improve alignment autoconf test (#1129)

Replace the deprecated AC_TRY_RUN with AC_RUN_IFELSE. Also, standardize the
variable name and allow for caching of the result.

1 files changed, 25 insertions, 10 deletions

diff --git a/configure b/configure
index 87504d2..ac16ce7 100755
--- a/configure
+++ b/configure
@@ -784,6 +784,7 @@ infodir
 docdir
 oldincludedir
 includedir
+runstatedir
 localstatedir
 sharedstatedir
 sysconfdir
@@ -894,6 +895,7 @@ datadir='${datarootdir}'
 sysconfdir='${prefix}/etc'
 sharedstatedir='${prefix}/com'
 localstatedir='${prefix}/var'
+runstatedir='${localstatedir}/run'
 includedir='${prefix}/include'
 oldincludedir='/usr/include'
 docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
@@ -1146,6 +1148,15 @@ do
   | -silent | --silent | --silen | --sile | --sil)
     silent=yes ;;
 
+  -runstatedir | --runstatedir | --runstatedi | --runstated \
+  | --runstate | --runstat | --runsta | --runst | --runs \
+  | --run | --ru | --r)
+    ac_prev=runstatedir ;;
+  -runstatedir=* | --runstatedir=* | --runstatedi=* | --runstated=* \
+  | --runstate=* | --runstat=* | --runsta=* | --runst=* | --runs=* \
+  | --run=* | --ru=* | --r=*)
+    runstatedir=$ac_optarg ;;
+
   -sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
     ac_prev=sbindir ;;
   -sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
@@ -1283,7 +1294,7 @@ fi
 for ac_var in	exec_prefix prefix bindir sbindir libexecdir datarootdir \
 		datadir sysconfdir sharedstatedir localstatedir includedir \
 		oldincludedir docdir infodir htmldir dvidir pdfdir psdir \
-		libdir localedir mandir
+		libdir localedir mandir runstatedir
 do
   eval ac_val=\$$ac_var
   # Remove trailing slashes.
@@ -1436,6 +1447,7 @@ Fine tuning of the installation directories:
   --sysconfdir=DIR        read-only single-machine data [PREFIX/etc]
   --sharedstatedir=DIR    modifiable architecture-independent data [PREFIX/com]
   --localstatedir=DIR     modifiable single-machine data [PREFIX/var]
+  --runstatedir=DIR       modifiable per-process data [LOCALSTATEDIR/run]
   --libdir=DIR            object code libraries [EPREFIX/lib]
   --includedir=DIR        C header files [PREFIX/include]
   --oldincludedir=DIR     C header files for non-gcc [/usr/include]
@@ -9738,8 +9750,11 @@ esac
 # check for systems that require aligned memory access
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking aligned memory access is required" >&5
 $as_echo_n "checking aligned memory access is required... " >&6; }
-if test "$cross_compiling" = yes; then :
-  aligned_required=yes
+if ${ac_cv_aligned_required+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test "$cross_compiling" = yes; then :
+  ac_cv_aligned_required=yes
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
@@ -9756,26 +9771,26 @@ int main()
         return 1;
     return 0;
 }
-
 _ACEOF
 if ac_fn_c_try_run "$LINENO"; then :
-  aligned_required=no
+  ac_cv_aligned_required=no
 else
-  aligned_required=yes
+  ac_cv_aligned_required=yes
 fi
 rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
   conftest.$ac_objext conftest.beam conftest.$ac_ext
 fi
 
 
-if test "$aligned_required" = yes ; then
+fi
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_aligned_required" >&5
+$as_echo "$ac_cv_aligned_required" >&6; }
+if test "$ac_cv_aligned_required" = yes ; then
 
 $as_echo "#define HAVE_ALIGNED_REQUIRED 1" >>confdefs.h
 
 fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $aligned_required" >&5
-$as_echo "$aligned_required" >&6; }
-
 
 # str, bytes and memoryview hash algorithm