Disable coalesce sections when using GCC with -Wa,-q and Clang integrated assembler?

[Jeffrey Walton]

Hi Everyone,

I'm working with MacPorts GCC 6.1 on OS X. Apple's assembler is
version 1.38, so we need to use the Clang integrated assembler to
assemble streams with roughly SSE3 and above. -march=native pretty
much ensures SSE3 and above is produced.

We can enlist the Clang integrated assembler with -Wa,-q. Using GCC
6.1 with Clang is producing a stream of warnings (hundred per file):

/opt/local/bin/g++-mp-6 -DNDEBUG -g2 -O2 -fPIC -march=native -Wa,-q
-pipe -c cryptlib.cpp
<stdin>:3:11: warning: section "__textcoal_nt" is deprecated
        .section __TEXT,__textcoal_nt,coalesced,pure_instructions
                 ^      ~~~~~~~~~~~~~
<stdin>:3:11: note: change section name to "__text"
        .section __TEXT,__textcoal_nt,coalesced,pure_instructions
                 ^      ~~~~~~~~~~~~~
...

I believe this is the relevant Clang check-in:
http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20151012/305992.html
.

My question is, how do I tell GCC to stop producing the coalesce
attributes for the assembler?

Thanks in advance.