mkvtoolnix/ac/compiler_flags.m4
Moritz Bunkus 2fcc79b00c build system: check for and turn off some new warnings from clang++ 3.6
These warnings include -Winconsistent-missing-override and
-Wpotentially-evaluated-expression which are both triggered by code out
of my control (Qt and wxWidgets).
2015-03-25 17:51:30 +01:00

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QUNUSED_ARGUMENTS=""
WNO_SELF_ASSIGN=""
WNO_MISMATCHED_TAGS=""
WLOGICAL_OP=""
if test x"$ac_cv_compiler_is_clang" = xyes; then
QUNUSED_ARGUMENTS="-Qunused-arguments"
WNO_SELF_ASSIGN="-Wno-self-assign"
WNO_MISMATCHED_TAGS="-Wno-mismatched-tags"
ac_save_CXXFLAGS="$CXXFLAGS"
AC_LANG_PUSH(C++)
CXXFLAGS="$ac_save_CXXFLAGS -Werror -Wno-inconsistent-missing-override"
AC_TRY_COMPILE([],[],[ WNO_INCONSISTENT_MISSING_OVERRIDE="-Wno-inconsistent-missing-override" ],[])
CXXFLAGS="$ac_save_CXXFLAGS -Werror -Wno-potentially-evaluated-expression"
AC_TRY_COMPILE([],[],[ WNO_POTENTIALLY_EVALUATED_EXPRESSION="-Wno-potentially-evaluated-expression" ],[])
AC_LANG_POP()
CXXFLAGS="$ac_save_CXXFLAGS"
elif check_version 4.8.0 $ac_cv_gcc_version ; then
WLOGICAL_OP="-Wlogical-op"
fi
AC_SUBST(QUNUSED_ARGUMENTS)
AC_SUBST(WNO_SELF_ASSIGN)
AC_SUBST(WNO_MISMATCHED_TAGS)
AC_SUBST(WLOGICAL_OP)
AC_SUBST(WNO_INCONSISTENT_MISSING_OVERRIDE)
AC_SUBST(WNO_POTENTIALLY_EVALUATED_EXPRESSION)