Avoid need for GREP variable by avoiding GNUisms. The

only one we appear to have is use of '-q'. Replace it
with redirection to /dev/null.

Also avoid use of 'tail' by replacing with 'head' or
'grep' as appropriate.

Signed-off-by: Keir Fraser <keir@xensource.com>

Config.mk

@@ -26,7 +26,7 @@ EXTRA_INCLUDES += $(EXTRA_PREFIX)/include
 EXTRA_LIB += $(EXTRA_PREFIX)/$(LIBDIR)
 endif
 
-test-gcc-flag = $(shell $(1) -v --help 2>&1 | $(GREP) -q " $(2) " && echo $(2))
+test-gcc-flag = $(shell $(1) -v --help 2>&1 | grep " $(2) " >/dev/null 2>&1 && echo $(2))
 
 ifneq ($(debug),y)
 CFLAGS += -DNDEBUG

buildconfigs/Rules.mk

@@ -22,7 +22,7 @@ endif
 
 # Expand Linux series to Linux version
 LINUX_SERIES	?= 2.6
-LINUX_VER	?= $(shell $(GREP) "^LINUX_VER " buildconfigs/mk.linux-2.6-xen | sed -e 's/.*=[ ]*//')
+LINUX_VER	?= $(shell grep "^LINUX_VER " buildconfigs/mk.linux-2.6-xen | sed -e 's/.*=[ ]*//')
 
 # Setup Linux search path
 LINUX_SRC_PATH	?= .:..
@@ -125,7 +125,7 @@ config-update-pae:
 ifeq ($(XEN_TARGET_X86_PAE),y)
 	sed -e 's!^CONFIG_HIGHMEM4G=y$$!\# CONFIG_HIGHMEM4G is not set!;s!^\# CONFIG_HIGHMEM64G is not set$$!CONFIG_HIGHMEM64G=y!' $(CONFIG_FILE) > $(CONFIG_FILE)- && mv $(CONFIG_FILE)- $(CONFIG_FILE)
 else
-	$(GREP) '^CONFIG_HIGHMEM64G=y' $(CONFIG_FILE) >/dev/null && ( sed -e 's!^CONFIG_HIGHMEM64G=y$$!\# CONFIG_HIGHMEM64G is not set!;s!^\# CONFIG_HIGHMEM4G is not set$$!CONFIG_HIGHMEM4G=y!' $(CONFIG_FILE) > $(CONFIG_FILE)- && mv $(CONFIG_FILE)- $(CONFIG_FILE) ) || true
+	grep '^CONFIG_HIGHMEM64G=y' $(CONFIG_FILE) >/dev/null && ( sed -e 's!^CONFIG_HIGHMEM64G=y$$!\# CONFIG_HIGHMEM64G is not set!;s!^\# CONFIG_HIGHMEM4G is not set$$!CONFIG_HIGHMEM4G=y!' $(CONFIG_FILE) > $(CONFIG_FILE)- && mv $(CONFIG_FILE)- $(CONFIG_FILE) ) || true
 endif
 
 # never delete any intermediate files.

config/Linux.mk

@@ -11,8 +11,6 @@ STRIP      = $(CROSS_COMPILE)strip
 OBJCOPY    = $(CROSS_COMPILE)objcopy
 OBJDUMP    = $(CROSS_COMPILE)objdump
 
-GREP       = grep
-
 INSTALL      = install
 INSTALL_DIR  = $(INSTALL) -d -m0755
 INSTALL_DATA = $(INSTALL) -m0644

config/SunOS.mk

@@ -11,7 +11,6 @@ STRIP      = $(CROSS_COMPILE)gstrip
 OBJCOPY    = $(CROSS_COMPILE)gobjcopy
 OBJDUMP    = $(CROSS_COMPILE)gobjdump
 
-GREP       = ggrep
 SHELL      = bash
 
 INSTALL      = ginstall

xen/Makefile

@@ -96,7 +96,7 @@ include/xen/compile.h: include/xen/compile.h.in
 	    -e 's/@@whoami@@/$(USER)/g' \
 	    -e 's/@@domain@@/$(shell ([ -x /bin/dnsdomainname ] && /bin/dnsdomainname) || ([ -x /bin/domainname ] && /bin/domainname || echo [unknown]))/g' \
 	    -e 's/@@hostname@@/$(shell hostname)/g' \
-	    -e 's|@@compiler@@|$(shell $(CC) $(CFLAGS) -v 2>&1 | tail -n 1 | sed -e "s;|;/;")|g' \
+	    -e 's!@@compiler@@!$(shell $(CC) $(CFLAGS) -v 2>&1 | grep -i "gcc.*version")!g' \
 	    -e 's/@@version@@/$(XEN_VERSION)/g' \
 	    -e 's/@@subversion@@/$(XEN_SUBVERSION)/g' \
 	    -e 's/@@extraversion@@/$(XEN_EXTRAVERSION)/g' \
@@ -154,7 +154,7 @@ _cscope:
 
 .PHONY: MAP
 MAP:
-	$(NM) $(TARGET) | grep -v '\(compiled\)\|\(\.o$$\)\|\( [aUw] \)\|\(\.\.ng$$\)\|\(LASH[RL]DI\)' | sort > System.map
+	$(NM) -n $(TARGET) | grep -v '\(compiled\)\|\(\.o$$\)\|\( [aUw] \)\|\(\.\.ng$$\)\|\(LASH[RL]DI\)' > System.map
 
 .PHONY: FORCE
 FORCE:

xen/arch/x86/Makefile

@@ -46,8 +46,7 @@ obj-$(crash_debug) += gdbstub.o
 
 $(TARGET): $(TARGET)-syms boot/mkelf32
 	./boot/mkelf32 $(TARGET)-syms $(TARGET) 0x100000 \
-	`$(NM) $(TARGET)-syms | sort | tail -n 1 | \
-	 sed -e 's/^\([^ ]*\).*/0x\1/'`
+	`$(NM) -nr $(TARGET)-syms | head -n 1 | sed -e 's/^\([^ ]*\).*/0x\1/'`
 
 $(TARGET)-syms: boot/$(TARGET_SUBARCH).o $(ALL_OBJS) xen.lds
 	$(MAKE) -f $(BASEDIR)/Rules.mk $(BASEDIR)/common/symbols-dummy.o