[PATCH] libstdc++ testsuite cxxflags

[Cesar Philippidis <cesar at codesourcery dot com>]

[I sent this to gcc-patches, but I forgot to send it to this mailing list.]

This patch addresses two issues with the libstdc++ testsuite:

  * duplicate "-g -O2" CXXFLAGS
  * missing "-g -O2" for remote targets

The duplicate "-g -O2" flags is a result of testsuite_flags.in using
build-time CXXFLAGS and proc libstdc++_init using the environmental
CXXFLAGS, which defaults to its build-time value. This patch prevents
testsuite_flags.in from using build-time CXXFLAGS.

Certain remote targets require a minimum optimization level -O1 in order
to pass several atomics built-in function tests. This patch ensures
cxxflags contains "-g -O2" at minimum when no other optimization flags
are specified. The testsuite used to set those flags prior to Benjamin's
patch to remove duplicate cxxflags here
<http://gcc.gnu.org/ml/gcc-patches/2012-03/msg01572.html>.

Is this OK for trunk? If so, please apply (I don't have commit rights).

Thanks,
Cesar

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