Makefile: check if librt is an external library
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>
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/61523
Original-Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/flashrom-stable/+/72291
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/Makefile b/Makefile
index 8309517..f10504f 100644
--- a/Makefile
+++ b/Makefile
@@ -241,6 +241,7 @@
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 := $(call c_compile_test, Makefile.d/linux_i2c_test.c)
@@ -875,8 +876,10 @@
ifeq ($(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)
@@ -933,6 +936,7 @@
@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; \