1 files changed, 76 insertions, 0 deletions
diff --git a/aclocal/prog-cxx.m4 b/aclocal/prog-cxx.m4
new file mode 100644
index 0000000000..47a61ba57e
--- /dev/null
+++ b/aclocal/prog-cxx.m4
@@ -0,0 +1,76 @@
+dnl
+dnl $Id$
+dnl 
+dnl Check for target g++
+dnl 
+dnl Adaptation of autoconf-2.12's AC_PROG_CXX to rtems
+dnl
+dnl 98/02/10 Ralf Corsepius (corsepiu@faw.uni-ulm.de)
+dnl
+ 
+AC_DEFUN(RTEMS_PROG_CXX,
+[
+AC_BEFORE([$0], [AC_PROG_CXXCPP])dnl
+AC_BEFORE([$0], [AC_PROG_CXX])dnl
+AC_CHECK_PROGS(CXX, $CCC c++ g++ gcc CC cxx cc++, gcc)
+
+RTEMS_PROG_CXX_WORKS
+AC_PROG_CXX_GNU
+
+if test $ac_cv_prog_gxx = yes; then
+  GXX=yes
+dnl Check whether -g works, even if CXXFLAGS is set, in case the package
+dnl plays around with CXXFLAGS (such as to build both debugging and
+dnl normal versions of a library), tasteless as that idea is.
+  ac_test_CXXFLAGS="${CXXFLAGS+set}"
+  ac_save_CXXFLAGS="$CXXFLAGS"
+  CXXFLAGS=
+  AC_PROG_CXX_G
+  if test "$ac_test_CXXFLAGS" = set; then
+    CXXFLAGS="$ac_save_CXXFLAGS"
+  elif test $ac_cv_prog_cxx_g = yes; then
+    CXXFLAGS="-g -O2"
+  else
+    CXXFLAGS="-O2"
+  fi
+else
+  GXX=
+  test "${CXXFLAGS+set}" = set || CXXFLAGS="-g"
+fi
+CXX_FOR_TARGET=$CXX
+
+dnl restore initial values
+unset CXX
+unset ac_cv_prog_gxx
+])
+
+
+dnl Almost identical to AC_PROG_CXX_WORKS
+dnl Additional handling of malloc
+dnl NOTE: using newlib with a native compiler is cross-compiling, indeed.
+AC_DEFUN(RTEMS_PROG_CXX_WORKS,
+[AC_MSG_CHECKING([whether the target C++ compiler ($CXX $CXXFLAGS $LDFLAGS) works])
+AC_LANG_SAVE
+AC_LANG_CPLUSPLUS
+
+dnl this fails if rtems uses newlib, because rtems has its own malloc which
+dnl is not available at bootstrap
+AC_TRY_COMPILER(
+  [main(){return(0);}], 
+  rtems_cv_prog_cxx_works, rtems_cv_prog_cxx_cross)
+if test "$rtems_cv_prog_cxx_works" = "no"; then
+  dnl now retry with our own version of malloc
+  AC_TRY_COMPILER(
+    [extern "C" void *malloc(); 
+     void *malloc() { return (0); }
+     main(){return(0);}],
+    rtems_cv_prog_cxx_works, rtems_cv_prog_cxx_cross)
+fi
+AC_LANG_RESTORE
+AC_MSG_RESULT($rtems_cv_prog_cxx_works)
+if test $rtems_cv_prog_cxx_works = no; then
+  AC_MSG_ERROR([installation or configuration problem: target C++ compiler cannot create executables.])
+fi
+AC_MSG_CHECKING([whether the target C++ compiler ($CXX $CXXFLAGS $LDFLAGS) is a cross-compiler])
+AC_MSG_RESULT($rtems_cv_prog_cxx_cross)
+])