[build] Enable building with the Intel C compiler (icc)

src/Makefile.housekeeping

@@ -60,6 +60,22 @@ HOST_OS		:= $(shell uname -s)
 hostos :
 	@$(ECHO) $(HOST_OS)
 
+###############################################################################
+#
+# Determine compiler
+
+CCDEFS		:= $(shell $(CC) -E -x c -c /dev/null -dM | cut -d" " -f2)
+ccdefs:
+	@$(ECHO) $(CCDEFS)
+
+ifeq ($(filter __ICC,$(CCDEFS)),__ICC)
+CCTYPE		:= icc
+else
+CCTYPE		:= gcc
+endif
+cctype:
+	@$(ECHO) $(CCTYPE)
+
 ###############################################################################
 #
 # Check for tools that can cause failed builds
@@ -103,10 +119,12 @@ oldgas :
 # default, even when -ffreestanding is specified.  We therefore need
 # to disable -fstack-protector if the compiler supports it.
 #
+ifeq ($(CCTYPE),gcc)
 SP_TEST = $(CC) -fno-stack-protector -x c -c /dev/null \
 		-o /dev/null >/dev/null 2>&1
 SP_FLAGS := $(shell $(SP_TEST) && $(ECHO) '-fno-stack-protector')
 CFLAGS	+= $(SP_FLAGS)
+endif
 
 ###############################################################################
 #
@@ -279,9 +297,38 @@ ifdef BIN
 # Common flags
 #
 CFLAGS		+= -I include -I arch/$(ARCH)/include -I .
-CFLAGS		+= -Os -ffreestanding
-CFLAGS		+= -Wall -W -Wformat-nonliteral
+CFLAGS		+= -Os
 CFLAGS		+= -g
+ifeq ($(CCTYPE),gcc)
+CFLAGS		+= -ffreestanding
+CFLAGS		+= -Wall -W -Wformat-nonliteral
+endif
+ifeq ($(CCTYPE),icc)
+CFLAGS		+= -fno-builtin
+CFLAGS		+= -no-ip
+CFLAGS		+= -no-gcc
+CFLAGS		+= -diag-disable 111 # Unreachable code
+CFLAGS		+= -diag-disable 128 # Unreachable loop
+CFLAGS		+= -diag-disable 170 # Array boundary checks
+CFLAGS		+= -diag-disable 177 # Unused functions
+CFLAGS		+= -diag-disable 181 # printf() format checks
+CFLAGS		+= -diag-disable 188 # enum strictness
+CFLAGS		+= -diag-disable 193 # Undefined preprocessor identifiers
+CFLAGS		+= -diag-disable 280 # switch ( constant )
+CFLAGS		+= -diag-disable 310 # K&R parameter lists
+CFLAGS		+= -diag-disable 424 # Extra semicolon
+CFLAGS		+= -diag-disable 589 # Declarations mid-code
+CFLAGS		+= -diag-disable 593 # Unused variables
+CFLAGS		+= -diag-disable 810 # Casting ints to smaller ints
+CFLAGS		+= -diag-disable 981 # Sequence point violations
+CFLAGS		+= -diag-disable 1292 # Ignored attributes
+CFLAGS		+= -diag-disable 1338 # void pointer arithmetic
+CFLAGS		+= -diag-disable 1361 # Variable-length arrays
+CFLAGS		+= -diag-disable 1418 # Missing prototypes
+CFLAGS		+= -diag-disable 1419 # Missing prototypes
+CFLAGS		+= -diag-disable 1599 # Hidden variables
+CFLAGS		+= -Wall -Wmissing-declarations
+endif
 CFLAGS		+= $(EXTRA_CFLAGS)
 ASFLAGS		+= $(EXTRA_ASFLAGS)
 LDFLAGS		+= $(EXTRA_LDFLAGS)
@@ -314,11 +361,21 @@ OBJ_CFLAGS	= $(CFLAGS_$(OBJECT)) -DOBJECT=$(subst -,_,$(OBJECT))
 $(BIN)/%.flags :
 	@$(ECHO) $(OBJ_CFLAGS)
 
