package/glog: fix build without threads

Fixes:
 - http://autobuild.buildroot.net/results/5320bbe1205e782e3516d9bead8d1ed825bcbaad

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/glog/0002-src-utilities-fix-build-without-pthread.patch

@@ -0,0 +1,81 @@
+From 5a1857a2b537a95234a6ad40bc382e6e75de45de Mon Sep 17 00:00:00 2001
+From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+Date: Tue, 29 Oct 2019 13:52:34 +0100
+Subject: [PATCH] src/utilities: fix build without pthread
+
+Fixes:
+ - http://autobuild.buildroot.net/results/5320bbe1205e782e3516d9bead8d1ed825bcbaad
+
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+[Upstream status: not sent yet]
+---
+ src/utilities.cc | 8 +++++++-
+ src/utilities.h  | 2 ++
+ 2 files changed, 9 insertions(+), 1 deletion(-)
+
+diff --git a/src/utilities.cc b/src/utilities.cc
+index 6562a54..8ad0319 100644
+--- a/src/utilities.cc
++++ b/src/utilities.cc
+@@ -61,7 +61,9 @@ using std::string;
+ _START_GOOGLE_NAMESPACE_
+ 
+ static const char* g_program_invocation_short_name = NULL;
++#ifdef HAVE_PTHREAD
+ static pthread_t g_main_thread_id;
++#endif
+ 
+ _END_GOOGLE_NAMESPACE_
+ 
+@@ -181,6 +183,7 @@ bool IsGoogleLoggingInitialized() {
+   return g_program_invocation_short_name != NULL;
+ }
+ 
++#ifdef HAVE_PTRHEAD
+ bool is_default_thread() {
+   if (g_program_invocation_short_name == NULL) {
+     // InitGoogleLogging() not yet called, so unlikely to be in a different
+@@ -190,6 +193,7 @@ bool is_default_thread() {
+     return pthread_equal(pthread_self(), g_main_thread_id);
+   }
+ }
++#endif
+ 
+ #ifdef OS_WINDOWS
+ struct timeval {
+@@ -276,7 +280,7 @@ pid_t GetTID() {
+   return getpid();  // Linux:  getpid returns thread ID when gettid is absent
+ #elif defined OS_WINDOWS && !defined OS_CYGWIN
+   return GetCurrentThreadId();
+-#else
++#elif HAVE_PTHREAD
+   // If none of the techniques above worked, we use pthread_self().
+   return (pid_t)(uintptr_t)pthread_self();
+ #endif
+@@ -350,7 +354,9 @@ void InitGoogleLoggingUtilities(const char* argv0) {
+   if (!slash)  slash = strrchr(argv0, '\\');
+ #endif
+   g_program_invocation_short_name = slash ? slash + 1 : argv0;
++#ifdef HAVE_PTHREAD
+   g_main_thread_id = pthread_self();
++#endif
+ 
+ #ifdef HAVE_STACKTRACE
+   InstallFailureFunction(&DumpStackTraceAndExit);
+diff --git a/src/utilities.h b/src/utilities.h
+index ca21cfb..af969d3 100644
+--- a/src/utilities.h
++++ b/src/utilities.h
+@@ -163,7 +163,9 @@ const char* ProgramInvocationShortName();
+ 
+ bool IsGoogleLoggingInitialized();
+ 
++#ifdef HAVE_PTHREAD
+ bool is_default_thread();
++#endif
+ 
+ int64 CycleClock_Now();
+ 
+-- 
+2.23.0
+