build: fix WriteFile and addCSourceFiles not adding LazyPath deps

Adds a missing call to addLazyPathDependenciesOnly in
std.Build.Module.addCSourceFiles.  Also fixes an issue in
std.Build.Step.WriteFile where it wasn't updating all the GeneratedFile
instances for every directory.  To fix the second issue, I removed
all the GeneratedFile instances and now all files/directories reference
the steps main GeneratedFile via sub paths.

1 files changed, 4 insertions, 2 deletions

diff --git a/test/src/RunTranslatedC.zig b/test/src/RunTranslatedC.zig
index e437a33ba4..59f87c6a82 100644
--- a/test/src/RunTranslatedC.zig
+++ b/test/src/RunTranslatedC.zig
@@ -72,11 +72,13 @@ pub fn addCase(self: *RunTranslatedCContext, case: *const TestCase) void {
     } else if (self.test_filters.len > 0) return;
 
     const write_src = b.addWriteFiles();
-    for (case.sources.items) |src_file| {
+    const first_case = case.sources.items[0];
+    const root_source_file = write_src.add(first_case.filename, first_case.source);
+    for (case.sources.items[1..]) |src_file| {
         _ = write_src.add(src_file.filename, src_file.source);
     }
     const translate_c = b.addTranslateC(.{
-        .root_source_file = write_src.files.items[0].getPath(),
+        .root_source_file = root_source_file,
         .target = b.graph.host,
         .optimize = .Debug,
     });