OPENSSL_ANDROID_HOME_DEFAULT="/home/qt/prebuilt-openssl-3.0.7-for-android-ndk-r25b" OPENSSL_ANDROID_HOME_LATEST="/home/qt/prebuilt-openssl-3.0.7-for-android-ndk-r25b" PAPERSIZE="letter" PATH="/opt/cmake-3.24.2/bin:/home/qt/.local/bin:/home/qt/sccache_wrapper:/usr/local/sccache:/opt/node-v18.16.0-linux-x64/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin" QEMUARM64_TOOLCHAIN_CROSS_COMPILE="/opt/b2qt/3.2/sysroots/x86_64-pokysdk-linux/usr/bin/aarch64-poky-linux/aarch64-poky-linux-" QEMUARM64_TOOLCHAIN_ENVSETUP="/opt/b2qt/3.2/environment-setup-cortexa57-poky-linux" QEMUARM64_TOOLCHAIN_FILE="/opt/b2qt/3.2/sysroots/x86_64-pokysdk-linux/usr/share/cmake/OEToolchainConfig.cmake" QEMUARM64_TOOLCHAIN_SYSROOT="/opt/b2qt/3.2/sysroots/cortexa57-poky-linux" QEMUARMV7_TOOLCHAIN_CROSS_COMPILE="/opt/b2qt/3.2/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux-gnueabi/arm-poky-linux-gnueabi-" QEMUARMV7_TOOLCHAIN_ENVSETUP="/opt/b2qt/3.2/environment-setup-armv7vet2hf-neon-poky-linux-gnueabi" QEMUARMV7_TOOLCHAIN_FILE="/opt/b2qt/3.2/sysroots/x86_64-pokysdk-linux/usr/share/cmake/OEToolchainConfig.cmake" QEMUARMV7_TOOLCHAIN_SYSROOT="/opt/b2qt/3.2/sysroots/armv7vet2hf-neon-poky-linux-gnueabi" QEMUMIPS64_TOOLCHAIN_CROSS_COMPILE="/opt/b2qt/3.2/sysroots/x86_64-pokysdk-linux/usr/bin/mips64-poky-linux/mips64-poky-linux-" QEMUMIPS64_TOOLCHAIN_ENVSETUP="/opt/b2qt/3.2/environment-setup-mips64r2-poky-linux" QEMUMIPS64_TOOLCHAIN_FILE="/opt/b2qt/3.2/sysroots/x86_64-pokysdk-linux/usr/share/cmake/OEToolchainConfig.cmake" QEMUMIPS64_TOOLCHAIN_SYSROOT="/opt/b2qt/3.2/sysroots/mips64r2-poky-linux" QEMU_SET_ENV="QT_WAYLAND_DISABLE_WINDOWDECORATION=1" QNX_710="/opt/qnx710" QNX_QEMU="/home/qt/QNX" QNX_QEMU_IPADDR="172.31.1.10" QNX_QEMU_LD_LIBRARY_PATH="/proc/boot:/system/lib:/system/lib/dll:/home/qt/work/install/target/lib" QNX_QEMU_SSH="root@172.31.1.10" SCCACHE_IDLE_TIMEOUT="0" SCCACHE_IGNORE_SERVER_IO_ERROR="1" SCCACHE_LOG="trace" SHELL="/bin/bash" SHLVL="2" SSH_CLIENT="10.9.70.65 50596 22" SSH_CONNECTION="10.9.70.65 50596 10.215.244.133 22" SSH_TTY="/dev/pts/0" TERM="xterm-256color" USER="qt" XDG_DATA_DIRS="/usr/share/gnome:/usr/local/share:/usr/share:/var/lib/snapd/desktop" XDG_RUNTIME_DIR="/run/user/1000" XDG_SESSION_CLASS="user" XDG_SESSION_ID="3" XDG_SESSION_TYPE="tty" _="/usr/local/sccache/sccache" absl_ROOT="/home/qt/install-grpc-1.50.1" gRPC_ROOT="/home/qt/install-grpc-1.50.1" "/usr/bin/g++" "-x" "c++" "-E" "-P" "/home/qt/work/qt/qtbase/src/corelib/kernel/qpointer.cpp" "-I/home/qt/work/qt/qtbase_build/src/corelib/Core_autogen/include" "-I/home/qt/work/qt/qtbase_build/include" "-I/home/qt/work/qt/qtbase_build/include/QtCore" "-I/home/qt/work/qt/qtbase/src/corelib" "-I/home/qt/work/qt/qtbase_build/src/corelib" "-I/home/qt/work/qt/qtbase_build/src/corelib/global" "-I/home/qt/work/qt/qtbase_build/src/corelib/kernel" "-I