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Contains ad hoc patches for cross building.

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Thomas Danckaert <thomas.danckaert@gmail.com>
Date: Thu, 3 Mar 2016 17:13:29 +0100
Subject: [PATCH] Remove AC_TRY_RUN to fix cross compiling.


diff --git a/configure.ac b/configure.ac
index 1111111..2222222 100755
--- a/configure.ac
+++ b/configure.ac
@@ -160,17 +160,7 @@ dnl Check if -Df2cFortran is specified
 dnl Running only the preprocessor may not be a good idea
 dnl because this can be hard-coded.
 AC_MSG_CHECKING([for fc2Fortran macro])
-AC_CACHE_VAL([he2_cv_f2cFortran_defined],
-    [AC_TRY_RUN([
-    int main(void)
-    {
-    #ifdef f2cFortran
-      return 0;
-    #else
-      return 1;
-    #endif
-    }
-    ], [he2_cv_f2cFortran_defined=yes], [he2_cv_f2cFortran_defined=no],)])
+AC_CACHE_VAL([he2_cv_f2cFortran_defined],[he2_cv_f2cFortran_defined=yes])
 if test ${he2_cv_f2cFortran_defined} = "yes"; then
   F2CFORTRAN_MACRO="yes"
   AC_MSG_RESULT([defined])
@@ -181,18 +171,7 @@ fi
 
 if test ${he2_cv_f2cFortran_defined} = "yes"; then
 
-  AC_CHECK_SIZEOF([int*])
-  AC_CACHE_VAL([he2_cv_32ptr],
-      [AC_TRY_RUN([
-      int main(void)
-      {
-#ifdef SIZEOF_INTP
-	return SIZEOF_INTP == 4 ? 0 : 1;
-#else
-#error SIZEOF_INTP is not defined
-#endif
-      }
-      ], [he2_cv_32ptr=yes], [he2_cv_32ptr=no],)])
+  AC_CACHE_VAL([he2_cv_32ptr],[he2_cv_32ptr=no])
   if test ${he2_cv_32ptr} = "yes"; then
     AC_MSG_NOTICE([possibly 32 bit system])
     F2CFORTRAN_32PTR="yes"
@@ -346,32 +325,9 @@ if test "X$HAVE_SZLIB" = "Xyes"; then
 
     AC_MSG_CHECKING([for szlib encoder])
 
-    AC_CACHE_VAL([he2_cv_szlib_functional],
-        [AC_TRY_RUN([
-	#include <stddef.h>
-        #include <szlib.h>
-
-        int main(void)
-        {
-            SZ_encoder_enabled();
-            exit(0);
-        }
-        ], [he2_cv_szlib_functional=yes], [he2_cv_szlib_functional=no],)])
-
-    AC_CACHE_VAL([he2_cv_szlib_can_encode],
-        [AC_TRY_RUN([
-	#include <stddef.h>
-        #include <szlib.h>
-
-        int main(void)
-        {
-            /* SZ_encoder_enabled returns 1 if encoder is present */
-            if(SZ_encoder_enabled() == 1)
-                exit(0);
-            else
-                exit(1);
-        }
-        ], [he2_cv_szlib_can_encode=yes], [he2_cv_szlib_can_encode=no],)])
+    AC_CACHE_VAL([he2_cv_szlib_functional],[he2_cv_szlib_functional=no])
+
+    AC_CACHE_VAL([he2_cv_szlib_can_encode],[he2_cv_szlib_can_encode=no])
 
     CC="$saved_CC"
     rm -f $SZIP_CC
@@ -477,22 +433,7 @@ if test "x$HAVE_HDF4" = "xyes"; then
   dnl Check if HDF4 is linked with SZIP encoder
 
   AC_MSG_CHECKING([for hdf4 szip decoding filter])
-  AC_CACHE_VAL([he2_cv_hdf4_szip_can_decode],
-      [AC_TRY_RUN([
-      #include <hdf.h>
-
-      int main(void)
-      {
-	comp_coder_t codertype = COMP_CODE_SZIP;
-	uint32 configinfo;
-	int decoder = 0;
-
-	HCget_config_info(codertype, &configinfo);
-	decoder = configinfo & COMP_DECODER_ENABLED;
-	if (decoder) exit(0);
-	else exit(1);
-      }
-      ], [he2_cv_hdf4_szip_can_decode=yes], [he2_cv_hdf4_szip_can_decode=no],)])
+  AC_CACHE_VAL([he2_cv_hdf4_szip_can_decode],[he2_cv_hdf4_szip_can_decode=no])
   if test ${he2_cv_hdf4_szip_can_decode} = "yes"; then
     AC_DEFINE(HAVE_HDF4_SZIP_DECODER, 1,
 	    [Define if HDF4 has szip decoder filter])
@@ -502,22 +443,7 @@ if test "x$HAVE_HDF4" = "xyes"; then
   fi
 
   AC_MSG_CHECKING([for hdf4 szip encoding filter])
-  AC_CACHE_VAL([he2_cv_hdf4_szip_can_encode],
-      [AC_TRY_RUN([
-      #include <hdf.h>
-
-      int main(void)
-      {
-	comp_coder_t codertype = COMP_CODE_SZIP;
-	uint32 configinfo;
-	int encoder = 0;
-
-	HCget_config_info(codertype, &configinfo);
-	encoder = configinfo & COMP_ENCODER_ENABLED;
-	if (encoder) exit(0);
-	else exit(1);
-      }
-      ], [he2_cv_hdf4_szip_can_encode=yes], [he2_cv_hdf4_szip_can_encode=no],)])
+  AC_CACHE_VAL([he2_cv_hdf4_szip_can_encode],[he2_cv_hdf4_szip_can_encode=no])
 
   if test ${he2_cv_hdf4_szip_can_encode} = "yes"; then
     AC_DEFINE(HAVE_HDF4_SZIP_ENCODER, 1,