zig cc: support reading from non-files

    echo 'some C program' | $CC -x c -

Is a common pattern to test for compiler or linker features. This patch
adds support for reading from non-regular files.

This will make at least one more Go test to pass.

1 files changed, 10 insertions, 0 deletions

diff --git a/lib/std/Build/Cache.zig b/lib/std/Build/Cache.zig
index 17429c0370..4fc6784684 100644
--- a/lib/std/Build/Cache.zig
+++ b/lib/std/Build/Cache.zig
@@ -31,6 +31,16 @@ pub const Directory = struct {
         }
     }
 
+    pub fn tmpFilePath(self: Directory, ally: Allocator, suffix: []const u8) error{OutOfMemory}![]const u8 {
+        const s = std.fs.path.sep_str;
+        const rand_int = std.crypto.random.int(u64);
+        if (self.path) |p| {
+            return std.fmt.allocPrint(ally, "{s}" ++ s ++ "tmp" ++ s ++ "{x}-{s}", .{ p, rand_int, suffix });
+        } else {
+            return std.fmt.allocPrint(ally, "tmp" ++ s ++ "{x}-{s}", .{ rand_int, suffix });
+        }
+    }
+
     /// Whether or not the handle should be closed, or the path should be freed
     /// is determined by usage, however this function is provided for convenience
     /// if it happens to be what the caller needs.