On 12/07/2019 12:28 AM, Kazuhito Hagio wrote:
>> -----Original Message-----
>>
>> On 12/05/2019 06:36 AM, Kazuhito Hagio wrote:
>>> Hi Pingfan,
>>>
>>> Thank you for the patch.
>>>
>>>> -----Original Message-----
>>>> since the following commit, -lebl has been removed from elfutils.
>>>> commit b833c731359af12af9f16bcb621b3cdc170eafbc
>>>> Author: Mark Wielaard <mark@xxxxxxxxx>
>>>> Date: Thu Aug 29 23:34:11 2019 +0200
>>>>
>>>> libebl: Don't install libebl.a, libebl.h and remove backends from spec.
>>>>
>>>> All archive members from libebl.a are now in libdw.a. We don't generate
>>>> separate backend shared libraries anymore. So remove them from the
>>>> elfutils.spec file.
>>>>
>>>> Signed-off-by: Mark Wielaard <mark@xxxxxxxxx>
>>>>
>>>> So remove it from LIBS for makedumpfile
>>>
>>> It seems that this is ok with the latest elfutils, but with older ones?
>>> Is it possible to remove -lebl when elfutils does not have libebl.a?
>> I have no idea about it for now. The method to check version depends on
>> distribution. Is it doable by checking /usr/lib64/libebl ?
>
> We have 'try-run' function written by Petr in the Makefile, which checks
> if clock_gettime() requies -lrt. How about utilizing it like this?
>
> diff --git a/Makefile b/Makefile
> index 1fdb6286e85d..d4d1fb563209 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -50,7 +50,7 @@ OBJ_PART=$(patsubst %.c,%.o,$(SRC_PART))
> SRC_ARCH = arch/arm.c arch/arm64.c arch/x86.c arch/x86_64.c arch/ia64.c arch/ppc64.c arch/s390x.c arch/ppc.c arch/sparc64.c
> OBJ_ARCH=$(patsubst %.c,%.o,$(SRC_ARCH))
>
> -LIBS = -ldw -lbz2 -lebl -ldl -lelf -lz
> +LIBS = -ldw -lbz2 -ldl -lelf -lz
> ifneq ($(LINKTYPE), dynamic)
> LIBS := -static $(LIBS)
> endif
> @@ -79,6 +79,11 @@ LINK_TEST_PROG="int clock_gettime(); int main(){ return clock_gettime(); }"
> LIBS := $(LIBS) $(call try-run,\
> echo $(LINK_TEST_PROG) | $(CC) $(CFLAGS) -o "$$TMP" -x c -,,-lrt)
>
> +# elfutils-0.178 or later does not install libebl.a.
> +LINK_TEST_PROG="int main() { return 0; }"
> +LIBS := $(LIBS) $(call try-run,\
> + echo $(LINK_TEST_PROG) | $(CC) -o "$$TMP" -x c - -lebl,-lebl,)
> +
> all: makedumpfile
>
> $(OBJ_PART): $(SRC_PART)
>
>
> If libebl.a does not exist (gcc with -lebl fails), it will not append
> -lebl to LIBS.
>
Yes, it sounds a good idea.
Should I sumbit another patch or you will do by yourself?
Thanks,
Pingfan
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