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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 as native if both $CXX and $CXX_FOR_BUILD have the same value.
# If the compiler for the host and the build machine are the same, it's a native build. There is a
# chance that the user may set both $CXX and $CXX_FOR_BUILD to the same compiler. For example,
# cbuild (Chimera Linux package builder) sets both variables regardless of native or cross build
# and because we use $CXX_FOR_BUILD for detecting cross build, we should unset that variable in
# this case. Also, GNU autotools detects this case and assumes the build as native.
if [ -n "${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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