[lit] Remove support for %T

This patch removes support for %T from llvm-lit. For now we mark the
test unresolved and add an error message noting the substitution is
deprecated. This is exactly the same as the error handling for other
substitution failures. We intend to remove support for the nice error
message once 22 branches as users should have moved over by the they are
upgrading to v23.

Reviewers: petrhosek, jh7370, ilovepi, pogo59, cmtice

Reviewed By: cmtice, jh7370, ilovepi

Pull Request: llvm/llvm-project#160028

Author: boomanaiden154

lit/TestRunner.py

@@ -1541,8 +1541,10 @@ def regex_escape(s):
         return s
 
     path_substitutions = [
-        ("s", sourcepath), ("S", sourcedir), ("p", sourcedir),
-        ("t", tmpName), ("T", tmpDir)
+        ("s", sourcepath),
+        ("S", sourcedir),
+        ("p", sourcedir),
+        ("t", tmpName),
     ]
     for path_substitution in path_substitutions:
         letter = path_substitution[0]
@@ -1919,6 +1921,14 @@ def processLine(ln):
             # seems reasonable.
             ln = _caching_re_compile(a).sub(str(b), escapePercents(ln))
 
+        # TODO(boomanaiden154): Remove when we branch LLVM 22 so people on the
+        # release branch will have sufficient time to migrate.
+        if bool(_caching_re_compile("%T").search(ln)):
+            raise ValueError(
+                "%T is no longer supported. Please create directories with names "
+                "based on %t."
+            )
+
         # Strip the trailing newline and any extra whitespace.
         return ln.strip()
 

tests/Inputs/shtest-shell/capital-t-error-message.txt

@@ -0,0 +1,2 @@
+# Check that we return a decent error message when someone uses %T
+# RUN: echo %T > %t

tests/shtest-shell.py

@@ -12,6 +12,10 @@
 
 # CHECK: -- Testing:
 
+# CHECK: UNRESOLVED: shtest-shell :: capital-t-error-message.txt
+# CHECK: *** TEST 'shtest-shell :: capital-t-error-message.txt' FAILED ***
+# CHECK: ValueError: %T is no longer supported. Please create directories with names based on %t.
+
 # CHECK: FAIL: shtest-shell :: colon-error.txt
 # CHECK: *** TEST 'shtest-shell :: colon-error.txt' FAILED ***
 # CHECK: :
@@ -633,5 +637,5 @@
 #      CHECK: ***
 
 # CHECK: PASS: shtest-shell :: valid-shell.txt
-# CHECK: Unresolved Tests (1)
+# CHECK: Unresolved Tests (2)
 # CHECK: Failed Tests (37)