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-rw-r--r--include/prereq.mk48
1 files changed, 46 insertions, 2 deletions
diff --git a/include/prereq.mk b/include/prereq.mk
index 45ee77e9e6..d3b73663e3 100644
--- a/include/prereq.mk
+++ b/include/prereq.mk
@@ -1,5 +1,5 @@
#
-# Copyright (C) 2006-2007 OpenWrt.org
+# Copyright (C) 2006-2015 OpenWrt.org
#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
@@ -20,12 +20,16 @@ prereq:
.SILENT: prereq
endif
+PREREQ_PREV=
+
+# 1: display name
+# 2: error message
define Require
export PREREQ_CHECK=1
ifeq ($$(CHECK_$(1)),)
prereq: prereq-$(1)
- prereq-$(1): FORCE
+ prereq-$(1): $(if $(PREREQ_PREV),prereq-$(PREREQ_PREV)) FORCE
echo -n "Checking '$(1)'... "
if $(NO_TRACE_MAKE) -f $(firstword $(MAKEFILE_LIST)) check-$(1) >/dev/null 2>/dev/null; then \
echo 'ok.'; \
@@ -41,6 +45,8 @@ define Require
.SILENT: prereq-$(1) check-$(1)
.NOTPARALLEL:
endif
+
+ PREREQ_PREV=$(1)
endef
@@ -60,3 +66,41 @@ define RequireHeader
$$(eval $$(call Require,$(1),$(2)))
endef
+define QuoteHostCommand
+'$(subst ','"'"',$(strip $(1)))'
+endef
+
+# 1: display name
+# 2: failure message
+# 3: test
+define TestHostCommand
+ define Require/$(1)
+ ($(3)) >/dev/null 2>/dev/null
+ endef
+
+ $$(eval $$(call Require,$(1),$(2)))
+endef
+
+# 1: canonical name
+# 2: failure message
+# 3+: candidates
+define SetupHostCommand
+ define Require/$(1)
+ for cmd in $(call QuoteHostCommand,$(3)) $(call QuoteHostCommand,$(4)) \
+ $(call QuoteHostCommand,$(5)) $(call QuoteHostCommand,$(6)) \
+ $(call QuoteHostCommand,$(7)) $(call QuoteHostCommand,$(8)); do \
+ if [ -n "$$$$$$$$cmd" ]; then \
+ bin="$$$$$$$$(PATH="$(subst $(space),:,$(filter-out $(STAGING_DIR_HOST)/%,$(subst :,$(space),$(PATH))))" \
+ which "$$$$$$$${cmd%% *}")"; \
+ if [ -x "$$$$$$$$bin" ] && eval "$$$$$$$$cmd" >/dev/null 2>/dev/null; then \
+ mkdir -p "$(STAGING_DIR_HOST)/bin"; \
+ ln -sf "$$$$$$$$bin" "$(STAGING_DIR_HOST)/bin/$(strip $(1))"; \
+ exit 0; \
+ fi; \
+ fi; \
+ done; \
+ exit 1
+ endef
+
+ $$(eval $$(call Require,$(1),$(if $(2),$(2),Missing $(1) command)))
+endef