On 04/09/2010 10:00 PM, Julien Cristau wrote:
> On Fri, Apr 9, 2010 at 16:46:46 +0300, Török Edwin wrote:
>
>> When using the binutils gold linker, even if libdrm.so is already linked
>> against
>> -lrt you still need to link your app against -lrt if your app needs symbols
>> from
>> it.
>>
>> Signed-off-by: Török Edwin
>> ---
>> tests/Makefile.am |2 +-
>> 1 files changed, 1 insertions(+), 1 deletions(-)
>>
>> diff --git a/tests/Makefile.am b/tests/Makefile.am
>> index 3e74705..81006ab 100644
>> --- a/tests/Makefile.am
>> +++ b/tests/Makefile.am
>> @@ -4,7 +4,7 @@ AM_CPPFLAGS = \
>> -I $(top_srcdir)/include/drm \
>> -I $(top_srcdir)
>>
>> -LDADD = $(top_builddir)/libdrm.la
>> +LDADD = $(top_builddir)/libdrm.la @CLOCK_LIB@
>>
>> noinst_PROGRAMS = \
>> dristat \
>
> The tests don't use librt afaict, the uses of clock_gettime() are in
> libdrm and libdrm_intel. So your explanation doesn't seem to make
> sense...
The test app links dristat.o, and that includes xf86drm.c that uses
clock_gettime.
Here is the link error I get without my patch:
make[1]: Entering directory `/home/edwin/drm/tests
libtool: link: gcc -m32 -O2 -g -o .libs/dristat dristat.o
../.libs/libdrm.so
/usr/bin/ld: dristat.o: in function drmWaitVBlank:../xf86drm.c:1930:
error: undefined reference to 'clock_gettime'
/usr/bin/ld: dristat.o: in function drmWaitVBlank:../xf86drm.c:1941:
error: undefined reference to 'clock_gettime'
collect2: ld returned 1 exit status
dristat.c is including xf86drm.c directly (no idea why, shouldn't it get
what it needs from libdrm.so?):
#include "xf86drm.c"
And xf86drm.c uses clock_gettime:
xf86drm.c:ret = clock_gettime(CLOCK_MONOTONIC, &timeout);
xf86drm.c: fprintf(stderr, "clock_gettime failed: %s\n",
strerror(ret));
xf86drm.c: clock_gettime(CLOCK_MONOTONIC, &cur);
Best regards,
--Edwin
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