+# The Following flags are not checked for
+# -Wdeclaration-after-statement is counter to C99
+# _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 7
+
+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])
+ ])
+ ])
+
+AC_DEFUN([_APPEND_LINK_FLAGS_ERROR],
+ [AC_REQUIRE([AX_APPEND_LINK_FLAGS])
+ AX_APPEND_LINK_FLAGS([$1],[LIB],[-Werror])
+ ])
+
+AC_DEFUN([_APPEND_COMPILE_FLAGS_ERROR],
+ [AC_REQUIRE([AX_APPEND_COMPILE_FLAGS])
+ AX_APPEND_COMPILE_FLAGS([$1],,[-Werror])
+ ])
+
+# Everything above this does the heavy lifting, while what follows does the specifics.
+
+AC_DEFUN([_HARDEN_LINKER_FLAGS],
+ [_APPEND_LINK_FLAGS_ERROR([-z relro -z now])
+ _APPEND_LINK_FLAGS_ERROR([-pie])
+ AS_IF([test "x$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$ax_enable_debug" = xyes],
+ [CFLAGS=''
+ _APPEND_COMPILE_FLAGS_ERROR([-ggdb])
+ _APPEND_COMPILE_FLAGS_ERROR([-g])
+ _APPEND_COMPILE_FLAGS_ERROR([-O0])],
+ [_APPEND_COMPILE_FLAGS_ERROR([-g])
+ _APPEND_COMPILE_FLAGS_ERROR([-O2])])
+
+ _APPEND_COMPILE_FLAGS_ERROR([-Wno-pragmas])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wall])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wextra])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wunknown-pragmas])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wthis-test-should-fail])
+ _APPEND_COMPILE_FLAGS_ERROR([-std=c99])
+# Anything below this comment please keep sorted.
+ _APPEND_COMPILE_FLAGS_ERROR([--param=ssp-buffer-size=1])
+# _APPEND_COMPILE_FLAGS_ERROR([-Wmissing-format-attribute])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wno-attributes])
+ _APPEND_COMPILE_FLAGS_ERROR([-Waddress])
+ _APPEND_COMPILE_FLAGS_ERROR([-Warray-bounds])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wbad-function-cast])
+# Not in use -Wc++-compat
+ _APPEND_COMPILE_FLAGS_ERROR([-Wchar-subscripts])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wcomment])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wfloat-equal])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wformat-security])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wformat=2])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wlogical-op])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wmaybe-uninitialized])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wmissing-field-initializers])
+ AS_IF([test "x$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([-Wold-style-definition])
+ _APPEND_COMPILE_FLAGS_ERROR([-Woverride-init])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wpointer-arith])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wpointer-sign])
+ AS_IF([test "x$MINGW" = xyes],
+ [_APPEND_COMPILE_FLAGS_ERROR([-Wno-suggest-attribute=const])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wno-suggest-attribute=noreturn])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wno-suggest-attribute=pure])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wno-redundant-decls])],
+ [_APPEND_COMPILE_FLAGS_ERROR([-Wredundant-decls])])
+
+ _APPEND_COMPILE_FLAGS_ERROR([-Wshadow])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wshorten-64-to-32])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wsign-compare])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wstrict-overflow=1])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wstrict-prototypes])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wswitch-enum])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wundef])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wunused])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wunused-result])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wunused-variable])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wwrite-strings])
+ _APPEND_COMPILE_FLAGS_ERROR([-floop-parallelize-all])
+ _APPEND_COMPILE_FLAGS_ERROR([-fwrapv])
+ _APPEND_COMPILE_FLAGS_ERROR([-fmudflapt])
+ _APPEND_COMPILE_FLAGS_ERROR([-pipe])
+
+ AS_IF([test "x$ax_enable_debug" = xno],
+ [AS_IF([test "x$ac_cv_vcs_checkout" = xyes],
