Check for the mex -R2017b option in configure

Since we use mex for linking, but CXX for compiling, we also need to
set a preprocessor macro to emulate the -R2017b option. Currently we
use -DMATLAB_MEXCMD_RELEASE=700, but it is unclear if this is the
recommended way.

This is required to build with Matlab R2018a and newer.

1 files changed, 18 insertions, 2 deletions

diff --git a/build/linux/acinclude.m4 b/build/linux/acinclude.m4
index d6866c3..135c1c6 100644
--- a/build/linux/acinclude.m4
+++ b/build/linux/acinclude.m4
@@ -38,8 +38,7 @@ extern "C" void mexFunction() {
 }
 _ACEOF
 $CXX -fPIC -c -o conftest.o conftest.cc
-$MEX -cxx -output conftest conftest.o
-$2=""
+$MEX -cxx -output conftest conftest.o >/dev/null 2>&1
 for suffix in $1; do
   if test -f "conftest.$suffix"; then
     $2="$suffix"
@@ -49,6 +48,23 @@ done
 rm -f conftest.cc conftest.o
 ])
 
+dnl ASTRA_CHECK_MEX_OPTION(option, mex-suffix, action-if-supported, action-if-not-supported)
+dnl Check if an option is supported by mex.
+dnl We test if mex works by testing if it produces a mex file as output;
+dnl this is required since 'mex' is also a commonly installed LaTeX format
+AC_DEFUN([ASTRA_CHECK_MEX_OPTION],[
+cat >conftest.cc <<_ACEOF
+extern "C" void mexFunction() {
+}
+_ACEOF
+$CXX -fPIC -c -o conftest.o conftest.cc
+$MEX $1 -cxx -output conftest conftest.o >/dev/null 2>&1
+AS_IF([test -f "conftest.$2"],[
+  rm -f "conftest.$2"
+  $3],[$4])
+rm -f conftest.cc conftest.o
+])
+
 
 dnl ASTRA_RUN_STOREOUTPUT(command, output)
 AC_DEFUN([ASTRA_RUN_STOREOUTPUT],[{