From 77c89f62f106d88ef2b5963f4a13755c337c793d Mon Sep 17 00:00:00 2001
From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Date: Mon, 15 Feb 2021 07:56:29 +0100
Subject: [PATCH] configure.ac: fix build without threads

Cross-compilation of libgpg-error fails on toolchain without threads
since commit 988211d3d4c1f3d5cfa6b460210f65ab636763b5,
9ee011259f819a3cf50fe7019fa4366dbc437e0e and
50e62b36ea01ed25d12c443088b85d4f41a2b3e1

Indeed, since that time, libgpg-error assumes that pthread.h is always
available resulting in the following error at configure time:

checking for arm-unknown-linux-gnueabi-objdump... (cached) /tmp/instance-1/output-1/host/bin/arm-linux-objdump
conftest.c:1:10: fatal error: pthread.h: No such file or directory
    1 | #include <pthread.h>
      |          ^~~~~~~~~~~
compilation terminated.
configure: generated src/lock-obj-pub.native.h using arm-unknown-linux-gnueabi-objdump and gawk
checking whether to enable log_clock... no

This error will in turn results in a build failure because
"Can't determine mutex size" is echoed by gen-lock-obj.sh:

In file included from strsource-sym.c:27:
./gpg-error.h:1115:4: warning: missing terminating ' character
 1115 | Can't determine mutex size
      |    ^

Full build log:
http://autobuild.buildroot.org/results/334/3344c96e5627a9327b0eabe0b27f34490bbabc0d/build-end.log

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
[Upstream status: https://dev.gnupg.org/T5296]
---
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index b9a2a3e..15d9fdc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -599,7 +599,7 @@ if test x$cross_compiling = xyes; then
   case $host in
     *-*-linux*)
     AC_CHECK_TOOL(OBJDUMP, [objdump])
-    if test -n "$OBJDUMP"; then
+    if test -n "$OBJDUMP" -a x"$gl_use_threads" != xno; then
       lock_obj_h_generated=yes
       if test ! -d src; then mkdir src; fi
       LOCK_ABI_VERSION=1 host=$host host_alias=$host_alias \
-- 
2.30.0