dnl SMB Build Environment CC Checks
dnl -------------------------------------------------------
dnl  Copyright (C) Stefan (metze) Metzmacher 2004
dnl  Released under the GNU GPL
dnl -------------------------------------------------------
dnl

AC_PROG_CC
if test x"$CC" = x""; then
	AC_MSG_WARN([No c compiler was not found!])
	AC_MSG_ERROR([Please Install gcc from http://gcc.gnu.org/])
fi

# compile with optimization and without debugging by default, but
# allow people to set their own preference.
if test "x$CFLAGS" = x; then
	CFLAGS="-O ${CFLAGS}"
fi

dnl needed before AC_TRY_COMPILE
AC_ISC_POSIX

dnl Check if C compiler understands -c and -o at the same time
AC_PROG_CC_C_O
if eval "test \"`echo '$ac_cv_prog_cc_'${ac_cc}_c_o`\" = no"; then
	BROKEN_CC=
else
	BROKEN_CC=#
fi
AC_SUBST(BROKEN_CC)

AC_CACHE_CHECK([that the C compiler can precompile header files],samba_cv_precompiled_headers, [
	dnl Check whether the compiler can generate precompiled headers
	touch conftest.h
	if ${CC-cc} conftest.h 2> /dev/null && test -f conftest.h.gch; then
		samba_cv_precompiled_headers=yes
	else
		samba_cv_precompiled_headers=no
	fi])
PCH_AVAILABLE="#"
if test x"$samba_cv_precompiled_headers" = x"yes"; then
	PCH_AVAILABLE=""
fi
AC_SUBST(PCH_AVAILABLE)


dnl Check if the C compiler understands volatile (it should, being ANSI).
AC_CACHE_CHECK([that the C compiler understands volatile],samba_cv_volatile, [
	AC_TRY_COMPILE([#include <sys/types.h>],[volatile int i = 0],
		samba_cv_volatile=yes,samba_cv_volatile=no)])
if test x"$samba_cv_volatile" = x"yes"; then
	AC_DEFINE(HAVE_VOLATILE, 1, [Whether the C compiler understands volatile])
fi

############################################
# check if the compiler can do immediate structures
AC_CACHE_CHECK([for immediate structures],samba_cv_immediate_structures, [
    AC_TRY_COMPILE([
#include <stdio.h>],
[
   typedef struct {unsigned x;} FOOBAR;
   #define X_FOOBAR(x) ((FOOBAR) { x })
   #define FOO_ONE X_FOOBAR(1)
   FOOBAR f = FOO_ONE;   
   static struct {
	FOOBAR y; 
	} f2[] = {
		{FOO_ONE}
	};   
],
	samba_cv_immediate_structures=yes,samba_cv_immediate_structures=no)])
if test x"$samba_cv_immediate_structures" = x"yes"; then
   AC_DEFINE(HAVE_IMMEDIATE_STRUCTURES,1,[Whether the compiler supports immediate structures])
fi

AC_MSG_CHECKING([for test routines])
AC_TRY_RUN([#include "${srcdir-.}/build/tests/trivial.c"],
	    AC_MSG_RESULT(yes),
	    AC_MSG_ERROR([cant find test code. Aborting config]),
	    AC_MSG_WARN([cannot run when cross-compiling]))

#
# Check if the compiler can handle the options we selected by
# --enable-*developer and --enable-debug
#
if test -n "$DEVELOPER_CFLAGS"; then
	OLD_CFLAGS="${CFLAGS}"
	CFLAGS="${CFLAGS} ${DEVELOPER_CFLAGS}"
	AC_MSG_CHECKING([that the C compiler can use the DEVELOPER_CFLAGS])
	AC_TRY_RUN([#include "${srcdir-.}/build/tests/trivial.c"],
		AC_MSG_RESULT(yes),
		DEVELOPER_CFLAGS=""; AC_MSG_RESULT(no),
		AC_MSG_WARN([cannot run when cross-compiling]))
	CFLAGS="${OLD_CFLAGS}"
fi