[Libav-user] compiling ffmpeg with -fPIC

[Dayana]

Hi!!! Im developing an aplication using libavcodec, libavformat and
libavutil. Im trying to make a shared library and for that I have to get
libavs compiled with -fPIC ... I was trying to do it by setting
--enable-pic in the configure file, however Im still have the same error:

/usr/local/lib/libavcodec.a(lpc_mmx.o): relocation R_X86_64_PC32 against
symbol `ff_pd_1' can not be used when making a shared object; recompile
with -fPIC


could somebody give me a hint please??

:) dayana
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[Carl Eugen Hoyos]

Dayana <dribas@...> writes:

> Im trying to make a shared library and for that I
> have to get libavs compiled with -fPIC ... I was
> trying to do it by setting --enable-pic in the
> configure file, however Im still have the same error:
>
> /usr/local/lib/libavcodec.a(lpc_mmx.o)

You are (still) trying to link a static library -
/usr/local/lib/libavcodec.a - with a shared object
compiled with -fpic which cannot work.

Carl Eugen

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[Ratin-2]

On Wed, May 1, 2013 at 7:41 AM, Dayana <[hidden email]> wrote:

Hi!!! Im developing an aplication using libavcodec, libavformat and libavutil. Im trying to make a shared library and for that I have to get libavs compiled with -fPIC ... I was trying to do it by setting --enable-pic in the configure file, however Im still have the same error:

/usr/local/lib/libavcodec.a(lpc_mmx.o): relocation R_X86_64_PC32 against symbol `ff_pd_1' can not be used when making a shared object; recompile with -fPIC


could somebody give me a hint please??

:) dayana

./configure --extra-cflags="-fPIC"  

 

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[Ratin-2]

On Wed, May 1, 2013 at 8:00 AM, Ratin <[hidden email]> wrote:

On Wed, May 1, 2013 at 7:41 AM, Dayana <[hidden email]> wrote:

Hi!!! Im developing an aplication using libavcodec, libavformat and libavutil. Im trying to make a shared library and for that I have to get libavs compiled with -fPIC ... I was trying to do it by setting --enable-pic in the configure file, however Im still have the same error:

/usr/local/lib/libavcodec.a(lpc_mmx.o): relocation R_X86_64_PC32 against symbol `ff_pd_1' can not be used when making a shared object; recompile with -fPIC


could somebody give me a hint please??

:) dayana

./configure --extra-cflags="-fPIC"  

assuming you do --enable-shared option, and not statically linking

 

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[Carl Eugen Hoyos]

Ratin <ratin3@...> writes:

> ./configure --extra-cflags="-fPIC"

This is not a good idea since an equivalent
option exists (that may set additional settings).

Carl Eugen

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[Dayana]

First of all thanks a lot!!

./configure --extra-cflags="-fPIC"  
assuming you do --enable-shared option, and not statically linking


You are (still) trying to link a static library - 
/usr/local/lib/libavcodec.a - with a shared object 
compiled with -fpic which cannot work.

>> Im only did ./configure, make, make install, for obtaining the libavcodec.a, that is that Im using for creating mi libx.so 

On 05/01/2013 11:03 AM, Ratin wrote:

On Wed, May 1, 2013 at 8:00 AM, Ratin <[hidden email]> wrote:

On Wed, May 1, 2013 at 7:41 AM, Dayana <[hidden email]> wrote:

Hi!!! Im developing an aplication using libavcodec, libavformat and libavutil. Im trying to make a shared library and for that I have to get libavs compiled with -fPIC ... I was trying to do it by setting --enable-pic in the configure file, however Im still have the same error:

/usr/local/lib/libavcodec.a(lpc_mmx.o): relocation R_X86_64_PC32 against symbol `ff_pd_1' can not be used when making a shared object; recompile with -fPIC


could somebody give me a hint please??

:) dayana

./configure --extra-cflags="-fPIC"  

assuming you do --enable-shared option, and not statically linking

 

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[Ratin-2]

On Wed, May 1, 2013 at 8:04 AM, Carl Eugen Hoyos <[hidden email]> wrote:

Ratin <ratin3@...> writes:

> ./configure --extra-cflags="-fPIC"

This is not a good idea since an equivalent
option exists (that may set additional settings).

