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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
View File

@ -239,6 +239,7 @@ HAS_PCI_OLD_GET_DEV := $(call c_compile_test, Makefile.d/pci_old_get_dev_test.c,
HAS_FT232H := $(call c_compile_test, Makefile.d/ft232h_test.c, $(CONFIG_LIBFTDI1_CFLAGS))
HAS_UTSNAME := $(call c_compile_test, Makefile.d/utsname_test.c)
HAS_CLOCK_GETTIME := $(call c_compile_test, Makefile.d/clock_gettime_test.c)
HAS_EXTERN_LIBRT := $(call c_link_test, Makefile.d/clock_gettime_test.c, , -lrt)
HAS_LINUX_MTD := $(call c_compile_test, Makefile.d/linux_mtd_test.c)
HAS_LINUX_SPI := $(call c_compile_test, Makefile.d/linux_spi_test.c)
HAS_LINUX_I2C := $(call c_compile_test, Makefile.d/linux_i2c_test.c)
@ -901,8 +902,10 @@ endif
ifeq ($(HAS_CLOCK_GETTIME), yes)
FEATURE_FLAGS += -D'HAVE_CLOCK_GETTIME=1'
ifeq ($(HAS_EXTERN_LIBRT), yes)
override LDFLAGS += -lrt
endif
endif
LIBFLASHROM_OBJS = $(CHIP_OBJS) $(PROGRAMMER_OBJS) $(LIB_OBJS)
OBJS = $(CLI_OBJS) $(LIBFLASHROM_OBJS)
@ -959,6 +962,7 @@ config:
@echo "Checking for header \"linux/i2c.h\": $(HAS_LINUX_I2C)"
@echo "Checking for header \"sys/utsname.h\": $(HAS_UTSNAME)"
@echo "Checking for function \"clock_gettime\": $(HAS_CLOCK_GETTIME)"
@echo "Checking for external \"librt\": $(HAS_EXTERN_LIBRT)"
@if ! [ "$(PROGRAMMER_OBJS)" ]; then \
echo "You have to enable at least one programmer driver!"; \
exit 1; \

4
Makefile.include
View File

@ -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