This patch is for:
PR100907 - Bind(c): failure handling wide character
PR100911 - Bind(c): failure handling C_PTR
PR100914 - Bind(c): errors handling complex
PR100915 - Bind(c): failure handling C_FUNPTR
PR100917 - Bind(c): errors handling long double real
All of these problems are related to the GFC descriptors constructed
by the Fortran front end containing ambigous or incomplete
information. This patch does not attempt to change the GFC data
structure or the front end, and only makes the runtime interpret it in
more reasonable ways. It's not a complete fix for any of the listed
issues.
The Fortran front end does not distinguish between C_PTR and
C_FUNPTR, mapping both onto BT_VOID. That is what this patch does also.
The other bugs are related to GFC descriptors only containing elem_len
and not kind. For complex types, the elem_len needs to be divided by
2 and then mapped onto a real kind. On x86 targets, the kind
corresponding to C long double is different than its elem_len; since
we cannot accurately disambiguate between a 16-byte kind 10 long
double from __float128, this patch arbitrarily prefers to interpret that as
the standard long double type rather than the GNU extension.
Similarly, for character types, the GFC descriptor cannot distinguish
between character(kind=c_char, len=4) and character(kind=ucs4, len=1).
But since the front end currently rejects anything other than len=1
(PR92482) this patch uses the latter interpretation.
2021-09-01 Sandra Loosemore <sandra@codesourcery.com>
José Rui Faustino de Sousa <jrfsousa@gmail.com>
gcc/testsuite/
PR fortran/100911
PR fortran/100915
PR fortran/100916
* gfortran.dg/PR100911.c: New file.
* gfortran.dg/PR100911.f90: New file.
* gfortran.dg/PR100914.c: New file.
* gfortran.dg/PR100914.f90: New file.
* gfortran.dg/PR100915.c: New file.
* gfortran.dg/PR100915.f90: New file.
libgfortran/
PR fortran/100907
PR fortran/100911
PR fortran/100914
PR fortran/100915
PR fortran/100917
* ISO_Fortran_binding-1-tmpl.h (CFI_type_cfunptr): Make equivalent
to CFI_type_cptr.
* runtime/ISO_Fortran_binding.c (cfi_desc_to_gfc_desc): Fix
handling of CFI_type_cptr and CFI_type_cfunptr. Additional error
checking and code cleanup.
(gfc_desc_to_cfi_desc): Likewise. Also correct kind mapping
for character, complex, and long double types.
93b6b2f614