+ LIB_EXECINFO=''
+ EXECINFO_H='execinfo.h'
+
+ if test $ac_cv_header_execinfo_h = yes; then
+ gl_saved_libs=$LIBS
+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing backtrace_symbols_fd" >&5
+$as_echo_n "checking for library containing backtrace_symbols_fd... " >&6; }
+if test "${ac_cv_search_backtrace_symbols_fd+set}" = set; then :
+ $as_echo_n "(cached) " >&6
+else
+ ac_func_search_save_LIBS=$LIBS
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+
+/* Override any GCC internal prototype to avoid an error.
+ Use char because int might match the return type of a GCC
+ builtin and then its argument prototype would still apply. */
+#ifdef __cplusplus
+extern "C"
+#endif
+char backtrace_symbols_fd ();
+int
+main ()
+{
+return backtrace_symbols_fd ();
+ ;
+ return 0;
+}
+_ACEOF
+for ac_lib in '' execinfo; do
+ if test -z "$ac_lib"; then
+ ac_res="none required"
+ else
+ ac_res=-l$ac_lib
+ LIBS="-l$ac_lib $ac_func_search_save_LIBS"
+ fi
+ if ac_fn_c_try_link "$LINENO"; then :
+ ac_cv_search_backtrace_symbols_fd=$ac_res
+fi
+rm -f core conftest.err conftest.$ac_objext \
+ conftest$ac_exeext
+ if test "${ac_cv_search_backtrace_symbols_fd+set}" = set; then :
+ break
+fi
+done
+if test "${ac_cv_search_backtrace_symbols_fd+set}" = set; then :
+
+else
+ ac_cv_search_backtrace_symbols_fd=no
+fi
+rm conftest.$ac_ext
+LIBS=$ac_func_search_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_search_backtrace_symbols_fd" >&5
+$as_echo "$ac_cv_search_backtrace_symbols_fd" >&6; }
+ac_res=$ac_cv_search_backtrace_symbols_fd
+if test "$ac_res" != no; then :
+ test "$ac_res" = "none required" || LIBS="$ac_res $LIBS"
+ test "$ac_cv_search_backtrace_symbols_fd" = "none required" ||
+ LIB_EXECINFO=$ac_cv_search_backtrace_symbols_fd
+fi
+
+ LIBS=$gl_saved_libs
+ test "$ac_cv_search_backtrace_symbols_fd" = no || EXECINFO_H=''
+ fi
+
+ if test -n "$EXECINFO_H"; then
+
+
+
+
+
+
+
+
+ gl_LIBOBJS="$gl_LIBOBJS execinfo.$ac_objext"
+
+ fi
+
+
+
+ if test -n "$EXECINFO_H"; then
+ GL_GENERATE_EXECINFO_H_TRUE=
+ GL_GENERATE_EXECINFO_H_FALSE='#'
+else
+ GL_GENERATE_EXECINFO_H_TRUE='#'
+ GL_GENERATE_EXECINFO_H_FALSE=
+fi
+
+
+
+
+
+
+
+
+
+
+ fp_headers='
+# include <stdio.h>
+# if HAVE_STDIO_EXT_H
+# include <stdio_ext.h>
+# endif
+'
+ ac_fn_c_check_decl "$LINENO" "__fpending" "ac_cv_have_decl___fpending" "$fp_headers
+"
+if test "x$ac_cv_have_decl___fpending" = x""yes; then :
+ ac_have_decl=1
+else
+ ac_have_decl=0
+fi
+
+cat >>confdefs.h <<_ACEOF
+#define HAVE_DECL___FPENDING $ac_have_decl
+_ACEOF
+
+
+ if test $ac_cv_func___fpending = no; then
+
+
+
+
+
+
+
+
+ gl_LIBOBJS="$gl_LIBOBJS fpending.$ac_objext"
+
+
+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking how to determine the number of pending output bytes on a stream" >&5
+$as_echo_n "checking how to determine the number of pending output bytes on a stream... " >&6; }
+if test "${ac_cv_sys_pending_output_n_bytes+set}" = set; then :
+ $as_echo_n "(cached) " >&6
+else
+
+ for ac_expr in \
+ \
+ '# glibc2' \
+ 'fp->_IO_write_ptr - fp->_IO_write_base' \
+ \
+ '# traditional Unix' \
+ 'fp->_ptr - fp->_base' \
+ \
+ '# BSD' \
+ 'fp->_p - fp->_bf._base' \
+ \
+ '# SCO, Unixware' \
+ '(fp->__ptr ? fp->__ptr - fp->__base : 0)' \
+ \
+ '# QNX' \
+ '(fp->_Mode & 0x2000 /*_MWRITE*/ ? fp->_Next - fp->_Buf : 0)' \
+ \
+ '# old glibc?' \
+ 'fp->__bufp - fp->__buffer' \
+ \
+ '# old glibc iostream?' \
+ 'fp->_pptr - fp->_pbase' \
+ \
+ '# emx+gcc' \
+ 'fp->_ptr - fp->_buffer' \
+ \
+ '# Minix' \
+ 'fp->_ptr - fp->_buf' \
+ \
+ '# Plan9' \
+ 'fp->wp - fp->buf' \
+ \
+ '# VMS' \
+ '(*fp)->_ptr - (*fp)->_base' \
+ \
+ '# e.g., DGUX R4.11; the info is not available' \
+ 1 \
+ ; do
+
+ # Skip each embedded comment.
+ case "$ac_expr" in '#'*) continue;; esac
+
+ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+#include <stdio.h>
+int
+main ()
+{
+FILE *fp = stdin; (void) ($ac_expr);
+ ;
+ return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+ fp_done=yes
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+ test "$fp_done" = yes && break
+ done
+
+ ac_cv_sys_pending_output_n_bytes=$ac_expr
+
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_sys_pending_output_n_bytes" >&5
+$as_echo "$ac_cv_sys_pending_output_n_bytes" >&6; }
+
+cat >>confdefs.h <<_ACEOF
+#define PENDING_OUTPUT_N_BYTES $ac_cv_sys_pending_output_n_bytes
+_ACEOF
+
+
+ fi
+
+
+# Persuade glibc <stdlib.h> to declare getloadavg().
+
+
+gl_save_LIBS=$LIBS
+
+# getloadvg is present in libc on glibc >= 2.2, Mac OS X, FreeBSD >= 2.0,
+# NetBSD >= 0.9, OpenBSD >= 2.0, Solaris >= 7.
+HAVE_GETLOADAVG=1
+ac_fn_c_check_func "$LINENO" "getloadavg" "ac_cv_func_getloadavg"
+if test "x$ac_cv_func_getloadavg" = x""yes; then :