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commit b1eda10e17bf2056ca79a534d92fe0b0b06bd410
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Author: Paul Eggert <eggert@cs.ucla.edu>
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Date: Tue Nov 25 14:12:48 2014 -0800
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fnmatch: work around GCC compiler warning bug with uninit var
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* posix/fnmatch_loop.c (FCT): Use a scalar not a one-item array.
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This works around a bug with x86-64 GCC 4.9.2 and earlier
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where 'gcc -O2 -Wmaybe-uninitialized' incorrectly complains
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"../locale/weightwc.h:93:7: warning: '*((void *)&str+4)' may be
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used uninitialized in this function [-Wmaybe-uninitialized]".
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diff --git a/posix/fnmatch_loop.c b/posix/fnmatch_loop.c
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index e289f451cc23c1ee..2bd788f3942c6e7d 100644
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--- a/posix/fnmatch_loop.c
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+++ b/posix/fnmatch_loop.c
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@@ -342,7 +342,12 @@ FCT (pattern, string, string_end, no_leading_period, flags, ends, alloca_used)
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#ifdef _LIBC
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else if (c == L('[') && *p == L('='))
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{
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- UCHAR str[1];
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+ /* It's important that STR be a scalar variable rather
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+ than a one-element array, because GCC (at least 4.9.2
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+ -O2 on x86-64) can be confused by the array and
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+ diagnose a "used initialized" in a dead branch in the
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+ findidx function. */
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+ UCHAR str;
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uint32_t nrules =
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_NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES);
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const CHAR *startp = p;
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@@ -354,7 +359,7 @@ FCT (pattern, string, string_end, no_leading_period, flags, ends, alloca_used)
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c = L('[');
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goto normal_bracket;
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}
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- str[0] = c;
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+ str = c;
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c = *++p;
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if (c != L('=') || p[1] != L(']'))
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@@ -367,7 +372,7 @@ FCT (pattern, string, string_end, no_leading_period, flags, ends, alloca_used)
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if (nrules == 0)
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{
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- if ((UCHAR) *n == str[0])
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+ if ((UCHAR) *n == str)
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goto matched;
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}
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else
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@@ -382,7 +387,7 @@ FCT (pattern, string, string_end, no_leading_period, flags, ends, alloca_used)
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# endif
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const int32_t *indirect;
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int32_t idx;
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- const UCHAR *cp = (const UCHAR *) str;
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+ const UCHAR *cp = (const UCHAR *) &str;
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/* This #include defines a local function! */
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# if WIDE_CHAR_VERSION
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