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configure: Use MSYSTEM_CARCH for default arch on msys2

Browse source 
On msys2, `uname -m` returns the architecture of the base msys2
layer. On Windows on arm64, the base msys2 layer itself is still
x86_64 only, even if running with e.g. the clangarm64 where the
windows native applications are built as aarch64.

If MSYSTEM_CARCH is set, use this instead of `uname -m` for
the default architecture. This gives the correct behaviour
for the clangarm64 environments. It also gives the correct
default for the 32 bit x86 environments such as `mingw32`.

(On `mingw32`, the fact that `uname -m` returned `x86_64`
hasn't been an issue, as both that and `i686` gets normalized
into `x86` internally in ffmpeg's configure.)

Signed-off-by: Coia Prant <coiaprant@gmail.com>
Signed-off-by: Martin Storsjö <martin@martin.st>
(cherry picked from commit df967d095a)
This commit is contained in:
Coia Prant 2025-05-23 17:32:00 +08:00 • committed by Martin Storsjö
parent 4c78a357d0
commit 9373b442a6
1 changed files with 2 additions and 0 deletions
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2
configure vendored
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@ -4112,6 +4112,8 @@ if test "$target_os_default" = aix; then
arch_default=$(uname -p)
strip_default="strip -X32_64"
nm_default="nm -g -X32_64"
elif test "$MSYSTEM_CARCH" != ""; then
arch_default="$MSYSTEM_CARCH"
else
arch_default=$(uname -m)
fi