Re: pkg-config zlib check in 3c13bc

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+From: Tomi Ollila <tomi.ollila@iki.fi>\r
+To: David Bremner <david@tethera.net>, =?utf-8?B?WMSrY8Oy?=\r
+       <xico@atelo.org>, notmuch@notmuchmail.org\r
+Subject: Re: pkg-config zlib check in 3c13bc\r
+In-Reply-To: <87lhucv5b8.fsf@maritornes.cs.unb.ca>\r
+References: <20140506194025.GA17097@coyotlan.Tlalpan>\r
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+Date: Fri, 09 May 2014 23:01:44 +0300\r
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+\r
+On Thu, May 08 2014, David Bremner <david@tethera.net> wrote:\r
+\r
+> Tomi Ollila <tomi.ollila@iki.fi> writes:\r
+>\r
+>>\r
+>> But, I'd like suggest alternate option to create a test c program\r
+>> and test whether it compiles (analogous to what there is already\r
+>> done with many other checks) -- this same would apply to fdatasync()\r
+>> case too.\r
+>>\r
+>\r
+> I agree in principle, but I'm not sure it's detectable at compile time,\r
+> since the option we need is passed as a string (boo!).  \r
+>\r
+> I guess the ZLIB_VERNUM hack would be preferable to adding platform\r
+> specific checks to configure. But note you'd need somehow to find\r
+> zlib.h.\r
+\r
+Actually my suggestion would be that if that pkg-config line for \r
+zlib does not work (btw why does it not work) try an option\r
+where zlib_cflags is expected to be empty and and zlib_ldflags -lz\r
+-- and try compile and run test program with those options\r
+then the test program is something like\r
+\r
+int main(void)\r
+{\r
+    return(ZLIB_VERNUM >= 0x1252);\r
+}\r
+\r
+(perhaps we could manage the same value in slightly different \r
+formats in 2 tests and remember to update those in sync ..\r
+or we could try:\r
+\r
+zv1=1 zv2=2 zv3=5 zv4=\r
+\r
+    if pkg-config --atleast-version=$zv1.$zv2.$zv3.$zv4 zlib; then\r
+\r
+and\r
+\r
+    return(ZLIB_VERNUM >= 0x$zv1$zv2$zv3$zv4);\r
+\r
+>\r
+> d\r
+\r
+\r
+Tomi\r