Re: [PATCH] vim: simplify build

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+From: Tomi Ollila <tomi.ollila@iki.fi>\r
+To: David Bremner <david@tethera.net>,\r
+       Felipe Contreras <felipe.contreras@gmail.com>\r
+Subject: Re: [PATCH] vim: simplify build\r
+In-Reply-To: <871unlgk7h.fsf@zancas.localnet>\r
+References: <1334751115-7216-1-git-send-email-felipe.contreras@gmail.com>\r
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+Date: Wed, 18 Apr 2012 18:40:42 +0300\r
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+\r
+On Wed, Apr 18 2012, David Bremner <david@tethera.net> wrote:\r
+\r
+> Felipe Contreras <felipe.contreras@gmail.com> writes:\r
+>>> If this is not an issue, then LGTM.\r
+>>\r
+>> I don't know, I have always used $(PWD), unless anybody else prefers\r
+>> $(CURDIR), I'll push that.\r
+>\r
+> I think CURDIR is better; if only because it is the standard (GNU) make\r
+> way of doing things [1].  I'm not sure if there is a functional\r
+> difference or not. At least CURDIR definitely works with make -C [2]\r
+\r
+I read some web pages and then did an experiment; GNU make (v 3.77+)\r
+has builtin variable $(CURDIR). $(PWD) gets value from environment:\r
+\r
+doing the following:\r
+\r
+$ cat > foo.mk <<EOF\r
+all:\r
+        pwd=`pwd`; echo $pwd\r
+        echo $(CURDIR)\r
+        echo $(PWD)\r
+EOF\r
+$ PWD= make -f foo.mk\r
+pwd=`pwd`; echo $pwd\r
+/home/too\r
+echo /home/too\r
+/home/too\r
+echo \r
+\r
+$ cd ..\r
+$ make -C too -f foo.mk\r
+make: Entering directory `/home/too'\r
+pwd=`pwd`; echo $pwd\r
+/home/too\r
+echo /home/too\r
+/home/too\r
+echo /home\r
+/home\r
+make: Leaving directory `/home/too'\r
+\r
+\r
+So, most portable option would be using pwd=`pwd`; echo $pwd\r
+construct in the makefile. Next option would be using $(CURDIR)\r
+and it works with -C (and with original bourne shell which does\r
+not manage $PWD). That is GNU make (v 3.77+) spesific but the makefiles\r
+use GNU make constructs elsewhere too.\r
+\r
+> d\r
+\r
+Tomi\r
+\r
+>\r
+>\r
+> [1]: http://www.gnu.org/software/make/manual/make.html#Recursion\r
+> [2]: http://www.gnu.org/software/make/manual/make.html#Options-Summary\r
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