static linking of gfortran libraries

static linking of gfortran libraries

[Kay Diederichs]

Dear all,

on CentOS 6 one could use -static-libgcc -static-libgfortran to obtain a
binary which would run on other computers which don't have gfortran
installed.

On CentOS 7 one can install the libgfortran-static and
libquadmath-static RPMs but the resulting binary _still_ requires
/lib64/libquadmath.so as revealed by ldd. gfortran does not recognize an
option like -static-libquadmath . libquadmath is required even for tiny
programs which do not use high precision data types.

Heavy use of Google did not bring any result. I tried with linker
options -Wl,-Bstatic and so on, but without changes.
So, can anyone tell me how to compile/link with gfortran a binary which
does not have a requirement for libquadmath?
If this is not possible, why are there libgfortran-static and
libquadmath-static RPMs ?

thank you,

Kay

Re: static linking of gfortran libraries

[Janne Blomqvist]

On Mon, Jan 18, 2016 at 10:23 AM, Kay Diederichs
<kay.diederichs@uni-konstanz.de> wrote:
> Dear all,
>
> on CentOS 6 one could use -static-libgcc -static-libgfortran to obtain a
> binary which would run on other computers which don't have gfortran
> installed.
>
> On CentOS 7 one can install the libgfortran-static and
> libquadmath-static RPMs but the resulting binary _still_ requires
> /lib64/libquadmath.so as revealed by ldd. gfortran does not recognize an
> option like -static-libquadmath . libquadmath is required even for tiny
> programs which do not use high precision data types.
>
> Heavy use of Google did not bring any result. I tried with linker
> options -Wl,-Bstatic and so on, but without changes.
> So, can anyone tell me how to compile/link with gfortran a binary which
> does not have a requirement for libquadmath?

You might want to backport the patch for PR 50201,
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50201, or file a bug
report to RedHat and hope that they will do it.

> If this is not possible, why are there libgfortran-static and
> libquadmath-static RPMs ?

That's something you have to ask RedHat. I guess they haven't tested
it and the bug has gone unnoticed.

-- 
Janne Blomqvist

Re: static linking of gfortran libraries

[Kay Diederichs]

On 2016-01-18 09:23, Kay Diederichs wrote:
> Dear all,
> 
> on CentOS 6 one could use -static-libgcc -static-libgfortran to obtain a
> binary which would run on other computers which don't have gfortran
> installed.
> 
> On CentOS 7 one can install the libgfortran-static and
> libquadmath-static RPMs but the resulting binary _still_ requires
> /lib64/libquadmath.so as revealed by ldd. gfortran does not recognize an
> option like -static-libquadmath . libquadmath is required even for tiny
> programs which do not use high precision data types.
> 
> Heavy use of Google did not bring any result. I tried with linker
> options -Wl,-Bstatic and so on, but without changes.
> So, can anyone tell me how to compile/link with gfortran a binary which
> does not have a requirement for libquadmath?
> If this is not possible, why are there libgfortran-static and
> libquadmath-static RPMs ?
> 
> thank you,
> 
> Kay
> 
> 

I found the following workaround: edit the file
/usr/lib/gcc/x86_64-redhat-linux/4.8.5/libgfortran.spec and replace

*lib: %{static-libgfortran:--as-needed} -lquadmath
%{static-libgfortran:--no-as-
needed} -lm %(libgcc) %(liborig)

with

*lib: %{static-libgfortran:--as-needed} %{static-libgfortran:--no-as-
needed} -lm %(libgcc) %(liborig)

After doing this, I can now
gfortran -static-libgfortran -static-libgcc myfile.f90
/usr/lib/gcc/x86_64-redhat-linux/4.8.2/libquadmath.a

and it will happily compile a binary without the libquadmath shared
libraries.

Hope this helps somebody else,

Kay