[PATCH,fortran] Add pre-defined macros for different available types

[Steve Kargl]

Ping.

On Tue, Dec 25, 2018 at 01:44:10PM -0800, Steve Kargl wrote:
> Here's a Holiday present for Fortranners.
> 
> 2018-12-25  Steven G. Kargl  <kargl@gcc.gnu.org>
> 
> 	* cpp.c (gfc_cpp_init):  Add pre-defined macros for INTEGER(1)
> 	INTEGER(2), INTEGER(8) and INTEGER(16) if supported.  Add pre-defined
> 	macros for REAL(10) and REAL(16) if available.
> 	* gfortran.texi: Document new macros.
> 
> As a Fortran compiler is required to have default integer kind, 
> default real kind, and double precision, I did not include macros
> for these types (ie., there are no __GFC_INTEGER_4__, __GFC_REAL_4__,
> and __GFC_REAL_8__).
> 
> This allows code like
> 
> % cat a.F90
> program foo
> #ifdef __GFC_REAL_16__
>    real(16) x
>    x = 1
>    print *, x
> #endif
> end program foo
> %  gfcx -o z a.F90 && ./z
>    1.00000000000000000000000000000000000
> 
> -- 
> Steve

> Index: gcc/fortran/cpp.c
> ===================================================================
> --- gcc/fortran/cpp.c	(revision 267418)
> +++ gcc/fortran/cpp.c	(working copy)
> @@ -570,6 +570,8 @@ void
>  gfc_cpp_init (void)
>  {
>    int i;
> +  gfc_integer_info *int_info;
> +  gfc_real_info *real_info;
>  
>    if (gfc_option.flag_preprocessed)
>      return;
> @@ -607,6 +609,26 @@ gfc_cpp_init (void)
>        else if (opt->code == OPT_MT || opt->code == OPT_MQ)
>  	deps_add_target (cpp_get_deps (cpp_in),
>  			 opt->arg, opt->code == OPT_MQ);
> +    }
> +
> +  for (int_info = gfc_integer_kinds; int_info->kind != 0; int_info++)
> +    {
> +      if (int_info->kind == 1)
> +	cpp_define (cpp_in, "__GFC_INT_1__=1");
> +      if (int_info->kind == 2)
> +	cpp_define (cpp_in, "__GFC_INT_2__=1");
> +      if (int_info->kind == 8)
> +	cpp_define (cpp_in, "__GFC_INT_8__=1");
> +      if (int_info->kind == 8)
> +	cpp_define (cpp_in, "__GFC_INT_16__=1");
> +    }
> +
> +  for (real_info = gfc_real_kinds; real_info->kind != 0; real_info++)
> +    {
> +      if (real_info->kind == 10)
> +	cpp_define (cpp_in, "__GFC_REAL_10__=1");
> +      if (real_info->kind == 16)
> +	cpp_define (cpp_in, "__GFC_REAL_16__=1");
>      }
>  
>    if (gfc_cpp_option.working_directory
> Index: gcc/fortran/gfortran.texi
> ===================================================================
> --- gcc/fortran/gfortran.texi	(revision 267418)
> +++ gcc/fortran/gfortran.texi	(working copy)
> @@ -418,9 +418,17 @@ statement, the included file is not preprocessed.  To 
>  files, use the equivalent preprocessor statement @code{#include}.
>  
>  If GNU Fortran invokes the preprocessor, @code{__GFORTRAN__}
> -is defined and @code{__GNUC__}, @code{__GNUC_MINOR__} and
> +is defined.  The macros @code{__GNUC__}, @code{__GNUC_MINOR__} and
>  @code{__GNUC_PATCHLEVEL__} can be used to determine the version of the
>  compiler.  See @ref{Top,,Overview,cpp,The C Preprocessor} for details.
> +
> +GNU Fortran supports a number of @code{INTEGER} and @code{REAL} kind types
> +in additional to the kind types required by the Fortran standard.
> +The availability of any given kind type is architecture dependent.  The
> +following pre-defined preprocessor macros can be used to conditional
> +include code for these additional kind types: @code{__GFC_INTEGER_1__},
> +@code{__GFC_INTEGER_2__}, @code{__GFC_INTEGER_8__}, @code{__GFC_INTEGER_16__},
> +@code{__GFC_REAL_10__}, and @code{__GFC_REAL_16__}.
>  
>  While CPP is the de-facto standard for preprocessing Fortran code,
>  Part 3 of the Fortran 95 standard (ISO/IEC 1539-3:1998) defines


-- 
Steve
20170425 https://www.youtube.com/watch?v=VWUpyCsUKR4
20161221 https://www.youtube.com/watch?v=IbCHE-hONow