From abfc19a7732d6e72ff738a4c2ff6f205677c9fa2 Mon Sep 17 00:00:00 2001
From: Min RK <benjaminrk@gmail.com>
Date: Wed, 14 Jun 2023 16:20:49 +0200
Subject: [PATCH 1/2] avoid test execution when cross-compiling

---
 configure.ac | 25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index 2c3b041677..830dd176da 100644
--- a/configure.ac
+++ b/configure.ac
@@ -138,6 +138,9 @@ AC_SUBST([CPPFLAGS])
 AC_SUBST([JNIFLAGS])
 AC_SUBST([AR_FLAGS])
 
+AC_SUBST([cross_compiling])
+
+
 ## H5_CFLAGS (and company) are for CFLAGS that should be used on HDF5, but
 ## not exported to h5cc (or h5fc, etc.)
 ##
@@ -575,19 +578,21 @@ if test "X$HDF_FORTRAN" = "Xyes"; then
   FLT128_DIG=0
   LDBL_DIG=0
 
+  AC_SUBST([PAC_C_MAX_REAL_PRECISION])
+
+  if test -z "$PAC_C_MAX_REAL_PRECISION"; then
   AC_CHECK_SIZEOF([__float128])
   AC_CHECK_SIZEOF([_Quad])
   AC_CHECK_HEADERS([quadmath.h], [HAVE_QUADMATH=1], [])
   PAC_FC_LDBL_DIG
 
-  AC_SUBST([PAC_C_MAX_REAL_PRECISION])
-
   if test "$ac_cv_sizeof___float128" != 0 && test "$FLT128_DIG" != 0 ; then
     AC_DEFINE([HAVE_FLOAT128], [1], [Determine if __float128 is available])
     PAC_C_MAX_REAL_PRECISION=$FLT128_DIG
   else
     PAC_C_MAX_REAL_PRECISION=$LDBL_DIG
   fi
+  fi
   AC_DEFINE_UNQUOTED([PAC_C_MAX_REAL_PRECISION], $PAC_C_MAX_REAL_PRECISION, [Determine the maximum decimal precision in C])
   AC_MSG_RESULT([$PAC_C_MAX_REAL_PRECISION])
 
@@ -679,6 +684,15 @@ if test "X$HDF_FORTRAN" = "Xyes"; then
 
   ## See if the fortran compiler supports the intrinsic module "ISO_FORTRAN_ENV"
   PAC_PROG_FC_ISO_FORTRAN_ENV
+
+  if test "$cross_compiling" = yes; then
+  ## defines from aclocal_fc.m4, but require execution
+        AC_DEFINE_UNQUOTED([PAC_FC_MAX_REAL_PRECISION], $PAC_FC_MAX_REAL_PRECISION, [Define Fortran Maximum Real Decimal Precision])
+        AC_DEFINE_UNQUOTED([H5CONFIG_F_NUM_RKIND], $H5CONFIG_F_NUM_RKIND, [Define number of valid Fortran REAL KINDs])
+        AC_DEFINE_UNQUOTED([H5CONFIG_F_NUM_IKIND], $H5CONFIG_F_NUM_IKIND, [Define number of valid Fortran INTEGER KINDs])
+        AC_DEFINE_UNQUOTED([H5CONFIG_F_RKIND], $H5CONFIG_F_RKIND, [Define valid Fortran REAL KINDs])
+        AC_DEFINE_UNQUOTED([H5CONFIG_F_IKIND], $H5CONFIG_F_IKIND, [Define valid Fortran INTEGER KINDs])
+  else
   ## Check KIND and size of native integer
   PAC_FC_NATIVE_INTEGER
 
@@ -687,6 +701,7 @@ if test "X$HDF_FORTRAN" = "Xyes"; then
   ## Find all sizeofs for available KINDs
   PAC_FC_SIZEOF_INT_KINDS
   PAC_FC_SIZEOF_REAL_KINDS
+  fi
 
   AC_SUBST([PAC_FC_ALL_REAL_KINDS])
   AC_SUBST([PAC_FC_MAX_REAL_PRECISION])
@@ -782,9 +797,15 @@ if test "X$HDF_FORTRAN" = "Xyes"; then
   AC_MSG_RESULT([$PAC_FC_ALL_REAL_KINDS])
 
   dnl count the number of real kinds
+  if test -z "$H5CONFIG_F_NUM_RKIND"; then
   H5CONFIG_F_NUM_RKIND="INTEGER, PARAMETER :: num_rkinds = `echo \"[$]PAC_FC_ALL_REAL_KINDS\" |  tr -d -c ',\n' | awk '{ print length + 1; }'`"
+  fi
+  if test -z "$H5CONFIG_F_RKIND"; then
   H5CONFIG_F_RKIND="INTEGER, DIMENSION(1:num_rkinds) :: rkind = (/`echo $PAC_FC_ALL_REAL_KINDS | sed -e 's/{//g' | sed -e 's/}//g' | sed -e 's/ /,/g'`/)"
+  fi
+  if test -z "$H5CONFIG_F_RKIND_SIZEOF"; then
   H5CONFIG_F_RKIND_SIZEOF="INTEGER, DIMENSION(1:num_rkinds) :: rkind_sizeof = (/`echo $PAC_FC_ALL_REAL_KINDS_SIZEOF | sed -e 's/{//g' | sed -e 's/}//g'| sed -e 's/ /,/g'`/)"
+  fi
 
   AC_DEFINE_UNQUOTED([H5CONFIG_F_NUM_RKIND], $H5CONFIG_F_NUM_RKIND, [Define number of valid Fortran REAL KINDs])
   AC_DEFINE_UNQUOTED([H5CONFIG_F_RKIND], $H5CONFIG_F_RKIND, [Define valid Fortran REAL KINDs])
-- 
2.34.1