From: Marco Felsch <m.felsch@pengutronix.de>
Date: Thu, 24 Nov 2022 10:02:05 +0000 (+0100)
Subject: build(makefile): add helper to detect linker options
X-Git-Tag: baikal/aarch64/sdk5.10~1^2~166^2~1
X-Git-Url: https://git.baikalelectronics.ru/?a=commitdiff_plain;h=a5f09cf7052ab6abb171400d377eecb1efac1a9b;p=arm-tf.git

build(makefile): add helper to detect linker options

This is a small helper to check for possible linker options. If the
linker supports the requested option it is returned and if not nothing
will be returned, e.g.:

  TF_LDFLAGS += $(call ld_option, --no-warn-rwx-segments)

can be called unconditional.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Change-Id: I236800852ece49948ff53a0b91fddba53c8f0f95
---

diff --git a/make_helpers/build_macros.mk b/make_helpers/build_macros.mk
index 4815efa74..89f43f2f3 100644
--- a/make_helpers/build_macros.mk
+++ b/make_helpers/build_macros.mk
@@ -87,6 +87,12 @@ define assert_numerics
     $(foreach num,$1,$(eval $(call assert_numeric,$(num))))
 endef
 
+# Convenience function to check for a given linker option. An call to
+# $(call ld_option, --no-XYZ) will return --no-XYZ if supported by the linker
+define ld_option
+	$(shell if $(LD) $(1) -v >/dev/null 2>&1; then echo $(1); fi )
+endef
+
 # CREATE_SEQ is a recursive function to create sequence of numbers from 1 to
 # $(2) and assign the sequence to $(1)
 define CREATE_SEQ