linker - undefined reference to 'clock_gettime'

[rlrosa]

hi,

i was having this issue:

Linking CXX executable ../bin/gts
/home/rela/work/dysonltd-gts/app/src/video/input/CaptureThread.cpp:99: error: undefined reference to 'clock_gettime'
collect2: ld returned 1 exit status
make[2]: *** [bin/gts] Error 1
make[1]: *** [app/CMakeFiles/gts.dir/all] Error 2
make: *** [all] Error 2

and solved it with this:

diff --git a/app/CMakeLists.txt b/app/CMakeLists.txt
index dbb653e..9ae8a1b 100644
--- a/app/CMakeLists.txt
+++ b/app/CMakeLists.txt
@@ -185,7 +185,7 @@ if(MINGW)
 elseif(MSVC)
     target_link_libraries( gts ${OpenCV2_LIBRARIES} ${QT_LIBRARIES} Log4Qt strmiids.lib )
 elseif(UNIX)
-    target_link_libraries( gts ${OpenCV2_LIBRARIES} ${QT_LIBRARIES} ${UNICAP_LIBRARIES} Log4Qt )
+    target_link_libraries( gts ${OpenCV2_LIBRARIES} ${QT_LIBRARIES} ${UNICAP_LIBRARIES} Log4Qt rt )
 endif()

 # ----------------------------------------------------------------------------
@@ -229,7 +229,7 @@ if(GTS_TESTS)
         link_directories( ${gtest_BINARY_DIR} )
         target_link_libraries( gts_test ${OpenCV2_LIBRARIES} ${QT_LIBRARIES} Log4Qt gtest strmiids.lib )
     elseif(UNIX)
-        target_link_libraries( gts_test ${OpenCV2_LIBRARIES} ${QT_LIBRARIES} ${UNICAP_LIBRARIES} Log4Qt gtest )
+        target_link_libraries( gts_test ${OpenCV2_LIBRARIES} ${QT_LIBRARIES} ${UNICAP_LIBRARIES} Log4Qt gtest rt )
     endif()
 endif()

has this happened to you? is there some path or configuration i'm missing?

thanks! salú

[akramhussein]

Hi Salú,

Not an issue i've seen on Windows or Linux. I believe it's related to the version of GCC or possibly Linux distribution. Could you let me know which version you are running just for reference?

Either way, could you create a pull request as this will start a Travis CI build and verify it won't break anything. Afterwards, i'll look to merging it with the 'develop' branch.

Thanks for spotting it and letting me know. Akram

[rlrosa]

rela@yijie-ThinkPad-L412:~/work/dysonltd-gts$ gcc --version gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3 Copyright (C) 2011 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

rela@yijie-ThinkPad-L412:~/work/dysonltd-gts$ uname -a Linux yijie-ThinkPad-L412 3.2.0-55-generic #85-Ubuntu SMP Wed Oct 2 12:29:27 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

pull request: https://github.com/dysonltd/gts/pull/8