Part of automake VI patch from Ralf Corsepius <corsepiu@faw.uni-ulm.de>:

> 2) rtems-rc-19990131-1.diff
>
> Rework of compilers/*.cfg files (esp. gcc-target-default.cfg) to adapt
> the flags/makefile variables to automake and make standards (cf.
> make.info - implicit rules/variables).
>
> This patch is rather risky and may probably break things, but is an
> essential step towards automake.
>
> FWIW: It also reverts the i386-ASMFLAGS/ASFLAGS-patch, which was wrong,
> as I had to experience ;-.

c/src/make/compilers/gcc-target-default.cfg

@@ -4,10 +4,6 @@
 #  $Id$
 # 
 
-CPPFLAGS=$(CFLAGS) $(XCPPFLAGS)
-
-CPLUS_CPPFLAGS=$(CFLAGS) $(XCPPFLAGS)
-
 ##
 # CFLAGS_OPTIMIZE_V, CFLAGS_DEBUG_V, CFLAGS_PROFILE_V are the values we
 # would want the corresponding macros to be set to.
@@ -17,6 +13,14 @@ CPLUS_CPPFLAGS=$(CFLAGS) $(XCPPFLAGS)
 #
 
 # default flags
+# XCPPFLAGS, XCFLAGS, XCXXFLAGS, XASFLAGS 
+# are used to add flags from the shell
+# cf. make.info ("Implicit rules/variables" for details)
+
+CPPFLAGS = $(CPU_DEFINES) $(DEFINES) $(XCPPFLAGS)
+CFLAGS   = $(CPU_CFLAGS) -g -Wall -ansi -fasm $(XCFLAGS)
+CXXFLAGS = $(CPU_CFLAGS) -g -Wall -ansi -fasm $(XCXXFLAGS)
+ASFLAGS  = $(CPU_ASFLAGS) $(XASFLAGS)
 
 # We only include the header files for networking if it is enabled.
 INCLUDE_NETWORKING_yes_V = -I$(PROJECT_INCLUDE)/networking
@@ -30,27 +34,19 @@ RTEMS_LIBC_INCLUDES := -I$(RTEMS_LIBC_DIR)/include
 endif
 
 # Used for posix bsps
-CFLAGS_DEFAULT = $(CPU_DEFINES) $(CPU_CFLAGS) -Wall -ansi -fasm -g \
-  -I$(PROJECT_INCLUDE) \
-  $(INCLUDE_NETWORKING) \
-  $(RTEMS_LIBC_INCLUDES) $(DEFINES)
-
-ASMFLAGS=$(CPU_DEFINES) $(CPU_CFLAGS) -g \
-  -I$(PROJECT_INCLUDE) \
-  $(RTEMS_LIBC_INCLUDES) $(DEFINES)
+CPPFLAGS += \
+  -I$(PROJECT_INCLUDE) $(INCLUDE_NETWORKING) \
+  $(RTEMS_LIBC_INCLUDES)
 else
 # Used for embedded bsps
 # Ask gcc where it finds its own include files
 GCC_INCLUDE=$(shell $(CC) $(CPU_CFLAGS) -print-file-name=include $(GCCSED))
 
-CFLAGS_DEFAULT = $(CPU_DEFINES) $(CPU_CFLAGS) -Wall -ansi -fasm -g \
-  -nostdinc -I$(PROJECT_INCLUDE) \
-  $(INCLUDE_NETWORKING) \
-  -I$(RTEMS_LIBC_DIR)/include -I$(GCC_INCLUDE) $(DEFINES)
-
-ASMFLAGS=$(CPU_DEFINES) $(CPU_CFLAGS) -g \
-  -nostdinc -I$(PROJECT_INCLUDE) \
-  -I$(RTEMS_LIBC_DIR)/include -I$(GCC_INCLUDE) $(DEFINES)
+CPPFLAGS += -nostdinc \
+  -I$(PROJECT_INCLUDE) $(INCLUDE_NETWORKING) \
+  -I$(GCC_INCLUDE) \
+  -I$(RTEMS_LIBC_DIR)/sys-include \
+  -I$(RTEMS_LIBC_DIR)/include
 endif
 
