[Bug 252379] Mk/Uses/compiler.mk: remove USE_GCC=yes for compiler:openmp due to libomp.so is part of base since 11.3/12.1

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252379

--- Comment #17 from Jason W. Bacon <jwb at freebsd.org> ---
(In reply to Antoine Brodin from comment #16)

That strategy falls short on our goal to stop using gcc where it isn't really
needed.  We'd be using gcc on amd64 because gcc 4.2 doesn't provide c++-14 on
powerpc, for example.

The patch below adds a default value for CHOSEN_COMPILER_TYPE based on the
architecture, which can be overridden by compiler.mk.

Index: /usr/ports/Mk/bsd.port.mk
===================================================================
--- /usr/ports/Mk/bsd.port.mk   (revision 560811)
+++ /usr/ports/Mk/bsd.port.mk   (working copy)
@@ -1141,6 +1141,15 @@
 _EXPORTED_VARS+=       PPC_ABI
 .endif

+.if !defined(CHOSEN_COMPILER_TYPE)
+# FIXME: Are there other archs that use gcc in base?
+.if ${ARCH} == powerpc64 || ${ARCH} == powerpc
+CHOSEN_COMPILER_TYPE=gcc
+.else
+CHOSEN_COMPILER_TYPE=clang
+.endif
+.endif
+
 # Get operating system versions for a cross build
 .if defined(CROSS_SYSROOT)
 .if !exists(${CROSS_SYSROOT}/usr/include/sys/param.h)

I think this is a good starting point, but there may be a better place to set
this or other issues to resolve.

So far biology/clang and biology/gcta both fail to build with clang.

I'll try to correct these issues and temporarily set USE_GCC unconditionally as
a stop-gap if I can't resolve them quickly.

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