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build system: use version number comparison for -Wshadow-compatible-local test

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clang++ doesn't error out on unknown flags, it only spews
warnings. Therefore AC_TRY_COMPILE is useless for detecting support
for it.
This commit is contained in:
Moritz Bunkus 2018-04-17 23:41:32 +02:00
parent 9eaf235c76
commit c78177e99b
1 changed files with 6 additions and 16 deletions
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22
ac/compiler_flags.m4
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@ -31,29 +31,19 @@ else
WNO_MAYBE_UNINITIALIZED="-Wno-maybe-uninitialized"
FSTACK_PROTECTOR="-fstack-protector"
if check_version 7.0.0 $COMPILER_VERSION ; then
WSHADOW_COMPATIBLE_LOCAL="-Wshadow-compatible-local"
fi
if check_version 4.9.0 $COMPILER_VERSION ; then
FSTACK_PROTECTOR="-fstack-protector-strong"
fi
elif check_version 4.8.0 $COMPILER_VERSION ; then
if check_version 4.8.0 $COMPILER_VERSION ; then
WLOGICAL_OP="-Wlogical-op"
fi
fi
AC_CACHE_CHECK([for compiler flag -Wshadow-compatible-local], [ax_cv_wshadow_compatible_local],[
AC_LANG_PUSH(C++)
CXXFLAGS_SAVED="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS_SAVED -Wshadow-compatible-local"
AC_TRY_COMPILE([], [true;], [ax_cv_wshadow_compatible_local="yes"], [ax_cv_wshadow_compatible_local="no"])
AC_LANG_POP
CXXFLAGS="$CXXFLAGS_SAVED"
])
if test x"$ax_cv_wshadow_compatible_local" = xyes; then
WSHADOW_COMPATIBLE_LOCAL="-Wshadow-compatible-local"
fi
AC_SUBST(FSTACK_PROTECTOR)
AC_SUBST(QUNUSED_ARGUMENTS)
AC_SUBST(WNO_SELF_ASSIGN)