Since precise, --as-needed is the default linker option and command line
arguments order matters:
$ cat test.c
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <openssl/md5.h>
const char *string = "asdfghjklpoiuztreq";
int main()
{
unsigned char result[MD5_DIGEST_LENGTH];
MD5(string, strlen(string), result);
return EXIT_SUCCESS;
}
$ gcc -c test.c
$ ld --as-needed -lcrypto test.o
ld: warning: cannot find entry symbol _start; defaulting to 00000000004000e8
test.o: In function `main':
test.c:(.text+0x53): undefined reference to `MD5'
test.c:(.text+0x6c): undefined reference to `__stack_chk_fail'
$
vs.
$ ld --as-needed test.o -lcrypto
ld: warning: cannot find entry symbol _start; defaulting to 0000000000400300
$
** Changed in: openssl (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/900381
Title:
Missing symbols in openssl 1.0.0e-2ubuntu4
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