RFC patch: Add libquadmath - and use it in gfortran (round THREE)

[Tobias Burnus <burnus at net-b dot de>]

Hi all,

this patch is an updated version of the one posted at 
http://gcc.gnu.org/ml/gcc-patches/2010-11/msg00790.html

As libquadmath remained unchanged, I did not include the 180K file but I 
just refer to 
http://gcc.gnu.org/ml/gcc-patches/2010-11/msg00790/libquadmath.tar.bz2

TODO: Fix using gfortran in libgomp. Currently, no .mod files are 
generated. It works if one manually runs "make omp_lib.mod" but it won't 
happen automatically.

General remark: Finding the libgfortran.spec makes huge troubles; I 
wonder whether using a spec file is really needed.

Changes:
- Fixed the complete nonsense in transfer.c (thanks Jack, Jerry et al.)
- Moved 128 functions into a separate translation unit (thanks Jakub)  
and added a comment
- Fixed -Wl,--as-needed detection (thanks to Rainer and Ralf)
- Fixed linkage of libquad during build (should help for Darwin, thanks 
to Ralf and Jack)
- Fixed testsuite (thanks to Jerry)

The weakref seems to work, though I still get a dependence on libquad 
with -static-libgfortran. The a.out then only contains a weakref ("w") 
while with a REAL(16) WRITE it contains a hardref ("U"). I thus assume 
it works.


The following description still applies:

On 11/08/2010 09:33 PM, Tobias Burnus wrote:
> The patch contains:
>
> a) libquadmath(.tar.bz2): __float128 math library. It exports all math 
> functions with the suffix "q" ("tanq", "jnq" etc.); it also exports 
> two I/O related functions with the prefix quadmath_. The library is 
> used from libgfortran but can also be used from C/C++. However, there 
> is no printf hook thus doing I/O from C/C++ is a bit more effort. The 
> library is automatically build if language=fortran is enabled, but on 
> systems without __float128 it is a no op.
>
> b) quad.diff: The changes to the toplevel Makefile.def/configure.ac to 
> build libquad with language=fortran; changes to gcc/fortran to use 
> __float128; changes to libgfortran to use libquadmath.
> Libgfortran automatically links libquadmath if it is available; if 
> -static-libgfortran is used, the (dynamically linked) libquadmath is 
> surounded by --as-needed/--no-as-needed.
>
> c) quad_gen.diff: Due to popular request, the generated files.

Tobias

Current diffstat:

$ diffstat quad.diff
 b/Makefile.def                             |    3
 b/configure.ac                             |    1
 b/gcc/fortran/gfortranspec.c               |   38 ++++++++++
 b/gcc/fortran/trans-io.c                   |   49 ++++++++++++-
 b/gcc/fortran/trans-types.c                |    8 +-
 b/gcc/testsuite/lib/gcc-defs.exp           |    3
 b/gcc/testsuite/lib/gfortran.exp           |   14 +++
 b/libgfortran/Makefile.am                  |    7 +
 b/libgfortran/acinclude.m4                 |   62 ++++++++++++++++
 b/libgfortran/configure.ac                 |   13 ++-
 b/libgfortran/gfortran.map                 |    5 +
 b/libgfortran/intrinsics/cshift0.c         |   28 +++++--
 b/libgfortran/intrinsics/erfc_scaled_inc.c |   11 ++
 b/libgfortran/intrinsics/pack_generic.c    |   28 +++++--
 b/libgfortran/intrinsics/spread_generic.c  |   56 +++++++++++----
 b/libgfortran/intrinsics/unpack_generic.c  |   56 +++++++++++----
 b/libgfortran/io/read.c                    |    8 +-
 b/libgfortran/io/transfer.c                |   20 ++++-
 b/libgfortran/io/write.c                   |    1
 b/libgfortran/io/write_float.def           |   11 ++
 b/libgfortran/libgfortran.h                |   18 ++++
 b/libgfortran/m4/mtype.m4                  |    2
 b/libgfortran/runtime/in_pack_generic.c    |   29 ++++++-
 b/libgfortran/runtime/in_unpack_generic.c  |   31 ++++++--
 b/libgomp/configure.ac                     |    6 +
 gcc/libgfortran/io/transfer128.c           |  108 
+++++++++++++++++++++++++++++
 gcc/libgfortran/kinds-override.h           |   46 ++++++++++++
 gcc/libgfortran/libgfortran.spec.in        |    8 ++
 28 files changed, 599 insertions(+), 71 deletions(-)

$ diffstat quad-gen.diff
 b/Makefile.in                          |  467 +
 b/configure                            |    1
 b/libgfortran/Makefile.in              |   86
 b/libgfortran/config.h.in              |    3
 b/libgfortran/configure                |  119
 b/libgomp/configure                    |    6
 gcc/libgfortran/generated/pow_r16_i4.c |   75
 gcc/libquadmath/Makefile.in            | 1219 +++
 gcc/libquadmath/aclocal.m4             |  979 ++
 gcc/libquadmath/config.h.in            |   68
 gcc/libquadmath/configure              |13288 
+++++++++++++++++++++++++++++++++
 11 files changed, 16284 insertions(+), 27 deletions(-)

Attachment: quad.diff.bz2
Description: application/bzip

Attachment: quad-gen.diff.bz2
Description: application/bzip