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This was used in old LLVM versions. Recent LLVM versions all emit either `__main_void` or `__main_argv_argc`, so we can use those directly.
sbc100
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May 31, 2022
john-sharratt
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Mar 6, 2023
* Remove support for `__original_main`. This was used in old LLVM versions. Recent LLVM versions all emit either `__main_void` or `__main_argv_argc`, so we can use those directly. * Update the CI to use LLVM 14.0.0.
alexcrichton
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Nov 21, 2025
This commit migrates wasi-libc's build system from a `make`-based system to CMake. This is a complete rewrite of the build system which culminates in the deletion of the current `Makefile` and a few supporting scripts and files. The rationale/reasons for this are similar to WebAssembly/wasi-sdk#429, namely: * Building a correct and robust build system in `make` is not easy. There are many times I've found myself in a situation where I need to blow away the entire build directory between builds. Much of the this this bottoms out in subtle behavior like "this file was renamed, but didn't get deleted in the archive" or subtle things like that. CMake is responsible for handling these by default and, in general, is probably going to be more correct than what we write. * Out-of-tree builds are now supported. * Customizing CFLAGS is now supported via standard mechanisms. Previously `EXTRA_CFLAGS` was required since using `CFLAGS` could break the build. * It's easier to move more logic into CMake, such as downloading compiler-rt, than it is to codify it all in makefiles. * Platform portability is generally easier in CMake than make. Building on Windows shouldn't require a full GNU-like environment, for example. * Tests now properly rebuild themselves when wasi-libc changes. * It's easier to customize high-level options, like "enable SIMD", in CMake than it is in Makefiles. This can be documented as a single option to pass where that option affects the build, flags, etc. Personally I'm not a fan of CMake, but I'm more of a fan of it than Makefiles, hence my desire to switch. I want to make this repository easier to build, configure, and change over time. This will also make it easier to integrate this all into wasi-sdk where everything is CMake-based over there as well. I am not a CMake expert, nor am I necessarily an expert in the previous Makefiles. I've done my best here, but I'm happy to change things if someone who knows more about CMake than I (which is a lot of folks) recommends doing so. I'm also happy to adjust the libc build as desired too. Closes WebAssembly#46 Closes WebAssembly#156 Closes WebAssembly#295 Closes WebAssembly#322 Closes WebAssembly#330 Closes WebAssembly#514 Closes WebAssembly#605
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This was used in old LLVM versions. Recent LLVM versions all emit either
__main_voidor__main_argv_argc, so we can use those directly.