Public bug reported:
Testing a package build on upcoming trusty, I encountered a rather
strange issue.
Given this simple program:
#include <amqp_tcp_socket.h>
int main () {
return amqp_tcp_socket_new (0);
}
I installed "librabbitmq-dev" which provides amqp_tcp_socket.h, and then
ran "gcc -o /tmp/test -g -O2 -lrabbitmq -ldl amqp.c", which fails with:
/tmp/amqp.c:2: undefined reference to `amqp_tcp_socket_new'
collect2: error: ld returned 1 exit status
Using "gcc -v", I discovered that if /usr/lib/gcc/x86_64-linux-
gnu/4.8/collect2 was called without the --as-needed option, the program
builds fine.
I'm actually opening this bug against gcc and not librabbitmq-dev for a
reason: this simple C program builds perfectly on debian jessie/sid.
librabbitmq-dev/librabbitmq1 are exactly identical between trusty and
debian unstable. The problem also occurs when manually building
librabbitmq from the upstream source tarball.
Also, it's not just a matter of fixing my broken program or calling gcc
with some other option. This program actually is a stripped down version
of what is generated by autoconf (also same version and output on sid
and trusty, BTW) with this macro:
AC_CHECK_FUNC(amqp_tcp_socket_new, [with_amqp_tcp_socket="yes"],
[with_amqp_tcp_socket="no"])
Attaching the output of "gcc -v" on both trusty and jessie. Apart from a
couple of paths and version strings, collect2 is called with "--as-
needed" and "-z relro" on trusty but not on debian jessie.
"--as-needed" is what makes the difference between failing to build (on
trusty) or not (on jessie).
Thanks for taking a look at this !
** Affects: gcc-4.8 (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "gcc -v on trusty"
https://bugs.launchpad.net/bugs/1271468/+attachment/3954218/+files/gcc-v-trusty.txt
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https://bugs.launchpad.net/bugs/1271468
Title:
collect2 --as-needed option causes build failure
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