http://sourceware.org/bugzilla/show_bug.cgi?id=14426
Bug #: 14426
Summary: add --ignore-unresolved-symbol from NetBSD
Product: binutils
Version: 2.23 (HEAD)
URL: http://mail-index.netbsd.org/source-changes/2008/04/03
/msg004439.html
Status: NEW
Severity: normal
Priority: P2
Component: ld
AssignedTo: unassig...@sourceware.org
ReportedBy: bugme...@mailinator.com
Classification: Unclassified
Created attachment 6563
--> http://sourceware.org/bugzilla/attachment.cgi?id=6563
add --ignore-unresolved-symbol
Sometimes it's useful to leave a symbol undefined even if -z defs is used. The
symbol can still be resolved by runtime linker.
Here's an example:
// foo.c
#include <spawn.h>
#include <stdlib.h>
#include <string.h>
extern char **environ;
void foo(void) {
char *spawn_argv[] = { "/usr/bin/printenv", NULL };
char *spawn_envp[] = { (char *)malloc(strlen(environ[0])), NULL };
strcpy(spawn_envp[0], environ[0]);
posix_spawnp(NULL, spawn_argv[0], NULL, NULL, spawn_argv, spawn_envp);
}
$ gcc47 -shared -Wl,-z,defs -o foo.so foo.c -fPIC
/tmp//cc2QDr9J.o: In function `foo':
foo.c:(.text+0x1e): undefined reference to `environ'
foo.c:(.text+0x47): undefined reference to `environ'
collect2: error: ld returned 1 exit status
$ gcc47 -shared -Wl,-z,defs -o foo.so foo.c -fPIC
-Wl,--ignore-unresolved-symbol,environ
$
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