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Update to AX_FC_REAL8 macro #856

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Merged
merged 2 commits into from
Apr 16, 2025
Merged

Update to AX_FC_REAL8 macro #856

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870a2d2
Update to AX_FC_REAL8 macro
marshallward Mar 14, 2025
e83cb73
Merge branch 'dev/gfdl' into ac_real8_update
adcroft Apr 15, 2025
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81 changes: 40 additions & 41 deletions ac/deps/m4/ax_fc_real8.m4
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Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -15,12 +15,14 @@ dnl avoiding any flags with affect integers, but this should still be used with
dnl some care.
dnl
dnl GCC -fdefault-real-8, -fdefault-double-8
dnl AMD (flang) -fdefault-real-8
dnl [Common alias] -r8
dnl Intel Fortran -real-kind 64
dnl PGI Fortran -Mr8
dnl Cray Fortran -s real64
dnl Intel -real-kind 64
dnl PGI/Nvidia -Mr8
dnl Cray -s real64
dnl NAG -double
dnl
dnl
dnl NOTE:
dnl - Many compilers accept -r8 for real and double precision sizes, but
dnl several compiler-specific options are also provided.
Expand All @@ -34,53 +36,50 @@ dnl
dnl Neither flag describes what we actually want, but we include it here
dnl as a last resort.
dnl
AC_DEFUN([AX_FC_REAL8],
[
AC_DEFUN([AX_FC_REAL8], [
REAL8_FCFLAGS=
AC_ARG_ENABLE([real8],
[AS_HELP_STRING([--disable-real-8], [do not force 8-byte reals])])
AC_ARG_ENABLE([real8], [
AS_HELP_STRING([--disable-real-8], [do not force 8-byte reals])
])
if test "$enable_real8" != no; then
AC_CACHE_CHECK([for $FC option to force 8-byte reals],
[ac_cv_prog_fc_real8],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([], [
real :: x(4)
double precision :: y(4)
integer, parameter :: &
m = merge(1, 0, kind(x(1)) == selected_real_kind(15, 307)), &
n = merge(1, 0, kind(y(1)) == selected_real_kind(15, 307))
print *, x(::m)
print *, y(::n)
])],
[ac_cv_prog_fc_real8='none needed'],
[ac_cv_prog_fc_real8='unsupported'
for ac_option in "-fdefault-real-8 -fdefault-double-8" -r8 "-real-kind 64" -Mr8 "-s real64" -double; do
ac_save_FCFLAGS=$FCFLAGS
FCFLAGS="$FCFLAGS $ac_option"
AC_LINK_IFELSE(
[AC_LANG_PROGRAM([], [
[ac_cv_prog_fc_real8], [
ac_cv_prog_fc_real8='unsupported'
ac_fc_real8_FCFLAGS_save=$FCFLAGS
for ac_flag in none \
-fdefault-real-8 \
"-fdefault-real-8 -fdefault-double-8" \
-r8 \
"-real-kind 64" \
-Mr8 \
"-s real64" \
-double
do
test "$ac_flag" != none && FCFLAGS="$ac_fc_real8_FCFLAGS_save $ac_flag"
AC_LINK_IFELSE([
AC_LANG_PROGRAM([], [
real :: x(4)
double precision :: y(4)
integer, parameter :: &
m = merge(1, 0, kind(x(1)) == selected_real_kind(15, 307)), &
n = merge(1, 0, kind(y(1)) == selected_real_kind(15, 307))
print *, x(::m)
print *, y(::n)
])],
[ac_cv_prog_fc_real8=$ac_option]
)
FCFLAGS=$ac_save_FCFLAGS
if test "$ac_cv_prog_fc_real8" != unsupported; then
break
fi
done])
])
case $ac_cv_prog_fc_real8 in #(
"none needed" | unsupported)
;; #(
*)
REAL8_FCFLAGS=$ac_cv_prog_fc_real8 ;;
esac
])
], [ac_cv_prog_fc_real8=$ac_flag ; break])
done
