Use separate config_*.h files for BUILD and HOST when cross-compiling

We have only been lucky so far that there hasn't been any compilation errors
caused by using the HOST platform config_*.h files also for the BUILD
platform. But as more and more information found out during configury is
stored in config_*.h files, sooner or later it will be a problem.

Move config/* to config_host/*. When not cross-compiling, the config_*.h files
in config_host expanded from config_*.h.in are all there is. When
cross-compiling, the generated config_*.h files for the BUILD platform are
put into a config_build folder.

Then use config_build when building the cross_toolset and config_host
otherwise.

Change-Id: I3c28cc83866bffd696b45d00dfb68e00bc2ae538

.gitignore

@@ -46,6 +46,7 @@
 /config_host.mk
 /config_host.mk.last
 /config_host.mk.stamp
+/config_build/config_*.h
 /config_build.mk
 /configure
 /Makefile

Makefile.in

@@ -46,7 +46,7 @@ else # MAKE_RESTARTS
 all: build
 
 ifeq ($(gb_Side),)
-gb_Side:=host
+export gb_Side:=host
 endif
 
 include $(BUILDDIR)/config_$(gb_Side).mk

configure.ac

@@ -4114,7 +4114,7 @@ if test "$cross_compiling" = "yes"; then
         config_host.mk.in \
         configure \
         Makefile.in \
-        config/config_*.h.in \
+        config_host/config_*.h.in \
         bin/get_config_variables \
         solenv/bin/getcompver.awk \
         solenv/inc/langlist.mk \
@@ -4170,6 +4170,8 @@ if test "$cross_compiling" = "yes"; then
     test -f ./config_host.mk 2>/dev/null || exit
     cp config_host.mk ../config_build.mk
     cp config.log ../config.Build.log
+    mkdir -p ../config_build
+    cp config_host/*.h ../config_build
     . ./bin/get_config_variables COM GUI OS PATH CPU CPUNAME CC CXX DISABLE_PYTHON MACOSX_DEPLOYMENT_TARGET INPATH OUTPATH PYTHON SYSTEM_LIBXSLT OUTDIR SOLARINC SOLARLIB WORKDIR
 
     for V in COM GUI OS CPU CPUNAME CC CXX DISABLE_PYTHON MACOSX_DEPLOYMENT_TARGET INPATH OUTPATH \
@@ -12308,12 +12310,12 @@ else
 fi
 
 AC_CONFIG_FILES([config_host.mk Makefile solenv/inc/minor.mk instsetoo_native/util/openoffice.lst])
-AC_CONFIG_HEADERS([config/config_clang.h])
-AC_CONFIG_HEADERS([config/config_global.h])
-AC_CONFIG_HEADERS([config/config_graphite.h])
-AC_CONFIG_HEADERS([config/config_telepathy.h])
-AC_CONFIG_HEADERS([config/config_vclplug.h])
-AC_CONFIG_HEADERS([config/config_version.h])
+AC_CONFIG_HEADERS([config_host/config_clang.h])
+AC_CONFIG_HEADERS([config_host/config_global.h])
+AC_CONFIG_HEADERS([config_host/config_graphite.h])
+AC_CONFIG_HEADERS([config_host/config_telepathy.h])
+AC_CONFIG_HEADERS([config_host/config_vclplug.h])
+AC_CONFIG_HEADERS([config_host/config_version.h])
 AC_OUTPUT
 
 # touch the config timestamp file

cross_tail_build/Makefile

@@ -30,6 +30,8 @@ ifeq ($(strip $(SOLARENV)),)
 include $(dir $(realpath $(firstword $(MAKEFILE_LIST))))/../config_build.mk
 endif
 
+export gb_Side=build
+
 include $(SOLARENV)/gbuild/gbuild.mk
 
 $(eval $(call gb_Module_make_global_targets,$(SRCDIR)/Module_cross_tail_build.mk))

cross_toolset/Makefile

@@ -6,6 +6,8 @@
 SHELL=/usr/bin/env bash
 include ../config_build.mk
 
+export gb_Side=build
+
 .PHONY : build
 
 build:

solenv/gbuild/platform/com_GCC_defs.mk

@@ -157,7 +157,7 @@ gb_DEBUG_CXXFLAGS := $(FNO_DEFAULT_INLINE)
 
 gb_LinkTarget_INCLUDE :=\
     $(subst -I. , ,$(SOLARINC)) \
-    -I$(BUILDDIR)/config \
+    -I$(BUILDDIR)/config_$(gb_Side) \
 
 ifeq ($(COM_GCC_IS_CLANG),TRUE)
 ifeq ($(COMPILER_PLUGIN_TOOL),)