ENH: add enable language support for PROJECT command, this means that a C only project can be built with cmake, even without a cxx compiler

1 files changed, 165 insertions, 0 deletions

diff --git a/Templates/cxxconfigure.in b/Templates/cxxconfigure.in
new file mode 100644
index 0000000..4529e0d
--- /dev/null
+++ b/Templates/cxxconfigure.in
@@ -0,0 +1,165 @@
+# Process this file with autoconf to produce a configure script.
+AC_INIT()
+
+
+#
+# check for some programs we use
+#
+
+# save the CXXFLAGS specified by the user
+save_CXXFLAGS=$CXXFLAGS
+
+AC_PROG_CXX
+
+
+# restore the flags specified by the user and get rid of any flags
+# found by autoconf (we do not want -02 -g by default)
+CXXFLAGS=$save_CXXFLAGS
+
+
+CMAKE_NO_EXPLICIT_TEMPLATE_INSTANTIATION=""
+if test $ac_cv_prog_gxx = no; then
+    echo $ac_n "checking whether ${CXX} supports explicit instantiation""... $ac_c" 1>&6
+  echo 'template<class T>class x{};template class x<int>;' > conftest.cc
+  if test -z "`${CXX} -c conftest.cc 2>&1`"; then
+    echo "$ac_t""yes" 1>&6
+  else
+    echo "$ac_t""no" 1>&6
+    CMAKE_NO_EXPLICIT_TEMPLATE_INSTANTIATION="1"
+  fi
+  rm -f conftest*
+fi
+# if running on darwin no explicit template instantiations even though
+# syntax is supported.
+case $system in 
+  Darwin*) 
+    CMAKE_NO_EXPLICIT_TEMPLATE_INSTANTIATION="1"
+    ;;
+esac
+AC_SUBST(CMAKE_NO_EXPLICIT_TEMPLATE_INSTANTIATION)
+
+CMAKE_ANSI_CXXFLAGS=""
+# on hp use -Aa for ansi
+if test $ac_cv_prog_gxx = no; then
+case $system in
+     IRIX-5* | IRIX-6* | IRIX64-6* | IRIX-64-6*)
+        echo $ac_n "checking whether ${CXX} accepts -LANG:std""... $ac_c" 1>&6
+        echo 'void f(){}' > conftest.c
+        if test -z "`${CXX} -LANG:std -c conftest.c 2>&1`"; then
+          echo "$ac_t""yes" 1>&6
+	  CMAKE_ANSI_CXXFLAGS="-LANG:std"
+        else
+          echo "$ac_t""no" 1>&6
+        fi
+        rm -f conftest*
+	;;  
+esac
+fi
+AC_SUBST(CMAKE_ANSI_CXXFLAGS)
+
+# if we are not running g++ then we might need some other flags
+# to get the templates compiled correctly
+CMAKE_TEMPLATE_FLAGS=""
+if test $ac_cv_prog_gxx = no; then
+    echo $ac_n "checking whether ${CXX} accepts -ptused -no_prelink""... $ac_c" 1>&6
+  echo 'void f(){}' > conftest.cc
+  if test -z "`${CXX} -ptused -no_prelink -c conftest.cc 2>&1`"; then
+    echo "$ac_t""yes" 1>&6
+    CMAKE_TEMPLATE_FLAGS="-ptused -no_prelink"
+  else
+    echo "$ac_t""no" 1>&6
+  fi
+  rm -f conftest*
+fi
+AC_SUBST(CMAKE_TEMPLATE_FLAGS)
+
+
+# check no g++ compilers to see if they have the standard 
+# ansi stream files (without the .h)
+if test $ac_cv_prog_gxx = no; then
+  AC_MSG_CHECKING( ansi standard C++ stream headers ) 
+  rm -rf conftest.*
+  cat > conftest.cc <<!
+#include <iostream>
+!
+  if test -z "`${CXX} ${CMAKE_ANSI_CXXFLAGS} $CXXFLAGS $CPPFLAGS -c conftest.cc 2>&1`"; then
+    echo "$ac_t""yes" 1>&6
+  else
+    CMAKE_NO_ANSI_STREAM_HEADERS="1"
+    echo "$ac_t""no" 1>&6
+  fi
+fi
+AC_SUBST(CMAKE_NO_ANSI_STREAM_HEADERS)
+
+# check to see if stl is in the std namespace
+if test $ac_cv_prog_gxx = no; then
+  AC_MSG_CHECKING( ansi standard namespace support ) 
+  rm -rf conftest.*
+  cat > conftest.cc <<!
+#include <list>
+void foo() { std::list<int> l; }
+!
+  if test -z "`${CXX}  ${CMAKE_ANSI_CXXFLAGS} $CXXFLAGS $CPPFLAGS -c conftest.cc 2>&1`"; then
+    echo "$ac_t""yes" 1>&6
+  else
+    CMAKE_NO_STD_NAMESPACE="1"
+    echo "$ac_t""no" 1>&6
+  fi
+fi
+AC_SUBST(CMAKE_NO_STD_NAMESPACE)
+
+# check to see if for scoping is supported
+if test $ac_cv_prog_gxx = no; then
+  AC_MSG_CHECKING( ansi for scope support ) 
+  rm -rf conftest.*
+  cat > conftest.cc <<!
+void foo() { for(int i;;); for(int i;;); }
+!
+  if test -z "`${CXX} ${CMAKE_ANSI_CXXFLAGS} $CXXFLAGS $CPPFLAGS -c conftest.cc 2>&1`"; then
+    echo "$ac_t""yes" 1>&6
+  else
+    CMAKE_NO_ANSI_FOR_SCOPE="1"
+    echo "$ac_t""no" 1>&6
+  fi
+fi
+AC_SUBST(CMAKE_NO_ANSI_FOR_SCOPE)
+
+
+# find make to use to build cmake, prefer gmake
+AC_PATH_PROGS(CMAKE_AR_TMP, ar)
+CMAKE_AR="$CMAKE_AR_TMP"
+CMAKE_AR_ARGS="cr"
+# if on SunOS and not using gXX then use the compiler to make .a libs
+case $system in 
+   SunOS-5*)
+   if test $ac_cv_prog_gxx = yes; then
+	:
+   else
+      echo "Using $CXX -xar -o for creating .a libraries"
+      CMAKE_AR="$CXX"
+      CMAKE_AR_ARGS="-xar -o"
+   fi
+   ;;
+   IRIX*)
+   if test $ac_cv_prog_gxx = yes; then
+	:
+   else
+      echo "Using $CXX -xar -o for creating .a libraries"
+      CMAKE_AR="$CXX"
+      CMAKE_AR_ARGS="-ar -o"
+   fi
+   ;;
+esac
+AC_SUBST(CMAKE_AR)
+AC_SUBST(CMAKE_AR_ARGS)
+
+CMAKE_COMPILER_IS_GNUGXX=0
+if test $ac_cv_prog_gxx = yes; then
+	CMAKE_COMPILER_IS_GNUCXX=1
+fi
+
+AC_SUBST(CMAKE_COMPILER_IS_GNUCXX)
+# generate output files.
+# create mkdir files just to make some of the directories
+
+AC_OUTPUT( CXXCMakeSystemConfig.cmake )