[libcxx][test] Fix empty.gen selftest on windows (#69403)

wdunicornpro · web-flow · commit 3daa771047e1 · 2023-10-19T12:30:05.000-07:00
Using `true` as a no-op unfortunately does not work on windows, which
fails libcxx lit tests on windows. Lit provides the `:` internal shell
builtin which is equivalent to `true`.
diff --git a/libcxx/test/libcxx/selftest/gen.cpp/empty.gen.cpp b/libcxx/test/libcxx/selftest/gen.cpp/empty.gen.cpp
@@ -8,4 +8,4 @@
 
 // Make sure we can generate no tests at all
 
-// RUN: true
+// RUN: :
diff --git a/libcxx/test/libcxx/selftest/sh.cpp/run-success.sh.cpp b/libcxx/test/libcxx/selftest/sh.cpp/run-success.sh.cpp
@@ -8,4 +8,4 @@
 
 // Make sure the test passes if it succeeds to run
 
-// RUN: true
+// RUN: :

Original file line number	Diff line number	Diff line change
`@@ -8,4 +8,4 @@`
`8`	`8`
`9`	`9`	`// Make sure we can generate no tests at all`
`10`	`10`
`11`		`-// RUN: true`
	`11`	`+// RUN: :`
Original file line number	Diff line number	Diff line change
`@@ -8,4 +8,4 @@`
`8`	`8`
`9`	`9`	`// Make sure the test passes if it succeeds to run`
`10`	`10`
`11`		`-// RUN: true`
	`11`	`+// RUN: :`