Re: can't find ceil function in math library

[Minxuan Zhuang]

I've changed AC_CHECK_LIB([m], [ceil]) to AC_CHECK_LIB([m], [main]) and it works. according to conftest.c, libtool generate a small peace of code to check whether the specific function exists or not. for AC_CHECK_LIB([m], [main]), the code is:

main()

{

    return main();

    ;

    return 0;

}

call main itself in gcc will cause a crash, why it can works here?

On Thu, Jul 3, 2014 at 2:46 PM, Minxuan Zhuang <address@hidden> wrote:

hi：

I have a configure.ac file includes:  AC_CHECK_LIB([m], [ceil]) 

then I got this result: checking for ceil in -lm... no

but a .c file contains ceil function works very well  with or without -lm, why is that?

libtool version: 2.4.2

system： Ubuntu 13.04