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depends: For mingw cross compile use -gcc-posix to prevent library conflict

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CMake parses some paths from the spec of the C compiler, assuming it
will be the linker, resulting in the link to end up with
`-L/usr/lib/gcc/x86_64-w64-mingw32/12-win32` on debian bookworm if both
-win32 and -posix variants are installed, and -win32 is the default
alternative.

This results in the wrong C++ library being linked, missing
std::threads::hardware_concurrency and other threading functions.

To fix this, use the -posix variant of gcc as well when available. This
fixes a regression compared to autotools, where this scenario worked.

Github-Pull: #31013
Rebased-From: ae56b3230b
This commit is contained in:
laanwj 2024-10-01 19:04:24 +02:00 • committed by fanquake
parent f998ac6286
commit 7fec638222
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3
depends/hosts/mingw32.mk
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@ -1,3 +1,6 @@
ifneq ($(shell $(SHELL) $(.SHELLFLAGS) "command -v $(host)-gcc-posix"),)
mingw32_CC := $(host)-gcc-posix
endif
ifneq ($(shell $(SHELL) $(.SHELLFLAGS) "command -v $(host)-g++-posix"),)
mingw32_CXX := $(host)-g++-posix
endif