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build(makefile): add helper to detect linker options

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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
This commit is contained in:
Marco Felsch 2022-11-24 11:02:05 +01:00
parent 404e835c33
commit a5f09cf705
1 changed files with 6 additions and 0 deletions
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6
make_helpers/build_macros.mk
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@ -87,6 +87,12 @@ define assert_numerics
$(foreach num,$1,$(eval $(call assert_numeric,$(num)))) $(foreach num,$1,$(eval $(call assert_numeric,$(num))))
endef 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 # CREATE_SEQ is a recursive function to create sequence of numbers from 1 to
# $(2) and assign the sequence to $(1) # $(2) and assign the sequence to $(1)
define CREATE_SEQ define CREATE_SEQ