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|
#!/usr/bin/m4
#
# Copyright (c) 2018 The strace developers.
# All rights reserved.
#
# SPDX-License-Identifier: LGPL-2.1-or-later
AC_DEFUN([st_ARG_LIBDW], [dnl
: ${libdw_CPPFLAGS=}
: ${libdw_CFLAGS=}
: ${libdw_LDFLAGS=}
: ${libdw_LIBS=}
AC_ARG_WITH([libdw],
[AS_HELP_STRING([--with-libdw],
[use libdw to implement stack tracing support]
)
],
[case "${withval}" in
yes|no|check) ;;
*) libdw_CPPFLAGS="-I${withval}/include"
libdw_LDFLAGS="-L${withval}/lib"
with_libdw=yes ;;
esac
],
[with_libdw=check]
)
])
AC_DEFUN([st_LIBDW], [dnl
have_libdw=
AS_IF([test "x$with_libdw" != xno && test "x$use_unwinder" = x],
[saved_CPPFLAGS="$CPPFLAGS"
saved_CFLAGS="$CFLAGS"
CPPFLAGS="$CPPFLAGS $libdw_CPPFLAGS"
CFLAGS="$CFLAGS $libdw_CFLAGS"
AC_CHECK_HEADERS([elfutils/libdwfl.h],
[AC_CHECK_LIB([dw], [dwfl_linux_proc_attach],
[libdw_LIBS="-ldw $libdw_LIBS"
AC_CACHE_CHECK([for elfutils version],
[st_cv_ELFUTILS_VERSION],
[[st_cv_ELFUTILS_VERSION="$(echo _ELFUTILS_VERSION |
$CPP $CPPFLAGS -P -imacros elfutils/version.h - |
grep '^[0-9]')"
test -n "$st_cv_ELFUTILS_VERSION" ||
st_cv_ELFUTILS_VERSION=0
]]
)
AS_IF([test "$st_cv_ELFUTILS_VERSION" -ge 164],
[have_libdw=yes],
[AS_IF([test "x$with_libdw" = xyes],
[AC_MSG_ERROR([elfutils version >= 164 is required for stack tracing support])],
[AC_MSG_WARN([elfutils version >= 164 is required for stack tracing support])]
)
]
)
],
[AS_IF([test "x$with_libdw" = xyes],
[AC_MSG_FAILURE([failed to find dwfl_linux_proc_attach in libdw])],
)
],
[$libdw_LDFLAGS $libdw_LIBS]
)
],
[AS_IF([test "x$with_libdw" = xyes],
[AC_MSG_FAILURE([failed to find elfutils/libdwfl.h])]
)
]
)
CFLAGS="$saved_CFLAGS"
CPPFLAGS="$saved_CPPFLAGS"
]
)
AS_IF([test "x$have_libdw" = xyes],
[use_unwinder=libdw
AC_DEFINE([USE_LIBDW], 1,
[Whether to use libdw for stack tracing]
)
AC_SUBST(libdw_CPPFLAGS)
AC_SUBST(libdw_CFLAGS)
AC_SUBST(libdw_LDFLAGS)
AC_SUBST(libdw_LIBS)
]
)
])
|
