On Monday 30 October 2017 17:30:53 Hans Verkuil wrote: > Hi Pavel, > > On 10/28/2017 09:57 PM, Pavel Machek wrote: > > Add support for simple SDL test application. Allows taking jpeg > > snapshots, and is meant to run on phone with touchscreen. Not > > particulary useful on PC with webcam, but should work. > > When I try to build this I get: > > make[3]: Entering directory '/home/hans/work/src/v4l/v4l-utils/contrib/test' > CCLD sdlcam > /usr/bin/ld: sdlcam-sdlcam.o: undefined reference to symbol 'log2@@GLIBC_2.2.5' > //lib/x86_64-linux-gnu/libm.so.6: error adding symbols: DSO missing from command line > collect2: error: ld returned 1 exit status > Makefile:561: recipe for target 'sdlcam' failed > make[3]: *** [sdlcam] Error 1 > make[3]: Leaving directory '/home/hans/work/src/v4l/v4l-utils/contrib/test' > Makefile:475: recipe for target 'all-recursive' failed > make[2]: *** [all-recursive] Error 1 > make[2]: Leaving directory '/home/hans/work/src/v4l/v4l-utils/contrib' > Makefile:589: recipe for target 'all-recursive' failed > make[1]: *** [all-recursive] Error 1 > make[1]: Leaving directory '/home/hans/work/src/v4l/v4l-utils' > Makefile:516: recipe for target 'all' failed > make: *** [all] Error 2 > > I had to add -lm -ldl -lrt to sdlcam_LDFLAGS. Is that correct? Is not for <<undefined reference to symbol 'log2@@GLIBC_2.2.5'>> needed just -lm? log2 should be in mathematical library. -- Pali Rohár pali.rohar@xxxxxxxxx
