@node ax_execinfo
@unnumberedsec ax_execinfo

@majorheading Synopsis

@smallexample
AX_EXECINFO([ACTION-IF-EXECINFO-H-IS-FOUND], [ACTION-IF-EXECINFO-H-IS-NOT-FOUND], [ADDITIONAL-TYPES-LIST])
@end smallexample

@majorheading 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.

@majorheading Source Code

Download the
@uref{http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=blob_plain;f=m4/ax_execinfo.m4,latest
version of @file{ax_execinfo.m4}} or browse
@uref{http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=history;f=m4/ax_execinfo.m4,the
macro's revision history}.

@majorheading License

@w{Copyright @copyright{} 2014 Thomas Jahns @email{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.