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makefile: Abort build if GREP_OPTIONS environment variable is defined

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This avoids the interference in this makefile's use of grep
as discussed in #492
This commit is contained in:
Mark Pizzolato 2017-11-27 05:31:32 -08:00
parent 00f8bbcef1
commit 63f55c785e
1 changed files with 13 additions and 0 deletions
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13
makefile
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@ -67,6 +67,19 @@
#
# CC Command (and platform available options). (Poor man's autoconf)
#
ifneq (,$(GREP_OPTIONS))
$(info GREP_OPTIONS is defined in your environment.)
$(info )
$(info This variable interfers with the proper operation of this script.)
$(info )
$(info The GREP_OPTIONS environment variable feature of grep is deprecated)
$(info for exactly this reason and will be removed from future versions of)
$(info grep. The grep man page suggests that you use an alias or a script)
$(info to invoke grep with your preferred options.)
$(info )
$(info unset the GREP_OPTIONS environment variable to use this makefile)
$(error 1)
endif
ifeq (old,$(shell gmake --version /dev/null 2>&1 | grep 'GNU Make' | awk '{ if ($$3 < "3.81") {print "old"} }'))
GMAKE_VERSION = $(shell gmake --version /dev/null 2>&1 | grep 'GNU Make' | awk '{ print $$3 }')
$(warning *** Warning *** GNU Make Version $(GMAKE_VERSION) is too old to)