Don't use lseek when truncating a file to avoid corrupting the current
[wine/multimedia.git] / aclocal.m4
blob76813bd9be689c8261083b928cf17494847d8aed
1 dnl Macros used to build the Wine configure script
2 dnl
3 dnl Copyright 2002 Alexandre Julliard
4 dnl
5 dnl This library is free software; you can redistribute it and/or
6 dnl modify it under the terms of the GNU Lesser General Public
7 dnl License as published by the Free Software Foundation; either
8 dnl version 2.1 of the License, or (at your option) any later version.
9 dnl
10 dnl This library is distributed in the hope that it will be useful,
11 dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
12 dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13 dnl Lesser General Public License for more details.
14 dnl
15 dnl You should have received a copy of the GNU Lesser General Public
16 dnl License along with this library; if not, write to the Free Software
17 dnl Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18 dnl
19 dnl As a special exception to the GNU Lesser General Public License,
20 dnl if you distribute this file as part of a program that contains a
21 dnl configuration script generated by Autoconf, you may include it
22 dnl under the same distribution terms that you use for the rest of
23 dnl that program.
25 dnl **** Get the ldd program name; used by WINE_GET_SONAME ****
26 dnl
27 dnl Usage: WINE_PATH_LDD
28 dnl
29 AC_DEFUN([WINE_PATH_LDD],[AC_PATH_PROG(LDD,ldd,true,/sbin:/usr/sbin:$PATH)])
31 dnl **** Extract the soname of a library ****
32 dnl
33 dnl Usage: WINE_GET_SONAME(LIBRARY, FUNCTION, [OTHER_LIBRARIES])
34 dnl
35 AC_DEFUN([WINE_GET_SONAME],
36 [AC_REQUIRE([WINE_PATH_LDD])
37 AC_CACHE_CHECK([for -l$1 soname], ac_cv_lib_soname_$1,
38 [ac_get_soname_save_LIBS=$LIBS
39 LIBS="-l$1 $3 $LIBS"
40   AC_LINK_IFELSE([AC_LANG_CALL([], [$2])],
41   [ac_cv_lib_soname_$1=`$ac_cv_path_LDD conftest$ac_exeext | grep lib$1\\.$LIBEXT | sed "s/^.*\(lib$1\.$LIBEXT[[^        ]]*\).*$/\1/"`
42   if test "x$ac_cv_lib_soname_$1" = "x"
43   then
44      ac_cv_lib_soname_$1="lib$1.$LIBEXT"
45   fi],
46   [ac_cv_lib_soname_$1="lib$1.$LIBEXT"])
47   LIBS=$ac_get_soname_save_LIBS])
48 if test "x$ac_cv_lib_soname_$1" != xNONE
49 then AC_DEFINE_UNQUOTED(AS_TR_CPP(SONAME_LIB$1),"$ac_cv_lib_soname_$1",
50                         [Define to the soname of the lib$1 library.])dnl
51 fi])
53 dnl **** Link C code with an assembly file ****
54 dnl
55 dnl Usage: WINE_TRY_ASM_LINK(asm-code,includes,function,[action-if-found,[action-if-not-found]])
56 dnl
57 AC_DEFUN([WINE_TRY_ASM_LINK],
58 [AC_TRY_LINK([void ac_asm(void) { asm([$1]); }
59 [$2]],[$3],[$4],[$5])])
61 dnl **** Check if we can link an empty program with special CFLAGS ****
62 dnl
63 dnl Usage: WINE_TRY_CFLAGS(flags,[action-if-yes,[action-if-no]])
64 dnl
65 AC_DEFUN([WINE_TRY_CFLAGS],
66 [ac_wine_try_cflags_saved=$CFLAGS
67 CFLAGS="$CFLAGS $1"
68 AC_TRY_LINK([],[],[$2],[$3])
69 CFLAGS=$ac_wine_try_cflags_saved])
71 dnl **** Check whether we need to define a symbol on the compiler command line ****
72 dnl
73 dnl Usage: WINE_CHECK_DEFINE(name),[action-if-yes,[action-if-no]])
74 dnl
75 AC_DEFUN([WINE_CHECK_DEFINE],
76 [AS_VAR_PUSHDEF([ac_var],[ac_cv_cpp_def_$1])dnl
77 AC_CACHE_CHECK([whether we need to define $1],ac_var,
78     AC_EGREP_CPP(yes,[#ifndef $1
79 yes
80 #endif],
81     [AS_VAR_SET(ac_var,yes)],[AS_VAR_SET(ac_var,no)]))
82 AS_IF([test AS_VAR_GET(ac_var) = yes],
83       [CFLAGS="$CFLAGS -D$1"
84   LINTFLAGS="$LINTFLAGS -D$1"])dnl
85 AS_VAR_POPDEF([ac_var])])
87 dnl **** Check for ln ****
88 dnl
89 dnl Usage: WINE_PROG_LN
90 dnl
91 AC_DEFUN([WINE_PROG_LN],
92 [AC_MSG_CHECKING([whether ln works])
93 rm -f conf$$ conf$$.file
94 echo >conf$$.file
95 if ln conf$$.file conf$$ 2>/dev/null; then
96   AC_SUBST(LN,ln)
97   AC_MSG_RESULT([yes])
98 else
99   AC_SUBST(LN,["cp -p"])
100   AC_MSG_RESULT([no, using $LN])
102 rm -f conf$$ conf$$.file])
104 dnl **** Create non-existent directories from config.status ****
106 dnl Usage: WINE_CONFIG_EXTRA_DIR(dirname)
108 AC_DEFUN([WINE_CONFIG_EXTRA_DIR],
109 [AC_CONFIG_COMMANDS([$1],[test -d "$1" || (AC_MSG_NOTICE([creating $1]) && mkdir "$1")])])