Add the usage of MRUBY_ROOT to the mrbgems build system, so that we can easily build everywhere

Makefile

@@ -7,6 +7,8 @@ export LL = gcc
 export AR = ar
 export YACC = bison
 
+MRUBY_ROOT := $(realpath .)
+
 ifeq ($(strip $(ENABLE_GEMS)),)
   # by default GEMs are deactivated
   ENABLE_GEMS = false
@@ -32,9 +34,9 @@ endif
 
 ALL_CFLAGS = -Wall -Werror-implicit-function-declaration $(CFLAGS)
 ifeq ($(OS),Windows_NT)
-  MAKE_FLAGS = --no-print-directory CC=$(CC) LL=$(LL) ALL_CFLAGS='$(ALL_CFLAGS)' ENABLE_GEMS='$(ENABLE_GEMS)' ACTIVE_GEMS='$(ACTIVE_GEMS)'
+  MAKE_FLAGS = --no-print-directory CC=$(CC) LL=$(LL) ALL_CFLAGS='$(ALL_CFLAGS)' ENABLE_GEMS='$(ENABLE_GEMS)' ACTIVE_GEMS='$(ACTIVE_GEMS)' MRUBY_ROOT='$(MRUBY_ROOT)'
 else
-  MAKE_FLAGS = --no-print-directory CC='$(CC)' LL='$(LL)' ALL_CFLAGS='$(ALL_CFLAGS)' ENABLE_GEMS='$(ENABLE_GEMS)' ACTIVE_GEMS='$(ACTIVE_GEMS)'
+  MAKE_FLAGS = --no-print-directory CC='$(CC)' LL='$(LL)' ALL_CFLAGS='$(ALL_CFLAGS)' ENABLE_GEMS='$(ENABLE_GEMS)' ACTIVE_GEMS='$(ACTIVE_GEMS)' MRUBY_ROOT='$(MRUBY_ROOT)'
 endif
 
 ##############################

mrbgems/Makefile

 # makefile description.
 # add gems to the ruby library
 
+ifeq ($(strip $(MRUBY_ROOT)),)
+  MRUBY_ROOT := $(realpath ..)
+endif
+
 LIBR := ../lib/libmruby.a
 RM_F := rm -f
 CC_FLAGS := -Wall -Werror-implicit-function-declaration -g -O3 -MMD -I. -I./../include
@@ -9,7 +13,7 @@ export CC = gcc
 export LL = gcc
 export AR = ar
 
-GENERATOR := ./generator
+GENERATOR := $(MRUBY_ROOT)/mrbgems/generator
 ifeq ($(OS),Windows_NT)
   GENERATOR_BIN := $(GENERATOR).exe
 else
@@ -40,7 +44,7 @@ all_gems : $(GENERATOR_BIN)
 	@echo "Generate Gem Makefile"
 	$(GENERATOR_BIN) makefile "$(ACTIVE_GEMS)" > $(GEM_MAKEFILE)
 	@echo "Build all gems"
-	$(MAKE) -C g
+	$(MAKE) -C g MRUBY_ROOT='$(MRUBY_ROOT)' ACTIVE_GEMS="$(ACTIVE_GEMS)"
 
 $(GEM_INIT).c : $(GENERATOR_BIN)
 	@echo "Generate Gem driver"
@@ -61,12 +65,12 @@ $(GENERATOR).o : $(GENERATOR).c
 
 .PHONY : prepare-test
 prepare-test :
-	@$(MAKE) prepare-test -C g ACTIVE_GEMS="$(ACTIVE_GEMS)"
+	@$(MAKE) prepare-test -C g ACTIVE_GEMS="$(ACTIVE_GEMS)" MRUBY_ROOT='$(MRUBY_ROOT)'
 
 # clean driver and all gems
 .PHONY : clean
 clean : $(GENERATOR_BIN)
 	@echo "Cleanup Gems"
 	$(GENERATOR_BIN) makefile "$(ACTIVE_GEMS)" > $(GEM_MAKEFILE)
-	$(MAKE) clean -C g
+	$(MAKE) clean -C g ACTIVE_GEMS="$(ACTIVE_GEMS)" MRUBY_ROOT='$(MRUBY_ROOT)'
 	-$(RM_F) $(GEM_INIT).c *.o *.d $(GENERATOR_BIN) $(GEM_MAKEFILE) $(GEM_MAKEFILE_LIST) gem_init.a

mrbgems/Makefile4gem

@@ -4,7 +4,7 @@
 
 ifeq ($(strip $(MRUBY_ROOT)),)
   # mruby src root
-  MRUBY_ROOT := ../../../
+  MRUBY_ROOT := $(realpath ../../..)
 endif
 
 # Tools
@@ -15,13 +15,13 @@ AR := ar
 SRC_DIR := src
 MRB_DIR := mrblib
 
-INCLUDES := -I$(SRC_DIR) -I$(MRUBY_ROOT)include -I$(MRUBY_ROOT)src -I.
+INCLUDES := -I$(SRC_DIR) -I$(MRUBY_ROOT)/include -I$(MRUBY_ROOT)/src -I.
 CFLAGS := $(INCLUDES) -O3 -g -Wall -Werror-implicit-function-declaration
 
