procyberian/gcc
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

libstdc++: Add separate autoconf macro for std::float_t and std::double_t [PR109818]

Browse source 
This should make it possible to use openlibm with djgpp (and other
targets with missing C99 <math.h> functions). The <math.h> from openlibm
provides all the functions, but not the float_t and double_t typedefs.
By separating the autoconf checks for the functionsand the typedefs, we
don't disable support for all the functions just because those typedefs
are not present.

libstdc++-v3/ChangeLog:

	PR libstdc++/109818
	* acinclude.m4 (GLIBCXX_ENABLE_C99): Add separate check for
	float_t and double_t and define HAVE_C99_FLT_EVAL_TYPES.
	* config.h.in: Regenerate.
	* configure: Regenerate.
	* include/c_global/cmath (float_t, double_t): Guard using new
	_GLIBCXX_HAVE_C99_FLT_EVAL_TYPES macro.
This commit is contained in:
Jonathan Wakely 2023-05-31 12:22:06 +01:00
parent 1f378f6dd3
commit 49f59826c6
4 changed files with 62 additions and 6 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

21
libstdc++-v3/acinclude.m4
View file

@ -1273,13 +1273,28 @@ AC_DEFUN([GLIBCXX_ENABLE_C99], [
in <cmath> in namespace std for C++11.])
fi
# Check for the existence of <math.h> functions.
AC_CACHE_CHECK([for ISO C99 function support for C++11 in <math.h>],
glibcxx_cv_c99_math_funcs, [
# Check for the existence of <math.h> typedefs.
AC_CACHE_CHECK([for ISO C99 float types for C++11 in <math.h>],
glibcxx_cv_c99_flt_eval_types, [
AC_TRY_COMPILE([#include <math.h>],
[// Types
typedef double_t my_double_t;
typedef float_t my_float_t;
],
[glibcxx_cv_c99_flt_eval_types=yes],
[glibcxx_cv_c99_flt_eval_types=no])
])
if test x"$glibcxx_cv_c99_flt_eval_types" = x"yes"; then
AC_DEFINE(HAVE_C99_FLT_EVAL_TYPES, 1,
[Define if C99 float_t and double_t in <math.h> should be
imported in <cmath> in namespace std for C++11.])
fi
# Check for the existence of <math.h> functions.
AC_CACHE_CHECK([for ISO C99 function support for C++11 in <math.h>],
glibcxx_cv_c99_math_funcs, [
AC_TRY_COMPILE([#include <math.h>],
[
// Hyperbolic
acosh(0.0);
acoshf(0.0f);

4
libstdc++-v3/config.h.in
View file

@ -42,6 +42,10 @@
/* Define to 1 if you have the `at_quick_exit' function. */
#undef HAVE_AT_QUICK_EXIT
/* Define if C99 float_t and double_t in <math.h> should be imported in
<cmath> in namespace std for C++11. */
#undef HAVE_C99_FLT_EVAL_TYPES
/* Define to 1 if the target assembler supports thread-local storage. */
#undef HAVE_CC_TLS

41
libstdc++-v3/configure vendored
View file

@ -18275,6 +18275,43 @@ $as_echo "#define _GLIBCXX11_USE_C99_MATH 1" >>confdefs.h
fi
# Check for the existence of <math.h> typedefs.
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for ISO C99 float types for C++11 in <math.h>" >&5
$as_echo_n "checking for ISO C99 float types for C++11 in <math.h>... " >&6; }
if ${glibcxx_cv_c99_flt_eval_types+:} false; then :
$as_echo_n "(cached) " >&6
else
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
#include <math.h>
int
main ()
{
// Types
typedef double_t my_double_t;
typedef float_t my_float_t;
;
return 0;
}
_ACEOF
if ac_fn_cxx_try_compile "$LINENO"; then :
glibcxx_cv_c99_flt_eval_types=yes
else
glibcxx_cv_c99_flt_eval_types=no
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $glibcxx_cv_c99_flt_eval_types" >&5
$as_echo "$glibcxx_cv_c99_flt_eval_types" >&6; }
if test x"$glibcxx_cv_c99_flt_eval_types" = x"yes"; then
$as_echo "#define HAVE_C99_FLT_EVAL_TYPES 1" >>confdefs.h
fi
# Check for the existence of <math.h> functions.
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for ISO C99 function support for C++11 in <math.h>" >&5
$as_echo_n "checking for ISO C99 function support for C++11 in <math.h>... " >&6; }
@ -18288,9 +18325,7 @@ else
int
main ()
{
// Types
typedef double_t my_double_t;
typedef float_t my_float_t;
// Hyperbolic
acosh(0.0);
acoshf(0.0f);

2
libstdc++-v3/include/c_global/cmath
View file

@ -1877,9 +1877,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
#undef truncf
#undef truncl
#ifdef _GLIBCXX_HAVE_C99_FLT_EVAL_TYPES
// types
using ::double_t;
using ::float_t;
#endif
// functions
using ::acosh;