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[PATCH 06/14 v3] Compile the entire dynamic linker with -fno-stack-protector.

From: Nick Alcock <>

Also compile corresponding routines in the static libc.a with the same

v3: Use $(no-stack-protector).
    Introduce $(elide-stack-protector) and use it to reduce redundancy.
    Bring all the elisions together textually.

	* elf/Makefile (elide-stack-protector): New.
	(CFLAGS-.os): Use it, eliding $(all-rtld-routines).
	(CFLAGS-.oX): Likewise, eliding $(elide-routines.os).
	(rtld-CFLAGS): Likewise.
 elf/Makefile   | 13 +++++++++++++
 elf/rtld-Rules |  2 ++
 2 files changed, 15 insertions(+)

diff --git a/elf/Makefile b/elf/Makefile
index 63a5355..0037cca 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -50,6 +50,19 @@ CFLAGS-dl-runtime.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-dl-lookup.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-dl-iterate-phdr.c = $(uses-callbacks)
+# Compile rtld itself without stack protection.
+# Also compile all routines in the static library that are elided from
+# the shared libc because they are in the same way.
+define elide-stack-protector
+$(if $(filter $(@F),$(patsubst %,%$(1),$(2))), $(no-stack-protector))
+CFLAGS-.o += $(call elide-stack-protector,.o,$(elide-routines.os))
+CFLAGS-.op += $(call elide-stack-protector,.op,$(elide-routines.os))
+CFLAGS-.og += $(call elide-stack-protector,.og,$(elide-routines.os))
+CFLAGS-.os += $(call elide-stack-protector,.os,$(all-rtld-routines))
 ifeq ($(unwind-find-fde),yes)
 routines += unwind-dw2-fde-glibc
 shared-only-routines += unwind-dw2-fde-glibc
diff --git a/elf/rtld-Rules b/elf/rtld-Rules
index 94ca39b..1c8593e 100644
--- a/elf/rtld-Rules
+++ b/elf/rtld-Rules
@@ -144,4 +144,6 @@ cpp-srcs-left := $(rtld-modules:%.os=%)
 lib := rtld
 include $(patsubst %,$(..),$(cpp-srcs-left))
+rtld-CFLAGS := $(no-stack-protector)

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