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/tinycbor/src" "-I/home/qt/work/qt/qtbase_build/include/QtCore/6.7.0" "-I/home/qt/work/qt/qtbase_build/include/QtCore/6.7.0/QtCore" "-I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/double-conversion/double-conversion" "-I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/double-conversion" "-I/home/qt/work/qt/qtbase/src/corelib/../3rdparty/forkfd" "-I/home/qt/work/qt/qtbase_build/src/corelib/.rcc" "-I/home/qt/work/qt/qtbase/mkspecs/linux-g++" "-I/home/qt/work/qt/qtbase/src/3rdparty/pcre2/src" "-isystem" "/usr/include/glib-2.0" "-isystem" "/usr/lib/x86_64-linux-gnu/glib-2.0/include" "-include" "/home/qt/work/qt/qtbase_build/src/corelib/CMakeFiles/Core.dir/cmake_pch.hxx" "-MD" "-MF" "src/corelib/CMakeFiles/Core.dir/kernel/qpointer.cpp.o.d" "-MT" "src/corelib/CMakeFiles/Core.dir/kernel/qpointer.cpp.o" "-DBACKTRACE_HEADER=\"execinfo.h\"" "-DCore_EXPORTS" "-DELF_INTERPRETER=\"/lib64/ld-linux-x86-64.so.2\"" "-DPCRE2_CODE_UNIT_WIDTH=16" "-DQT_ASCII_CAST_WARNINGS" "-DQT_BUILDING_QT" "-DQT_BUILD_CORE_LIB" "-DQT_DEPRECATED_WARNINGS" "-DQT_DISABLE_DEPRECATED_UP_TO=0x050000" "-DQT_EXPLICIT_QFILE_CONSTRUCTION_FROM_PATH" "-DQT_LEAN_HEADERS=1" "-DQT_MOC_COMPAT" "-DQT_NO_AS_CONST" "-DQT_NO_CAST_TO_ASCII" "-DQT_NO_CONTEXTLESS_CONNECT" "-DQT_NO_DEBUG" "-DQT_NO_FOREACH" "-DQT_NO_JAVA_STYLE_ITERATORS" "-DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT" "-DQT_NO_QEXCHANGE" "-DQT_NO_USING_NAMESPACE" "-DQT_TYPESAFE_FLAGS" "-DQT_USE_QSTRINGBUILDER" "-DQT_WARN_DEPRECATED_UP_TO=0x070000" "-D_LARGEFILE64_SOURCE" "-D_LARGEFILE_SOURCE" "-g" "-DNDEBUG" "-O3" "-fPIC" "-fvisibility=hidden" "-fvisibility-inlines-hidden" "-Wall" "-Wextra" "-Wsuggest-override" "-fcf-protection=full" "-std=c++17" "-Winvalid-pch")
[2023-08-01T12:18:44Z TRACE mio::poll] registering event source with poller: token=Token(16777219), interests=READABLE | WRITABLE
[2023-08-01T12:18:44Z TRACE mio::poll] registering event source with poller: token=Token(16777218), interests=READABLE | WRITABLE
[2023-08-01T12:18:45Z TRACE mio::poll] deregistering event source from poller
[2023-08-01T12:18:45Z TRACE mio::poll] deregistering event source from poller
[2023-08-01T12:18:45Z TRACE sccache::util] Hashed 0 files in 0.000 s
[2023-08-01T12:18:45Z TRACE sccache::compiler::c] [qpointer.cpp.o]: Preprocessor output is 3028432 bytes
[2023-08-01T12:18:45Z DEBUG sccache::compiler::compiler] [qpointer.cpp.o]: generate_hash_key took 0.113 s
[2023-08-01T12:18:45Z TRACE sccache::compiler::compiler] [qpointer.cpp.o]: Hash key: 586fe72d0dc68bf36a7995cb57fa05356f76548d750f215589f97c25dc733883
[2023-08-01T12:18:45Z TRACE sccache::cache::disk] DiskCache::get(586fe72d0dc68bf36a7995cb57fa05356f76548d750f215589f97c25dc733883)
[2023-08-01T12:18:45Z DEBUG sccache::compiler::compiler] [qpointer.cpp.o]: Cache hit in 0.002 s

