On 11/14/2017 01:32 PM, Neal Gompa wrote:
On Tue, Nov 14, 2017 at 2:07 AM, Florian Weimer <fweimer@xxxxxxxxxx> wrote:
On 11/14/2017 03:54 AM, Philip Kovacs wrote:
One concern is that -Wl,--as-needed requires greater accuracy with the
ordering of objects and
libraries as you link. Also, if a package uses a library indirectly,
i.e. A uses C via B: A -> B -> C,--as-needed will peel away C and break A
unless A explicitly mentions its need for C.
I think ld no longer links against symbols in indirect dependencies.
#include <openssl/evp.h>
int
main()
{
return (int) &EVP_rc4;
}
/usr/bin/ld: /tmp/ccV4cmYY.o: undefined reference to symbol
'EVP_rc4@@OPENSSL_1_1_0'
//usr/lib64/libcrypto.so.1.1: error adding symbols: DSO missing from command
line
collect2: error: ld returned 1 exit status
I've only seen this with OpenSSL, so I think it's specific to that library.
Implicit linking is not openssl specific at all, this is fairly old news
by now as this change occurred in Fedora 13:
https://fedoraproject.org/wiki/Features/ChangeInImplicitDSOLinking
https://fedoraproject.org/wiki/UnderstandingDSOLinkChange
- Panu -
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