86 lines
3.0 KiB
Plaintext
86 lines
3.0 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 header and library,
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# and if found:
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# - AC_DEFINE([HAVE_CAPSICUM]) is called.
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# - AC_DEFINE([HAVE_SYS_CAPSICUM_H]) is called if <sys/capsicum.h>
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# is present (otherwise <sys/capability.h> must be used).
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# - CAPSICUM_LIB is set to the -l option needed to link Capsicum support,
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# and AC_SUBST([CAPSICUM_LIB]) is called.
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# - The shell commands in ACTION-IF-FOUND are run. The default
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# ACTION-IF-FOUND prepends ${CAPSICUM_LIB} into LIBS. If you don't
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# want to modify LIBS and don't need to run any other commands either,
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# use a colon as ACTION-IF-FOUND.
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#
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# If Capsicum support isn't found:
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# - The shell commands in ACTION-IF-NOT-FOUND are run. The default
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# ACTION-IF-NOT-FOUND calls AC_MSG_WARN to print a warning that
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# Capsicum support wasn't found.
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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_SYS_CAPSICUM_H
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# # include <sys/capsicum.h>
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# # else
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# # include <sys/capability.h>
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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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# Copyright (c) 2015 Lasse Collin <lasse.collin@tukaani.org>
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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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#serial 2
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AC_DEFUN([AX_CHECK_CAPSICUM], [
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# On FreeBSD >= 11.x and Linux, Capsicum is uses <sys/capsicum.h>.
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# If this header is found, it is assumed to be the right one.
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capsicum_header_found=no
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AC_CHECK_HEADERS([sys/capsicum.h], [capsicum_header_found=yes])
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if test "$capsicum_header_found" = no ; then
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# On FreeBSD 10.x Capsicum uses <sys/capability.h>. Such a header exists
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# on Linux too but it describes POSIX.1e capabilities. Look for the
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# declaration of cap_rights_limit to check if <sys/capability.h> is
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# a Capsicum header.
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AC_CHECK_DECL([cap_rights_limit], [capsicum_header_found=yes], [],
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[#include <sys/capability.h>])
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fi
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capsicum_lib_found=no
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CAPSICUM_LIB=
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if test "$capsicum_header_found" = yes ; then
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AC_LANG_PUSH([C])
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# FreeBSD >= 10.x has Capsicum functions in libc.
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AC_LINK_IFELSE([AC_LANG_CALL([], [cap_rights_limit])],
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[capsicum_lib_found=yes], [])
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# Linux has Capsicum functions in libcaprights.
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AC_CHECK_LIB([caprights], [cap_rights_limit],
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[CAPSICUM_LIB=-lcaprights
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capsicum_lib_found=yes], [])
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AC_LANG_POP([C])
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fi
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AC_SUBST([CAPSICUM_LIB])
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if test "$capsicum_lib_found" = yes ; then
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AC_DEFINE([HAVE_CAPSICUM], [1], [Define to 1 if Capsicum is available.])
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m4_default([$1], [LIBS="${CAPSICUM_LIB} $LIBS"])
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else
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m4_default([$2], [AC_MSG_WARN([Capsicum support not found])])
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fi])
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