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Cygwin: fix build with GCC 7 

GCC 7 is able to see straight through this trick, so use a more formal
method to avoid the warning.

Signed-off-by: Yaakov Selkowitz <yselkowi@redhat.com>
This commit is contained in:
Yaakov Selkowitz 2018-04-16 22:46:11 -05:00
parent cd31fbb2ae
commit 67609efeb0
1 changed files with 5 additions and 9 deletions
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14
winsup/cygwin/random.cc
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@ -279,14 +279,6 @@ srandom(unsigned x)
(void)random();
}
/* Avoid a compiler warning when we really want to get at the junk in
an uninitialized variable. */
static unsigned long
dummy (unsigned volatile long *x)
{
return *x;
}
/*
* srandomdev:
*
@ -313,7 +305,11 @@ srandomdev()
unsigned long junk;
gettimeofday(&tv, NULL);
srandom((getpid() << 16) ^ tv.tv_sec ^ tv.tv_usec ^ dummy(&junk));
/* Avoid a compiler warning when we really want to get at the
junk in an uninitialized variable. */
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
srandom((getpid() << 16) ^ tv.tv_sec ^ tv.tv_usec ^ junk);
#pragma GCC diagnostic pop
return;
}