`@cImport` works with `--cache on`

We pass -MD -MF args to clang when doing `@cImport`, which
gives us a complete list of files that the C code read from.
Then we add these to the cache. So even when using `@cImport`
Zig's caching system remains perfect. This is a proof of concept
for the mechanism that the self-hosted compiler will use to
watch and rebuild files.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/error.cpp b/src/error.cpp
index 9e01a86d8c..c81cfd1683 100644
--- a/src/error.cpp
+++ b/src/error.cpp
@@ -36,6 +36,7 @@ const char *err_str(Error err) {
         case ErrorCacheUnavailable: return "cache unavailable";
         case ErrorPathTooLong: return "path too long";
         case ErrorCCompilerCannotFindFile: return "C compiler cannot find file";
+        case ErrorReadingDepFile: return "failed to read .d file";
     }
     return "(invalid error)";
 }