[Bug 214258] devel/openmp: spurious libm dependency

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214258

--- Comment #3 from Jan Beich (mail not working) <jbeich at FreeBSD.org> ---
To avoid maintenance burden it'd be nice if we fix base system regression
before FreeBSD 11.1-RELEASE. devel/openmp isn't the only -lomp provider.

$ fetch https://computing.llnl.gov/tutorials/openMP/samples/C/omp_hello.c

$ pkg install llvm37 llvm38 llvm39 llvm40 llvm-devel

$ find -s /usr/local -name libomp.so
/usr/local/lib/libomp.so
/usr/local/llvm-devel/lib/libomp.so
/usr/local/llvm37/lib/libomp.so
/usr/local/llvm38/lib/libomp.so
/usr/local/llvm39/lib/libomp.so
/usr/local/llvm40/lib/libomp.so

$ clang37 -fopenmp omp_hello.c
/usr/bin/ld: cannot find -lomp
clang-3.7: error: linker command failed with exit code 1 (use -v to see
invocation)

$ clang37 -fopenmp omp_hello.c $(llvm-config37 --ldflags)
/usr/local/llvm37/lib/libomp.so: undefined reference to `scalbnl'
/usr/local/llvm37/lib/libomp.so: undefined reference to `fmaxl'
/usr/local/llvm37/lib/libomp.so: undefined reference to `logbl'
/usr/local/llvm37/lib/libomp.so: undefined reference to `scalbnf'
/usr/local/llvm37/lib/libomp.so: undefined reference to `logb'
/usr/local/llvm37/lib/libomp.so: undefined reference to `logbf'
/usr/local/llvm37/lib/libomp.so: undefined reference to `scalbn'
clang-3.7: error: linker command failed with exit code 1 (use -v to see
invocation)

$ clang38 -fopenmp omp_hello.c
/usr/local/llvm38/lib/libomp.so: undefined reference to `scalbnl'
/usr/local/llvm38/lib/libomp.so: undefined reference to `fmaxl'
/usr/local/llvm38/lib/libomp.so: undefined reference to `logbl'
/usr/local/llvm38/lib/libomp.so: undefined reference to `scalbnf'
/usr/local/llvm38/lib/libomp.so: undefined reference to `logb'
/usr/local/llvm38/lib/libomp.so: undefined reference to `logbf'
/usr/local/llvm38/lib/libomp.so: undefined reference to `scalbn'
clang-3.8: error: linker command failed with exit code 1 (use -v to see
invocation)

$ clang39 -fopenmp omp_hello.c
/usr/local/llvm39/lib/libomp.so: undefined reference to `scalbnl'
/usr/local/llvm39/lib/libomp.so: undefined reference to `fmaxl'
/usr/local/llvm39/lib/libomp.so: undefined reference to `logbl'
/usr/local/llvm39/lib/libomp.so: undefined reference to `scalbnf'
/usr/local/llvm39/lib/libomp.so: undefined reference to `logb'
/usr/local/llvm39/lib/libomp.so: undefined reference to `logbf'
/usr/local/llvm39/lib/libomp.so: undefined reference to `scalbn'
clang-3.9: error: linker command failed with exit code 1 (use -v to see
invocation)

$ clang40 -fopenmp omp_hello.c
/usr/local/llvm40/lib/libomp.so: undefined reference to `scalbnl'
/usr/local/llvm40/lib/libomp.so: undefined reference to `fmaxl'
/usr/local/llvm40/lib/libomp.so: undefined reference to `logbl'
/usr/local/llvm40/lib/libomp.so: undefined reference to `scalbnf'
/usr/local/llvm40/lib/libomp.so: undefined reference to `logb'
/usr/local/llvm40/lib/libomp.so: undefined reference to `logbf'
/usr/local/llvm40/lib/libomp.so: undefined reference to `scalbn'
clang-4.0: error: linker command failed with exit code 1 (use -v to see
invocation)

$ clang-devel -fopenmp omp_hello.c
/usr/bin/ld: cannot find -lomp
clang-5.0: error: linker command failed with exit code 1 (use -v to see
invocation)

$ clang-devel -fopenmp omp_hello.c $(llvm-config-devel --ldflags)
/usr/local/llvm-devel/lib/libomp.so: undefined reference to `scalbnl'
/usr/local/llvm-devel/lib/libomp.so: undefined reference to `fmaxl'
/usr/local/llvm-devel/lib/libomp.so: undefined reference to `logbl'
/usr/local/llvm-devel/lib/libomp.so: undefined reference to `scalbnf'
/usr/local/llvm-devel/lib/libomp.so: undefined reference to `logb'
/usr/local/llvm-devel/lib/libomp.so: undefined reference to `logbf'
/usr/local/llvm-devel/lib/libomp.so: undefined reference to `scalbn'
clang-5.0: error: linker command failed with exit code 1 (use -v to see
invocation)

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