# expose required -std option via pkg-config
PKG_CXXFLAGS=$STD
+# See if -Wunknown-warning-option is supported
+AC_MSG_CHECKING(
+ [whether -Wunknown-warning-option is supported])
+AC_CACHE_VAL([folly_cv_cxx_unknown_warning_option_support], [
+ folly_save_CXXFLAGS="$CXXFLAGS"
+ CXXFLAGS="$CXXFLAGS -Werror=unknown-warning-option"
+ AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM([[]], [[]])],
+ [
+ # The compiler didn't completely error out on -Werror=unknown-warning-option
+ CXXFLAGS="$CXXFLAGS -Werror=unknown-warning-option -Wthis-is-an-unknown-option-that-should-error"
+ AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM([[]], [[]])],
+ [folly_cv_cxx_unknown_warning_option_support=no],
+ [folly_cv_cxx_unknown_warning_option_support=yes])
+ ],
+ [folly_cv_cxx_unknown_warning_option_support=no])
+ CXXFLAGS="$folly_save_CXXFLAGS"])
+AC_MSG_RESULT([$folly_cv_cxx_unknown_warning_option_support])
+
# See if -Wshadow-local and -Wshadow-compatible-local are supported
AC_MSG_CHECKING(
[whether -Wshadow-local and -Wshadow-compatible-local are supported])
AC_CACHE_VAL([folly_cv_cxx_shadow_local_support], [
folly_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -Wshadow-local -Wshadow-compatible-local"
+ if test "$folly_cv_cxx_unknown_warning_option_support" = yes; then
+ CXXFLAGS="$CXXFLAGS -Werror=unknown-warning-option"
+ fi
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[]], [[]])],
[folly_cv_cxx_shadow_local_support=yes],
[Define to 1 if the compiler has VLA (variable-length array) support,
otherwise define to 0])
+AC_CACHE_CHECK(
+ [for variable template support],
+ [folly_cv_prog_cc_have_variable_templates],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_SOURCE[
+ template <class> constexpr bool g = true;
+ int main() {}
+ ]],
+ [folly_cv_prog_cc_have_variable_templates=yes],
+ [folly_cv_prog_cc_have_variable_templates=no])])
+
+AM_CONDITIONAL(
+ [HAVE_VARIABLE_TEMPLATES],
+ [test "x${folly_cv_prog_cc_have_variable_templates}" = "xyes"],
+ [Define to 1 if the compiler supports variable templates])
+
# Checks for library functions.
AC_CHECK_FUNCS([malloc_size \
malloc_usable_size \
# Output
AC_CONFIG_FILES([Makefile
+ chrono/test/Makefile
io/test/Makefile
libfolly.pc
test/Makefile