Define the common build variables in the Makefiles.

  - Define these variables globally on the Makefile. This way anything
    invoked downwards from this Makefile can pick up these variables
    without us having to set them for every sub invocation manually.

Makefile.in

@@ -2,6 +2,15 @@
 
 defaultMakefileTarget = Makefile.unix
 
+host=@host@
+host_short=@host_short@
+CC=@CC@
+CXX=@CXX@
+CPPFLAGS=@CPPFLAGS@
+CFLAGS=@CFLAGS@
+CXXFLAGS=@CXXFLAGS@
+LDFLAGS=@LDFLAGS@
+
 CMAKE = @CMAKE@
 # Use the system's default cmake if nothing is passed to configure script, i.e., no CMAKE=<some_path> is specified
 ifeq ($(CMAKE),)
@@ -17,9 +26,9 @@ omc: omc.skip
 omc.skip:
 	$(MAKE) -C OMCompiler @OMC_TARGET@
 omlibrary-core:
-	$(MAKE) -C libraries BUILD_DIR=@OMBUILDDIR@/lib/omlibrary "host_short=@host_short@" "RPATH_QMAKE=@RPATH_QMAKE@ @CMAKE_LDFLAGS@" "SHREXT=@SHREXT@" core
+	$(MAKE) -C libraries BUILD_DIR=@OMBUILDDIR@/lib/omlibrary "RPATH_QMAKE=@RPATH_QMAKE@ @CMAKE_LDFLAGS@" "SHREXT=@SHREXT@" core
 omlibrary-all:
-	$(MAKE) -C libraries BUILD_DIR=@OMBUILDDIR@/lib/omlibrary "host_short=@host_short@" "RPATH_QMAKE=@RPATH_QMAKE@ @CMAKE_LDFLAGS@" "SHREXT=@SHREXT@" all
+	$(MAKE) -C libraries BUILD_DIR=@OMBUILDDIR@/lib/omlibrary "RPATH_QMAKE=@RPATH_QMAKE@ @CMAKE_LDFLAGS@" "SHREXT=@SHREXT@" all
 omplot: omplot.skip
 omplot.skip: omc
 	test -f $@ || $(MAKE) -C OMPlot
@@ -31,12 +40,12 @@ omedit-testsuite.skip: omedit.skip testsuite-depends
 	$(MAKE) -f $(defaultMakefileTarget) -C OMEdit/Testsuite
 omparser: omparser.skip
 omparser.skip:
-	test -f $@ || $(MAKE) -C OMParser OMBUILDDIR=@OMBUILDDIR@ "host_short=@host_short@" CC="@CC@" CXX="@CXX@" CFLAGS="@CFLAGS@" CPPFLAGS="@CPPFLAGS@" CXXFLAGS="@CXXFLAGS@" CMAKE=$(CMAKE)
+	test -f $@ || $(MAKE) -C OMParser OMBUILDDIR=@OMBUILDDIR@ CMAKE=$(CMAKE)
 omsimulator: omsimulator.skip
 omsimulator.skip:
-	$(MAKE) -C OMSimulator config-3rdParty CERES=OFF "host_short=@host_short@" CC="@CC@" CXX="@CXX@" CFLAGS="@CFLAGS@" CPPFLAGS="@CPPFLAGS@" CXXFLAGS="@CXXFLAGS@" CMAKE=$(CMAKE)
-	$(MAKE) -C OMSimulator config-OMSimulator OMBUILDDIR=@OMBUILDDIR@ OMSYSIDENT=OFF "host_short=@host_short@" CC="@CC@" CXX="@CXX@" CFLAGS="@CFLAGS@" CPPFLAGS="@CPPFLAGS@" CXXFLAGS="@CXXFLAGS@" CMAKE=$(CMAKE)
-	$(MAKE) -C OMSimulator OMBUILDDIR=@OMBUILDDIR@ "host_short=@host_short@" CC="@CC@" CC="@CC@" CXX="@CXX@" CFLAGS="@CFLAGS@" CPPFLAGS="@CPPFLAGS@" CXXFLAGS="@CXXFLAGS@" CMAKE=$(CMAKE)
+	$(MAKE) -C OMSimulator config-3rdParty CERES=OFF CMAKE=$(CMAKE)
+	$(MAKE) -C OMSimulator config-OMSimulator OMBUILDDIR=@OMBUILDDIR@ OMSYSIDENT=OFF CMAKE=$(CMAKE)
+	$(MAKE) -C OMSimulator OMBUILDDIR=@OMBUILDDIR@ CMAKE=$(CMAKE)
 omsimulator-debug:
 	$(MAKE) omsimulator BUILD_TYPE=Debug
 omnotebook: omnotebook.skip
@@ -50,7 +59,7 @@ omshell.skip: omc
 	$(MAKE) -C OMShell
 omc-diff: omc-diff.skip
 omc-diff.skip:
-	$(MAKE) -C testsuite/difftool "OMBUILDDIR=@OMBUILDDIR@" CC="@CC@" CFLAGS="@CFLAGS@"
+	$(MAKE) -C testsuite/difftool "OMBUILDDIR=@OMBUILDDIR@"
 ReferenceFiles: ReferenceFiles.skip
 ReferenceFiles.skip:
 	$(MAKE) -C testsuite/ReferenceFiles