[RFA] [gdb.threads/testsuite] failure while checking backtrace into main

[Denis PILAT <denis.pilat@st.com>]

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While checking for non-regression in the gdb.threads part of the 
testsuite, I noticed one test fails with gcc4 since the argument of the 
main are removed by the compiler so don't appear when printing backtrace:
FAIL: gdb.threads/pthreads.exp: check backtrace from main thread

Either we can change the .exp file to avoid checking these arguments, or 
we can ensure compiler keeps them as proposed hereby.

-- 
Denis Pilat
STMicroelectronics

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2007-01-31  Denis Pilat  <denis.pilat@st.com>

	* gdb.threads/pthreads.c: ensure argc and argv won't be removed by
	a compiler optimization.

Index: testsuite/gdb.threads/pthreads.c
===================================================================
--- testsuite/gdb.threads/pthreads.c	(revision 553)
+++ testsuite/gdb.threads/pthreads.c	(working copy)
@@ -122,6 +122,8 @@ main(argc, argv)
   void (*xxx) ();
   pthread_attr_t attr;
 
+  if (argv);
+  j = argc;
   if (verbose) printf ("pid = %d\n", getpid());
 
   foo (1, 2, 3);