6c4798d3f0
Disable a couple of compilation warnings (which are treated as errors)
on strlcpy() definition and declaration, allowing users to compile perf
and kernel (objtool) when:
1. glibc have strlcpy() (such as in ALT Linux since 2004) objtool and
perf build fails with this (in gcc):
In file included from exec-cmd.c:3:
tools/include/linux/string.h:20:15: error: redundant redeclaration of ‘strlcpy’ [-Werror=redundant-decls]
20 | extern size_t strlcpy(char *dest, const char *src, size_t size);
2. clang ignores `-Wredundant-decls', but produces another warning when
building perf:
CC util/string.o
../lib/string.c:99:8: error: attribute declaration must precede definition [-Werror,-Wignored-attributes]
size_t __weak strlcpy(char *dest, const char *src, size_t size)
../../tools/include/linux/compiler.h:66:34: note: expanded from macro '__weak'
# define __weak __attribute__((weak))
/usr/include/bits/string_fortified.h:151:8: note: previous definition is here
__NTH (strlcpy (char *__restrict __dest, const char *__restrict __src,
Committer notes:
The
#pragma GCC diagnostic
directive was introduced in gcc 4.6, so check for that as well.
Fixes: ce99091 ("perf tools: Move strlcpy() from perf to tools/lib/string.c")
Fixes: 0215d59 ("tools lib: Reinstate strlcpy() header guard with __UCLIBC__")
Resolves: https://bugzilla.kernel.org/show_bug.cgi?id=118481
Signed-off-by: Vitaly Chikunov <vt@altlinux.org>
Reviewed-by: Dmitry Levin <ldv@altlinux.org>
Cc: Dmitry Levin <ldv@altlinux.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: kbuild test robot <lkp@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: stable@vger.kernel.org
Cc: Vineet Gupta <vineet.gupta1@synopsys.com>
Link: http://lore.kernel.org/lkml/20191224172029.19690-1-vt@altlinux.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _TOOLS_LINUX_STRING_H_
|
|
#define _TOOLS_LINUX_STRING_H_
|
|
|
|
#include <linux/types.h> /* for size_t */
|
|
#include <string.h>
|
|
|
|
void *memdup(const void *src, size_t len);
|
|
|
|
char **argv_split(const char *str, int *argcp);
|
|
void argv_free(char **argv);
|
|
|
|
int strtobool(const char *s, bool *res);
|
|
|
|
/*
|
|
* glibc based builds needs the extern while uClibc doesn't.
|
|
* However uClibc headers also define __GLIBC__ hence the hack below
|
|
*/
|
|
#if defined(__GLIBC__) && !defined(__UCLIBC__)
|
|
// pragma diagnostic was introduced in gcc 4.6
|
|
#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)
|
|
#pragma GCC diagnostic push
|
|
#pragma GCC diagnostic ignored "-Wredundant-decls"
|
|
#endif
|
|
extern size_t strlcpy(char *dest, const char *src, size_t size);
|
|
#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)
|
|
#pragma GCC diagnostic pop
|
|
#endif
|
|
#endif
|
|
|
|
char *str_error_r(int errnum, char *buf, size_t buflen);
|
|
|
|
char *strreplace(char *s, char old, char new);
|
|
|
|
/**
|
|
* strstarts - does @str start with @prefix?
|
|
* @str: string to examine
|
|
* @prefix: prefix to look for.
|
|
*/
|
|
static inline bool strstarts(const char *str, const char *prefix)
|
|
{
|
|
return strncmp(str, prefix, strlen(prefix)) == 0;
|
|
}
|
|
|
|
extern char * __must_check skip_spaces(const char *);
|
|
|
|
extern char *strim(char *);
|
|
|
|
#endif /* _TOOLS_LINUX_STRING_H_ */
|