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25
26###
27### This file is just a very small wrapper needed to run the real make/Init.gmk.
28### It also performs some sanity checks on make.
29###
30
31# The shell code below will be executed on /usr/bin/make on Solaris, but not in GNU Make.
32# /usr/bin/make lacks basically every other flow control mechanism.
33.TEST_FOR_NON_GNUMAKE:sh=echo You are not using GNU Make/gmake, this is a requirement. Check your path. 1>&2 && exit 1
34
35# The .FEATURES variable is likely to be unique for GNU Make.
36ifeq ($(.FEATURES), )
37  $(info Error: '$(MAKE)' does not seem to be GNU Make, which is a requirement.)
38  $(info Check your path, or upgrade to GNU Make 3.81 or newer.)
39  $(error Cannot continue)
40endif
41
42# Assume we have GNU Make, but check version.
43ifeq ($(strip $(foreach v, 3.81% 3.82% 4.%, $(filter $v, $(MAKE_VERSION)))), )
44  $(info Error: This version of GNU Make is too low ($(MAKE_VERSION)).)
45  $(info Check your path, or upgrade to GNU Make 3.81 or newer.)
46  $(error Cannot continue)
47endif
48
49# In Cygwin, the MAKE variable gets prepended with the current directory if the
50# make executable is called using a Windows mixed path (c:/cygwin/bin/make.exe).
51ifneq ($(findstring :, $(MAKE)), )
52  MAKE := $(patsubst $(CURDIR)%, %, $(patsubst $(CURDIR)/%, %, $(MAKE)))
53endif
54
55# Locate this Makefile
56ifeq ($(filter /%, $(lastword $(MAKEFILE_LIST))),)
57  makefile_path := $(CURDIR)/$(strip $(lastword $(MAKEFILE_LIST)))
58else
59  makefile_path := $(lastword $(MAKEFILE_LIST))
60endif
61topdir := $(strip $(patsubst %/, %, $(dir $(makefile_path))))
62
63# ... and then we can include the real makefile
64include $(topdir)/make/Init.gmk
65