+ AS_IF([test "x$ac_cv_vcs_checkout" = xyes],
+ [_APPEND_COMPILE_FLAGS_ERROR([-fstack-check])
+# _APPEND_COMPILE_FLAGS_ERROR([--coverage])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wpragmas])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wunknown-pragmas])],
+ [_APPEND_COMPILE_FLAGS_ERROR([-Wno-unknown-pragmas])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wno-pragmas])])
+
+ AS_IF([test "$CXX" = "clang++"],[_APPEND_COMPILE_FLAGS_ERROR([-Qunused-arguments])])
+
+ _APPEND_COMPILE_FLAGS_ERROR([-Wall])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wextra])
+ _APPEND_COMPILE_FLAGS_ERROR([-Weverything])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wthis-test-should-fail])
+# Anything below this comment please keep sorted.
+# _APPEND_COMPILE_FLAGS_ERROR([-Wmissing-format-attribute])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wno-attributes])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wvarargs])
+ _APPEND_COMPILE_FLAGS_ERROR([-Waddress])
+ _APPEND_COMPILE_FLAGS_ERROR([-Warray-bounds])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wchar-subscripts])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wcomment])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wctor-dtor-privacy])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wfloat-equal])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wformat=2])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wformat-y2k])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wmaybe-uninitialized])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wmissing-field-initializers])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wlogical-op])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wnon-virtual-dtor])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wnormalized=id])
+ _APPEND_COMPILE_FLAGS_ERROR([-Woverloaded-virtual])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wpointer-arith])
+ AS_IF([test "x$MINGW" = xyes],
+ [_APPEND_COMPILE_FLAGS_ERROR([-Wno-suggest-attribute=const])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wno-missing-noreturn])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wmissing-noreturn])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wno-suggest-attribute=noreturn])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wno-error=suggest-attribute=noreturn])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wno-redundant-decls])],
+ [_APPEND_COMPILE_FLAGS_ERROR([-Wredundant-decls])])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wshadow])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wshorten-64-to-32])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wsign-compare])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wstrict-overflow=1])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wswitch-enum])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wtrampolines])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wundef])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wunsafe-loop-optimizations])
+ _APPEND_COMPILE_FLAGS_ERROR([-funsafe-loop-optimizations])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wc++11-compat])
+# _APPEND_COMPILE_FLAGS_ERROR([-Weffc++])
+# _APPEND_COMPILE_FLAGS_ERROR([-Wold-style-cast])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wclobbered])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wunused])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wunused-result])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wunused-variable])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wunused-parameter])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wunused-local-typedefs])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wwrite-strings])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wformat-security])
+ _APPEND_COMPILE_FLAGS_ERROR([-fwrapv])
+ _APPEND_COMPILE_FLAGS_ERROR([-fmudflapt])
+ _APPEND_COMPILE_FLAGS_ERROR([-pipe])
+ _APPEND_COMPILE_FLAGS_ERROR([-fPIE -pie])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wsizeof-pointer-memaccess])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wpacked])
+# _APPEND_COMPILE_FLAGS_ERROR([-Wlong-long])
+# GCC 4.5 removed this.
+# _APPEND_COMPILE_FLAGS_ERROR([-Wunreachable-code])
+
+ AS_IF([test "x$ax_enable_debug" = xno],
+ [AS_IF([test "x$ac_cv_vcs_checkout" = xyes],
+ [AS_IF([test "x${host_os}" != "xmingw"],
+ [AS_IF([test "x$ac_c_gcc_recent" = xyes],
+ [_APPEND_COMPILE_FLAGS_ERROR([-D_FORTIFY_SOURCE=2])
+ #_APPEND_COMPILE_FLAGS_ERROR([-Wstack-protector])
+ #_APPEND_COMPILE_FLAGS_ERROR([-fstack-protector --param=ssp-buffer-size=4])
+ _APPEND_COMPILE_FLAGS_ERROR([-fstack-protector-all])
+ ])])])])
+
+ _SET_SANITIZE_FLAGS
+
+ AS_IF([test "x$ac_cv_warnings_as_errors" = xyes],
+ [AX_APPEND_FLAG([-Werror])])
+ AC_LANG_POP([C++])
+ ])
+
+# All of the heavy lifting happens in _HARDEN_LINKER_FLAGS,
+# _HARDEN_CC_COMPILER_FLAGS, _HARDEN_CXX_COMPILER_FLAGS
+ AC_DEFUN([AX_HARDEN_COMPILER_FLAGS],
+ [AC_PREREQ([2.63])dnl
+ AC_REQUIRE([AC_CANONICAL_HOST])
+ AC_REQUIRE([AX_COMPILER_VERSION])
+ AC_REQUIRE([AX_ASSERT])
+ _WARNINGS_AS_ERRORS
+ _AX_HARDEN_SANITIZE
+
+ AC_REQUIRE([gl_VISIBILITY])
+ AS_IF([test -n "$CFLAG_VISIBILITY"],[CPPFLAGS="$CPPFLAGS $CFLAG_VISIBILITY"])
+
+ _WARNINGS_AS_ERRORS
+ _HARDEN_LINKER_FLAGS
+ _HARDEN_CC_COMPILER_FLAGS
+ _HARDEN_CXX_COMPILER_FLAGS
+ ])