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libgfortran: Fix up LIBGFOR_CHECK_FLOAT128 [PR106137]

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My recent gfortran + libgfortran patch apparently broke (some?) aarch64
builds.  While it is desirable to use just _Float128 rather than __float128,
we only want to use it (and e.g. define HAVE_FLOAT128) on targets where
_Float128 is supported and long double isn't IEEE quad precision.
Which is targets that support __float128 type which we have been testing
for before - _Float128 is supported on those targets and on targets where
long double is IEEE quad precision.

So, the following patch restores check for whether __float128 is supported
into the LIBGFOR_CHECK_FLOAT128 check which determines whether
HAVE_FLOAT128 is defined or whether to use libquadmath, so that e.g. on
aarch64 where long double is IEEE quad we don't do that.

2022-06-29  Jakub Jelinek  <jakub@redhat.com>

	PR bootstrap/106137
	* acinclude.m4 (LIBGFOR_CHECK_FLOAT128): Adjust comment.
	Also test for __float128.
	(HAVE_FLOAT128): Adjust description.
	* config.h.in: Regenerated.
	* configure: Regenerated.
This commit is contained in:
Jakub Jelinek 2022-06-29 17:04:50 +02:00
parent aa87b7541b
commit c022c0de2a
3 changed files with 24 additions and 6 deletions
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12
libgfortran/acinclude.m4
View File

@ -261,7 +261,7 @@ __mingw_snprintf (NULL, 0, "%d\n", 1);
fi
])
dnl Check whether we have a __float128 type
dnl Check whether we have a __float128 and _Float128 type
AC_DEFUN([LIBGFOR_CHECK_FLOAT128], [
LIBQUADSPEC=
LIBQUADLIB=
@ -276,7 +276,6 @@ AC_DEFUN([LIBGFOR_CHECK_FLOAT128], [
GCC_TRY_COMPILE_OR_LINK([
_Float128 foo (_Float128 x)
{
_Complex _Float128 z1, z2;
z1 = x;
@ -290,11 +289,18 @@ AC_DEFUN([LIBGFOR_CHECK_FLOAT128], [
{
return x * __builtin_huge_valf128 ();
}
__float128 baz (__float128 x)
{
return x * __builtin_huge_valf128 ();
}
],[
foo (1.2F128);
bar (1.2F128);
baz (1.2F128);
foo (1.2Q);
bar (1.2Q);
baz (1.2Q);
],[
libgfor_cv_have_float128=yes
],[
@ -310,7 +316,7 @@ AC_DEFUN([LIBGFOR_CHECK_FLOAT128], [
if test "x$USE_IEC_60559" = xyes; then
AC_DEFINE(USE_IEC_60559, 1, [Define if IEC 60559 *f128 APIs should be used for _Float128.])
fi
AC_DEFINE(HAVE_FLOAT128, 1, [Define if have a usable _Float128 type.])
AC_DEFINE(HAVE_FLOAT128, 1, [Define if target has usable _Float128 and __float128 types.])
dnl Check whether -Wl,--as-needed resp. -Wl,-zignore is supported
dnl

2
libgfortran/config.h.in
View File

@ -468,7 +468,7 @@
/* Define to 1 if you have the <fenv.h> header file. */
#undef HAVE_FENV_H
/* Define if have a usable _Float128 type. */
/* Define if target has usable _Float128 and __float128 types. */
#undef HAVE_FLOAT128
/* Define to 1 if you have the <floatingpoint.h> header file. */

16
libgfortran/configure vendored
View File

@ -30130,7 +30130,6 @@ else
_Float128 foo (_Float128 x)
{
_Complex _Float128 z1, z2;
z1 = x;
@ -30145,14 +30144,21 @@ else
return x * __builtin_huge_valf128 ();
}
__float128 baz (__float128 x)
{
return x * __builtin_huge_valf128 ();
}
int
main ()
{
foo (1.2F128);
bar (1.2F128);
baz (1.2F128);
foo (1.2Q);
bar (1.2Q);
baz (1.2Q);
;
return 0;
@ -30177,7 +30183,6 @@ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
_Float128 foo (_Float128 x)
{
_Complex _Float128 z1, z2;
z1 = x;
@ -30192,14 +30197,21 @@ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
return x * __builtin_huge_valf128 ();
}
__float128 baz (__float128 x)
{
return x * __builtin_huge_valf128 ();
}
int
main ()
{
foo (1.2F128);
bar (1.2F128);
baz (1.2F128);
foo (1.2Q);
bar (1.2Q);
baz (1.2Q);
;
return 0;