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

# don't let the AC_PROG_CC macro auto set the CFLAGS
OLD_CFLAGS="${CFLAGS}"
AC_PROG_CC
CFLAGS="${OLD_CFLAGS}"
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

#
# Set the debug symbol option if we have
# --enable-*developer or --enable-debug
# and the compiler supports it
#
if test x$ac_cv_prog_cc_g = xyes -a x$debug = xyes; then
	CFLAGS="${CFLAGS} -g"
fi

dnl needed before AC_TRY_COMPILE
AC_ISC_POSIX

AC_C_INLINE

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
		precompiled_headers=yes
	else
		precompiled_headers=no
	fi])
AC_SUBST(precompiled_headers)


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_SUBST(samba_cv_immediate_structures)

############################################
# check if the compiler handles c99 struct initialization
SMB_CC_SUPPORTS_C99_STRUCT_INIT(samba_cv_c99_struct_initialization=yes,
		    samba_cv_c99_struct_initialization=no)

if test x"$samba_cv_c99_struct_initialization" != x"yes"; then
	# We might need to add some flags to CC to get c99 behaviour.
	AX_CFLAGS_IRIX_OPTION(-c99, CFLAGS)
	SMB_CC_SUPPORTS_C99_STRUCT_INIT(samba_cv_c99_struct_initialization=yes,
			    samba_cv_c99_struct_initialization=no)
fi

if test x"$samba_cv_c99_struct_initialization" != x"yes"; then
	AC_MSG_WARN([C compiler does not support c99 struct initialization!])
	AC_MSG_ERROR([Please Install gcc from http://gcc.gnu.org/])
fi

############################################
# check if the compiler can handle negative enum values
# and don't truncate the values to INT_MAX
# a runtime test is needed here
AC_CACHE_CHECK([that the C compiler understands negative enum values],SMB_BUILD_CC_NEGATIVE_ENUM_VALUES, [
    AC_TRY_RUN(
[
	#include <stdio.h>
	enum negative_values { NEGATIVE_VALUE = 0xFFFFFFFF };
	int main(void) {
		enum negative_values v1 = NEGATIVE_VALUE;
		unsigned v2 = NEGATIVE_VALUE;

		if (v1 != 0xFFFFFFFF) {
			printf("%u != 0xFFFFFFFF\n", v1);
			return 1;
		}
		if (v2 != 0xFFFFFFFF) {
			printf("%u != 0xFFFFFFFF\n", v2);
			return 1;
		}

		return 0;
	}
],
	SMB_BUILD_CC_NEGATIVE_ENUM_VALUES=yes,SMB_BUILD_CC_NEGATIVE_ENUM_VALUES=no)])
if test x"$SMB_BUILD_CC_NEGATIVE_ENUM_VALUES" != x"yes"; then
	AC_MSG_WARN([using --unit-enums for pidl])
	PIDL_ARGS="$PIDL_ARGS --uint-enums"
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 support ELF visibility for symbols
#

visibility_attribute=no
VISIBILITY_CFLAGS=""
if test x"$GCC" = x"yes" ; then
	AX_CFLAGS_GCC_OPTION([-fvisibility=hidden], VISIBILITY_CFLAGS)
fi

if test -n "$VISIBILITY_CFLAGS"; then
	AC_MSG_CHECKING([whether the C compiler supports the visibility attribute])
	OLD_CFLAGS="$CFLAGS"

	CFLAGS="$CFLAGS $VISIBILITY_CFLAGS"
	AC_TRY_RUN([
		void vis_foo1(void) {}
		__attribute__((visibility("default"))) void vis_foo2(void) {}
		#include "${srcdir-.}/build/tests/trivial.c"
	],[
		AC_MSG_RESULT(yes)
		AC_DEFINE(HAVE_VISIBILITY_ATTR,1,[Whether the C compiler supports the visibility attribute])
		visibility_attribute=yes
	],[
		AC_MSG_RESULT(no)
	])
	CFLAGS="$OLD_CFLAGS"
fi
AC_SUBST(visibility_attribute)

#
# Check if the compiler can handle the options we selected by
# --enable-*developer
#
DEVELOPER_CFLAGS=""
if test x$developer = xyes; then
    	OLD_CFLAGS="${CFLAGS}"

