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macOS: Prevent Xcode 9.3 build warnings 

This PR solves #12867 (needs to run autogen.sh && ./configure)

clang (Apple LLVM version 9.1.0 (clang-902.0.39.1)) warns unused
argument '-pie' during compilation.
So we check for warnings in the test using $CXXFLAG_WERROR.

Windows is alse default-pie and was special-cased because it also
warned, but we can also eliminate that case if warnings are caught.
This commit is contained in:
Akio Nakamura 2018-04-05 18:41:46 +09:00
parent 8480d41e0f
commit 2eb5036c33
1 changed files with 1 additions and 5 deletions
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6
configure.ac
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@ -630,11 +630,7 @@ if test x$use_hardening != xno; then
AX_CHECK_LINK_FLAG([[-Wl,--high-entropy-va]], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -Wl,--high-entropy-va"])
AX_CHECK_LINK_FLAG([[-Wl,-z,relro]], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -Wl,-z,relro"])
AX_CHECK_LINK_FLAG([[-Wl,-z,now]], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -Wl,-z,now"])
if test x$TARGET_OS != xwindows; then
AX_CHECK_COMPILE_FLAG([-fPIE],[PIE_FLAGS="-fPIE"])
AX_CHECK_LINK_FLAG([[-pie]], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -pie"])
fi
AX_CHECK_LINK_FLAG([[-fPIE -pie]], [PIE_FLAGS="-fPIE"; HARDENED_LDFLAGS="$HARDENED_LDFLAGS -pie"],, [[$CXXFLAG_WERROR]])
case $host in
*mingw*)