Behaviour differs at configure time

[Andre Caldas]

Hello, All!

I have these lines in my configure.ac:

AC_CHECK_LIB( pthread, [pthread_create] )
AC_CHECK_HEADERS( pthread.h, [ AC_DEFINE(THREAD_SAFE, 1,
        [We will use posix threads]) ] )
AC_CHECK_FUNCS( pthread_yield pthread_mutexattr_settype )


I am cross-compiling (--host=arm-linux).

When I run the configure script it checks for 
pthread_mutexattr_settype and finds it. But when I do a "make", I get 
an error saying that this function is not defined.

Well, the function is protected by a "#ifdef __USE_UNIX98". I guess 
this is the source of my problem. Why would that be defined during 
configure and not during make?

I don't have any environment vars set that would affect this, I 
belive. I did this:
        set | grep FLAG
and got nothing.

I run configure like this:
~/project/configure --prefix=~/usr --disable-static 'CXXFLAGS=-O3 -g0 
-Wall -pedantic-errors -Wno-long-long -Woverloaded-virtual'

Thank you,
Andre Caldas.