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configure: fix broken cross-compilation detection #524

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configure: fix broken cross-compilation detection #524

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10 changes: 10 additions & 0 deletions configure
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Original file line number Diff line number Diff line change
Expand Up @@ -450,6 +450,16 @@ for arg in "$@"; do
esac
done

## Assume the build is native if both $CXX and $CXX_FOR_BUILD have the same value.
# We use the value of $CXX_FOR_BUILD to detect cross-build. However, it is fairly common to set
# both variables to the same compiler in a native build. For example, cbuild (Chimera Linux package
# builder) sets both variables regardless of native or cross build. Also, GNU autotools assumes the
# build is native in this case. Unset $CXX_FOR_BUILD now to be consistent with GNU autotools and
# what people expect.
if [ -n "${CXX_FOR_BUILD:-}" ] && [ "$CXX_FOR_BUILD" = "$CXX" ]; then
unset CXX_FOR_BUILD
fi

## Check platform is specified for a cross-build
if [ -n "${CXX_FOR_BUILD:-}" ]; then
if [ -z "${PLATFORM:-}" ]; then
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