[Bugfix] Prevent definition of HAVE_BOOST without value due to race conditions...

[Bugfix] Prevent definition of HAVE_BOOST without value due to race conditions in some autoconf versions.

For some autoconf versions there was a race condition between ax_boost_base.m4 and dune_boost_base.m4 resulting in HAVE_BOOST being defined with no value (instead of ENABLE_BOOST). For others there were even two definitions of it (one with and one without value). 

This patch renames the symbol being defined in dune_boost_base.m4 to HAVE_DUNE_BOOST and defines a value for it if boost is found.

Please change your code such the preprocessor directives checking for boost from
#if HAVE_BOOST
to
#if HAVE_DUNE_BOOST

Resolves flyspray 1265 and presumably 1249.

[[Imported from SVN: r7422]]

.gitignore

@@ -24,3 +24,5 @@ dune-common-?.?
 ltmain.sh
 .libs
 dependencies.m4
+config.guess
+config.h.in

cmake/modules/DuneBoost.cmake

@@ -5,7 +5,7 @@
 # Adds boost compiler flags and libraries, and activates
 # Boost for the specified targets.
 find_package(Boost)
-set(HAVE_BOOST ${Boost_FOUND})
+set(HAVE_DUNE_BOOST ${Boost_FOUND})
 
 function(add_dune_boost_flags _targets)
   if(Boost_FOUND)

config.h.cmake

@@ -45,7 +45,7 @@
 #cmakedefine HAVE_BLAS 1
 
 /* Define to ENABLE_BOOST if the Boost library is available */
-#cmakedefine HAVE_BOOST ENABLE_BOOST
+#cmakedefine HAVE_DUNE_BOOST ENABLE_BOOST
 
 /* Define to 1 if you have <boost/make_shared.hpp>. */
 #cmakedefine HAVE_BOOST_MAKE_SHARED_HPP 1

m4/dune_boost_base.m4

@@ -17,7 +17,7 @@
 #
 #   And sets:
 #
-#     HAVE_BOOST
+#     HAVE_DUNE_BOOST
 #        ENABLE_BOOST or undefined. Whether boost was found. The correct way to
 #        to check this is "#if HAVE_BOOST": This way boost features will be disabled
 #        unless ${BOOST_CPPFLAGS} was given when compiling
@@ -25,7 +25,7 @@
 AC_DEFUN([DUNE_BOOST_BASE],
 [
 AX_BOOST_BASE([$1],[
-  AC_DEFINE(HAVE_BOOST, [ENABLE_BOOST],[Define to ENABLE_BOOST if the Boost library is available])
+  AC_DEFINE(HAVE_DUNE_BOOST, [ENABLE_BOOST],[Define to ENABLE_BOOST if the Boost library is available])
   BOOST_CPPFLAGS="$BOOST_CPPFLAGS -DENABLE_BOOST"
   AC_SUBST(BOOST_CPPFLAGS)
   # execute ACTION-IF-FOUND (if present):