FCFLAGS=$ac_fc_real8_FCFLAGS_save
])
case $ac_cv_prog_fc_real8 in #(
"none")
ac_cv_prog_fc_real8='none needed'
;; #(
unsupported)
;; #(
*)
REAL8_FCFLAGS=$ac_cv_prog_fc_real8
;;
esac
fi
AC_SUBST(REAL8_FCFLAGS)
AC_SUBST([REAL8_FCFLAGS])
])
81 changes: 40 additions & 41 deletions ac/m4/ax_fc_real8.m4
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -15,12 +15,14 @@ dnl avoiding any flags with affect integers, but this should still be used with
dnl some care.
dnl
dnl GCC -fdefault-real-8, -fdefault-double-8
dnl AMD (flang) -fdefault-real-8
dnl [Common alias] -r8
dnl Intel Fortran -real-kind 64
dnl PGI Fortran -Mr8
dnl Cray Fortran -s real64
dnl Intel -real-kind 64
dnl PGI/Nvidia -Mr8
dnl Cray -s real64
dnl NAG -double
dnl
dnl
dnl NOTE:
dnl - Many compilers accept -r8 for real and double precision sizes, but
dnl several compiler-specific options are also provided.
Expand All @@ -34,53 +36,50 @@ dnl
dnl Neither flag describes what we actually want, but we include it here
dnl as a last resort.
dnl
AC_DEFUN([AX_FC_REAL8],
[
AC_DEFUN([AX_FC_REAL8], [
REAL8_FCFLAGS=
AC_ARG_ENABLE([real8],
[AS_HELP_STRING([--disable-real-8], [do not force 8-byte reals])])
AC_ARG_ENABLE([real8], [
AS_HELP_STRING([--disable-real-8], [do not force 8-byte reals])
])
if test "$enable_real8" != no; then
AC_CACHE_CHECK([for $FC option to force 8-byte reals],
[ac_cv_prog_fc_real8],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([], [
real :: x(4)
double precision :: y(4)
integer, parameter :: &
m = merge(1, 0, kind(x(1)) == selected_real_kind(15, 307)), &
n = merge(1, 0, kind(y(1)) == selected_real_kind(15, 307))
print *, x(::m)
print *, y(::n)
])],
[ac_cv_prog_fc_real8='none needed'],
[ac_cv_prog_fc_real8='unsupported'
for ac_option in "-fdefault-real-8 -fdefault-double-8" -r8 "-real-kind 64" -Mr8 "-s real64" -double; do
ac_save_FCFLAGS=$FCFLAGS
FCFLAGS="$FCFLAGS $ac_option"
AC_LINK_IFELSE(
[AC_LANG_PROGRAM([], [
[ac_cv_prog_fc_real8], [
ac_cv_prog_fc_real8='unsupported'
ac_fc_real8_FCFLAGS_save=$FCFLAGS
for ac_flag in none \
-fdefault-real-8 \
"-fdefault-real-8 -fdefault-double-8" \
-r8 \
"-real-kind 64" \
-Mr8 \
"-s real64" \
-double
do
test "$ac_flag" != none && FCFLAGS="$ac_fc_real8_FCFLAGS_save $ac_flag"
AC_LINK_IFELSE([
AC_LANG_PROGRAM([], [
real :: x(4)
double precision :: y(4)
integer, parameter :: &
m = merge(1, 0, kind(x(1)) == selected_real_kind(15, 307)), &
n = merge(1, 0, kind(y(1)) == selected_real_kind(15, 307))
print *, x(::m)
print *, y(::n)
])],
[ac_cv_prog_fc_real8=$ac_option]
)
FCFLAGS=$ac_save_FCFLAGS
if test "$ac_cv_prog_fc_real8" != unsupported; then
break
fi
done])
])
case $ac_cv_prog_fc_real8 in #(
"none needed" | unsupported)
;; #(
*)
REAL8_FCFLAGS=$ac_cv_prog_fc_real8 ;;
esac
])
], [ac_cv_prog_fc_real8=$ac_flag ; break])
done
FCFLAGS=$ac_fc_real8_FCFLAGS_save
])
case $ac_cv_prog_fc_real8 in #(
"none")
ac_cv_prog_fc_real8='none needed'
;; #(
unsupported)
;; #(
*)
REAL8_FCFLAGS=$ac_cv_prog_fc_real8
;;
esac
fi
AC_SUBST(REAL8_FCFLAGS)
AC_SUBST([REAL8_FCFLAGS])
])
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