+# _APPEND_COMPILE_FLAGS_ERROR([-std=c++11]) -- Not ready yet
+# _APPEND_COMPILE_FLAGS_ERROR([-pedantic]) --
+# ? _APPEND_COMPILE_FLAGS_ERROR([-Wlong-long]) -- Don't turn on for
+# compatibility issues memcached_stat_st
+
+#serial 9
+
+AC_DEFUN([_WARNINGS_AS_ERRORS],
+ [AC_CACHE_CHECK([if all warnings into errors],[ac_cv_warnings_as_errors],
+ [AS_IF([test "x$ac_cv_vcs_checkout" = xyes],[ac_cv_warnings_as_errors=yes],
+ [ac_cv_warnings_as_errors=no])
+ ])
+ ])
+
+# Note: Should this be LIBS or LDFLAGS?
+AC_DEFUN([_APPEND_LINK_FLAGS_ERROR],
+ [AC_REQUIRE([AX_APPEND_LINK_FLAGS])
+ AX_APPEND_LINK_FLAGS([$1],[LDFLAGS],[-Werror])
+ ])
+
+AC_DEFUN([_APPEND_COMPILE_FLAGS_ERROR],
+ [AC_REQUIRE([AX_APPEND_COMPILE_FLAGS])
+ AX_APPEND_COMPILE_FLAGS([$1],,[-Werror])
+ ])
+
+# Everything above this does the heavy lifting, while what follows does the specifics.
+
+AC_DEFUN([_HARDEN_LINKER_FLAGS],
+ [
+ AS_IF([test "$CC" != "clang"],
+ [_APPEND_LINK_FLAGS_ERROR([-z relro -z now])
+#_APPEND_LINK_FLAGS_ERROR([-pie])
+ AS_IF([test "x$ac_cv_warnings_as_errors" = xyes],
+ [AX_APPEND_LINK_FLAGS([-Werror])])])
+ ])
+
+AC_DEFUN([_HARDEN_CC_COMPILER_FLAGS],
+ [AC_LANG_PUSH([C])dnl
+
+ AS_IF([test "x$ax_enable_debug" = xyes],
+ [CFLAGS=''
+ _APPEND_COMPILE_FLAGS_ERROR([-H])
+ _APPEND_COMPILE_FLAGS_ERROR([-ggdb])
+ _APPEND_COMPILE_FLAGS_ERROR([-g])
+ _APPEND_COMPILE_FLAGS_ERROR([-O0]),
+ _APPEND_COMPILE_FLAGS_ERROR([-fno-omit-frame-pointer])
+ ],[
+ _APPEND_COMPILE_FLAGS_ERROR([-g])
+ _APPEND_COMPILE_FLAGS_ERROR([-O2])
+ ])
+
+ AS_IF([test "x$ac_cv_vcs_checkout" = xyes],
+ [_APPEND_COMPILE_FLAGS_ERROR([-fstack-check])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wpragmas])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wunknown-pragmas])],
+ [_APPEND_COMPILE_FLAGS_ERROR([-Wno-unknown-pragmas])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wno-pragmas])])
+
+ AS_IF([test "$CC" = "clang"],
+ [_APPEND_COMPILE_FLAGS_ERROR([-Qunused-arguments])])
+
+ _APPEND_COMPILE_FLAGS_ERROR([-Wall])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wextra])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wthis-test-should-fail])
+ _APPEND_COMPILE_FLAGS_ERROR([-std=c99])
+# Anything below this comment please keep sorted.
+# _APPEND_COMPILE_FLAGS_ERROR([-Wmissing-format-attribute])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wunsuffixed-float-constants])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wjump-misses-init])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wno-attributes])
+ _APPEND_COMPILE_FLAGS_ERROR([-Waddress])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wvarargs])
+ _APPEND_COMPILE_FLAGS_ERROR([-Warray-bounds])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wbad-function-cast])
+# Not in use -Wc++-compat
+ _APPEND_COMPILE_FLAGS_ERROR([-Wchar-subscripts])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wcomment])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wfloat-equal])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wformat-security])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wformat=2])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wformat-y2k])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wlogical-op])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wmaybe-uninitialized])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wmissing-field-initializers])
+ AS_IF([test "x$MINGW" = xyes],
+ [_APPEND_COMPILE_FLAGS_ERROR([-Wno-missing-noreturn])],
+ [_APPEND_COMPILE_FLAGS_ERROR([-Wmissing-noreturn])])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wmissing-prototypes])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wnested-externs])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wnormalized=id])
+ _APPEND_COMPILE_FLAGS_ERROR([-Woverride-init])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wpointer-arith])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wpointer-sign])
+ AS_IF([test "x$MINGW" = xyes],
+ [_APPEND_COMPILE_FLAGS_ERROR([-Wno-suggest-attribute=const])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wno-suggest-attribute=noreturn])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wno-suggest-attribute=pure])
+ _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([-Wstrict-prototypes])
+ _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])
+ AS_IF([test "x$ac_cv_vcs_checkout" = xyes],[
+ _APPEND_COMPILE_FLAGS_ERROR([-fno-omit-frame-pointer])
+ _APPEND_COMPILE_FLAGS_ERROR([-fsanitize=address])
+ _APPEND_COMPILE_FLAGS_ERROR([-fsanitize=integer])
+ AS_IF([test "x$enable_shared" = "xyes"],[
+ _APPEND_COMPILE_FLAGS_ERROR([-fsanitize=thread])
+ ])
+ _APPEND_COMPILE_FLAGS_ERROR([-fsanitize=memory])
+ _APPEND_COMPILE_FLAGS_ERROR([-fsanitize=alignment])
+ _APPEND_COMPILE_FLAGS_ERROR([-fsanitize=bool])
+ _APPEND_COMPILE_FLAGS_ERROR([-fsanitize=bounds])
+ _APPEND_COMPILE_FLAGS_ERROR([-fsanitize=enum])
+ _APPEND_COMPILE_FLAGS_ERROR([-fsanitize=float-cast-overflow])
+ _APPEND_COMPILE_FLAGS_ERROR([-fsanitize=float-divide-by-zero])
+ _APPEND_COMPILE_FLAGS_ERROR([-fsanitize=integer-divide-by-zero])
+ _APPEND_COMPILE_FLAGS_ERROR([-fsanitize=null])
+ _APPEND_COMPILE_FLAGS_ERROR([-fsanitize=object-size])
+ _APPEND_COMPILE_FLAGS_ERROR([-fsanitize=return])
+ _APPEND_COMPILE_FLAGS_ERROR([-fsanitize=shift])
+ _APPEND_COMPILE_FLAGS_ERROR([-fsanitize=signed-integer-overflow])
+ _APPEND_COMPILE_FLAGS_ERROR([-fsanitize=unreachable])
+ _APPEND_COMPILE_FLAGS_ERROR([-fsanitize=unsigned-integer-overflow])
+ _APPEND_COMPILE_FLAGS_ERROR([-fsanitize=vla-bound])
+ _APPEND_COMPILE_FLAGS_ERROR([-fsanitize=vptr])