+ [_APPEND_COMPILE_FLAGS_ERROR([-fstack-check])
+ AS_IF([test "x$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])
+# _APPEND_COMPILE_FLAGS_ERROR([-fstack-protector-all])
+ ])])])
+
+ AS_IF([test "x$ac_cv_vcs_checkout" = xyes],
+ [_APPEND_COMPILE_FLAGS_ERROR([-fstack-check])],
+ [_APPEND_COMPILE_FLAGS_ERROR([-Wno-pragmas])])
+
+ AS_IF([test "x$ac_cv_warnings_as_errors" = xyes],
+ [AX_APPEND_FLAG([-Werror])])
+
+ AC_LANG_POP([C])
+ ])
+
+AC_DEFUN([_HARDEN_CXX_COMPILER_FLAGS],
+ [AC_LANG_PUSH([C++])
+ AC_REQUIRE([_APPEND_COMPILE_FLAGS_ERROR])
+
+ AS_IF([test "x$ax_enable_debug" = xyes],
+ [CXXFLAGS=''
+ _APPEND_COMPILE_FLAGS_ERROR([-ggdb])
+ _APPEND_COMPILE_FLAGS_ERROR([-g])
+ _APPEND_COMPILE_FLAGS_ERROR([-O0])],
+ [_APPEND_COMPILE_FLAGS_ERROR([-g])
+ _APPEND_COMPILE_FLAGS_ERROR([-O2])])
+
+ AS_IF([test "x$ac_cv_vcs_checkout" = xyes],
+ [_APPEND_COMPILE_FLAGS_ERROR([-fstack-check])],
+ [_APPEND_COMPILE_FLAGS_ERROR([-Wno-pragmas])])
+
+ _APPEND_COMPILE_FLAGS_ERROR([-Wall])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wextra])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wunknown-pragmas])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wthis-test-should-fail])
+# Anything below this comment please keep sorted.
+ _APPEND_COMPILE_FLAGS_ERROR([--param=ssp-buffer-size=1])
+# _APPEND_COMPILE_FLAGS_ERROR([-Wmissing-format-attribute])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wno-attributes])
+ _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([-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$MINGW" = xyes],
+ [_APPEND_COMPILE_FLAGS_ERROR([-Wno-suggest-attribute=const])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wno-missing-noreturn])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wmissing-noreturn])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wno-suggest-attribute=noreturn])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wno-error=suggest-attribute=noreturn])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wno-redundant-decls])],
+ [_APPEND_COMPILE_FLAGS_ERROR([-Wredundant-decls])])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wshadow])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wshorten-64-to-32])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wsign-compare])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wstrict-overflow=1])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wswitch-enum])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wundef])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wc++11-compat])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wunused])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wunused-result])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wunused-variable])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wwrite-strings])
+ _APPEND_COMPILE_FLAGS_ERROR([-Wformat-security])
+ _APPEND_COMPILE_FLAGS_ERROR([-floop-parallelize-all])
+ _APPEND_COMPILE_FLAGS_ERROR([-fwrapv])
+ _APPEND_COMPILE_FLAGS_ERROR([-fmudflapt])
+ _APPEND_COMPILE_FLAGS_ERROR([-pipe])
+
+ AS_IF([test "x$ax_enable_debug" = xno],
+ [AS_IF([test "x$ac_cv_vcs_checkout" = xyes],
+ [_APPEND_COMPILE_FLAGS_ERROR([-fstack-check])
+ AS_IF([test "x$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])
+# _APPEND_COMPILE_FLAGS_ERROR([-fstack-protector-all])
+ ])])])
+
+ AS_IF([test "x$ac_cv_warnings_as_errors" = xyes],
+ [AX_APPEND_FLAG([-Werror])])
+ AC_LANG_POP([C++])
+ ])
+
+# All of the heavy lifting happens in _HARDEN_LINKER_FLAGS,
+# _HARDEN_CC_COMPILER_FLAGS, _HARDEN_CXX_COMPILER_FLAGS
+ AC_DEFUN([AX_HARDEN_COMPILER_FLAGS],
+ [AC_PREREQ([2.63])dnl
+ AC_REQUIRE([_WARNINGS_AS_ERRORS])
+ AC_REQUIRE([AX_APPEND_LINK_FLAGS])
+ AC_REQUIRE([AX_COMPILER_VERSION])
+ AC_REQUIRE([AX_DEBUG])
+ AC_REQUIRE([AX_VCS_CHECKOUT])
+
+ AC_REQUIRE([gl_VISIBILITY])
+ AS_IF([test -n "$CFLAG_VISIBILITY"],[CPPFLAGS="$CPPFLAGS $CFLAG_VISIBILITY"])
+
+ AC_REQUIRE([_HARDEN_LINKER_FLAGS])
+ AC_REQUIRE([_HARDEN_CC_COMPILER_FLAGS])
+ AC_REQUIRE([_HARDEN_CXX_COMPILER_FLAGS])
+ ])