test.c ---------------------------------
#include <string.h>
#include <malloc.h>
int main()
{
char *s = strdup( "foo" );
free( s );
return 0;
}
compile in/out -------------------------
$ gcc -Wall -ansi test.c
test.c: In function main:
test.c:6: warning: implicit declaration of function strdup
test.c:6: warning: initialization makes pointer from integer without a cast
gcc -v ---------------------------------
Using built-in specs.
Target: i386-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--enable-checking=release --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-libgcj-multifile
--enable-languages=c,c++,objc,java,f95,ada --enable-java-awt=gtk
--with-java-home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre
--host=i386-redhat-linux
Thread model: posix
gcc version 4.0.2 20051125 (Red Hat 4.0.2-8)
test.i ---------------------------------
# 1 "test.c"
# 1 "<built-in>"
# 1 "<command line>"
# 1 "test.c"
# 1 "/usr/include/string.h" 1 3 4
# 26 "/usr/include/string.h" 3 4
# 1 "/usr/include/features.h" 1 3 4
# 314 "/usr/include/features.h" 3 4
# 1 "/usr/include/sys/cdefs.h" 1 3 4
# 315 "/usr/include/features.h" 2 3 4
# 337 "/usr/include/features.h" 3 4
# 1 "/usr/include/gnu/stubs.h" 1 3 4
# 1 "/usr/include/bits/wordsize.h" 1 3 4
# 5 "/usr/include/gnu/stubs.h" 2 3 4
# 1 "/usr/include/gnu/stubs-32.h" 1 3 4
# 8 "/usr/include/gnu/stubs.h" 2 3 4
# 338 "/usr/include/features.h" 2 3 4
# 27 "/usr/include/string.h" 2 3 4
# 1 "/usr/lib/gcc/i386-redhat-linux/4.0.2/include/stddef.h" 1 3 4
# 214 "/usr/lib/gcc/i386-redhat-linux/4.0.2/include/stddef.h" 3 4
typedef unsigned int size_t;
# 34 "/usr/include/string.h" 2 3 4
extern void *memcpy (void *__restrict __dest,
__const void *__restrict __src, size_t __n)
__attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1, 2)));
extern void *memmove (void *__dest, __const void *__src, size_t __n)
__attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1, 2)));
# 57 "/usr/include/string.h" 3 4
extern void *memset (void *__s, int __c, size_t __n) __attribute__
((__nothrow__)) __attribute__ ((__nonnull__ (1)));
extern int memcmp (__const void *__s1, __const void *__s2, size_t __n)
__attribute__ ((__nothrow__)) __attribute__ ((__pure__)) __attribute__
((__nonnull__ (1, 2)));
extern void *memchr (__const void *__s, int __c, size_t __n)
__attribute__ ((__nothrow__)) __attribute__ ((__pure__)) __attribute__
((__nonnull__ (1)));
# 82 "/usr/include/string.h" 3 4
extern char *strcpy (char *__restrict __dest, __const char *__restrict __src)
__attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1, 2)));
extern char *strncpy (char *__restrict __dest,
__const char *__restrict __src, size_t __n)
__attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1, 2)));
extern char *strcat (char *__restrict __dest, __const char *__restrict __src)
__attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1, 2)));
extern char *strncat (char *__restrict __dest, __const char *__restrict __src,
size_t __n) __attribute__ ((__nothrow__)) __attribute__ ((__nonnull__
(1, 2)));
extern int strcmp (__const char *__s1, __const char *__s2)
__attribute__ ((__nothrow__)) __attribute__ ((__pure__)) __attribute__
((__nonnull__ (1, 2)));
extern int strncmp (__const char *__s1, __const char *__s2, size_t __n)
__attribute__ ((__nothrow__)) __attribute__ ((__pure__)) __attribute__
((__nonnull__ (1, 2)));
extern int strcoll (__const char *__s1, __const char *__s2)
__attribute__ ((__nothrow__)) __attribute__ ((__pure__)) __attribute__
((__nonnull__ (1, 2)));
extern size_t strxfrm (char *__restrict __dest,
__const char *__restrict __src, size_t __n)
__attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (2)));
# 165 "/usr/include/string.h" 3 4
extern char *strchr (__const char *__s, int __c)
__attribute__ ((__nothrow__)) __attribute__ ((__pure__)) __attribute__
((__nonnull__ (1)));
extern char *strrchr (__const char *__s, int __c)
__attribute__ ((__nothrow__)) __attribute__ ((__pure__)) __attribute__
((__nonnull__ (1)));
# 181 "/usr/include/string.h" 3 4
extern size_t strcspn (__const char *__s, __const char *__reject)
