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Makefile: Add a DISABLE_CLOCK_GETTIME option

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Allows to force-disable the use of clock_gettime() at build time,
falling back to busy-looping for udelay. This is useful when building
for systems which are known to lie about the resolution of
clock_gettime(), such as Linux guests running under the Muen Separation
Kernel.

Change-Id: I645a5d3f29ffdbd24a58127ab73d7d8755304f45
Signed-off-by: Martin Lucina <martin@lucina.net>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/48796
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Martin Lucina 2020-12-18 14:11:04 +00:00 committed by Angel Pons
parent 32f4cb4ffa
commit 3170bc3a8e
1 changed files with 5 additions and 0 deletions
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5
Makefile
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@ -1663,12 +1663,17 @@ endif
( echo "found."; echo "UTSNAME := yes" >> .features.tmp ) || \
( echo "not found."; echo "UTSNAME := no" >> .features.tmp ) } 2>>$(BUILD_DETAILS_FILE) | tee -a $(BUILD_DETAILS_FILE)
@printf "Checking for clock_gettime support... " | tee -a $(BUILD_DETAILS_FILE)
ifeq ($(DISABLE_CLOCK_GETTIME), yes)
@ { ( echo "disabled."; echo "CLOCK_GETTIME := no" >>.features.tmp ) } \
2>>$(BUILD_DETAILS_FILE) | tee -a $(BUILD_DETAILS_FILE)
else
@echo "$$CLOCK_GETTIME_TEST" >.featuretest.c
@printf "\nexec: %s\n" "$(CC) $(CPPFLAGS) $(CFLAGS) $(LDFLAGS) -lrt .featuretest.c -o .featuretest$(EXEC_SUFFIX)" >>$(BUILD_DETAILS_FILE)
@ { $(CC) $(CPPFLAGS) $(CFLAGS) $(LDFLAGS) -lrt .featuretest.c -o .featuretest$(EXEC_SUFFIX) >&2 && \
( echo "found."; echo "CLOCK_GETTIME := yes" >>.features.tmp ) || \
( echo "not found."; echo "CLOCK_GETTIME := no" >>.features.tmp ) } \
2>>$(BUILD_DETAILS_FILE) | tee -a $(BUILD_DETAILS_FILE)
endif
@$(DIFF) -q .features.tmp .features >/dev/null 2>&1 && rm .features.tmp || mv .features.tmp .features
@rm -f .featuretest.c .featuretest$(EXEC_SUFFIX)