Re: statically compile in libquadmath

[Kay Diederichs <kay.diederichs@uni-konstanz.de>]

On 2017-07-27 15:24, Manfred Schwarb wrote:
> Hi,
> 
> there is the long standing annoyance that it is very hard to
> statically compile in libquadmath.
> See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=46539 and
> https://gcc.gnu.org/ml/gcc-patches/2014-10/msg00375.html.
> 
> Unfortunately, the patch from FX went nowhere, and the
> second suggestion of Tobias (gfortran -specs=myspecfile) does not work.
> 
> There remain two working options:
> 1) compile with gcc:
>    # gcc -static-libgcc -Wl,-Bstatic -lgfortran -lquadmath -Wl,-Bdynamic -lm
> 2) modify <prefix>/lib*/libgfortran.spec of the compiler itself
> 
> It crossed my mind that one could do the second option in a conditional way:
> 
> --- libgfortran.spec.old     2017-05-29 15:55:24.939239222 +0000
> +++ libgfortran.spec    2017-07-27 12:55:05.006518676 +0000
> @@ -5,4 +5,4 @@
>  #
> 
>  %rename lib liborig
> -*lib: %{static-libgfortran:--as-needed} -lquadmath %{static-libgfortran:--no-as-needed} -lm %(libgcc) %(liborig)
> +*lib: %{static-libgfortran:--as-needed} %{static-libgfortran:-Bstatic} -lquadmath %{static-libgfortran:-Bdynamic} %{static-libgfortran:--no-as-needed} -lm %(libgcc) %(liborig)
> 
> 
> This would couple -static-libgfortran to also compile in libquadmath.
> While such a hack is not pretty, it would probably match what most users want,
> namely to be able to run gfortran programs on other boxes without installed gfortran compiler
> (and therefore most probably also without libquadmath),
> or to enable additional compile optimizations to gain optimal performance.
> 
> Thoughts?
> 
> Cheers,
> Manfred
> 
> 
> PS1: I don't have any gcc paperwork assignments
> PS2: I'm off for holidays the next few days, so response will be delayed
> 

I would very much welcome this. It has been a nightmare to statically
link with gfortran for distribution of binaries to machines which not
necessarily have gfortran libraries.

Kay