	CFLAGS="${CFLAGS} -D_SAMBA_DEVELOPER_DONNOT_USE_O2_"
	DEVELOPER_CFLAGS="-DDEBUG_PASSWORD -DDEVELOPER"
	if test x"$GCC" = x"yes" ; then
	    AX_CFLAGS_GCC_OPTION(-Wall, DEVELOPER_CFLAGS)
	    AX_CFLAGS_GCC_OPTION(-Wshadow, DEVELOPER_CFLAGS)
	    AX_CFLAGS_GCC_OPTION(-Werror-implicit-function-declaration, DEVELOPER_CFLAGS)
	    AX_CFLAGS_GCC_OPTION(-Wstrict-prototypes, DEVELOPER_CFLAGS)
	    AX_CFLAGS_GCC_OPTION(-Wpointer-arith, DEVELOPER_CFLAGS)
	    AX_CFLAGS_GCC_OPTION(-Wcast-qual, DEVELOPER_CFLAGS)
	    AX_CFLAGS_GCC_OPTION(-Wcast-align, DEVELOPER_CFLAGS)
	    AX_CFLAGS_GCC_OPTION(-Wwrite-strings, DEVELOPER_CFLAGS)
	    AX_CFLAGS_GCC_OPTION(-Wmissing-format-attribute, DEVELOPER_CFLAGS)
	    AX_CFLAGS_GCC_OPTION(-Wformat=2, DEVELOPER_CFLAGS)
	    AX_CFLAGS_GCC_OPTION(-Wno-format-y2k, DEVELOPER_CFLAGS)
	    AX_CFLAGS_GCC_OPTION(-Wno-declaration-after-statement, DEVELOPER_CFLAGS)
	else
	    AX_CFLAGS_IRIX_OPTION(-fullwarn, DEVELOPER_CFLAGS)
	fi

    	CFLAGS="${OLD_CFLAGS}"
fi
if test -n "$DEVELOPER_CFLAGS"; then
	OLD_CFLAGS="${CFLAGS}"
	CFLAGS="${CFLAGS} ${DEVELOPER_CFLAGS}"
	AC_MSG_CHECKING([that the C compiler can use the DEVELOPER_CFLAGS])
	AC_TRY_COMPILE([],[],
		AC_MSG_RESULT(yes),
		DEVELOPER_CFLAGS=""; AC_MSG_RESULT(no))
	CFLAGS="${OLD_CFLAGS}"
fi

# allow for --with-hostcc=gcc
AC_ARG_WITH(hostcc,[  --with-hostcc=compiler    choose host compiler],
[HOSTCC=$withval],
[
if test z"$cross_compiling" = "yes"; then 
	HOSTCC=cc
else 
	HOSTCC=$CC
fi
])
AC_SUBST(HOSTCC)

AC_PATH_PROG(GCOV,gcov)

AC_PATH_PROG(MAKE,make)

AC_CACHE_CHECK([whether we have GNU make], samba_cv_gnu_make, [
if $ac_cv_path_MAKE --version | head -1 | grep GNU 2>/dev/null >/dev/null
then
	samba_cv_gnu_make=yes
else
	samba_cv_gnu_make=no
fi
])

GNU_MAKE=$samba_cv_gnu_make
AC_SUBST(GNU_MAKE)

if test "x$GNU_MAKE" = x"yes"; then
	AC_CACHE_CHECK([GNU make version], samba_cv_gnu_make_version,[
		samba_cv_gnu_make_version=`$ac_cv_path_MAKE --version | head -1 | cut -d " " -f 3 2>/dev/null`
	])
	GNU_MAKE_VERSION=$samba_cv_gnu_make_version
	AC_SUBST(GNU_MAKE_VERSION)
fi


new_make=no
AC_MSG_CHECKING([for GNU make >= 3.81])
if test x$GNU_MAKE = x"yes"; then
	if $PERL -e " \$_ = '$GNU_MAKE_VERSION'; s/@<:@^\d\.@:>@.*//g; exit (\$_ < 3.81);"; then
		new_make=yes
	fi
fi
AC_MSG_RESULT($new_make)
automatic_dependencies=no
AX_CFLAGS_GCC_OPTION([-M -MT conftest.d -MF conftest.o], [], [ automatic_dependencies=$new_make ], [])
AC_MSG_CHECKING([Whether to use automatic dependencies])
AC_MSG_RESULT($automatic_dependencies)
AC_SUBST(automatic_dependencies)