note: use option -std=c99 or -std=gnu99 to compile your code about apriltag HOT 10 CLOSED

same cmake build error in ubuntu 18.04 x86.

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I've made some more progress but still not complete. I've changed 3 files and added -std=c99 flags to all 3 build targets:

CMakeFiles/apriltag_demo.dir/flags.make:5:C_FLAGS = -O2 -DNDEBUG -std=c99 CMakeFiles/apriltag_python.dir/build.make:68: /bin/cc -std=c99 -Wno-unused-result -Wsign-compare -DDYNAMIC_ANNOTATIONS_ENABLED=1 -DNDEBUG -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic -D_GNU_SOURCE -fPIC -fwrapv -I/opt/rh/rh-python36/root/usr/include -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic -D_GNU_SOURCE -fPIC -fwrapv -fPIC -I/opt/rh/rh-python36/root/usr/include/python3.6m -Wno-strict-prototypes -I/root/apriltag -c -o apriltag_pywrap.o /root/apriltag/apriltag_pywrap.c CMakeFiles/apriltag.dir/flags.make:5:C_FLAGS = -O2 -DNDEBUG -fPIC -std=c99
I also installed rh-python36-numpy package, as I am using software collections for python 3.6.
This got me all the way to the python
There is an error because the python build looks for the lib directory (I have lib64), so I soft-linked that.

Here is my last error:
# make install [ 83%] Built target apriltag [ 89%] Built target apriltag_demo [ 91%] Generating apriltag.cpython-36m-x86_64-linux-gnu.so /bin/ld: cannot find -lpython3.6m collect2: error: ld returned 1 exit status make[2]: *** [apriltag.cpython-36m-x86_64-linux-gnu.so] Error 1 make[1]: *** [CMakeFiles/apriltag_python.dir/all] Error 2 make: *** [all] Error 2

Thanks!

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this error maybe you can try add command link_directories(dir-to-libpython3.6.so).

I solved problem like this but lib is libpthread.so.

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I do some changes about default CMakeList.txt. but stoped at :

Generating apriltag_detect.docstring.h
[ 91%] Generating apriltag_pywrap.o
cc: error: unrecognized command line option ‘-fstack-protector-strong’
CMakeFiles/apriltag_python.dir/build.make:67: recipe for target 'apriltag_pywrap.o' failed
make[2]: *** [apriltag_pywrap.o] Error 1
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/apriltag_python.dir/all' failed
make[1]: *** [CMakeFiles/apriltag_python.dir/all] Error 2
Makefile:129: recipe for target 'all' failed
make: *** [all] Error 2

the error file

apriltag_pywrap.o: apriltag_pywrap.c
 65 apriltag_pywrap.o: apriltag_detect.docstring.h
 66 apriltag_pywrap.o: apriltag_py_type.docstring.h
 67         @$(CMAKE_COMMAND) -E cmake_echo_color --switch=$(COLOR) --blue --bold --progress-dir=/home/apollo/apriltag/CMakeFiles --progress-n    um=$(CMAKE_PROGRESS_2) "Generating apriltag_pywrap.o"
 68         /usr/bin/cc -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -Wall -g -fstack-protector-strong -Wformat -Werror=format-securi    ty -g -flto -fuse-linker-plugin -ffat-lto-objects -fPIC -I/usr/include/python3.6m -Wno-strict-prototypes -I/home/apollo/apriltag -c -o apr    iltag_pywrap.o /home/apollo/apriltag/apriltag_pywrap.c

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I got it compiled! I exported LIBRARY_PATH=/opt/rh/rh-python36/root/usr/lib64, which is my $LD_LIBRARY_PATH. Maybe it's working now.

# make install [ 83%] Built target apriltag [ 89%] Built target apriltag_demo [ 91%] Generating apriltag.cpython-36m-x86_64-linux-gnu.so [100%] Built target apriltag_python Install the project... -- Install configuration: "Release" -- Installing: /usr/local/lib64/libapriltag.so.3.1.0 -- Installing: /usr/local/lib64/libapriltag.so.3 -- Installing: /usr/local/lib64/libapriltag.so -- Installing: /usr/local/include/apriltag/apriltag.h -- Installing: /usr/local/include/apriltag/apriltag_math.h -- Installing: /usr/local/include/apriltag/apriltag_pose.h -- Installing: /usr/local/include/apriltag/common/doubles.h -- Installing: /usr/local/include/apriltag/common/doubles_floats_impl.h -- Installing: /usr/local/include/apriltag/common/floats.h -- Installing: /usr/local/include/apriltag/common/g2d.h -- Installing: /usr/local/include/apriltag/common/getopt.h -- Installing: /usr/local/include/apriltag/common/homography.h -- Installing: /usr/local/include/apriltag/common/image_types.h -- Installing: /usr/local/include/apriltag/common/image_u8.h -- Installing: /usr/local/include/apriltag/common/image_u8x3.h -- Installing: /usr/local/include/apriltag/common/image_u8x4.h -- Installing: /usr/local/include/apriltag/common/matd.h -- Installing: /usr/local/include/apriltag/common/math_util.h -- Installing: /usr/local/include/apriltag/common/pam.h -- Installing: /usr/local/include/apriltag/common/pjpeg.h -- Installing: /usr/local/include/apriltag/common/pnm.h -- Installing: /usr/local/include/apriltag/common/postscript_utils.h -- Installing: /usr/local/include/apriltag/common/string_util.h -- Installing: /usr/local/include/apriltag/common/svd22.h -- Installing: /usr/local/include/apriltag/common/time_util.h -- Installing: /usr/local/include/apriltag/common/timeprofile.h -- Installing: /usr/local/include/apriltag/common/unionfind.h -- Installing: /usr/local/include/apriltag/common/workerpool.h -- Installing: /usr/local/include/apriltag/common/zarray.h -- Installing: /usr/local/include/apriltag/common/zhash.h -- Installing: /usr/local/include/apriltag/common/zmaxheap.h -- Installing: /usr/local/include/apriltag/tag16h5.h -- Installing: /usr/local/include/apriltag/tag25h9.h -- Installing: /usr/local/include/apriltag/tag36h11.h -- Installing: /usr/local/include/apriltag/tagCircle21h7.h -- Installing: /usr/local/include/apriltag/tagCircle49h12.h -- Installing: /usr/local/include/apriltag/tagCustom48h12.h -- Installing: /usr/local/include/apriltag/tagStandard41h12.h -- Installing: /usr/local/include/apriltag/tagStandard52h13.h -- Installing: /usr/local/share/apriltag/cmake/apriltagConfig.cmake -- Installing: /usr/local/share/apriltag/cmake/apriltagConfig-release.cmake -- Installing: /usr/local/lib/pkgconfig/apriltag.pc cp: cannot create regular file ‘/root/.local/lib/python3.6/site-packages’: No such file or directory -- Installing: /usr/local/bin/apriltag_demo -- Set runtime path of "/usr/local/bin/apriltag_demo" to ""

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congratulations @jimmccartney

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I think this is a python link problem, comment python warp for now, and build successfully.

If you are intrested about diff, here is :https://gist.github.com/mickeyouyou/93da4086d2c2d5ace02555c90e89130b

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Okay, got it all working. Here are my notes that I think are complete:
Apriltag on RHEL7

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Sorry I didn't see this earlier. I've made some improvements to how the python wrapper works so it hopefully will now work without needing to set LIBRARY_PATH, but not totally sure.

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Add
SET(CMAKE_C_FLAGS "-std=c99")
at CmakeLists.txt on line 3.

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