docker/alpine-edge/nginx-mainline/patches/modpagespeed/stack_trace_posix.patch

--- a/third_party/chromium/src/base/debug/stack_trace_posix.cc
+++ b/third_party/chromium/src/base/debug/stack_trace_posix.cc
@@ -5,7 +5,9 @@
 #include "base/debug/stack_trace.h"

 #include <errno.h>
+#if defined(HAVE_BACKTRACE)
 #include <execinfo.h>
+#endif
 #include <fcntl.h>
 #include <signal.h>
 #include <stdio.h>
@@ -64,7 +66,7 @@
   // Note: code in this function is NOT async-signal safe (std::string uses
   // malloc internally).

-#if defined(__GLIBCXX__)
+#if defined(__GLIBCXX__) && defined(HAVE_BACKTRACE)

   std::string::size_type search_from = 0;
   while (search_from < text->size()) {
@@ -145,7 +147,7 @@

     handler->HandleOutput("\n");
   }
-#else
+#elif defined(HAVE_BACKTRACE)
   bool printed = false;

   // Below part is async-signal unsafe (uses malloc), so execute it only
@@ -469,23 +471,31 @@
 StackTrace::StackTrace() {
   // NOTE: This code MUST be async-signal safe (it's used by in-process
   // stack dumping signal handler). NO malloc or stdio is allowed here.
-
+#if defined(HAVE_BACKTRACE)
   // Though the backtrace API man page does not list any possible negative
   // return values, we take no chance.
   count_ = std::max(backtrace(trace_, arraysize(trace_)), 0);
+#else
+  count_ = 0;
+#endif
 }

 void StackTrace::Print() const {
   // NOTE: This code MUST be async-signal safe (it's used by in-process
   // stack dumping signal handler). NO malloc or stdio is allowed here.
-
+#if defined(HAVE_BACKTRACE)
   PrintBacktraceOutputHandler handler;
   ProcessBacktrace(trace_, count_, &handler);
+#endif
 }

 void StackTrace::OutputToStream(std::ostream* os) const {
+#if !defined(HAVE_BACKTRACE)
+(*os) << "(stack trace not supported)\n";
+#else
   StreamBacktraceOutputHandler handler(os);
   ProcessBacktrace(trace_, count_, &handler);
+#endif
 }

 namespace internal {