+# ICC requires postprocessing objects to fix up table alignments
+#
+ifeq ($(CCTYPE),icc)
+POST_O		= && $(ICCFIX) $@
+POST_O_DEPS	:= $(ICCFIX)
+else
+POST_O		:=
+POST_O_DEPS	:=
+endif
+
 # Rules for specific object types.
 #
 COMPILE_c	= $(CC) $(CFLAGS) $(CFLAGS_c) $(OBJ_CFLAGS)
-RULE_c		= $(Q)$(COMPILE_c) -c $< -o $@
-RULE_c_to_dbg%.o = $(Q)$(COMPILE_c) -Ddebug_$(OBJECT)=$* -c $< -o $@
+RULE_c		= $(Q)$(COMPILE_c) -c $< -o $@ $(POST_O)
+RULE_c_to_dbg%.o = $(Q)$(COMPILE_c) -Ddebug_$(OBJECT)=$* -c $< -o $@ $(POST_O)
 RULE_c_to_c	= $(Q)$(COMPILE_c) -E -c $< > $@
 RULE_c_to_s	= $(Q)$(COMPILE_c) -S -g0 -c $< -o $@
 
@@ -364,15 +421,17 @@ endef
 define obj_template
 
 	@$(CPP) $(CFLAGS) $(CFLAGS_$(3)) $(CFLAGS_$(4)) -DOBJECT=$(4) \
-		-Wno-error -MM $(1) -MT "$(4)_DEPS" -MG -MP | \
-		sed 's/_DEPS\s*:/_DEPS =/' >> $(2)
-	@$(ECHO_E) '\n$$(BIN)/$(4).o : $(1) $$(MAKEDEPS) $$($(4)_DEPS)' \
+		-Wno-error -MM $(1) -MG -MP | \
+		sed 's/\.o\s*:/_DEPS =/' >> $(2)
+	@$(ECHO_E) '\n$$(BIN)/$(4).o :' \
+		 '$(1) $$(MAKEDEPS) $$(POST_O_DEPS) $$($(4)_DEPS)' \
 		 '\n\t$$(QM)$(ECHO) "  [BUILD] $$@"' \
 		 '\n\t$$(RULE_$(3))\n' \
 		 '\nBOBJS += $$(BIN)/$(4).o\n' \
 		 $(foreach TGT,$(DEBUG_TARGETS), \
 		    $(if $(RULE_$(3)_to_$(TGT)), \
-		    '\n$$(BIN)/$(4).$(TGT) : $(1) $$(MAKEDEPS) $$($(4)_DEPS)' \
+		    '\n$$(BIN)/$(4).$(TGT) :' \
+		    '$(1) $$(MAKEDEPS) $$(POST_O_DEPS) $$($(4)_DEPS)' \
 		    '\n\t$$(QM)$(ECHO) "  [BUILD] $$@"' \
 		    '\n\t$$(RULE_$(3)_to_$(TGT))\n' \
 		    '\n$(TGT)_OBJS += $$(BIN)/$(4).$(TGT)\n' ) ) \
@@ -743,6 +802,15 @@ $(EFIROM) : util/efirom.c $(MAKEDEPS)
 	$(Q)$(HOST_CC) -idirafter include -O2 -o $@ $<
 CLEANUP += $(EFIROM)
 
+###############################################################################
+#
+# The ICC fixup utility
+#
+$(ICCFIX) : util/iccfix.c $(MAKEDEPS)
+	$(QM)$(ECHO) "  [HOSTCC] $@"
+	$(Q)$(HOST_CC) -idirafter include -O2 -o $@ $<
+CLEANUP += $(ICCFIX)
+
 ###############################################################################
 #
 # Auto-incrementing build serial number.  Append "bs" to your list of