makefile.m32: add support for custom ARCH [ci skip] #9092
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When building curl for target platform other than x64 and x86, it is now possible to pass `ARCH=custom`, that will omit all hardcoded logic for setting up CFLAGS/LDFLAGS/RCFLAGS for these platforms, and let these be customized via `CURL_CFLAG_EXTRAS`, `CURL_LDFLAG_EXTRAS`, and a newly added one for the resource compiler: `CURL_RCFLAG_EXTRAS`. This makes it possible to use `makefile.m32` to build for ARM64 for example.
vszakats
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to curl/curl-for-win
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Jul 3, 2022
Using the excellent llvm-mingw project [1] by @mstorsjo to implement ARM64 support for curl-for-win builds. ARM64 requires UCRT (this will not change) and clang (this may change when GCC toolchains get ready for it.) One small snag is OpenSSL, which doesn't have a native way for ARM64 support with mingw, so we use its `mingw64` mode with `no-asm` as a workaround, which will affect performance. ARM64 builds are not yet enabled in the CI machine. This will happen in future commits. For now this needs downloading llvm-mingw as a binary on each platform and pointing the `CW_LLVM_MINGW_PATH` variable to it. llvm-mingw will only be used for ARM64 targets for now, making versions listed in the manifest a bit confusing. Short of a CPU+VM or real machine to run ARM64 Windows apps, I have no way to tell if the resulting binaries are correct or run at all. But they for sure link cleanly. Applied a pending PR to support ARM64 with Makefile.m32: [2]. Plus an earlier patch to make it apply cleanly [3]. [1] https://github.com/mstorsjo/llvm-mingw [2] curl/curl#9092 [3] curl/curl@c7f53b7
vszakats
added a commit
to curl/curl-for-win
that referenced
this pull request
Jul 4, 2022
Test build with binaries here: [0] Using the excellent llvm-mingw project [1] by @mstorsjo to implement ARM64 support for curl-for-win builds. ARM64 requires UCRT (this will not change) and clang (this may change when GCC toolchains get ready for it.) llvm-mingw is automatically downloaded, installed and used if `CW_DL_LLVM_MINGW` is set. Existing llvm-mingw is used if envvar `CW_LLVM_MINGW_PATH` is pointing to its directory. llvm-mingw is only used for ARM64 targets for now. To make versions listed in the global manifest `build.txt` less confusing, ARM64 tools are marked as such. One small snag is OpenSSL, which doesn't have a native way for ARM64 support with mingw, so we use a slightly modified `mingw64` mode with `no-asm` as a workaround, which affects performance. LibreSSL builds fine out of the box. Short of a CPU+VM or real machine to run ARM64 Windows apps, I have no way to tell if the resulting binaries are correct or run at all. But, they link cleanly. I also have not tested a build on Windows, only on Linux and macOS. ARM64 builds are now enabled for CI builds. One potential problem is builds taking very long now. With x64+x86 using Makefile.m32, a typical time was 25-30 minutes. With x64+x86+a64 using CMake, it's 50 minutes, which may hit CI limits. Can be mitigated by switching back to faster Makefile.m32 builds from CMake for curl. Applied a pending PR to support ARM64 with Makefile.m32: [2]. Plus an earlier patch to make that apply cleanly [3]. [0] https://ci.appveyor.com/project/curlorg/curl-for-win/builds/44062838 [1] https://github.com/mstorsjo/llvm-mingw [2] curl/curl#9092 [3] curl/curl@c7f53b7
bagder
approved these changes
Jul 4, 2022
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When building curl for target platform other than x64 and x86, it is now
possible to pass
ARCH=custom, that will omit all hardcoded logic forsetting up CFLAGS/LDFLAGS/RCFLAGS for these platforms, and let these be
customized via
CURL_CFLAG_EXTRAS,CURL_LDFLAG_EXTRAS, and a newlyadded one for the resource compiler:
CURL_RCFLAG_EXTRAS.This makes it possible to use
makefile.m32to build for ARM64 forexample.