re PR fortran/36495 (libgfortran should be build with FCFLAGS -fimplicit-none)

2008-06-13  Tobias Burnus  <burnus@net-b.de>

       PR fortran/36495
       * configure: Add "-Werror -fimplicit-none" to the AM_FCFLAGS.
       * configure.ac: Ditto.
       * intrinsics/dprod_r8.f90: Add "implicit none".

From-SVN: r136740

libgfortran/ChangeLog

+2008-06-13  Tobias Burnus  <burnus@net-b.de>
+
+	PR fortran/36495
+	* configure.ac (AM_FCFLAGS): Add "-Werror -fimplicit-none".
+	* configure: (generated) ditto.
+	* intrinsics/dprod_r8.f90: Add "implicit none".
+
 2008-06-07  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
 
 	PR libfortran/36420

libgfortran/configure

@@ -3396,7 +3396,7 @@ fi
 
 # Add -Wall -fno-repack-arrays -fno-underscoring if we are using GCC.
 if test "x$GCC" = "xyes"; then
-  AM_FCFLAGS="-I . -Wall -fno-repack-arrays -fno-underscoring"
+  AM_FCFLAGS="-I . -Wall -Werror -fimplicit-none -fno-repack-arrays -fno-underscoring"
   ## We like to use C99 routines when available.  This makes sure that
   ## __STDC_VERSION__ is set such that libc includes make them available.
   AM_CFLAGS="-std=gnu99 -Wall -Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition -Wextra -Wwrite-strings"

libgfortran/configure.ac

@@ -123,7 +123,7 @@ m4_rename([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
 
 # Add -Wall -fno-repack-arrays -fno-underscoring if we are using GCC.
 if test "x$GCC" = "xyes"; then
-  AM_FCFLAGS="-I . -Wall -fno-repack-arrays -fno-underscoring"
+  AM_FCFLAGS="-I . -Wall -Werror -fimplicit-none -fno-repack-arrays -fno-underscoring"
   ## We like to use C99 routines when available.  This makes sure that
   ## __STDC_VERSION__ is set such that libc includes make them available.
   AM_CFLAGS="-std=gnu99 -Wall -Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition -Wextra -Wwrite-strings"

libgfortran/intrinsics/dprod_r8.f90

@@ -20,6 +20,7 @@
 
 
 elemental function _gfortran_specific__dprod_r8 (p1, p2)
+   implicit none
    real (kind=4), intent (in) :: p1, p2
    real (kind=8) :: _gfortran_specific__dprod_r8