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[Bug libc/4681] New: declaring “strcmp()” as an extern function with inclusion of “string.h” is causing compilation error
- From: "suma dot sharma at kpitcummins dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: 21 Jun 2007 09:26:30 -0000
- Subject: [Bug libc/4681] New: declaring “strcmp()” as an extern function with inclusion of “string.h” is causing compilation error
- Reply-to: sourceware-bugzilla at sourceware dot org
Hi,
I have successfully built SH4-Linux toolchain based on
(binutils-2.17, gcc-4.2-20061205, glibc-2.5) for Renesas SH target.
I am facing problems while compiling the following testcase-
------------------------------------------------------------------
TESTCASE
#include<string.h>
#include<stdio.h>
extern int strcmp(const char *,const char *);
int main()
{
char s1[3];
char s2[3];
strcpy(s1,"12");
strcpy(s2,"2");
printf("\n\t %d",strcmp(s1,s2));
return 0;
}
-------------------------------------------------------------------------
PROBLEM
The above testcase gets compiled with '-O0' optimization successfully----
?/sh4-linux-gcc testcase.c ?o a.out ?O0
but on compilation with '-O2' optimization option------
?/sh4-linux-gcc testcase.c ?o a.out ?O2
it gives the following
error:-
testcase.c:4: error: expected identifier or ?(? before ?__extension__?
testcase.c:4: error: expected identifier or ?(? before ?)? token
OBSERVATIONS
1. In the above testcase, declaring ?strcmp()? as an extern function with
inclusion of ?string.h? is causing the above mentioned compilation error. But
on the other hand, if either of the two scenarios is used i.e. either
?string.h? is included or ?strcmp()? is declared as an extern function only,
then it compiles successfully with ?O2 option.
2. This problem has been observed with
sh-linux toolchain (gcc-4.2)
i686-pc-linux toolchain (gcc-4.1.1, Fedora Core 6)
i686-pc-linux toolchain (gcc-4.2.0)
Any help on this will be appreciated.
Regards,
Suma Sharma
KPIT Cummins Infosystems Ltd,
Pune (INDIA)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Free download of GNU based SH-Linux toolchains for Renesas' SH
Series.
The following site also offers free technical support to its
users.
Visit http://www.kpitgnutools.com for details.
Latest versions of KPIT GNU SH-Linux tools were released on April 5,
2007.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
--
Summary: declaring ?strcmp()? as an extern function with
inclusion of ?string.h? is causing compilation error
Product: glibc
Version: unspecified
Status: NEW
Severity: normal
Priority: P3
Component: libc
AssignedTo: drepper at redhat dot com
ReportedBy: suma dot sharma at kpitcummins dot com
CC: glibc-bugs at sources dot redhat dot com,suma dot sharma
at kpitcummins dot com
GCC build triplet: i686-pc-linux
GCC host triplet: sh4-unknown-linux
GCC target triplet: sh4-unknown-linux
http://sourceware.org/bugzilla/show_bug.cgi?id=4681
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