mirror of https://git.tukaani.org/xz.git
87 lines
3.1 KiB
Plaintext
87 lines
3.1 KiB
Plaintext
# -*- Autoconf -*-
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# SYNOPSIS
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#
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# AX_CHECK_CAPSICUM([action-if-found[, action-if-not-found]])
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#
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# DESCRIPTION
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#
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# This macro searches for an installed Capsicum library, and if found:
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# - calls one of AC_DEFINE([HAVE_CAPSICUM_SYS_CAPSICUM_H]) or
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# AC_DEFINE([HAVE_CAPSICUM_SYS_CAPABILITY_H])
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# - sets CAPSICUM_LIB to the -l option needed to link Capsicum support.
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#
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# If either the header file or the library is not found,
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# shell commands 'action-if-not-found' is run.
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#
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# If both header file and library are found, shell commands
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# 'action-if-found' is run. If 'action-if-found' is not specified, the
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# default action:
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# - calls AC_DEFINE(HAVE_CAPSICUM)
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# - prepends ${CAPSICUM_LIB} to LIBS.
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#
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# You should use autoheader to include a definition for the symbols above
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# in a config.h file.
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#
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# Sample usage in a C/C++ source is as follows:
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#
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# #ifdef HAVE_CAPSICUM
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# # ifdef HAVE_CAPSICUM_SYS_CAPSICUM_H
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# # include <sys/capsicum.h>
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# # else
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# # ifdef HAVE_CAPSICUM_SYS_CAPABILITY_H
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# # include <sys/capability.h>
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# # endif
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# # endif
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# #endif /* HAVE_CAPSICUM */
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#
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# LICENSE
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#
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# Copyright (c) 2014 Google Inc.
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#
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# Copying and distribution of this file, with or without modification,
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# are permitted in any medium without royalty provided the copyright
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# notice and this notice are preserved. This file is offered as-is,
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# without any warranty.
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AU_ALIAS([CHECK_CAPSICUM], [AX_CHECK_CAPSICUM])
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AC_DEFUN([AX_CHECK_CAPSICUM],
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[AC_CHECK_HEADERS([sys/capability.h sys/capsicum.h])
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capsicum_hdrfound=false
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# If <sys/capsicum.h> exists (Linux, FreeBSD>=11.x), assume it is the correct header.
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if test "x$ac_cv_header_sys_capsicum_h" = "xyes" ; then
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AC_DEFINE([HAVE_CAPSICUM_SYS_CAPSICUM_H],[],[Capsicum functions declared in <sys/capsicum.h>])
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capsicum_hdrfound=true
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elif test "x$ac_cv_header_sys_capability_h" = "xyes" ; then
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# Just <sys/capability.h>; on FreeBSD 10.x this covers Capsicum, but on Linux it
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# describes POSIX.1e capabilities. So check it declares cap_rights_limit.
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AC_CHECK_DECL([cap_rights_limit],
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[AC_DEFINE([HAVE_CAPSICUM_SYS_CAPABILITY_H],[],[Capsicum functions declared in <sys/capability.h>])
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capsicum_hdrfound=true],[],
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[#include <sys/capability.h>])
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fi
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AC_LANG_PUSH([C])
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# FreeBSD >= 10.x has Capsicum functions in libc
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capsicum_libfound=false
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AC_LINK_IFELSE([AC_LANG_CALL([], [cap_rights_limit])],
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[capsicum_libfound=true],[])
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# Linux has Capsicum functions in libcaprights
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AC_CHECK_LIB([caprights],[cap_rights_limit],
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[AC_SUBST([CAPSICUM_LIB],[-lcaprights])
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capsicum_libfound=true],[])
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AC_LANG_POP([C])
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if test "$capsicum_hdrfound" = "true" && test "$capsicum_libfound" = "true"
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then
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# If both library and header were found, action-if-found
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m4_ifblank([$1],[
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LIBS="${CAPSICUM_LIB} $LIBS"
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AC_DEFINE([HAVE_CAPSICUM],[],[Capsicum library available])])
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else
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# If either header or library was not found, action-if-not-found
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m4_default([$2],[AC_MSG_WARN([Capsicum support not found])])
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fi])
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