makefiles: Suppress stray backslash warnings with grep 3.8

GNU grep 3.8 warns about "\#" when compiling. The "#" has to be
escaped for Makefiles and shell, but it isn't special to grep so
grep thinks it's an invalid escape sequence.

Change-Id: Ieb2607d42b7daa1939ca0101b915ec0c7afd4298

apps/apps.make

@@ -24,7 +24,7 @@ $(BUILDDIR)/apps/features: $(APPSDIR)/features.txt  $(BUILDDIR)/firmware/common/
 	$(call PRINTS,PP $(<F))
 	$(SILENT)$(CC) $(PPCFLAGS) \
                  -E -P -imacros "config.h" -imacros "button.h" -x c $< | \
-		grep -v "^\#" | grep -v "^ *$$" > $(BUILDDIR)/apps/features; \
+		grep -v "^#" | grep -v "^ *$$" > $(BUILDDIR)/apps/features; \
 
 $(BUILDDIR)/apps/genlang-features:  $(BUILDDIR)/apps/features
 	$(call PRINTS,GEN $(subst $(BUILDDIR)/,,$@))tr \\n : < $< > $@

manual/Makefile

@@ -59,7 +59,7 @@ $(OBJDIR)/features.tex: $(ROOTDIR)/apps/features.txt
 	$(SILENT) for f in \
 	    $$(cat $< | $(HOSTCC) -DMEMORYSIZE=$(MEMORYSIZE) $(INCLUDES) \
 	       $(TARGET) $(DEFINES) $(EXTRA_DEFINES) -E -P -imacros "config.h" \
-	       -imacros "button.h" - | grep -v "^\#" | grep -v "^$$"); \
+	       -imacros "button.h" - | grep -v "^#" | grep -v "^$$"); \
 	    do feat="$$feat\\n\\\\edef\\\\UseOption{\\\\UseOption,$$f}"; done ; \
 	printf "$$feat" > $@
 

tools/functions.make

@@ -15,11 +15,11 @@
 # The sed line is to prepend the directory to all source files
 
 preprocess = $(shell $(CC) $(PPCFLAGS) $(2) -E -P -x c -include config.h $(1) | \
-		grep -v '^\#' | grep -v "^ *$$" | \
+		grep -v '^#' | grep -v "^ *$$" | \
 		sed -e 's:^..*:$(dir $(1))&:')
 
-preprocess2file = $(SILENT)$(CC) $(PPCFLAGS) $(3) -E -P -x c -include config.h $(1) | \
-		grep -v '^\#' | grep -v "^$$" > $(2)
+preprocess2file = $(shell $(CC) $(PPCFLAGS) $(3) -E -P -x c -include config.h $(1) | \
+		grep -v '^#' | grep -v "^$$" > $(2))
 
 asmdefs2file = $(SILENT)$(CC) $(PPCFLAGS) $(3) -S -x c -o - -include config.h $(1) | \
 	perl -ne 'if(/^_?AD_(\w+):$$/){$$var=$$1}else{/^\W\.(?:word|long)\W(.*)$$/ && $$var && print "\#define $$var $$1\n";$$var=0}' > $(2)

tools/makesrc.inc

@@ -11,4 +11,4 @@
 
 SRC := $(shell cat SOURCES | $(CC) -DMEMORYSIZE=$(MEMORYSIZE) $(INCLUDES) \
 $(TARGET) $(DEFINES) $(EXTRA_DEFINES) -E -P -include "config.h" - 2>/dev/null \
-| grep -v "^\#")
+| grep -v "^#")

utils/hwstub/stub/hwstub.make

@@ -8,7 +8,7 @@ LDFLAGS=-lgcc -Os -nostdlib -T$(TMP_LDS) -Wl,-Map,$(TMP_MAP) $(INCLUDES) -L$(BUI
 
 SRC:=$(shell cat $(ROOT_DIR)/SOURCES | $(CC) $(INCLUDES) \
     $(DEFINES) -E -P -include "config.h" - 2>/dev/null \
-    | grep -v "^\#")
+    | grep -v "^#")
 SRC:=$(foreach src,$(SRC),$(BUILD_DIR)/$(src))
 OBJ=$(SRC:.c=.o)
 OBJ:=$(OBJ:.S=.o)