diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index add4a6bbd8c8..1147e4dddf37 100644 --- a/configure.ac +++ b/configure.ac @@ -5668,6 +5668,34 @@ if test "$GCC" = "yes"; then AC_MSG_RESULT([yes]) ], [AC_MSG_RESULT([no])]) AC_LANG_POP([C++]) + + AC_MSG_CHECKING([whether $CXX supports __attribute__((warn_unused))]) + AC_LANG_PUSH([C++]) + save_CXXFLAGS=$CXXFLAGS + CXXFLAGS="$CFLAGS -Werror -Wunknown-pragmas" + AC_COMPILE_IFELSE([AC_LANG_SOURCE([ + struct __attribute__((warn_unused)) dummy {}; + ])], [ + AC_DEFINE([HAVE_GCC_ATTRIBUTE_WARN_UNUSED],[1]) + AC_MSG_RESULT([yes]) + ], [AC_MSG_RESULT([no])]) + CXXFLAGS=$save_CXXFLAGS + AC_LANG_POP([C++]) + + AC_MSG_CHECKING([whether STL uses __attribute__((warn_unused))]) + AC_LANG_PUSH([C++]) + save_CXXFLAGS=$CXXFLAGS + CXXFLAGS="$CFLAGS -Werror -Wunused" + AC_COMPILE_IFELSE([AC_LANG_SOURCE([ + #include <string> + void f() { std::string s; } + ])], [ + AC_MSG_RESULT([no]) + ], [ + AC_DEFINE([HAVE_GCC_ATTRIBUTE_WARN_UNUSED_STL],[1]) + AC_MSG_RESULT([yes])]) + CXXFLAGS=$save_CXXFLAGS + AC_LANG_POP([C++]) fi AC_SUBST(HAVE_GCC_NO_LONG_DOUBLE) |