[PATCH] Fix testsuite race on additional_sources

[Maxim Kuvyrkov]

Hi,

This testsuite patch fixes race on additional_source testsuite variable.  When a test has both dg-additional-sources and "dg-do run { target FOO }" directives, it may occur that the FOO test will attempt to use additional_sources, which will result in failure to compile FOO test.  It often happens that FOO test was done for one of the previous testcases (which didn't use dg-additional-sources), so the failure case is not stable.

This behavior can be more-or-less reliably triggered with

make check-gcc make RUNTESTFLAGS="i386.exp=gcc.target/i386/pr64291-1.c"

The attached patch fixes the problem.  OK for trunk and 4.9 branch?

Thanks,

--
Maxim Kuvyrkov
www.linaro.org

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