# =========================================================================== # https://www.gnu.org/software/autoconf-archive/ax_execinfo.html # =========================================================================== # # SYNOPSIS # # AX_EXECINFO([ACTION-IF-EXECINFO-H-IS-FOUND], [ACTION-IF-EXECINFO-H-IS-NOT-FOUND], [ADDITIONAL-TYPES-LIST]) # # DESCRIPTION # # Checks for execinfo.h header and if the len parameter/return type can be # found from a list, also define backtrace_size_t to that type. # # By default the list of types to try contains int and size_t, but should # some yet undiscovered system use e.g. unsigned, the 3rd argument can be # used for extensions. I'd like to hear of further suggestions. # # Executes ACTION-IF-EXECINFO-H-IS-FOUND when present and the execinfo.h # header is found or ACTION-IF-EXECINFO-H-IS-NOT-FOUND in case the header # seems unavailable. # # Also adds -lexecinfo to LIBS on BSD if needed. # # LICENSE # # Copyright (c) 2014 Thomas Jahns <jahns@dkrz.de> # # Copying and distribution of this file, with or without modification, are # permitted in any medium without royalty provided the copyright notice # and this notice are preserved. This file is offered as-is, without any # warranty.
#serial 2
AC_DEFUN([AX_EXECINFO],
[AC_CHECK_HEADERS([execinfo.h])
AS_IF([test x"$ac_cv_header_execinfo_h" = xyes],
[AC_CACHE_CHECK([size parameter type for backtrace()],
[ax_cv_proto_backtrace_type],
[AC_LANG_PUSH([C]) for ax_cv_proto_backtrace_type in size_t int m4_ifnblank([$3],[$3 ])none; do
AS_IF([test "${ax_cv_proto_backtrace_type}" = none],
[ax_cv_proto_backtrace_type= ; break])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([ #include <execinfo.h>
extern
${ax_cv_proto_backtrace_type} backtrace(void **addrlist, ${ax_cv_proto_backtrace_type} len);
char **backtrace_symbols(void *const *buffer, ${ax_cv_proto_backtrace_type} size);
])],
[break]) done
AC_LANG_POP([C])])])
AS_IF([test x${ax_cv_proto_backtrace_type} != x],
[AC_DEFINE_UNQUOTED([backtrace_size_t], [$ax_cv_proto_backtrace_type],
[Defined to return type of backtrace().])])
AC_SEARCH_LIBS([backtrace],[execinfo])
AS_IF([test x"${ax_cv_proto_backtrace_type}" != x -a x"$ac_cv_header_execinfo_h" = xyes -a x"$ac_cv_search_backtrace" != xno],
[AC_DEFINE([HAVE_BACKTRACE],[1],
[Defined if backtrace() could be fully identified.])
]m4_ifnblank([$1],[$1
]),m4_ifnblank([$2],[$2
]))])
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