Carl Eugen

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Agreed, if the equivalent option works.

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[Dayana]

I tried with > ./configure --extra-cflags="-fPIC" and I still have the same error:

/usr/local/lib/libavcodec.a(lpc_mmx.o): relocation R_X86_64_PC32 against symbol `ff_pd_1' can not be used when making a shared object; recompile with -fPIC

:(




On 05/01/2013 12:05 PM, Ratin wrote:

On Wed, May 1, 2013 at 8:04 AM, Carl Eugen Hoyos <[hidden email]> wrote:

Ratin [hidden email] writes:

> ./configure --extra-cflags="-fPIC"

This is not a good idea since an equivalent
option exists (that may set additional settings).

Carl Eugen

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Agreed, if the equivalent option works.

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[Gavin Kinsey]

On Wednesday 01 May 2013 15:41:48 Dayana wrote:
> Hi!!! Im developing an aplication using libavcodec, libavformat and
> libavutil. Im trying to make a shared library and for that I have to get
> libavs compiled with -fPIC ... I was trying to do it by setting
> --enable-pic in the configure file, however Im still have the same error:
>
> /usr/local/lib/libavcodec.a(lpc_mmx.o): relocation R_X86_64_PC32 against
> symbol `ff_pd_1' can not be used when making a shared object; recompile
> with -fPIC

If you are trying to combine several ffmpeg libraries into a single shared
library as I have seen some apps try to do then you need to use the
following linker flag on the final library build step.

-shared -Wl,-Bsymbolic

--
Gavin Kinsey
AD Holdings Plc


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[Dayana]

Hi Gavin!!

I set

-shared -Wl,-Bsymbolic

in the linker flags of my library, that depends of libavcodec, libavutil, libavformat...

However when Im going to call av_register_all(); I get the same error:
/usr/local/lib/libavcodec.a(lpc_mmx.o): relocation R_X86_64_PC32 against
symbol `ff_pd_1' can not be used when making a shared object; recompile
with -fPIC

///////

I think that I have to set the flag -fPIC for compiling the libavcodec, libavutil, libavformat, so I added: enable pic , in the configure file of the ffmpeg project:

# OS specific
case $target_os in
linux)
         add_cppflags -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600
        enable pic
        enable dv1394


Therefore when ffmpeg is compiled, libavcodec, libavutil, libavformat were compiled with -fPIC.... then when should be ok If I want to use them in my libx.so ... but It is not, I have the same error:

/usr/local/lib/libavcodec.a(lpc_mmx.o): relocation R_X86_64_PC32 against
symbol `ff_pd_1' can not be used when making a shared object; recompile
with -fPIC


I dont know wish is the problem with ffmpeg and -fPIC...

   







On 05/03/2013 06:32 AM, Gavin Kinsey wrote:

> On Wednesday 01 May 2013 15:41:48 Dayana wrote:
>> Hi!!! Im developing an aplication using libavcodec, libavformat and
>> libavutil. Im trying to make a shared library and for that I have to get
>> libavs compiled with -fPIC ... I was trying to do it by setting
>> --enable-pic in the configure file, however Im still have the same error:
>>
>> /usr/local/lib/libavcodec.a(lpc_mmx.o): relocation R_X86_64_PC32 against
>> symbol `ff_pd_1' can not be used when making a shared object; recompile
>> with -fPIC
> If you are trying to combine several ffmpeg libraries into a single shared
> library as I have seen some apps try to do then you need to use the
> following linker flag on the final library build step.
>
> -shared -Wl,-Bsymbolic
>

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[Ratin-2]

On Mon, May 6, 2013 at 6:18 AM, Dayana <[hidden email]> wrote:

Hi Gavin!!

I set

-shared -Wl,-Bsymbolic

in the linker flags of my library, that depends of libavcodec, libavutil, libavformat...

