1# 
2# Copyright (C) 2006-2007 OpenWrt.org
3#
4# This is free software, licensed under the GNU General Public License v2.
5# See /LICENSE for more information.
6#
7
8ifneq ($(__prereq_inc),1)
9__prereq_inc:=1
10
11prereq:
12	if [ -f $(TMP_DIR)/.prereq-error ]; then \
13		echo; \
14		cat $(TMP_DIR)/.prereq-error; \
15		rm -f $(TMP_DIR)/.prereq-error; \
16		echo; \
17		false; \
18	fi
19
20.SILENT: prereq
21endif
22
23define Require
24  export PREREQ_CHECK=1
25  ifeq ($$(CHECK_$(1)),)
26    prereq: prereq-$(1)
27
28    prereq-$(1): FORCE
29		echo -n "Checking '$(1)'... "
30		if $(NO_TRACE_MAKE) -f $(firstword $(MAKEFILE_LIST)) check-$(1) >/dev/null 2>/dev/null; then \
31			echo 'ok.'; \
32		else \
33			echo 'failed.'; \
34			echo -e "$(PKG_NAME): $(strip $(2))" | perl -ne 's/\\\s*/\n/g,print' >> $(TMP_DIR)/.prereq-error; \
35		fi
36
37    check-$(1): FORCE
38	  $(call Require/$(1))
39    CHECK_$(1):=1
40
41    .SILENT: prereq-$(1) check-$(1)
42  endif
43endef
44
45
46define RequireCommand
47  define Require/$(1)
48    which $(1)
49  endef
50
51  $$(eval $$(call Require,$(1),$(2)))
52endef
53
54define RequireHeader
55  define Require/$(1)
56    [ -e "$(1)" ]
57  endef
58  
59  $$(eval $$(call Require,$(1),$(2)))
60endef
61
62.NOTPARALLEL:
63