Author: Florian Weimer <fweimer@redhat.com>
Date:   Wed Jul 4 16:16:57 2018 +0200

    Makeconfig (ASFLAGS): Always append required assembler flags.

Submitted upstream here:

  https://sourceware.org/ml/libc-alpha/2018-07/msg00077.html

Otherwise, we lose essential flags such as -Wa,--noexecstack due to
the way += works in make due to the ASFLAGS command line override.

diff --git a/Makeconfig b/Makeconfig
index b0b27f0113ac18b8..92e76d6200bbcd5b 100644
--- a/Makeconfig
+++ b/Makeconfig
@@ -1047,7 +1047,7 @@ endif
 ifndef ASFLAGS
 ASFLAGS := $(filter -g% -fdebug-prefix-map=%,$(CFLAGS))
 endif
-ASFLAGS += -Werror=undef $(ASFLAGS-config) $(asflags-cpu)
+override ASFLAGS += -Werror=undef $(ASFLAGS-config) $(asflags-cpu)
 
 ifndef BUILD_CC
 BUILD_CC = $(CC)
