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Makefile: check if librt is an external library

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Some systems, e.g. OpenBSD, have clock_gettime / librt build into the
libc and therefore fail to link against it with -lrt. Thus, detect this
and link only if needed.

Change-Id: I2c1668a350aa0806fccfb4e9cd8b04861f085ee9
Signed-off-by: Thomas Heijligen <thomas.heijligen@secunet.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/61523
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
This commit is contained in:
Thomas Heijligen
2022-01-31 23:49:44 +01:00
committed by Nico Huber
parent 9fb5812896
commit 274e146621
2 changed files with 8 additions and 0 deletions
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4
Makefile.include
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@ -40,6 +40,10 @@ define c_compile_test # $1: files to compile, $2: cflags
$(call debug_shell, $(CC) -c -Wall -Werror $2 $1 -o /dev/null && echo yes || echo no)
endef
define c_link_test # $1: file to compile and link, $2: cflags, $3: ldflags
$(call debug_shell, $(CC) -Wall -Werror $2 $1 $3 -o /dev/null && echo yes || echo no)
endef
define find_dependency
$(call debug_shell, $(if $(PKG_CONFIG_LIBDIR),PKG_CONFIG_LIBDIR=$(PKG_CONFIG_LIBDIR),) $(PKG_CONFIG) --exists $1 && echo yes || echo no)
endef