[PATCH v2] cpupower: add checks for xgettext and msgfmt

[Siddharth Menon <simeddon@gmail.com>]

Check whether xgettext and msgfmt are available on the system before
attempting to generate the .pot and .gmo files and generate.
In case of missing dependency, generate error message directing user
to install the necessary package.

Signed-off-by: Siddharth Menon <simeddon@gmail.com>
---
 v1->v2:
 - Checks for gettext tools outside the target definitions instead
 of inline
 - Replace command with which
 
 tools/power/cpupower/Makefile | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/tools/power/cpupower/Makefile b/tools/power/cpupower/Makefile
index 6c02f401069e..e178e14d4701 100644
--- a/tools/power/cpupower/Makefile
+++ b/tools/power/cpupower/Makefile
@@ -218,29 +218,41 @@ else
 endif
 	$(QUIET) $(STRIPCMD) $@
 
+ifeq (, $(shell which xgettext))
+$(warning "Install xgettext to extract translatable strings.")
+else
 $(OUTPUT)po/$(PACKAGE).pot: $(UTIL_SRC)
 	$(ECHO) "  GETTEXT " $@
 	$(QUIET) xgettext --default-domain=$(PACKAGE) --add-comments \
 		--keyword=_ --keyword=N_ $(UTIL_SRC) -p $(@D) -o $(@F)
+endif
 
+ifeq (, $(shell which msgfmt))
+$(warning "Install msgfmt to generate binary message catalogs.")
+else
 $(OUTPUT)po/%.gmo: po/%.po
 	$(ECHO) "  MSGFMT  " $@
 	$(QUIET) msgfmt -o $@ po/$*.po
+endif
 
 create-gmo: ${GMO_FILES}
 
+ifeq (, $(shell which msgmerge))
+$(warning "Install msgmerge to merge translations.")
+else
 update-po: $(OUTPUT)po/$(PACKAGE).pot
 	$(ECHO) "  MSGMRG  " $@
 	$(QUIET) @for HLANG in $(LANGUAGES); do \
 		echo -n "Updating $$HLANG "; \
 		if msgmerge po/$$HLANG.po $< -o \
-		   $(OUTPUT)po/$$HLANG.new.po; then \
+		  $(OUTPUT)po/$$HLANG.new.po; then \
 			mv -f $(OUTPUT)po/$$HLANG.new.po $(OUTPUT)po/$$HLANG.po; \
 		else \
 			echo "msgmerge for $$HLANG failed!"; \
 			rm -f $(OUTPUT)po/$$HLANG.new.po; \
 		fi; \
 	done;
+endif
 
 compile-bench: $(OUTPUT)libcpupower.so.$(LIB_MAJ)
 	@V=$(V) confdir=$(confdir) $(MAKE) -C bench O=$(OUTPUT)
-- 
2.39.5