================
@@ -652,6 +652,134 @@ in the future. The expected roadmap for Reduced BMIs as
of Clang 19.x is:
comes, the term BMI will refer to the Reduced BMI and the Full BMI will only
be meaningful to build systems which elect to support two-phase compilation.
+Experimental No Transitive Change
+---------------------------------
+
+Starting with clang19.x, we introduced an experimental feature: the
non-transitive
+change for modules, aimed at reducing unnecessary recompilations. For example,
+
+.. code-block:: c++
+
+ // m-partA.cppm
+ export module m:partA;
+
+ // m-partB.cppm
+ export module m:partB;
+ export int getB() { return 44; }
+
+ // m.cppm
+ export module m;
+ export import :partA;
+ export import :partB;
+
+ // useBOnly.cppm
+ export module useBOnly;
+ import m;
+ export int B() {
+ return getB();
+ }
+
+ // Use.cc
+ import useBOnly;
+ int get() {
+ return B();
+ }
+
+Now let's compile the project (For brevity, some commands are omitted.):
----------------
ChuanqiXu9 wrote:
Done
https://github.com/llvm/llvm-project/pull/96453
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