However when Im going to call av_register_all(); I get the same error:

/usr/local/lib/libavcodec.a(lpc_mmx.o): relocation R_X86_64_PC32 against
symbol `ff_pd_1' can not be used when making a shared object; recompile
with -fPIC

///////

I think that I have to set the flag -fPIC for compiling the libavcodec, libavutil, libavformat, so I added: enable pic , in the configure file of the ffmpeg project:

# OS specific
case $target_os in
linux)
        add_cppflags -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600
        enable pic
        enable dv1394


Therefore when ffmpeg is compiled, libavcodec, libavutil, libavformat were compiled with -fPIC.... then when should be ok If I want to use them in my libx.so ... but It is not, I have the same error:

/usr/local/lib/libavcodec.a(lpc_mmx.o): relocation R_X86_64_PC32 against
symbol `ff_pd_1' can not be used when making a shared object; recompile
with -fPIC

I dont know wish is the problem with ffmpeg and -fPIC...

 

I am a little confused, do you get this error when you are trying to use libavcodec.a into another of your projects or during compilation of libavcodec itself? In the latter case why are you building a static library (i.e. libavcodec.a instead of a libavcodec.so ) ? You need to build libavcodec as a shared object library by specifying --enable-shared --disable-static  or something to that effect

 

On 05/03/2013 06:32 AM, Gavin Kinsey wrote:

On Wednesday 01 May 2013 15:41:48 Dayana wrote:

Hi!!! Im developing an aplication using libavcodec, libavformat and
libavutil. Im trying to make a shared library and for that I have to get
libavs compiled with -fPIC ... I was trying to do it by setting
--enable-pic in the configure file, however Im still have the same error:

/usr/local/lib/libavcodec.a(lpc_mmx.o): relocation R_X86_64_PC32 against
symbol `ff_pd_1' can not be used when making a shared object; recompile
with -fPIC

If you are trying to combine several ffmpeg libraries into a single shared
library as I have seen some apps try to do then you need to use the
following linker flag on the final library build step.

-shared -Wl,-Bsymbolic

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[Dayana]

I am a little confused, do you get this error when you are trying to use libavcodec.a into another of your projects or during compilation of libavcodec itself? In the latter case why are you building a static library (i.e. libavcodec.a instead of a libavcodec.so ) ? You need to build libavcodec as a shared object library by specifying --enable-shared --disable-static  or something to that effect


I get the error: /usr/local/lib/libavcodec.a(lpc_mmx.o): relocation R_X86_64_PC32 against symbol `ff_pd_1' can not be used when making a shared object; recompile
with -fPIC

when Im trying to use the function av_register_all(), belonging to libavcodec, in a library that I am programing (libmylibrary.so)

For compiling libavcodec, I am doing ./configure, make, make install in the directory of ffmpeg-0.11.1, wish contains libavcodec, libavutil, etc... the result of this is libavcodec.a, libavutil.a, etc...

:)





On 05/06/2013 10:56 AM, Ratin wrote:

On Mon, May 6, 2013 at 6:18 AM, Dayana <[hidden email]> wrote:

Hi Gavin!!

I set

-shared -Wl,-Bsymbolic

in the linker flags of my library, that depends of libavcodec, libavutil, libavformat...

However when Im going to call av_register_all(); I get the same error:

/usr/local/lib/libavcodec.a(lpc_mmx.o): relocation R_X86_64_PC32 against
symbol `ff_pd_1' can not be used when making a shared object; recompile
with -fPIC

///////

I think that I have to set the flag -fPIC for compiling the libavcodec, libavutil, libavformat, so I added: enable pic , in the configure file of the ffmpeg project:

# OS specific
case $target_os in
linux)
        add_cppflags -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600
        enable pic
        enable dv1394


Therefore when ffmpeg is compiled, libavcodec, libavutil, libavformat were compiled with -fPIC.... then when should be ok If I want to use them in my libx.so ... but It is not, I have the same error:

/usr/local/lib/libavcodec.a(lpc_mmx.o): relocation R_X86_64_PC32 against
symbol `ff_pd_1' can not be used when making a shared object; recompile
with -fPIC

I dont know wish is the problem with ffmpeg and -fPIC...

