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# Check for GNU-style execinfo.h.
dnl Copyright 2012-2023 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_EXECINFO_H],
[
AC_CHECK_HEADERS_ONCE([execinfo.h])
LIB_EXECINFO=''
GL_GENERATE_EXECINFO_H=true
if test $ac_cv_header_execinfo_h = yes; then
gl_saved_libs=$LIBS
AC_SEARCH_LIBS([backtrace_symbols_fd], [execinfo],
[test "$ac_cv_search_backtrace_symbols_fd" = "none required" ||
LIB_EXECINFO=$ac_cv_search_backtrace_symbols_fd])
LIBS=$gl_saved_libs
if test "$ac_cv_search_backtrace_symbols_fd" != no; then
GL_GENERATE_EXECINFO_H=false
fi
fi
AC_SUBST([LIB_EXECINFO])
])
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