CI fixes

 - Temp workaround for relacy to compile in CI
 - Do not build Relacy tests with sanitizers by default

Author: ccotter

CMakeLists.txt

@@ -152,10 +152,17 @@ endif()
 
 # Build relacy tests by default only for GNU compiler and if tests are enabled
 # It will take work to get other platforms to work in the future.
-if(${STDEXEC_BUILD_TESTS} AND ${CMAKE_CXX_COMPILER_ID} STREQUAL "GNU")
-    set(STDEXEC_BUILD_RELACY_TESTS_DEFAULT ON)
+# Additionally, do not build the Relacy tests when a sanitizer is active. TSAN
+# doesn't do anything since Relacy simulates threads with fibers anyway. Relacy
+# has primtive (compared to ASAN) use-after-free detection which doesn't compose
+# with ASAN.
+if(
+  ${STDEXEC_BUILD_TESTS} AND
+  CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND
+  NOT CMAKE_CXX_FLAGS MATCHES "-fsanitize")
+  set(STDEXEC_BUILD_RELACY_TESTS_DEFAULT ON)
 else()
-    set(STDEXEC_BUILD_RELACY_TESTS_DEFAULT OFF)
+  set(STDEXEC_BUILD_RELACY_TESTS_DEFAULT OFF)
 endif()
 option(STDEXEC_BUILD_RELACY_TESTS "Build stdexec relacy tests" ${STDEXEC_BUILD_RELACY_TESTS_DEFAULT})
 

test/rrd/shared_mutex

@@ -0,0 +1,15 @@
+// Temporary workaround until upstream Relacy provides a fakestd header for shared_mutex
+// stdexec pulls in shared_mutex through TBB,
+//   In file included from /usr/include/c++/13/shared_mutex:42,
+//                    from /usr/include/c++/13/memory_resource:62,
+//                    from /usr/include/oneapi/tbb/cache_aligned_allocator.h:26,
+//                    from /usr/include/oneapi/tbb/partitioner.h:46,
+//                    from /usr/include/oneapi/tbb/parallel_for.h:27,
+//                    from /usr/include/tbb/parallel_for.h:17,
+//                    from /usr/include/c++/13/pstl/parallel_backend_tbb.h:20,
+//                    from /usr/include/c++/13/pstl/parallel_backend.h:20,
+//                    from /usr/include/c++/13/pstl/algorithm_impl.h:22,
+//                    from /usr/include/c++/13/pstl/glue_execution_defs.h:50,
+//                    from /usr/include/c++/13/execution:34,
+//                    from /home/coder/stdexec/test/rrd/../../include/exec/../stdexec/__detail/__execution_legacy.hpp:21,
+#pragma once