1#!/usr/bin/m4 2# 3# Copyright (c) 2018 The strace developers. 4# All rights reserved. 5# 6# Redistribution and use in source and binary forms, with or without 7# modification, are permitted provided that the following conditions 8# are met: 9# 1. Redistributions of source code must retain the above copyright 10# notice, this list of conditions and the following disclaimer. 11# 2. Redistributions in binary form must reproduce the above copyright 12# notice, this list of conditions and the following disclaimer in the 13# documentation and/or other materials provided with the distribution. 14# 3. The name of the author may not be used to endorse or promote products 15# derived from this software without specific prior written permission. 16# 17# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28AC_DEFUN([st_ARG_LIBDW], [dnl 29 30: ${libdw_CPPFLAGS=} 31: ${libdw_CFLAGS=} 32: ${libdw_LDFLAGS=} 33: ${libdw_LIBS=} 34 35AC_ARG_WITH([libdw], 36 [AS_HELP_STRING([--with-libdw], 37 [use libdw to implement stack tracing support] 38 ) 39 ], 40 [case "${withval}" in 41 yes|no|check) ;; 42 *) libdw_CPPFLAGS="-I${withval}/include" 43 libdw_LDFLAGS="-L${withval}/lib" 44 with_libdw=yes ;; 45 esac 46 ], 47 [with_libdw=check] 48 ) 49 50]) 51 52AC_DEFUN([st_LIBDW], [dnl 53 54have_libdw= 55 56AS_IF([test "x$with_libdw" != xno && test "x$use_unwinder" = x], 57 [saved_CPPFLAGS="$CPPFLAGS" 58 saved_CFLAGS="$CFLAGS" 59 CPPFLAGS="$CPPFLAGS $libdw_CPPFLAGS" 60 CFLAGS="$CFLAGS $libdw_CFLAGS" 61 62 AC_CHECK_HEADERS([elfutils/libdwfl.h], 63 [AC_CHECK_LIB([dw], [dwfl_linux_proc_attach], 64 [libdw_LIBS="-ldw $libdw_LIBS" 65 AC_CACHE_CHECK([for elfutils version], 66 [st_cv_ELFUTILS_VERSION], 67 [[st_cv_ELFUTILS_VERSION="$(echo _ELFUTILS_VERSION | 68 $CPP $CPPFLAGS -P -imacros elfutils/version.h - | 69 grep '^[0-9]')" 70 test -n "$st_cv_ELFUTILS_VERSION" || 71 st_cv_ELFUTILS_VERSION=0 72 ]] 73 ) 74 AS_IF([test "$st_cv_ELFUTILS_VERSION" -ge 164], 75 [have_libdw=yes], 76 [AS_IF([test "x$with_libdw" = xyes], 77 [AC_MSG_ERROR([elfutils version >= 164 is required for stack tracing support])], 78 [AC_MSG_WARN([elfutils version >= 164 is required for stack tracing support])] 79 ) 80 ] 81 ) 82 ], 83 [AS_IF([test "x$with_libdw" = xyes], 84 [AC_MSG_FAILURE([failed to find dwfl_linux_proc_attach in libdw])], 85 ) 86 ], 87 [$libdw_LDFLAGS $libdw_LIBS] 88 ) 89 ], 90 [AS_IF([test "x$with_libdw" = xyes], 91 [AC_MSG_FAILURE([failed to find elfutils/libdwfl.h])] 92 ) 93 ] 94 ) 95 96 CFLAGS="$saved_CFLAGS" 97 CPPFLAGS="$saved_CPPFLAGS" 98 ] 99) 100 101AS_IF([test "x$have_libdw" = xyes], 102 [use_unwinder=libdw 103 AC_DEFINE([USE_LIBDW], 1, 104 [Whether to use libdw for stack tracing] 105 ) 106 AC_SUBST(libdw_CPPFLAGS) 107 AC_SUBST(libdw_CFLAGS) 108 AC_SUBST(libdw_LDFLAGS) 109 AC_SUBST(libdw_LIBS) 110 ] 111 ) 112 113]) 114