NOTE: The hash key for both is 586fe72d0dc68bf36a7995cb57fa05356f76548d750f215589f97c25dc733883 !!!

My understanding is that both commands compile the same pre-processed source code, but the output format differs.

[Xuanwo]

Interesting. We already included langauge in the hash calculation:

sccache/src/compiler/c.rs

Lines 717 to 750 in 7074753

	pub fn hash_key(
	compiler_digest: &str,
	language: Language,
	arguments: &[OsString],
	extra_hashes: &[String],
	env_vars: &[(OsString, OsString)],
	preprocessor_output: &[u8],
	plusplus: bool,
	) -> String {
	// If you change any of the inputs to the hash, you should change `CACHE_VERSION`.
	let mut m = Digest::new();
	m.update(compiler_digest.as_bytes());
	// clang and clang++ have different behavior despite being byte-for-byte identical binaries, so
	// we have to incorporate that into the hash as well.
	m.update(&[plusplus as u8]);
	m.update(CACHE_VERSION);
	m.update(language.as_str().as_bytes());
	for arg in arguments {
	arg.hash(&mut HashToDigest { digest: &mut m });
	}
	for hash in extra_hashes {
	m.update(hash.as_bytes());
	}
	for &(ref var, ref val) in env_vars.iter() {
	if CACHED_ENV_VARS.contains(var.as_os_str()) {
	var.hash(&mut HashToDigest { digest: &mut m });
	m.update(&b"="[..]);
	val.hash(&mut HashToDigest { digest: &mut m });
	}
	}
	m.update(preprocessor_output);
	m.finish()
	}

[jimis]

Isn't language the input language? Both input files are C++ code. The different is in the output format.

According to my experiments, it's the parameter -x c++-header that makes GCC generate GCH file.

[jimis]

GCC's logic that determines the output format is a bit complicated, and depends on the extension of the main input file and on the -x option. According to GCC docs:

-x language

Specify explicitly the language for the following input files (rather than letting the compiler choose a default based on the file name suffix). This option applies to all following input files until the next -x option.

After experimenting, here is GCC's behaviour, without sccache involved:

• gcc -o blah -c cmake_pch.hxx.cxx generates object code
• gcc -o blah -c cmake_pch.hxx.hxx generates precompiled header file
• gcc -x c++-header -o blah -c whatever_filename_and_extension_you_like generates precompiled header file

I guess Sccache doesn't take -x into consideration?
EDIT: scratch that, apparently it does:

sccache/src/compiler/gcc.rs

Lines 609 to 620 in 7074753

	fn language_to_gcc_arg(lang: Language) -> Option<&'static str> {
	match lang {
	Language::C => Some("c"),
	Language::CHeader => Some("c-header"),
	Language::Cxx => Some("c++"),
	Language::CxxHeader => Some("c++-header"),
	Language::ObjectiveC => Some("objective-c"),
	Language::ObjectiveCxx => Some("objective-c++"),
	Language::Cuda => Some("cu"),
	Language::GenericHeader => None, // Let the compiler decide
	}
	}

[jimis]

Another thing to note is that all the .cpp files that get mis-compiled are empty i.e. contain only comments (class documentation). And the cmake_pch.hxx.cxx file is also empty, contains only a single comment line.

So here my current theory:

1. Sccache, for all command lines, does pre-compilation (-E) first, with output to stdout
2. GCC, for all the offending files, when fed the -E parameter, outputs the same preprocessed source regardless of the -x argument it has on the command line
3. Sccache follows with a "local compile" step, which is kind of opaque. All I can see in the (local) server logs, for both the PCH generation and the object code generation steps, is:

   [2023-08-01T16:20:57Z TRACE sccache::compiler::gcc] compile
   [2023-08-01T16:20:57Z DEBUG sccache::compiler::compiler] [cmake_pch.hxx.gch]: Compiling locally
   

4. The result of "compile" is different based on the -x argument. But sccache stores them under the same hash key.
   • Indeed for each case I cleared the cache and re-run the compilation. The result file was correct. Running the same command with populated cache resulted to a possibly wrong output file, because of the hash collision.

[jimis]

Simplest way to reproduce the issue:

  $ touch empty.c
  $ gcc              -c -o out1 empty.c
  $ gcc  -x c-header -c -o out2 empty.c
  $ file out1 out2
  out1: ELF 64-bit LSB relocatable, x86-64, version 1 (SYSV), not stripped
  out2: GCC precompiled header (version 014) for C

The two files are different. But if we feed these compilations to sccache, they lead to the same result:

  $ sccache gcc              -c -o out3 empty.c
  $ sccache gcc  -x c-header -c -o out4 empty.c
  $ file out3 out4
  out3: ELF 64-bit LSB relocatable, x86-64, version 1 (SYSV), not stripped
  out4: ELF 64-bit LSB relocatable, x86-64, version 1 (SYSV), not stripped

I'm editing the description to avoid misleading people through heaps of debugging info.