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Autoconf protype breaks GCC builtin inlining

From: Ferenc Wágner
Subject: Autoconf protype breaks GCC builtin inlining
Date: Wed, 24 Jan 2018 22:36:36 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux)


Since ceil() can be inlined when optimization is enabled, I use

AC_SEARCH_LIBS([ceil], [m], , [AC_MSG_ERROR([ceil not found])])

to link against libm only when necessary (that is, when ceil is not
inlined).  However, it does not work because GCC says in config.log:

conftest.c:76:6: warning: conflicting types for built-in function 'ceil'
 char ceil ();

and inlining is disabled, thus ceil becomes an undefined reference
without -lm.  However, in the actual code where math.h is #included, the
above warning does not happen, ceil is inlined and I unnecessarily link
with -lm.  How could I overcome this?

Please Cc me, I'm not subscribed.

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