 

I am a little confused, do you get this error when you are trying to use libavcodec.a into another of your projects or during compilation of libavcodec itself? In the latter case why are you building a static library (i.e. libavcodec.a instead of a libavcodec.so ) ? You need to build libavcodec as a shared object library by specifying --enable-shared --disable-static  or something to that effect

 

On 05/03/2013 06:32 AM, Gavin Kinsey wrote:

On Wednesday 01 May 2013 15:41:48 Dayana wrote:

Hi!!! Im developing an aplication using libavcodec, libavformat and
libavutil. Im trying to make a shared library and for that I have to get
libavs compiled with -fPIC ... I was trying to do it by setting
--enable-pic in the configure file, however Im still have the same error:

/usr/local/lib/libavcodec.a(lpc_mmx.o): relocation R_X86_64_PC32 against
symbol `ff_pd_1' can not be used when making a shared object; recompile
with -fPIC

If you are trying to combine several ffmpeg libraries into a single shared
library as I have seen some apps try to do then you need to use the
following linker flag on the final library build step.

-shared -Wl,-Bsymbolic

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[Chung Leong]

> Date: Mon, 6 May 2013 09:18:58 -0400

> From: [hidden email]

> To: [hidden email]
> Subject: Re: [Libav-user] compiling ffmpeg with -fPIC
>
> Hi Gavin!!
>
> I set
>
> -shared -Wl,-Bsymbolic
>
> in the linker flags of my library, that depends of libavcodec, libavutil, libavformat...
>
> However when Im going to call av_register_all(); I get the same error:
> /usr/local/lib/libavcodec.a(lpc_mmx.o): relocation R_X86_64_PC32 against
> symbol `ff_pd_1' can not be used when making a shared object; recompile
> with -fPIC
>
> ///////
>
> I think that I have to set the flag -fPIC for compiling the libavcodec, libavutil, libavformat, so I added: enable pic , in the configure file of the ffmpeg project:
>
> # OS specific
> case $target_os in
> linux)
> add_cppflags -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600
> enable pic
> enable dv1394
>
>
> Therefore when ffmpeg is compiled, libavcodec, libavutil, libavformat were compiled with -fPIC.... then when should be ok If I want to use them in my libx.so ... but It is not, I have the same error:
>
> /usr/local/lib/libavcodec.a(lpc_mmx.o): relocation R_X86_64_PC32 against
> symbol `ff_pd_1' can not be used when making a shared object; recompile
> with -fPIC
>
>
> I dont know wish is the problem with ffmpeg and -fPIC...

Hello, I'm new to the list.

If you want to link objects in a static library into a shared library, I think you need to compile the static library using -mcmode=large. As .so can be loaded at an address above 4gig, 32-bit code pointers don't work. The linker can neither create 64-bit relocations from 32-bit relocations or change function calls from non-PIC to PIC. So it throws an error.

Someone correct me if I'm wrong.

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[Chung Leong]

Let me correct myself. The problematic symbol in the situation here is "ff_pd_1", a global variable. It's declared with the attribute visibility("hidden"). The symbol isn't exported. Knowing this, gcc apparently doesn't generate PIC code for accessing it even when you add -fPIC.

By default, gcc assumes your executable isn't going to be larger than 2 gig. Executables are normally loaded within the first 2 gig of the address space, so any global variable ought to be reachable by a 32-bit address.  This doesn't work for shared libraries. The address needs to be 64-bit.

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[fzanelli]

Hi,
did you solve the problem?
I experienced it when I was trying to include static ffmpeg libraries (libavcodec.a, libavformat.a ...) in my shared lib (mylib.so) on a 64 bit linux platform, but I don't know how to solve, can you help me please?

