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ac 2.68 - AC_LANG_SOURCE

From: Jan Engelhardt
Subject: ac 2.68 - AC_LANG_SOURCE
Date: Sat, 2 Apr 2011 20:25:49 +0200 (CEST)
User-agent: Alpine 2.01 (LNX 1266 2009-07-14)

I have seen the thread at already, 
though there is a case where the warning persists: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call 
detected in body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2662: _AC_LINK_IFELSE is expanded from...
../../lib/autoconf/general.m4:2679: AC_LINK_IFELSE is expanded from... the top level

AC_LINK_IFELSE(AC_LANG_SOURCE([int main(void) { return 0; }]))

Adding [ ] around AC_LANG_SOURCE would fix it, but I don't see this 
extra quoting being normally required. Can someone elaborate?

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