cpp revisited: look for a cpp binary in various locations for use at runtime

Certain programs like dtlogin and tt_type_comp need access to the
system's cpp command to process certain files at runtime.  tradcpp is
not installed on most systems, and is intended for use as a imake-cpp
replacement which is all we are using it for.  We still need an
honest cpp for the CDE components to use.

Now, we look in various places for a 'cpp' command and set CPP_COMMAND
to it's value.  This way tt_type_comp and other CDE programs can do
required processing at runtime.

cde/configure.ac

@@ -216,8 +216,11 @@ AC_PROG_CXX
 
 AC_PROG_CPP
 
-dnl we need a real preprocessor, not gcc -E.  We will call it GENCPP.  We will
-dnl go with BSD's tradcpp here...
+dnl we need a real preprocessor, not gcc -E.  We will call it GENCPP.
+dnl We will go with BSD's tradcpp here...  This is used for
+dnl pre-processing during building of CDE - in the way imake used to
+dnl do.  This is not a replacement for cpp, used at runtime by
+dnl software such as tt_type_comp.
 AC_SUBST(GENCPP, '$(top_builddir)/util/tradcpp/tradcpp')
 
 AM_PROG_LIBTOOL
@@ -254,6 +257,13 @@ dnl programs with full paths
 
 AC_PATH_PROG(KSH, ksh)
 AC_PATH_PROG(XRDB, xrdb)
+dnl we need to use cpp for some things, like tooltalk and other
+dnl runtime uses.  So look for the system's cpp.  NOTE: this is NOT
+dnl the CPP (gcc -E) set by AC_PROG_CPP.  At this point I don't know
+dnl if we should even bother looking for that as we can't really use
+dnl it.
+AC_PATH_PROG(CPP_PROGRAM, cpp, ,
+       [/lib:/usr/bin:/usr/ccs/lib/:/usr/lib:/usr/libexec:/opt/langtools/lbin:$PATH])
 
 dnl programs
 AC_CHECK_PROGS(BDFTOPCF, bdftopcf)

cde/lib/tt/bin/tt_type_comp/Makefile.am

@@ -12,7 +12,7 @@ mp_types_gram.h:
 bin_PROGRAMS = tt_type_comp
 
 tt_type_comp_CXXFLAGS = -I../../lib -I../../slib \
-			$(TT_VERSION_DEFINE) -DCPP_PROGRAM="\"$(GENCPP)\""
+			$(TT_VERSION_DEFINE) -DCPP_PROGRAM="\"$(CPP_PROGRAM)\""
 
 tt_type_comp_SOURCES = mp_type_comp.C        mp_types_table.C \
 		frozen.mp_types_lex.C frozen.mp_types_gram.C

cde/programs/dtlogin/Makefile.am

@@ -8,13 +8,11 @@ DEF_SERVER = $(XBINDIR)/X
 DEF_USER_PATH = $(PATH):$(XBINDIR)
 DEF_SYSTEM_PATH = $(PATH):$(XBINDIR)
 
