[Bug c/59801] New: GCC does not warn on unused global variable
chengniansun at gmail dot com
gcc-bugzilla@gcc.gnu.org
Tue Jan 14 08:26:00 GMT 2014
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59801
Bug ID: 59801
Summary: GCC does not warn on unused global variable
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: chengniansun at gmail dot com
Created attachment 31829
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31829&action=edit
the test case to trigger the bug.
I used the following command
$gcc -Wall -Wextra -pedantic -std=c11 -c unused-var.c
And GCC outputs no warnings.
However in the source file unused-var.c, the last global variable "g_1853" is
NOT used.
////////////////////////////// Start of the source file /////////////
/**
* compile this program with the following command
*
* gcc -c -pedantic -std=c11 -Wall -Wextra unused-var.c
*/
static int g_37 = (-1L);
static int *g_187 = &g_37;
/**
* this variable will NOT be reported although it is NOT used.
*/
static int ** volatile g_1853 = &g_187;/* VOLATILE GLOBAL g_1853 */
////////////////////////////// End of the source file /////////////
The Gcc version is 4.9.0, built on 01/09/2014
gcc (GCC) 4.9.0 20140109 (experimental)
Copyright (C) 2014 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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