Always pass NO_STOP_MESSAGE to Fortran tests

Fortran/CMakeLists.txt

@@ -17,3 +17,5 @@ if (NOT WIN32 AND NOT APPLE)
     add_subdirectory(gfortran)
   endif()
 endif()
+
+file(COPY lit.local.cfg DESTINATION "${CMAKE_CURRENT_BINARY_DIR}")

Fortran/Readme.txt

@@ -0,0 +1,5 @@
+By default LLVM flang prints a stop message in certain circumstances that 
+breaks some of the tests in this directory. As such we add the environment 
+variable NO_STOP_MESSAGE=1 to disable this behaviour. If we wish to add tests
+in future that need to check the stop message, those can be added in a 
+subdirectory with a lit.local.cfg that unsets this environment variable.

Fortran/UnitTests/fcvs21_f95/lit.local.cfg

@@ -1,8 +1,2 @@
 config.traditional_output = True
 config.single_source = True
-
-# Flang uses NO_STOP_MESSAGE to control the output of the STOP statement. If
-# it is present in the environment, we should forward it to the tests, otherwise
-# they might choke on warnings about signaling INEXACT exceptions.
-if "NO_STOP_MESSAGE" in os.environ:
-    config.environment["NO_STOP_MESSAGE"] = os.environ["NO_STOP_MESSAGE"]

Fortran/UnitTests/finalization/lit.local.cfg

@@ -1,8 +1,2 @@
 config.traditional_output = True
 config.single_source = True
-
-# Flang uses NO_STOP_MESSAGE to control the output of the STOP statement. If
-# it is present in the environment, we should forward it to the tests, otherwise
-# they might choke on warnings about signaling INEXACT exceptions.
-if "NO_STOP_MESSAGE" in os.environ:
-    config.environment["NO_STOP_MESSAGE"] = os.environ["NO_STOP_MESSAGE"]

Fortran/lit.local.cfg

@@ -0,0 +1,4 @@
+# Flang uses NO_STOP_MESSAGE to control the output of the STOP statement.
+# We should set it for running the tests, otherwise they might choke on warnings
+# about signaling INEXACT exceptions.
+config.environment["NO_STOP_MESSAGE"] = "1"