ImageMagick: expected '#pragma omp' clause before 'omp_throttle'

[michael.himmelsbach@…]

ImageMagick fails to compile with an error in magic/composite.c:2757 on Snow Leopard 10.6.5 using Apples GCC 4.2.1: "error: expected '#pragma omp' clause before 'omp_throttle'". Please see attached log.

[michael.himmelsbach@…]

MacPorts error log for "port upgrade imagemagick"

[jmroot (Joshua Root)]

Please remember to cc the maintainer.

[ryandesign (Ryan Carsten Schmidt)]

Hmm, it builds fine for me on Snow Leopard. "omp" here refers to OpenMP but I'm not sure what to do with this.

[ryandesign (Ryan Carsten Schmidt)]

If you attach your config.log I could compare it with mine, see what's different.

[michael.himmelsbach@…]

I did not find a config.log, but in my macports.conf I found that I had recently enabled the use of ccache (ie, it contained "configureccache yes"). Setting "configureccache no" and doing a "port clean/configure/build/install imagemagick" then worked for me. I am up to date now, which also means that I will never use ccache again. Or is this a MacPorts-only ccache problem?

[neverpanic (Clemens Lang)]

Cc Me!

[michael.himmelsbach@…]

neverpanic, have you tried disabling ccache for MacPorts? This worked for me, and as I can see from your config.log in line 12929 (CC= ccache /usr/bin/gcc-4.2 -std=gnu99 -std=gnu99), you also have ccache enabled for building ImageMagick.

[neverpanic (Clemens Lang)]

Yes I have and it did work, but maybe we can still get to the bottom of this or at least add a message that building ImageMagick with ccache will fail.

[michael.himmelsbach@…]

Just a note: Building ImageMagick with ccache will probably only fail if another version of it was build with ccache before. If I find some time I will clear my ccache cache and see if it works then.

[nstanger (Nigel Stanger)]

Same problem here too. "sudo ccache -C" followed by "port clean/upgrade imagemagick" failed with the same error. Disabling ccache completely followed by "port clean/upgrade imagemagick" worked fine.

[ryandesign (Ryan Carsten Schmidt)]

Hmm. I had never used ccache before, but I've now installed it and configured MacPorts to use it, and ImageMagick still built fine for me.

[raimue (Rainer Müller)]

Cc Me!

[raimue (Rainer Müller)]

First it failed in the same way for me as described above. It looks like the omp_throttle(1) macro was not pre-processed and was not expanded. Therefore the compiler chokes on the unknown directive.

But it works now with a clean ccache. My guess is that ccache was unable to detect changes for whatever reason and used old pre-processed input (old headers?) from the cache.

[ryandesign (Ryan Carsten Schmidt)]

Has duplicate #27873. I guess I should disable ccache for ImageMagick.

[ryandesign (Ryan Carsten Schmidt)]

r74894

[dhruvahuja@…]

Replying to michael.himmelsbach@…:

ImageMagick fails to compile with an error in magic/composite.c:2757 on Snow Leopard 10.6.5 using Apples GCC 4.2.1: "error: expected '#pragma omp' clause before 'omp_throttle'". Please see attached log.

Setting the CCACHE_CPP2 environment variable changes the preprocessing behaviour making it compatible with ImageMagick. Not all ccache performance is lost. More information on usage at: ​http://workin.gs/compiling-imagemagick-ccache and on the explanation of the behaviour at: ​http://ccache.samba.org/manual.html#_environment_variables . I tested this on SLES 11.1 x86_64 , though.