Re: Testing glibc with non-default options

[Mike Frysinger <vapier at gentoo dot org>]

On 29 Feb 2016 16:21, Steve Ellcey  wrote:
> I have a question about running the GCC testsuite when using non-default
> GCC options.  I am running the glibc test natively on a MIPS machine
> and I want to build and test it with the 64 bit ABI (-mabi=64).
> 
> I can use "export GCC='gcc -mabi=64'" or "CFLAGS='-mabi=64'" (I am not sure
> which method is prefered) and when I do either of those, the build works fine
> and most of the testing works fine but I keep hitting a problem when I get to
> the test-math-isinff.cc test.  Note that this is a C++ test and not a C test
> and I think that is relevent.
> 
> I looked in config.make and I see a setting for CC and CFLAGS but CXX is not
> set (even if I set and export it when building glibc) and CXXFLAGS does not
> show up at all.  I think this may be why the C++ test fails but I am not sure
> how to fix it.
> 
> Has anyone else seen this problem or have any idea on how to fix it?

i assume you meant `export CC=...` as $GCC is something else.

i would expect you also need to override CXX and/or CXXFLAGS if you want
the C++ tests to pass.  CFLAGS should not be used when building C++ code.

passing the ABI flags via CFLAGS should work.  the mips configure scripts
will use the full compile line to detect which -mabi to use, and then the
mips Makefiles will explicitly add the flag to CC if it isn't there.
-mike

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