don't try to unit-test generic_fp on known-broken platforms
I.e. 32-bit legacy arm has broken frame pointers backtracing.
This fixes https://github.com/gperftools/gperftools/issues/1512
diff --git a/src/stacktrace.cc b/src/stacktrace.cc
index 75575d6..2698b14 100644
--- a/src/stacktrace.cc
+++ b/src/stacktrace.cc
@@ -372,6 +372,23 @@
// skip null implementation
continue;
}
+#ifdef HAVE_GST_arm
+ if (get_stack_impl == &impl__arm) {
+ // "arm" backtracer is hopelessly broken. So don't test. We
+ // still ship it, though, just in case.
+ continue;
+ }
+#endif // HAVE_GST_arm
+#if defined(HAVE_GST_generic_fp) && (!__x86_64__ && !__i386__ && !__aarch64__ && !__riscv)
+ // Those "major" architectures have functional frame pointer
+ // backtracer and they're built with -fno-omit-frame-pointers
+ // -mno-omit-leaf-frame-pointer. So we do expect those tests to
+ // succeed. Everyone else (e.g. 32-bit legacy arm) is unlikely to
+ // pass.
+ if (get_stack_impl == &impl__generic_fp || get_stack_impl == &impl__generic_fp_unsafe) {
+ continue;
+ }
+#endif // generic_fp && !"good architecture"
break;
} while (true);
