id	summary	reporter	owner	description	type	status	priority	component	version	resolution	keywords	cc	blockedby	blocking	reproduced	analyzed
2016	Support libopenjpeg 2.0.0	KSHawkEye		"I'm trying to compile the latest FFmpeg git with openjpeg 2.0.0 but keep getting an undefined reference to opj_version.

I have already asked for help with this issue here: [http://code.google.com/p/openjpeg/issues/detail?id=200]
Here: [http://sourceforge.net/mailarchive/message.php?msg_id=30209438]

And one of my users on my forum posted about it here: [http://ffmpeg.zeranoe.com/forum/viewtopic.php?f=5&t=674&hilit=opj_version]

I think openjpeg is failing to compile in static and is searching for some .dll file when FFmpeg tries to link to it.

Some code that ''does'' compile with opj_version is:

{{{
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <openjpeg.h>

int main(void)
{
    printf(""OPJ2 version is %s\n"",opj_version());

    return 0;
}
}}}

Though I have no idea why that succeeds, and FFmpeg's test code:

{{{
extern int opj_version();
int main(void){ opj_version(); }
}}}

fails.

This command: $ i686-w64-mingw32-nm ./libopenjp2.a | grep opj_version

Returns:
00000228 T _opj_version@0

So it looks like it is in the lib, but just keeps failing.

Openjpeg 2.0.0 compiled without error.

It also looks like FFmpeg is trying to test the lib with:

{{{
BEGIN /tmp/ffconf.ns4yWT3Y.c
    1	extern int opj_version();
    2	int main(void){ opj_version(); }
END /tmp/ffconf.ns4yWT3Y.c
i686-w64-mingw32-gcc -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -U__STRICT_ANSI__ -std=c99 -fomit-frame-pointer -c -o /tmp/ffconf.ohUKczd4.o /tmp/ffconf.ns4yWT3Y.c
i686-w64-mingw32-gcc -Wl,--as-needed -o /tmp/ffconf.hJciF3wT.exe /tmp/ffconf.ohUKczd4.o -lopenjpeg -lm -lz
/tmp/ffconf.ohUKczd4.o:ffconf.ns4yWT3Y.c:(.text+0xc): undefined reference to `opj_version'
collect2: error: ld returned 1 exit status
ERROR: libopenjpeg not found
}}}


I'm happy to provide any further needed information to help get this fixed."	enhancement	open	wish	avcodec	git-master		libopenjpeg				0	0