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bug#9262: test.c runs afoul of GCC 4.6.1 bug if --enable-gcc-warnings

From: Paul Eggert
Subject: bug#9262: test.c runs afoul of GCC 4.6.1 bug if --enable-gcc-warnings
Date: Mon, 08 Aug 2011 11:55:04 -0700
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20110617 Thunderbird/3.1.11

I'm running into a problem with GCC 4.6.1 x86-64 when
compiling coreutils (latest git version), configured
with --enable-gcc-warnings.  A bogus warning is generated,
causing "make" to fail.  The warning is "function might be
candidate for attribute 'pure' if it is known to return
normally [-Wsuggest-attribute=pure]", and it points to the
"advance" function in test.c.  The warning is also generated
for lbracket.c, which includes test.c.

This is due to a GCC bug that has just been confirmed; see

For now I'm leaving this alone, but I thought I'd give
others a heads-up.  The coreutils code is pretty
crufty but on the other hand I dislike modifying code just
to work around bugs in static checkers.

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