[Buildroot] [git commit] xerces: fix buid with older cmake

[Thomas Petazzoni]

commit: https://git.buildroot.net/buildroot/commit/?id=b449ba80077d94e503521a53bc7e2613901dd1c7
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/master

Old version of cmake break cross-compilation when FindThreads is used
because of a try_run call. Add a workaround that avoids try_run.

cmake bug report: https://gitlab.kitware.com/cmake/cmake/issues/16920

Fixes:
 - http://autobuild.buildroot.org/results/784918c58310474e8b4a0b42850a55ba35a1a19e

Signed-off-by: Fabrice Fontaine <fontaine.fabrice at gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni at bootlin.com>
---
 package/xerces/xerces.mk | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/package/xerces/xerces.mk b/package/xerces/xerces.mk
index 906e4b663c..c75a8b0d35 100644
--- a/package/xerces/xerces.mk
+++ b/package/xerces/xerces.mk
@@ -17,6 +17,11 @@ endef
 
 XERCES_POST_PATCH_HOOKS += XERCES_DISABLE_SAMPLES
 
+# Before CMake 3.10, passing THREADS_PTHREAD_ARG=OFF was needed to
+# disable a try_run() call in the FindThreads tests, which caused a
+# build failure when cross-compiling.
+XERCES_CONF_OPTS += -DTHREADS_PTHREAD_ARG=OFF
+
 ifeq ($(BR2_PACKAGE_ICU),y)
 XERCES_DEPENDENCIES += icu
 endif