build: Generate asm_support_gen.h from the build, validate up-to-date

When building libart/libartd, also generate asm_support_gen.h
automatically. In addition, verify that our checked-in version
(runtime/generated/asm_support_gen.h) is up-to-date with what the build
generates.

Furthermore, add a presubmit hook that runs with 'repo upload'
that validates that the up-to-date version of asm_support_gen.h
is being uploaded to gerrit.

This makes it significantly more difficult to accidentally
merge a CL that doesn't have the auto-generated headers updated
and break the build as a result.

Bug: 34387670
Test: make libart libartd
Test: cd art && tools/repohooks/pre-upload.py
Change-Id: I1f0f94914d328c396906583d0732e281c076e69f

1 files changed, 11 insertions, 0 deletions

diff --git a/tools/cpp-define-generator/Android.bp b/tools/cpp-define-generator/Android.bp
index d792e906ef..acb53a1ff9 100644
--- a/tools/cpp-define-generator/Android.bp
+++ b/tools/cpp-define-generator/Android.bp
@@ -34,3 +34,14 @@ art_cc_binary {
         "libbase",
     ],
 }
+
+// Note: See $OUT_DIR/soong/build.ninja
+// For the exact filename that this generates to run make command on just
+// this rule later.
+genrule {
+  name: "cpp-define-generator-asm-support",
+  out: ["asm_support_gen.h"],
+  tools: ["cpp-define-generator-data"],
+  tool_files: ["verify-asm-support"],
+  cmd: "$(location verify-asm-support) --quiet \"$(location cpp-define-generator-data)\" \"$(out)\""
+}