Re: Have GCC uses NASM as the assembler?

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On Thu, 28 Dec 2017, Jeffrey Walton wrote:

We are trying to build a library on Solaris 11.3. We installed GCC 5.4
so we have an update compiler available.

Did you follow the recommendations at https://gcc.gnu.org/install/specific.html#ix86-x-solaris210 ?
"It is recommended that you configure GCC to use the GNU assembler"

g++ -g2 -O3 -fPIC -m64 -Wa,--divide -msse4.2 -msha -c sha-simd.cpp
{standard input}: Assembler messages:
{standard input}:166: Error: no such instruction: `sha1rnds4 $0,%xmm0,%xmm7'
{standard input}:199: Error: no such instruction: `sha1nexte %xmm0,%xmm2'
{standard input}:206: Error: no such instruction: `sha1msg1 %xmm0,%xmm10'
{standard input}:212: Error: no such instruction: `sha1rnds4 $0,%xmm2,%xmm9'
{standard input}:239: Error: no such instruction: `sha1nexte %xmm2,%xmm7'
...

It seems the Solaris assembler cannot handle SHA extensions at this time:

/usr/bin/as -V </dev/null
as: Studio 12.5 Compiler Common 12.5 SunOS_i386 s11_3sru9_2 05/16/2016

It is better to compile a dummy program with g++ -v, it ensures that you get version info about the assembler that g++ actually calls.

We would like to ask GCC to use NASM instead of 'as'.

I don't think nasm is supported, try gas instead.

Is there a way to tell GCC to use a different assembler?

If the compiler is really different (not just a newer version with compatible options), you need to recompile gcc.

--
Marc Glisse



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