make the build runner and test runner talk to each other

std.Build.addTest creates a CompileStep as before, however, this kind of
step no longer actually runs the unit tests. Instead it only compiles
it, and one must additionally create a RunStep from the CompileStep in
order to actually run the tests.

RunStep gains integration with the default test runner, which now
supports the standard --listen=- argument in order to communicate over
stdin and stdout. It also reports test statistics; how many passed,
failed, and leaked, as well as directly associating the relevant stderr
with the particular test name that failed.

This separation of CompileStep and RunStep means that
`CompileStep.Kind.test_exe` is no longer needed, and therefore has been
removed in this commit.

 * build runner: show unit test statistics in build summary
 * added Step.writeManifest since many steps want to treat it as a
   warning and emit the same message if it fails.
 * RunStep: fixed error message that prints the failed command printing
   the original argv and not the adjusted argv in case an interpreter
   was used.
 * RunStep: fixed not passing the command line arguments to the
   interpreter.
 * move src/Server.zig to std.zig.Server so that the default test runner
   can use it.
 * the simpler test runner function which is used by work-in-progress
   backends now no longer prints to stderr, which is necessary in order
   for the build runner to not print the stderr as a warning message.

1 files changed, 5 insertions, 4 deletions

diff --git a/src/objcopy.zig b/src/objcopy.zig
index e821a94b59..c3305e8c04 100644
--- a/src/objcopy.zig
+++ b/src/objcopy.zig
@@ -8,8 +8,8 @@ const assert = std.debug.assert;
 
 const main = @import("main.zig");
 const fatal = main.fatal;
-const cleanExit = main.cleanExit;
-const Server = @import("Server.zig");
+const Server = std.zig.Server;
+const build_options = @import("build_options");
 
 pub fn cmdObjCopy(
     gpa: Allocator,
@@ -116,6 +116,7 @@ pub fn cmdObjCopy(
             .gpa = gpa,
             .in = std.io.getStdIn(),
             .out = std.io.getStdOut(),
+            .zig_version = build_options.version,
         });
         defer server.deinit();
 
@@ -124,7 +125,7 @@ pub fn cmdObjCopy(
             const hdr = try server.receiveMessage();
             switch (hdr.tag) {
                 .exit => {
-                    return cleanExit();
+                    return std.process.cleanExit();
                 },
                 .update => {
                     if (seen_update) {
@@ -144,7 +145,7 @@ pub fn cmdObjCopy(
             }
         }
     }
-    return cleanExit();
+    return std.process.cleanExit();
 }
 
 const usage =