kill gb_MINISOLARENV in favor of stages

Makefile

@@ -26,23 +26,18 @@
 #
 #*************************************************************************
 
-gb_SOURCEANDRERUN:=
-SRCDIR:=$(realpath $(dir $(realpath $(firstword $(MAKEFILE_LIST)))))
-ifeq ($(strip $(SOLARENV)),)
-ifneq ($(MAKECMDGOALS),$(SRCDIR)/Env.Host.sh)
-gb_SOURCEANDRERUN:=T
-gb_MINISOLARENV:=
-else
-SOLARENV:=$(SRCDIR)/solenv
-gb_MINISOLARENV:=T
+SRCDIR:=$(patsubst %/,%,$(dir $(realpath $(firstword $(MAKEFILE_LIST)))))
+
+ifeq ($(strip $(gb_SourceEnvAndRecurse_STAGE)),)
+include $(SRCDIR)/solenv/gbuild/source_and_rerun.mk
 endif
+
+ifeq ($(gb_SourceEnvAndRecurse_STAGE),reconfigure)
+SOLARENV:=$(SRCDIR)/solenv
 endif
 
-ifneq ($(gb_SOURCEANDRERUN),)
-include $(dir $(realpath $(firstword $(MAKEFILE_LIST))))/solenv/gbuild/source_and_rerun.mk
-else
+ifneq ($(filter reconfigure gbuild buildpl,$(gb_SourceEnvAndRecurse_STAGE)),)
 include $(SOLARENV)/gbuild/gbuild.mk
 $(eval $(call gb_Module_make_global_targets,$(wildcard $(SRCDIR)/RepositoryModule_*.mk)))
 endif
-
 # vim: set noet sw=4 ts=4:

solenv/gbuild/extensions/post_AuxTargets.mk

@@ -50,7 +50,7 @@ fetch: $(SRCDIR)/src.downloaded
 
 # fixme: can we prevent these exports in the first place?
 $(SRCDIR)/Env.Host.sh: autogen.lastrun configure.in ooo.lst.in set_soenv.in
-	$(if $(gb_MINISOLARENV),$(SRCDIR)/autogen.sh,@echo "cannot reconfigure from within solarenv" && rm -f $(SRCDIR)/Env.Host.sh && exit 2)
+	$(if $(filter reconfigure,$(gb_SourceEnvAndRecurse_STAGE)),$(SRCDIR)/autogen.sh,@echo "cannot reconfigure from within solarenv" && rm -f $(SRCDIR)/Env.Host.sh && exit 2)
 
 $(WORKDIR)/bootstrap:
 	@cd $(SRCDIR) && ./bootstrap

solenv/gbuild/gbuild.mk

@@ -151,7 +151,7 @@ $(eval $(call gb_Helper_collect_libtargets))
 gb_Library_DLLPOSTFIX := lo
 
 # Include platform/cpu/compiler specific config/definitions
-ifeq ($(strip $(gb_MINISOLARENV)),)
+ifneq ($(filter gbuild buidpl,$(gb_SourceEnvAndRecurse_STAGE)),)
 include $(GBUILDDIR)/platform/$(OS)_$(CPUNAME)_$(COM).mk
 endif