COLLECT_GCC and friends

[Mark Mitchell]

We pass COLLECT_GCC and COLLECT_GCC_OPTIONS through the environment
rather than through command-line arguments to collect2?

It's rather tricky us hiding these things away, and makes cutting and
pasting -v output in the shell not work, which is very unfriendly to
debugging on platforms where collect2 is used.

What's the rationale?

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Mark Mitchell                   mark@codesourcery.com
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