-CPP_PROGRAM = $(prefix)/bin/traddcpp
-
-DEF_BM_PATH = $(CDE_CONFIGURATION_TOP)/appconfig/icons/%L/%B%M.bm:$(CDE_CONFIGURATION_TOP)/appconfig/icons/%L/%B%M.pm:$(CDE_CONFIGURATION_TOP)/appconfig/icons/%L/%B:$(CDE_CONFIGURATION_TOP)/appconfig/icons/C/%B%M.bm:$(CDE_CONFIGURATION_TOP)/appconfig/icons/C/%B%M.pm:$(CDE_CONFIGURATION_TOP)/appconfig/icons/C/%B:${prefix}/appconfig/icons/%L/%B%M.bm:${prefix}/appconfig/icons/%L/%B%M.pm:${prefix}/appconfig/icons/%L/%B:${prefix}/appconfig/icons/C/%B%M.bm:${prefix}/appconfig/icons/C/%B%M.pm:${prefix}/appconfig/icons/C/%B
-DEF_PM_PATH = $(CDE_CONFIGURATION_TOP)/appconfig/icons/%L/%B%M.pm:$(CDE_CONFIGURATION_TOP)/appconfig/icons/%L/%B%M.bm:$(CDE_CONFIGURATION_TOP)/appconfig/icons/%L/%B:$(CDE_CONFIGURATION_TOP)/appconfig/icons/C/%B%M.pm:$(CDE_CONFIGURATION_TOP)/appconfig/icons/C/%B%M.bm:$(CDE_CONFIGURATION_TOP)/appconfig/icons/C/%B:${prefix}/appconfig/icons/%L/%B%M.pm:${prefix}/appconfig/icons/%L/%B%M.bm:${prefix}/appconfig/icons/%L/%B:${prefix}/appconfig/icons/C/%B%M.pm:${prefix}/appconfig/icons/C/%B%M.bm:${prefix}/appconfig/icons/C/%B
+DEF_BM_PATH = $(CDE_CONFIGURATION_TOP)/appconfig/icons/%L/%B%M.bm:$(CDE_CONFIGURATION_TOP)/appconfig/icons/%L/%B%M.pm:$(CDE_CONFIGURATION_TOP)/appconfig/icons/%L/%B:$(CDE_CONFIGURATION_TOP)/appconfig/icons/C/%B%M.bm:$(CDE_CONFIGURATION_TOP)/appconfig/icons/C/%B%M.pm:$(CDE_CONFIGURATION_TOP)/appconfig/icons/C/%B:$(CDE_INSTALLATION_TOP)/appconfig/icons/%L/%B%M.bm:$(CDE_INSTALLATION_TOP)/appconfig/icons/%L/%B%M.pm:$(CDE_INSTALLATION_TOP)/appconfig/icons/%L/%B:$(CDE_INSTALLATION_TOP)/appconfig/icons/C/%B%M.bm:$(CDE_INSTALLATION_TOP)/appconfig/icons/C/%B%M.pm:$(CDE_INSTALLATION_TOP)/appconfig/icons/C/%B
+DEF_PM_PATH = $(CDE_CONFIGURATION_TOP)/appconfig/icons/%L/%B%M.pm:$(CDE_CONFIGURATION_TOP)/appconfig/icons/%L/%B%M.bm:$(CDE_CONFIGURATION_TOP)/appconfig/icons/%L/%B:$(CDE_CONFIGURATION_TOP)/appconfig/icons/C/%B%M.pm:$(CDE_CONFIGURATION_TOP)/appconfig/icons/C/%B%M.bm:$(CDE_CONFIGURATION_TOP)/appconfig/icons/C/%B:$(CDE_INSTALLATION_TOP)/appconfig/icons/%L/%B%M.pm:$(CDE_INSTALLATION_TOP)/appconfig/icons/%L/%B%M.bm:$(CDE_INSTALLATION_TOP)/appconfig/icons/%L/%B:$(CDE_INSTALLATION_TOP)/appconfig/icons/C/%B%M.pm:$(CDE_INSTALLATION_TOP)/appconfig/icons/C/%B%M.bm:$(CDE_INSTALLATION_TOP)/appconfig/icons/C/%B
 
 AM_CFLAGS = -DCDE_CONFIGURATION_TOP=\"$(CDE_CONFIGURATION_TOP)\" \
-            -DCDE_INSTALLATION_TOP=\"${prefix}\" \
+            -DCDE_INSTALLATION_TOP=\"$(CDE_INSTALLATION_TOP)\" \
             -DCDE_LOGFILES_TOP=\"$(CDE_LOGFILES_TOP)\" \
 	    -I/usr/include/freetype2 -DBINDIR=\"$(XBINDIR)\" \
 	    -DXDMDIR=\"$(XDMDIR)\" \
@@ -30,9 +28,9 @@ dtlogin_SOURCES = access.c account.c auth.c genauth.c daemon.c dm.c \
 noinst_LIBRARIES = libresource.a
 libresource_a_SOURCES = resource.c
 libresource_a_CFLAGS = $(AM_CFLAGS) \
-		 -DDEF_SESSION=\"${prefix}/bin/Xsession\" \
+		 -DDEF_SESSION=\"$(CDE_INSTALLATION_TOP)/bin/Xsession\" \
 		 -DDEF_SYSTEM_SHELL=\"/bin/sh\" \
-                 -DDEF_CHOOSER=\"${prefix}/bin/dtchooser\" \
+                 -DDEF_CHOOSER=\"$(CDE_INSTALLATION_TOP)/bin/dtchooser\" \
                  -DDEF_XDM_CONFIG=\"Xconfig\" -DSIGNALRETURNSINT \
 		 -DDEF_SERVER_LINE=\"":0 Local local $(DEF_SERVER) :0"\" \
                  -DXRDB_PROGRAM=\"$(XRDB)\" \