[PATCH v3] 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 GNU gettext Language Translations.
In case of missing dependency, generate warning 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
 v2->v3:
 - Update commit message
 
 tools/power/cpupower/Makefile | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/tools/power/cpupower/Makefile b/tools/power/cpupower/Makefile
index 6c02f401069e..84987f91d11f 100644
--- a/tools/power/cpupower/Makefile
+++ b/tools/power/cpupower/Makefile
@@ -218,17 +218,28 @@ 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 \
@@ -241,6 +252,7 @@ update-po: $(OUTPUT)po/$(PACKAGE).pot
 			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