Il 01/05/2013 16:41, Dayana ha scritto:

Hi!!! Im developing an aplication using libavcodec, libavformat and
libavutil. Im trying to make a shared library and for that I have to get
libavs compiled with -fPIC ... I was trying to do it by setting
--enable-pic in the configure file, however Im still have the same error:

/usr/local/lib/libavcodec.a(lpc_mmx.o): relocation R_X86_64_PC32 against
symbol `ff_pd_1' can not be used when making a shared object; recompile
with -fPIC


could somebody give me a hint please??

:) dayana
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[Carl Eugen Hoyos]

Zanelli Franco <fzanelli@...> writes:

> I experienced it when I was trying to include static ffmpeg
> libraries (libavcodec.a, libavformat.a ...) in my shared lib
> (mylib.so) on a 64 bit linux platform, but I don't know how to
> solve, can you help me please?

Could you explain (FFmpeg version, configure line, etc.)
how to reproduce your problem? That may allow us to help.

Carl Eugen

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[fzanelli]

Ok,
I'd like to make a shared library called mylib.so that include static ffmpeg libraries libavcodec.a libavformat.a ..etc. in order to have just one shared library
I'm working on a linux machine 64 bit (ubuntu 12.04).
I've built ffmpeg libraries from ffmpeg 2.0.1 sources with this configuration:
--prefix="$HOME/ffmpeg_build"   --extra-cflags="-m64 -I$HOME/ffmpeg_build/include" --extra-ldflags="-L$HOME/ffmpeg_build/lib"   --bindir="$HOME/bin" --extra-libs="-ldl" --enable-gpl --enable-libmp3lame --enable-libx264 --enable-pic

When I link the avlibs in mine, with this command:
gcc -m64    -o mylib.so  -L../ffmpeg_build/lib /home/uts/ffmpeg_build/lib/libavcodec.a -Wl,-R. -shared -s -fPIC

I always get this error:
/usr/bin/ld: /home/uts/ffmpeg_build/lib/libavcodec.a(deinterlace.o): relocation R_X86_64_PC32 against symbol `ff_pw_4' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: final link failed: Bad value

The same procedure on a x86 linux platform succeded.
This is the same problem experienced from Dayana in this mailing list the 1st may 2013, I read the answers but they were not helpful
Can you help me please?

thank you



Il 28/10/2013 12:37, Carl Eugen Hoyos ha scritto:

Zanelli Franco [hidden email] writes:

> I experienced it when I was trying to include static ffmpeg
> libraries (libavcodec.a, libavformat.a ...) in my shared lib
> (mylib.so) on a 64 bit linux platform, but I don't know how to
> solve, can you help me please?

Could you explain (FFmpeg version, configure line, etc.)
how to reproduce your problem? That may allow us to help.

Carl Eugen

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[Alex Cohn]

On Oct 28, 2013 3:21 PM, "Zanelli Franco" <[hidden email]> wrote:
>
> Ok,
> I'd like to make a shared library called mylib.so that include static ffmpeg libraries libavcodec.a libavformat.a ..etc. in order to have just one shared library
> I'm working on a linux machine 64 bit (ubuntu 12.04).
> I've built ffmpeg libraries from ffmpeg 2.0.1 sources with this configuration:
> --prefix="$HOME/ffmpeg_build"   --extra-cflags="-m64 -I$HOME/ffmpeg_build/include" --extra-ldflags="-L$HOME/ffmpeg_build/lib"   --bindir="$HOME/bin" --extra-libs="-ldl" --enable-gpl --enable-libmp3lame --enable-libx264 --enable-pic

Have you tried
… --extra-cflags="-fPIC -m64 -I$HOME/ffmpeg_build/include"

> When I link the avlibs in mine, with this command:
> gcc -m64    -o mylib.so  -L../ffmpeg_build/lib /home/uts/ffmpeg_build/lib/libavcodec.a -Wl,-R. -shared -s -fPIC
>
> I always get this error:
> /usr/bin/ld: /home/uts/ffmpeg_build/lib/libavcodec.a(deinterlace.o): relocation R_X86_64_PC32 against symbol `ff_pw_4' can not be used when making a shared object; recompile with -fPIC
> /usr/bin/ld: final link failed: Bad value
>
> The same procedure on a x86 linux platform succeded.
> This is the same problem experienced from Dayana in this mailing list the 1st may 2013, I read the answers but they were not helpful
> Can you help me please?
>
> thank you

