msys2: Recommend correct cmake package #59001
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msys2 ships 2 different cmake packages, one built natively (with mingw prefix in the package name) and one built against the posix emulation environment. The posix emulation one does not work because it will detect unix-style paths, which it then writes into files that native tools process. Unlike during command invocation (where the msys2 runtime library does path translation), when paths are written to files, they are written verbatim. The practical result of this is that e.g. the LLVM build will fail with a mysterious libz link failure (as e.g. reported in #54981). This is our fault, because our built instructions tell the user to install the wrong one. Fix all that by 1. Correcting the build instructions to install the correct cmake 2. Detecting if the wrong cmake is installed and advising the correct one 3. Fixing an issue where the native CMake did not like our CMAKE_C_COMPILER setting. With all this, CMake runs correctly under msys2 with USE_BINARYBUILDER_LLVM=0.
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Welp, our buildbots have the wrong cmake (unsurprisingly). I guess I'll change the check to only fire when we actually call cmake, but we should also fix the buildbots. |
Keno
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staticfloat
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msys2 ships 2 different cmake packages, one built natively (with mingw prefix in the package name) and one built against the posix emulation environment. The posix emulation one does not work because it will detect unix-style paths, which it then writes into files that native tools process. Unlike during command invocation (where the msys2 runtime library does path translation), when paths are written to files, they are written verbatim.
The practical result of this is that e.g. the LLVM build will fail with a mysterious libz link failure (as e.g. reported in #54981).
This is our fault, because our built instructions tell the user to install the wrong one.
Fix all that by
With all this, CMake runs correctly under msys2 with USE_BINARYBUILDER_LLVM=0.