Here's a Holiday present for Fortranners.
2018-12-25 Steven G. Kargl <ka...@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
