Make various error-related globals thread-local

This changes bfd_error et al to be thread-local.

	* Makefile.in: Regenerate.
	* aclocal.m4: Include ax_tls.m4.
	* ax_tls.m4: New file.
	* bfd.c: (bfd_error, input_error, input_bfd, _bfd_error_buf):
	Now thread-local.
	(bfd_asprintf): Update docs.
	* config.in, configure: Regenerate.
	* configure.ac: Call AX_TLS.
	* po/bfd.pot: Regenerate.

1 files changed, 51 insertions, 0 deletions

diff --git a/bfd/configure b/bfd/configure
index f0a07ff..de94019 100755
--- a/bfd/configure
+++ b/bfd/configure
@@ -13283,6 +13283,57 @@ $as_echo "#define USE_BINARY_FOPEN 1" >>confdefs.h
  ;;
 esac
 
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for thread local storage (TLS) class" >&5
+$as_echo_n "checking for thread local storage (TLS) class... " >&6; }
+  if ${ac_cv_tls+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  for ax_tls_keyword in thread_local _Thread_local __thread '__declspec(thread)' none; do
+       case $ax_tls_keyword in #(
+  none) :
+    ac_cv_tls=none ; break ;; #(
+  *) :
+    cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdlib.h>
+int
+main ()
+{
+static  $ax_tls_keyword  int bar;
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  ac_cv_tls=$ax_tls_keyword ; break
+else
+  ac_cv_tls=none
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+         ;;
+esac
+    done
+
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_tls" >&5
+$as_echo "$ac_cv_tls" >&6; }
+
+  if test "$ac_cv_tls" != "none"; then :
+
+cat >>confdefs.h <<_ACEOF
+#define TLS $ac_cv_tls
+_ACEOF
+
+     :
+else
+  :
+fi
+
+
 # Link in zlib/zstd if we can.  This allows us to read compressed debug sections.
 # This is used only by compress.c.