__attribute__ ((__nothrow__)) __attribute__ ((__pure__)) __attribute__
((__nonnull__ (1, 2)));
extern size_t strspn (__const char *__s, __const char *__accept)
__attribute__ ((__nothrow__)) __attribute__ ((__pure__)) __attribute__
((__nonnull__ (1, 2)));
extern char *strpbrk (__const char *__s, __const char *__accept)
__attribute__ ((__nothrow__)) __attribute__ ((__pure__)) __attribute__
((__nonnull__ (1, 2)));
extern char *strstr (__const char *__haystack, __const char *__needle)
__attribute__ ((__nothrow__)) __attribute__ ((__pure__)) __attribute__
((__nonnull__ (1, 2)));
extern char *strtok (char *__restrict __s, __const char *__restrict __delim)
__attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (2)));
extern char *__strtok_r (char *__restrict __s,
__const char *__restrict __delim,
char **__restrict __save_ptr)
__attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (2, 3)));
# 240 "/usr/include/string.h" 3 4
extern size_t strlen (__const char *__s)
__attribute__ ((__nothrow__)) __attribute__ ((__pure__)) __attribute__
((__nonnull__ (1)));
# 254 "/usr/include/string.h" 3 4
extern char *strerror (int __errnum) __attribute__ ((__nothrow__));
# 288 "/usr/include/string.h" 3 4
extern void __bzero (void *__s, size_t __n) __attribute__ ((__nothrow__))
__attribute__ ((__nonnull__ (1)));
# 426 "/usr/include/string.h" 3 4
# 2 "test.c" 2
# 1 "/usr/include/malloc.h" 1 3 4
# 24 "/usr/include/malloc.h" 3 4
# 1 "/usr/lib/gcc/i386-redhat-linux/4.0.2/include/stddef.h" 1 3 4
# 152 "/usr/lib/gcc/i386-redhat-linux/4.0.2/include/stddef.h" 3 4
typedef int ptrdiff_t;
# 326 "/usr/lib/gcc/i386-redhat-linux/4.0.2/include/stddef.h" 3 4
typedef long int wchar_t;
# 25 "/usr/include/malloc.h" 2 3 4
# 46 "/usr/include/malloc.h" 3 4
extern void *malloc (size_t __size) __attribute__ ((__nothrow__)) __attribute__
((__malloc__)) ;
extern void *calloc (size_t __nmemb, size_t __size) __attribute__
((__nothrow__))
__attribute__ ((__malloc__)) ;
extern void *realloc (void *__ptr, size_t __size) __attribute__ ((__nothrow__))
__attribute__ ((__malloc__)) __attribute__ ((__warn_unused_result__));
extern void free (void *__ptr) __attribute__ ((__nothrow__));
extern void cfree (void *__ptr) __attribute__ ((__nothrow__));
extern void *memalign (size_t __alignment, size_t __size) __attribute__
((__nothrow__))
__attribute__ ((__malloc__)) ;
extern void *valloc (size_t __size) __attribute__ ((__nothrow__))
__attribute__ ((__malloc__)) ;
extern void * pvalloc (size_t __size) __attribute__ ((__nothrow__))
__attribute__ ((__malloc__)) ;
extern void *(*__morecore) (ptrdiff_t __size);
extern void *__default_morecore (ptrdiff_t __size) __attribute__
((__nothrow__))
__attribute__ ((__malloc__));
struct mallinfo {
int arena;
int ordblks;
int smblks;
int hblks;
int hblkhd;
int usmblks;
int fsmblks;
int uordblks;
int fordblks;
int keepcost;
};
extern struct mallinfo mallinfo (void) __attribute__ ((__nothrow__));
# 128 "/usr/include/malloc.h" 3 4
extern int mallopt (int __param, int __val) __attribute__ ((__nothrow__));
extern int malloc_trim (size_t __pad) __attribute__ ((__nothrow__));
extern size_t malloc_usable_size (void *__ptr) __attribute__ ((__nothrow__));
extern void malloc_stats (void) __attribute__ ((__nothrow__));
extern void *malloc_get_state (void) __attribute__ ((__nothrow__));
extern int malloc_set_state (void *__ptr) __attribute__ ((__nothrow__));
extern void (*__malloc_initialize_hook) (void);
extern void (*__free_hook) (void *__ptr, __const void *);
extern void *(*__malloc_hook) (size_t __size, __const void *);
extern void *(*__realloc_hook) (void *__ptr, size_t __size, __const void *);
extern void *(*__memalign_hook) (size_t __alignment, size_t __size, __const
void *);
extern void (*__after_morecore_hook) (void);
extern void __malloc_check_init (void) __attribute__ ((__nothrow__));
# 3 "test.c" 2
int main()
{
char *s = strdup( "foo" );
free( s );
return 0;
}
--
Summary: strdup "implicit declaration" warning when using -ansi
Product: gcc
Version: 4.0.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: parcour at gmail dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26386
