From 0d4db8828a9efc05b5c3622098a8337de0b62d1e Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Mon, 25 Feb 2019 14:03:36 -0500
Subject: `@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.
---
 src/os.cpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'src/os.cpp')

diff --git a/src/os.cpp b/src/os.cpp
index 95febca9bc..f52325af00 100644
--- a/src/os.cpp
+++ b/src/os.cpp
@@ -1232,6 +1232,18 @@ static Error os_buf_to_tmp_file_posix(Buf *contents, Buf *suffix, Buf *out_tmp_p
 }
 #endif
 
+Buf *os_tmp_filename(Buf *prefix, Buf *suffix) {
+    Buf *result = buf_create_from_buf(prefix);
+
+    const char base64[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_";
+    assert(array_length(base64) == 64 + 1);
+    for (size_t i = 0; i < 12; i += 1) {
+        buf_append_char(result, base64[rand() % 64]);
+    }
+    buf_append_buf(result, suffix);
+    return result;
+}
+
 #if defined(ZIG_OS_WINDOWS)
 static Error os_buf_to_tmp_file_windows(Buf *contents, Buf *suffix, Buf *out_tmp_path) {
     char tmp_dir[MAX_PATH + 1];
-- 
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