Package: openal-dev
Version: 1:0.0.8-1
Severity: important||
My system details:
[EMAIL PROTECTED]:~$ uname -a
Linux harima 2.6.15-1-k7 #2 Mon Mar 6 15:42:39 UTC 2006 i686 GNU/Linux
The issue is that a library flag, -lalut is missing from the printout of
openal-config --libs. Without this flag, any attempts trying to compile
code that uses alut calls will fail with undefined reference errors. It
is no where documented in the OpenAL or ALUT documentation, nor in the
libalut-dev documentation or any other Debian documentation (AFAIK). The
libalut-dev package, version 1.0.1-1, is affected by this bug.
http://www.openal.org/openal_webstf/specs/alut.html#CompilingLinking
These instructions state that running the following two commands will
tell you the necessary flags needed to build OpenAL (which may
optionally use ALUT) programs:
openal-config --cflags
openal-config --libs
On my machine:
[EMAIL PROTECTED]:~$ openal-config --cflags
[EMAIL PROTECTED]:~$ openal-config --libs
-lopenal
However gcc could not compile the simple test program below, taken from
http://www.openal.org/openal_webstf/specs/alut.html
#include <stdlib.h>
#include <AL/alut.h>
int
main (int argc, char **argv)
{
ALuint helloBuffer, helloSource;
alutInit (&argc, argv);
helloBuffer = alutCreateBufferHelloWorld ();
alGenSources (1, &helloSource);
alSourcei (helloSource, AL_BUFFER, helloBuffer);
alSourcePlay (helloSource);
alutSleep (1);
alutExit ();
return EXIT_SUCCESS;
}
Proof of this linking error, and the need for the -lalut flag, follow
below. First I attempted to compile with no flags. Then I used only the
-lopenal flag (which openal-config reports that that is all I need), and
finally I include the -lalut flag, after which the program successfully
compiles and executes.
[EMAIL PROTECTED]:~/dev/allacrost$ gcc audio_test.c
/tmp/ccOtMkpQ.o: In function `main':audio_test.c:(.text+0x2a): undefined
reference to `alutInit'
:audio_test.c:(.text+0x2f): undefined reference to
`alutCreateBufferHelloWorld'
:audio_test.c:(.text+0x45): undefined reference to `alGenSources'
:audio_test.c:(.text+0x5f): undefined reference to `alSourcei'
:audio_test.c:(.text+0x6a): undefined reference to `alSourcePlay'
:audio_test.c:(.text+0x77): undefined reference to `alutSleep'
:audio_test.c:(.text+0x7c): undefined reference to `alutExit'
collect2: ld returned 1 exit status
[EMAIL PROTECTED]:~/dev/allacrost$ gcc audio_test.c -lopenal
/tmp/ccoNWcDP.o: In function `main':audio_test.c:(.text+0x2a): undefined
reference to `alutInit'
:audio_test.c:(.text+0x2f): undefined reference to
`alutCreateBufferHelloWorld'
:audio_test.c:(.text+0x77): undefined reference to `alutSleep'
:audio_test.c:(.text+0x7c): undefined reference to `alutExit'
collect2: ld returned 1 exit status
[EMAIL PROTECTED]:~/dev/allacrost$ gcc audio_test.c -lopenal -lalut
[EMAIL PROTECTED]:~/dev/allacrost$ ./a.out
Recommended solution: Add -lalut to the output of openal-config, as the
OpenAL standard states that it should be present. It should be an easy
fix. :)
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