Alex Cohn

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[fzanelli]

Il 28/10/2013 16:58, Alex Cohn ha scritto:

On Oct 28, 2013 3:21 PM, "Zanelli Franco" <[hidden email]> wrote:
>
> Ok,
> I'd like to make a shared library called mylib.so that include static ffmpeg libraries libavcodec.a libavformat.a ..etc. in order to have just one shared library
> I'm working on a linux machine 64 bit (ubuntu 12.04).
> I've built ffmpeg libraries from ffmpeg 2.0.1 sources with this configuration:
> --prefix="$HOME/ffmpeg_build"   --extra-cflags="-m64 -I$HOME/ffmpeg_build/include" --extra-ldflags="-L$HOME/ffmpeg_build/lib"   --bindir="$HOME/bin" --extra-libs="-ldl" --enable-gpl --enable-libmp3lame --enable-libx264 --enable-pic

Have you tried
… --extra-cflags="-fPIC -m64 -I$HOME/ffmpeg_build/include"

Yes I did. I got the same response that using --enable-pic.
I tried also to use -mcmodel=large, but in that case ffmpeg compilation didn't success

> When I link the avlibs in mine, with this command:
> gcc -m64    -o mylib.so  -L../ffmpeg_build/lib /home/uts/ffmpeg_build/lib/libavcodec.a -Wl,-R. -shared -s -fPIC
>
> I always get this error:
> /usr/bin/ld: /home/uts/ffmpeg_build/lib/libavcodec.a(deinterlace.o): relocation R_X86_64_PC32 against symbol `ff_pw_4' can not be used when making a shared object; recompile with -fPIC
> /usr/bin/ld: final link failed: Bad value
>
> The same procedure on a x86 linux platform succeded.
> This is the same problem experienced from Dayana in this mailing list the 1st may 2013, I read the answers but they were not helpful
> Can you help me please?
>
> thank you

Alex Cohn

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[fzanelli]

Hello again,
Did someone experienced the same problem and can help me to understand what is wrong please?
Thank you

Franco

Il 28/10/2013 14:20, Zanelli Franco ha scritto:

Ok,
I'd like to make a shared library called mylib.so that include static ffmpeg libraries libavcodec.a libavformat.a ..etc. in order to have just one shared library
I'm working on a linux machine 64 bit (ubuntu 12.04).
I've built ffmpeg libraries from ffmpeg 2.0.1 sources with this configuration:
--prefix="$HOME/ffmpeg_build"   --extra-cflags="-m64 -I$HOME/ffmpeg_build/include" --extra-ldflags="-L$HOME/ffmpeg_build/lib"   --bindir="$HOME/bin" --extra-libs="-ldl" --enable-gpl --enable-libmp3lame --enable-libx264 --enable-pic

When I link the avlibs in mine, with this command:
gcc -m64    -o mylib.so  -L../ffmpeg_build/lib /home/uts/ffmpeg_build/lib/libavcodec.a -Wl,-R. -shared -s -fPIC

I always get this error:
/usr/bin/ld: /home/uts/ffmpeg_build/lib/libavcodec.a(deinterlace.o): relocation R_X86_64_PC32 against symbol `ff_pw_4' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: final link failed: Bad value

The same procedure on a x86 linux platform succeded.
This is the same problem experienced from Dayana in this mailing list the 1st may 2013, I read the answers but they were not helpful
Can you help me please?

thank you



Il 28/10/2013 12:37, Carl Eugen Hoyos ha scritto:

Zanelli Franco [hidden email] writes:

> I experienced it when I was trying to include static ffmpeg
> libraries (libavcodec.a, libavformat.a ...) in my shared lib
> (mylib.so) on a 64 bit linux platform, but I don't know how to
> solve, can you help me please?

Could you explain (FFmpeg version, configure line, etc.)
how to reproduce your problem? That may allow us to help.

Carl Eugen

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