[Bug 214258] devel/openmp: spurious libm dependency

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

Yuta Satoh <nigoro.dev at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |nigoro.dev at gmail.com

--- Comment #2 from Yuta Satoh <nigoro.dev at gmail.com> ---
Created attachment 179304
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=179304&action=edit
ports/devel/openmp/files/patch-link-libm.patch

Sample patch for devel/openmp-3.9.0.

The attached patch links libm.
-Wl,--no-as-needed is necessary for forced linking.


Before applying the patch)
# ldd /usr/local/lib/libomp.so
/usr/local/lib/libomp.so:
        libthr.so.3 => /lib/libthr.so.3 (0x801288000)
        libc.so.7 => /lib/libc.so.7 (0x800823000)

After applying the patch)
# ldd /usr/local/lib/libomp.so
/usr/local/lib/libomp.so:
        libm.so.5 => /lib/libm.so.5 (0x801288000)
        libthr.so.3 => /lib/libthr.so.3 (0x8014b3000)
        libc.so.7 => /lib/libc.so.7 (0x800823000)


$ echo 'int main() { }' | cc -fopenmp -L/usr/local/lib -xc - -v
FreeBSD clang version 3.8.0 (tags/RELEASE_380/final 262564) (based on LLVM
3.8.0)
Target: x86_64-unknown-freebsd11.0
Thread model: posix
InstalledDir: /usr/bin
 "/usr/bin/cc" -cc1 -triple x86_64-unknown-freebsd11.0 -emit-obj -mrelax-all
-disable-free -disable-llvm-verifier -main-file-name - -mrelocation-model
static -mthread-model posix -mdisable-fp-elim -masm-verbose
-mconstructor-aliases -munwind-tables -target-cpu x86-64 -v -dwarf-column-info
-debugger-tuning=gdb -resource-dir /usr/bin/../lib/clang/3.8.0
-fdebug-compilation-dir /usr/home/nigoro -ferror-limit 19 -fmessage-length 172
-fopenmp -fobjc-runtime=gnustep -fdiagnostics-show-option -fcolor-diagnostics
-o /tmp/--26d632.o -x c -
clang -cc1 version 3.8.0 based upon LLVM 3.8.0 default target
x86_64-unknown-freebsd11.0
#include "..." search starts here:
#include <...> search starts here:
 /usr/bin/../lib/clang/3.8.0/include
 /usr/include
End of search list.
 "/usr/bin/ld" --eh-frame-hdr -dynamic-linker /libexec/ld-elf.so.1
--hash-style=both --enable-new-dtags -o a.out /usr/lib/crt1.o /usr/lib/crti.o
/usr/lib/crtbegin.o -L/usr/local/lib -L/usr/lib /tmp/--26d632.o -lomp -lgcc
--as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed
/usr/lib/crtend.o /usr/lib/crtn.o

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