samba-mirror/lib/util/charset/config.m4

dnl SMB_CHECK_ICONV(hdr, msg, action-if-found,action-if-not-found)
AC_DEFUN(SMB_CHECK_ICONV,[
  AC_MSG_CHECKING($2)
  AC_TRY_RUN([#include <stdlib.h>
#include <$1>

int main()
{
   iconv_t cd = iconv_open("ASCII","UCS-2LE");
   if (cd == 0 || cd == (iconv_t)-1) return -1;
   return 0;
} 
   ],
   [AC_MSG_RESULT(yes); $3],
   [AC_MSG_RESULT(no); $4],
   [AC_MSG_RESULT(cross); $4])
])

dnl SMB_CHECK_ICONV_DIR(dir,action-if-found,action-if-not-found)
AC_DEFUN(SMB_CHECK_ICONV_DIR,
[
	save_CPPFLAGS="$CPPFLAGS"
	save_LDFLAGS="$LDFLAGS"
	save_LIBS="$LIBS"
	CPPFLAGS="-I$1/include"
	LDFLAGS="-L$1/lib"
	LIBS=-liconv

	SMB_CHECK_ICONV(iconv.h,Whether iconv.h is present,[ AC_DEFINE(HAVE_ICONV_H,1,[Whether iconv.h is present]) $2 ], [
        LIBS=-lgiconv
        SMB_CHECK_ICONV(giconv.h,Whether giconv.h is present, [AC_DEFINE(HAVE_GICONV_H,1,[Whether giconv.h is present]) $2],[$3])
	])

	CPPFLAGS="$save_CPPFLAGS"
	LDFLAGS="$save_LDFLAGS"
	LIBS="$save_LIBS"
])

ICONV_FOUND=no
LOOK_DIRS="/usr /usr/local /sw"
AC_ARG_WITH(libiconv,
[  --with-libiconv=BASEDIR Use libiconv in BASEDIR/lib and BASEDIR/include (default=auto) ],
[
  if test "$withval" = "no" ; then
    AC_MSG_ERROR(I won't take no for an answer)
  else
     if test "$withval" != "yes" ; then
	SMB_CHECK_ICONV_DIR($withval, [
		ICONV_FOUND=yes; 
		ICONV_CPPFLAGS="$CPPFLAGS"
		ICONV_LIBS="$LIBS"
		ICONV_LDFLAGS="$LDFLAGS"
		], [AC_MSG_ERROR([No iconv library found in $withval])])
     fi
  fi
])

if test x$ICONV_FOUND = xno; then
	SMB_CHECK_ICONV(iconv.h,
		[Whether iconv.h is present], 
		[AC_DEFINE(HAVE_ICONV_H,1,[Whether iconv.h is present]) ICONV_FOUND=yes])
fi

for i in $LOOK_DIRS ; do
	if test x$ICONV_FOUND = xyes; then
		break
	fi
	
	SMB_CHECK_ICONV_DIR($i, [
		ICONV_FOUND=yes
		ICONV_CPPFLAGS="$CPPFLAGS"
		ICONV_LIBS="$LIBS"
		ICONV_LDFLAGS="$LDFLAGS"
		], [])
done

if test x"$ICONV_FOUND" = x"no"; then 
    AC_MSG_WARN([Sufficient support for iconv function was not found. 
    Install libiconv from http://www.gnu.org/software/libiconv/ for better charset compatibility!])
	SMB_ENABLE(ICONV,NO)
else
	AC_DEFINE(HAVE_NATIVE_ICONV,1,[Whether external iconv is available])
	SMB_ENABLE(ICONV,YES)
fi

SMB_EXT_LIB(ICONV,[${ICONV_LIBS}],[${ICONV_CFLAGS}],[${ICONV_CPPFLAGS}],[${ICONV_LDFLAGS}])