[XRay] [compiler-rt] Skip tests that use 'llvm_xray' for standalone builds.

[kpw]

Summary

Tests that generate output with compiler-rt and verify it with the llvm_xray
command (built from the llvm tree) are extremely convenient, but compiler-rt
can be built out of tree and llvm_xray is not built for every target.

This change intends to disable tests for out of tree builds, but does nothing
to detect whether llvm_xray can be found elsewhere on the path, is fresh enough,
or is part of a build target for the in tree build.

Tested:

Tested that this didn't break check-xray. Haven't reproduced bots or standalone
builds.

[dberris]

LGTM -- thanks @kpw!

compiler-rt/trunk/test/xray/TestCases/Linux/fdr-mode.cc

 // RUN: %clangxx_xray -g -std=c++11 %s -o %t
 // RUN: XRAY_OPTIONS="patch_premain=false xray_naive_log=false xray_logfile_base=fdr-logging-test- xray_fdr_log=true verbosity=1 xray_fdr_log_func_duration_threshold_us=0" %run %t 2>&1 | FileCheck %s
 // RUN: XRAY_OPTIONS="patch_premain=false xray_naive_log=false xray_logfile_base=fdr-unwrite-test- xray_fdr_log=true verbosity=1 xray_fdr_log_func_duration_threshold_us=5000" %run %t 2>&1 | FileCheck %s
 // RUN: %llvm_xray convert --symbolize --output-format=yaml -instr_map=%t "`ls fdr-logging-test-* | head -1`" | FileCheck %s --check-prefix=TRACE
 // RUN: %llvm_xray convert --symbolize --output-format=yaml -instr_map=%t "`ls fdr-unwrite-test-* | head -1`" | FileCheck %s --check-prefix=UNWRITE
 // RUN: rm fdr-logging-test-*
 // RUN: rm fdr-unwrite-test-*
 // FIXME: Make llvm-xray work on non-x86_64 as well.
 // REQUIRES: x86_64-linux
+// REQUIRES: built-in-llvm-tree
 
 #include "xray/xray_log_interface.h"
 #include <cassert>
 #include <chrono>
 #include <cstdio>
 #include <iostream>
 #include <stdlib.h>
 #include <thread>

compiler-rt/trunk/test/xray/TestCases/Linux/fdr-thread-order.cc

 // RUN: %clangxx_xray -g -std=c++11 %s -o %t
 // RUN: XRAY_OPTIONS="patch_premain=false xray_naive_log=false xray_logfile_base=fdr-thread-order. xray_fdr_log=true verbosity=1" %run %t 2>&1 | FileCheck %s
 // RUN: %llvm_xray convert --symbolize --output-format=yaml -instr_map=%t "`ls fdr-thread-order.* | head -1`" | FileCheck %s --check-prefix TRACE
 // RUN: rm fdr-thread-order.*
 // FIXME: Make llvm-xray work on non-x86_64 as well.
 // REQUIRES: x86_64-linux
+// REQUIRES: built-in-llvm-tree
+
 #include "xray/xray_log_interface.h"
 #include <thread>
 #include <cassert>
 
 constexpr auto kBufferSize = 16384;
 constexpr auto kBufferMax = 10;
 
 thread_local uint64_t var = 0;

compiler-rt/trunk/test/xray/lit.site.cfg.in

 @LIT_SITE_CFG_IN_HEADER@
 
 # Tool-specific config options.
 config.name_suffix = "@XRAY_TEST_CONFIG_SUFFIX@"
 config.xray_lit_source_dir = "@XRAY_LIT_SOURCE_DIR@"
 config.target_cflags = "@XRAY_TEST_TARGET_CFLAGS@"
 config.target_arch = "@XRAY_TEST_TARGET_ARCH@"
+config.built_with_llvm = ("@COMPILER_RT_STANDALONE_BUILD@" == "FALSE")
+
+if config.built_with_llvm:
+  config.available_features.add('built-in-llvm-tree')
 
 # Load common config for all compiler-rt lit tests
 lit_config.load_config(config, "@COMPILER_RT_BINARY_DIR@/test/lit.common.configured")
 
 # Load tool-specific config that would do the real work.
 lit_config.load_config(config, "@XRAY_LIT_SOURCE_DIR@/lit.cfg")