[clang] [compiler-rt] [compiler-rt] Realtime Sanitizer: Introduce Realtime Sanitizer (RTSan) backend (PR #92460)

[Chris Apple via llvm-commits]

cjappl wrote:

This patch I have a strong hunch fixes issue 1 in my comment above. This patch compiles and runs on my linux container and my mac, proving it doesn't affect compilation on those two systems.

```
diff --git a/compiler-rt/lib/rtsan/tests/CMakeLists.txt b/compiler-rt/lib/rtsan/tests/CMakeLists.txt
index d96e538b255f..e539ebc387e0 100644
--- a/compiler-rt/lib/rtsan/tests/CMakeLists.txt
+++ b/compiler-rt/lib/rtsan/tests/CMakeLists.txt
@@ -60,7 +60,7 @@ foreach(arch ${RTSAN_TEST_ARCH})
   #  RtsanUnitTests "Rtsan-${arch}-Test" ${arch}
   #  COMPILE_DEPS ${RTSAN_UNITTEST_HEADERS}
   #  SOURCES ${RTSAN_INST_TEST_SOURCES} ${COMPILER_RT_GOOGLETEST_SOURCES}
-  #  DEPS llvm_gtest rtsan
+  #  DEPS rtsan
   #  CFLAGS ${RTSAN_UNITTEST_CFLAGS} -fsanitize=realtime
   #  LINK_FLAGS ${RTSAN_UNITTEST_LINK_FLAGS} -fsanitize=realtime)

@@ -94,7 +94,6 @@ foreach(arch ${RTSAN_TEST_ARCH})
     COMPILE_DEPS ${RTSAN_UNITTEST_HEADERS}
     SOURCES ${RTSAN_NOINST_TEST_SOURCES}
             ${COMPILER_RT_GOOGLETEST_SOURCES}
-    DEPS llvm_gtest
     CFLAGS ${RTSAN_UNITTEST_CFLAGS}
     LINK_FLAGS ${RTSAN_UNITTEST_LINK_FLAGS}
     RUNTIME ${RTSAN_TEST_RUNTIME})
```

This also better matches the other sanitizers, llvm_gtest is a dependency in llvm, anything in compiler-rt using gtest just uses the sources directly as seen in:

```
SOURCES ${RTSAN_NOINST_TEST_SOURCES}
             ${COMPILER_RT_GOOGLETEST_SOURCES}
```

https://github.com/llvm/llvm-project/pull/92460