OpenMP support configured but cannot build

[hangingman]

On Mac, with Homebrew

// install imagemagick--7.1.1-12

$ brew install imagemagick
$ brew install openjdk@11
$ sudo ln -sfn /usr/local/opt/openjdk@11/libexec/openjdk.jdk /Library/Java/JavaVirtualMachines/openjdk-11.jdk
$ ./configure --with-java-home=/Library/Java/JavaVirtualMachines/openjdk-11.jdk/Contents/Home
...
clang: error: unsupported option '-fopenmp'
...

Maybe related with
ref: ImageMagick/ImageMagick#1073

To resolve this problem on Mac, we might need to build ImageMagick from source.

[exekutive]

did you ever resolve this issue?
I get the same clang error compiling IM from source on my mac.

[hangingman]

No, I'll take a look

[hangingman]

When using homebrew imagemajick, $MAGICKCONF --cppflags always contains -fopenmp

jmagick/configure.ac

Line 402 in b4412af

MAGICK_INCLUDES=`$MAGICKCONF --cppflags`

I would like to build imagemagick --disable-openmp
ImageMagick/ImageMagick#5559

[exekutive]

ok not my case. I have a 38-core CPU, so I definitely want multiprocessing.

[hangingman]

OK, I see. So perhaps we should just install openmp on macos and do install jmagick again.
We might need to setup CC or CXX variable before start building jmagick.
ref: https://gist.github.com/ijleesw/4f863543a50294e3ba54acf588a4a421

[hangingman]

Build is passed, but I don't know it works fine.

$ brew install imagemagick openjdk@11
$ brew install llvm libomp

$ touch NEWS AUTHORS ChangeLog
$ autoreconf --force --install && automake --add-missing


$ PATH="/usr/local/Cellar/llvm/17.0.6_1/bin:$PATH" \
LDFLAGS="-I/usr/local/Cellar/libomp/18.1.3/include -L/usr/local/Cellar/llvm/17.0.6_1/lib" \
CPPFLAGS="-L/usr/local/Cellar/libomp/18.1.3/lib -I/usr/local/Cellar/llvm/17.0.6_1/include" \
CXX=/usr/local/Cellar/llvm/17.0.6_1/bin/clang++ \
CC=/usr/local/Cellar/llvm/17.0.6_1/bin/clang \
./configure \
--with-java-home=/usr/local/Cellar/openjdk@11/11.0.22 \
--with-java-includes=/usr/local/Cellar/openjdk@11/11.0.22/include

$ make

$ ls -1 lib/
jmagick-7.0.4.jar
jmagick.jar
libJMagick-7.0.4.la
libJMagick.so