 # default location of Standard C Library
@@ -98,7 +94,7 @@ endif
 
 # when debugging, optimize flag: typically empty
 # some compilers do allow optimization with their "-g"
-#CFLAGS_DEBUG_OPTIMIZE_V=
+CFLAGS_DEBUG_OPTIMIZE_V=-g
 
 # profile flag; use gprof(1)
 CFLAGS_PROFILE_V=-pg
@@ -107,10 +103,10 @@ CFLAGS_PROFILE_V=-pg
 CFLAGS_OPTIMIZE=$(CFLAGS_OPTIMIZE_V)
 
 # dynamic libraries
-CFLAGS_DYNAMIC_V=-fpic
+#CFLAGS_DYNAMIC_V=-fpic
 #ASFLAGS_DYNAMIC_V=
 
-CFLAGS=$(CFLAGS_DEFAULT) $(CFLAGS_OPTIMIZE) $(CFLAGS_DEBUG) $(CFLAGS_PROFILE)
+CFLAGS += $(CFLAGS_OPTIMIZE) $(CFLAGS_DEBUG) $(CFLAGS_PROFILE)
 
 # List of library paths without -L
 LD_PATHS= $(PROJECT_RELEASE)/lib
@@ -156,10 +152,8 @@ CLOBBER_CC =
 CPP=$(CC) -E -ansi -w -Wp,-$$
 
 # flags set by cc when running cpp
-CPP_CC_FLAGS=-D__STDC__
-
-ASFLAGS= $(CPU_ASFLAGS)
-ASM4FLAGS := -I $(PROJECT_INCLUDE)
+# NOTE: CPP_CC_FLAGS does not seem to be used anywhere
+# CPP_CC_FLAGS=-D__STDC__
 
 # egrep regexp to ignore symbol table entries in ar archives.
 # Only used to make sure we skip them when coalescing libraries.
@@ -173,14 +167,15 @@ ARFLAGS=ruv
 # NOTE: Obsolete, use $(RANLIB) instead, MKLIB may disappear soon 
 MKLIB=$(RANLIB)
 
+
 #
 # How to compile stuff into ${ARCH} subdirectory
 #
 # NOTE: we override COMPILE.c
 #
 
-COMPILE.c=$(CC) $(CFLAGS) $(XCFLAGS) -c
-COMPILE.cc=$(CXX) $(CFLAGS) $(CXXFLAGS) $(XCFLAGS) -c
+COMPILE.c=$(CC) $(CPPFLAGS) $(CFLAGS) -c
+COMPILE.cc=$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c
 
 ${ARCH}/%.o: %.c
 	${COMPILE.c} -o $@ $<
@@ -191,26 +186,9 @@ ${ARCH}/%.o: %.cc
 # strip out C++ style comments.
 ${ARCH}/%.o: %.S
 	sed -e 's/\/\/.*$$//' < $< | \
-	    $(CPP) $(ASMFLAGS) -I. -I$(srcdir) -DASM - >$(ARCH)/$*.i
+	    $(CPP) $(CPPFLAGS) -I. -I$(srcdir) -DASM - >$(ARCH)/$*.i
 	$(AS) $(ASFLAGS) -o $@ $(ARCH)/$*.i
 
-# Specify our own default rule for this to prevent having CFLAGS and
-#  CPPFLAGS being passed to linker
-#
-#
-# NOTE (Ralf): Having this rule is a bug, IMO.
-# I have only kept it for the moment because some (broken) Makefiles 
-# might need it.
-#
-# ${ARCH}/%: ${ARCH}/%.o
-#	${CC} ${LDFLAGS} -o $@ $@.o ${LD_LIBS}
-#
-# Anyway, the rule above is wrong. The one below should be correct
-# (But this one should also not be necessary. If something breaks now,
-# have a look at the Makefile or custom/*.cfg :-)
-# $(ARCH)/%.exe: $(ARCH)/%.o
-#	$(make-exe)
-
 # Make foo.rel from foo.o
 ${ARCH}/%.rel: ${ARCH}/%.o
 	${LD} $(LDFLAGS_INCOMPLETE) -o $@ $^