Public bug reported:
This bug found for both -ldl and -lpthread on a clean install of Ubuntu 12.04
Tried before and after updates, on my presario f700 laptop (using both 32 & 64
bit versions) and on VirtualBox using 32bit.
All produced exactly the same result.
Bug reproduced for libpthread only using the simple test application
given below - it builds and runs fine in 11.04.
Build command and output is :
-------------------------------------------------------------------------------------------------
gcc -lpthread pthread_test.c -o test
/tmp/ccJSnO1N.o: In function `main':
pthread_test.c:(.text+0xfc): undefined reference to `pthread_create'
pthread_test.c:(.text+0x119): undefined reference to `pthread_create'
pthread_test.c:(.text+0x12a): undefined reference to `pthread_join'
pthread_test.c:(.text+0x13b): undefined reference to `pthread_join'
collect2: ld returned 1 exit status
-------------------------------------------------------------------------------------------------
And the test file source is :
-------------------------------------------------------------------------------------------------
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
static int idle_count = 1000000;
void *thread_worker( void *ptr )
{
int c = 0, cc = 0;
int id = ( ptr ) ? *((int*)ptr) : 0;
while( c++ < 10 ) {
printf("Thread(%d) %d\n", id, c);
/* Slow things down by doing some make work. */
for( cc = 0; cc < idle_count; cc++ ) {;}
}
}
int main ( int argc, char **argv )
{
pthread_t thrd1, thrd2;
int id1 = 1, id2 = 2;
/* Set idle count from command line if given. */
if( argc > 1 ) {
idle_count = atoi( argv[1] );
if( idle_count < 1000 ) idle_count = 1000000;
}
printf("Idle count is [%d]\n", idle_count );
pthread_create( &thrd1, NULL, thread_worker, (void*)(& id1) );
pthread_create( &thrd2, NULL, thread_worker, (void*)(& id2) );
pthread_join( thrd1, NULL );
pthread_join( thrd2, NULL );
exit( 0 );
}
----------------------------------------------------------------------------------------------------
test file ends.
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: gcc 4:4.6.3-1ubuntu5
ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
Uname: Linux 3.2.0-24-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
Date: Sat May 19 12:44:18 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64
(20120425)
ProcEnviron:
LANGUAGE=en_GB:en
TERM=xterm
PATH=(custom, no user)
LANG=en_GB.UTF-8
SHELL=/bin/bash
SourcePackage: gcc-defaults
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: gcc-defaults (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug precise
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https://bugs.launchpad.net/bugs/1001618
Title:
gcc link step fails against -lpthread and -ldl
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