Mdthbs

When I run the ./configure command in ffmpeg source directory I get this error:

gcc is unable to create an executable file. If gcc is a cross-compiler, use the --enable-cross-compile option. Only do this if you know what cross compiling means. C compiler test failed.



If you think configure made a mistake, make sure you are using the latest version from Git.  If the latest version fails, report the problem to the ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net. Include the log file "config.log" produced by configure as this will help solving the problem.

in config.log:

check_ld cc

check_cc

BEGIN /tmp/ffconf.xECiIX7z.c

    1   int main(void){ return 0; }

END /tmp/ffconf.xECiIX7z.c

gcc -c -o /tmp/ffconf.xsCaoMWN.o /tmp/ffconf.xECiIX7z.c

gcc -o /tmp/ffconf.ApzYq7NQ /tmp/ffconf.xsCaoMWN.o

/usr/lib/gcc/x86_64-linux-gnu/4.6.1/../../../x86_64-linux-gnu/crt1.o: In function `_start':

(.text+0x12): undefined reference to `__libc_csu_fini'

/usr/lib/gcc/x86_64-linux-gnu/4.6.1/../../../x86_64-linux-gnu/crt1.o: In function `_start':

(.text+0x19): undefined reference to `__libc_csu_init'

collect2: ld returned 1 exit status

C compiler test failed.

What's wrong? What should I do?

Your libc installation is incomplete or broken somehow. You should say what OS you use... the easiest fix is probably to reinstall the packages that comprise the libc.

Or if you are really interested in finding out exactly which part of it is broken, here are some tips:

On a typical glibc installation, the references to __libc_csu_init and __libc_csu_fini will be resolved by finding them in /usr/lib/libc_nonshared.a which you can check as follows:

$ nm /usr/lib/libc_nonshared.a | egrep '__libc_csu_(init|fini)'

0000000000000000 T __libc_csu_fini

0000000000000010 T __libc_csu_init

The use of /usr/lib/libc_nonshared.a will be triggered by linking to /usr/lib/libc.so (which is a text file, not an actual shared object). You can check that like this:

There may be some other stuff in it too. You can check that with

$ less /usr/lib/libc.so

[...]

GROUP ( /lib/libc.so.6 /usr/lib/libc_nonshared.a )

/usr/lib/libc.so will be used by the linker to satisfy the -lc requirement, which you can check like this:

$ ld --verbose -lc

[... lots of stuff ...]

opened script file /usr/lib64/libc.so

attempt to open /lib/libc.so.6 succeeded

/lib/libc.so.6

attempt to open /usr/lib/libc_nonshared.a succeeded

That means you don't have the necessary software to compile C code.

Run this:

apt-get install build-essential

You also want the build dependencies for ffmpeg:

apt-get build-dep ffmpeg

Then try again.

If you may get an error while installing FFMPEG on centOS 6.5,

create repo : /etc/yum.repos.d/dag.repo

# vi  /etc/yum.repos.d/dag.repo

add below lines into it,

[dag]

name=DAG RPM Repository

baseurl=http://apt.sw.be/redhat/el$releasever/en/$basearch/dag

gpgcheck=1

enabled=1

GPG key for DAG, run the below command,

# rpm --import http://apt.sw.be/RPM-GPG-KEY.dag.txt

Now update and install ffmpeg,

# yum update

# yum install ffmpeg ffmpeg-devel ffmpeg-libpostproc

I know this is an old question, but I had a problem with similar symptoms recently while compiling ffmpeg on my workstation. What caused the problem was passing several flags to enable the opus and vpx codecs, which appears to influence the flags passed into gcc. In my case these libraries weren't present yet and the ./configure was detecting that gcc didn't produce an executable with those flags. In this case the error gcc is unable too create an executable was insufficient.