From: Raph Levien <raph@google.com>
Date: Thu, 26 Jan 2017 21:12:14 +0000 (-0800)
Subject: Buffer file writing for dep-info
X-Git-Tag: archive/raspbian/0.35.0-2+rpi1~3^2^2^2^2^2^2^2~22^2~11^2~12^2~2
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=abf8e35611d9681dfa8cae3d296b2ac28209be35;p=cargo.git

Buffer file writing for dep-info

Use BufWriter when generating .d files with dep-info, to avoid
excessive numbers of write syscalls.
---

diff --git a/src/cargo/ops/cargo_rustc/output_depinfo.rs b/src/cargo/ops/cargo_rustc/output_depinfo.rs
index add28e023..5ed98eb11 100644
--- a/src/cargo/ops/cargo_rustc/output_depinfo.rs
+++ b/src/cargo/ops/cargo_rustc/output_depinfo.rs
@@ -1,5 +1,5 @@
 use std::collections::HashSet;
-use std::io::Write;
+use std::io::{Write, BufWriter};
 use std::fs::File;
 use std::path::{Path, PathBuf};
 
@@ -53,7 +53,7 @@ pub fn output_depinfo<'a, 'b>(context: &mut Context<'a, 'b>, unit: &Unit<'a>) ->
         if let Some(link_dst) = link_dst {
             let output_path = link_dst.with_extension("d");
             let target_fn = render_filename(link_dst, basedir)?;
-            let mut outfile = File::create(output_path)?;
+            let mut outfile = BufWriter::new(File::create(output_path)?);
             write!(outfile, "{}:", target_fn)?;
             for dep in &deps {
                 write!(outfile, " {}", render_filename(dep, basedir)?)?;