 # LIBR can be manipulated with command line arguments
 ifeq ($(strip $(LIBR)),)
   # default mruby library
-  LIBR := $(MRUBY_ROOT)lib/libmruby.a
+  LIBR := $(MRUBY_ROOT)/lib/libmruby.a
 endif
 
 GEM_PACKAGE := mrb-$(GEM)-gem.a
@@ -49,14 +49,14 @@ gem_mixlib.c : gem_mrblib_header.ctmp gem_mrblib_irep.ctmp gem_mixlib_init.ctmp
 	cat $^ > $@
 
 gem_mixlib_init.ctmp :
-	$(MRUBY_ROOT)mrbgems/generator gem_mixlib $(GEM) "$(ACTIVE_GEMS)" > $@
+	$(MRUBY_ROOT)/mrbgems/generator gem_mixlib $(GEM) "$(ACTIVE_GEMS)" > $@
 
 # Building target for C files
 gem-c-files : gem_srclib.o
 	$(AR) rs $(GEM_PACKAGE) $(GEM_OBJECTS) $<
 
 gem_srclib.c :
-	$(MRUBY_ROOT)mrbgems/generator gem_srclib $(GEM) "$(ACTIVE_GEMS)" > $@
+	$(MRUBY_ROOT)/mrbgems/generator gem_srclib $(GEM) "$(ACTIVE_GEMS)" > $@
 
 # Building target for Ruby Files
 gem-rb-files : gem_mrblib.o
@@ -66,13 +66,13 @@ gem_mrblib.c : gem_mrblib_header.ctmp gem_mrblib_irep.ctmp gem_mrblib_init.ctmp
 	cat $^ > $@
 
 gem_mrblib_header.ctmp :
-	$(MRUBY_ROOT)mrbgems/generator gem_mrblib "$(ACTIVE_GEMS)" > $@
+	$(MRUBY_ROOT)/mrbgems/generator gem_mrblib "$(ACTIVE_GEMS)" > $@
 
 gem_mrblib_init.ctmp :
-	$(MRUBY_ROOT)mrbgems/generator gem_mrblib $(GEM) "$(ACTIVE_GEMS)" > $@
+	$(MRUBY_ROOT)/mrbgems/generator gem_mrblib $(GEM) "$(ACTIVE_GEMS)" > $@
 
 gem_mrblib_irep.ctmp : gem_mrblib.rbtmp
-	$(MRUBY_ROOT)bin/mrbc -Bgem_mrblib_irep_$(GEM) -o$@ $<
+	$(MRUBY_ROOT)/bin/mrbc -Bgem_mrblib_irep_$(GEM) -o$@ $<
 
 gem_mrblib.rbtmp :
 	cat $(GEM_RB_FILES) > $@

mrbgems/generator.c

@@ -129,11 +129,15 @@ make_gem_makefile(char active_gems[1024])
   char *gem_check = { 0 };
   int gem_empty;
 
-  printf("CFLAGS := -I. -I../../include -I../../src\n\n"
+  printf("ifeq ($(strip $(MRUBY_ROOT)),)\n"
+         "  MRUBY_ROOT := $(realpath ../../..)\n"
+         "endif\n\n"
+         "MAKEFILE_4_GEM := $(MRUBY_ROOT)/mrbgems/Makefile4gem\n\n"
+         "CFLAGS := -I. -I$(MRUBY_ROOT)/include -I$(MRUBY_ROOT)/src\n\n"
          "ifeq ($(OS),Windows_NT)\n"
-         "MAKE_FLAGS = --no-print-directory CC=$(CC) LL=$(LL) ALL_CFLAGS='$(ALL_CFLAGS)'\n"
+         "  MAKE_FLAGS = --no-print-directory CC=$(CC) LL=$(LL) ALL_CFLAGS='$(ALL_CFLAGS)' MRUBY_ROOT='$(MRUBY_ROOT)' MAKEFILE_4_GEM='$(MAKEFILE_4_GEM)'\n"
          "else\n"
-         "MAKE_FLAGS = --no-print-directory CC='$(CC)' LL='$(LL)' ALL_CFLAGS='$(ALL_CFLAGS)'\n"
+         "  MAKE_FLAGS = --no-print-directory CC='$(CC)' LL='$(LL)' ALL_CFLAGS='$(ALL_CFLAGS)' MRUBY_ROOT='$(MRUBY_ROOT)' MAKEFILE_4_GEM='$(MAKEFILE_4_GEM)'\n"
          "endif\n\n");
 
   /* is there any GEM available? */
@@ -168,9 +172,9 @@ make_gem_makefile(char active_gems[1024])
            for_each_gem(" ", "/test/*.rb ", "\tcat", " > mrbgemtest.rbtmp", TRUE, active_gems)
           );
   else
-    printf("\t../generator rbtmp \"%s\"> mrbgemtest.rbtmp", active_gems);
+    printf("\t$(MRUBY_ROOT)/mrbgems/generator rbtmp \"%s\"> mrbgemtest.rbtmp", active_gems);
 
-  printf("\n\t../../bin/mrbc -Bmrbgemtest_irep -omrbgemtest.ctmp mrbgemtest.rbtmp\n\n");
+  printf("\n\t$(MRUBY_ROOT)/bin/mrbc -Bmrbgemtest_irep -omrbgemtest.ctmp mrbgemtest.rbtmp\n\n");
 
   /* Makefile Rules to Clean GEMs */