`@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, 0 insertions, 6 deletions

diff --git a/src/ir.cpp b/src/ir.cpp
index ea2fcb289f..929f195586 100644
--- a/src/ir.cpp
+++ b/src/ir.cpp
@@ -18670,12 +18670,6 @@ static IrInstruction *ir_analyze_instruction_type_name(IrAnalyze *ira, IrInstruc
 }
 
 static IrInstruction *ir_analyze_instruction_c_import(IrAnalyze *ira, IrInstructionCImport *instruction) {
-    if (ira->codegen->enable_cache) {
-        ir_add_error(ira, &instruction->base,
-            buf_sprintf("TODO @cImport is incompatible with --cache on. The cache system currently is unable to detect subsequent changes in .h files."));
-        return ira->codegen->invalid_instruction;
-    }
-
     AstNode *node = instruction->base.source_node;
     assert(node->type == NodeTypeFnCallExpr);
     AstNode *block_node = node->data.fn_call_expr.params.at(0);