[Bug 222858] Clang doesn't find <omp.h> and libomp.so when compiling with -fopenmp

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222858

            Bug ID: 222858
           Summary: Clang doesn't find <omp.h> and libomp.so when
                    compiling with -fopenmp
           Product: Base System
           Version: 11.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: misc
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: equilibrium556 at gmx.de

Created attachment 186994
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=186994&action=edit
OpenMP C test file

Trying to compile C code that utilizes OpenMP with Clang on FreeBSD 11.1
results in some compiler/linker errors:

Trying to compile with:
clang -o openmp_test openmp_test.c -fopenmp

openmp_test.c:1:10: fatal error: 'omp.h' file not found

It is located in /usr/local/include (openmp package) though

Trying again to compile with:
clang -o openmp_test openmp_test.c -fopenmp -I/usr/local/include

/usr/bin/ld: cannot find -lomp

It is located in /usr/local/lib (openmp package)

Finally, it compiles with:
clang -o openmp_test openmp_test.c -fopenmp -I/usr/local/include
-L/usr/local/lib

Shouldn't it add the right search paths for OpenMP from the get-go when issuing
-fopenmp?

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