Auto merge of #2630 - alexcrichton:build-script-warnings, r=brson

Add build script warnings, streaming output from build scripts to the console

These commits add a few features to Cargo:

* Cargo now recognizes the `warning` key in build scripts and will print warnings *after a build script has completed* if the build script is for a path dependency. That is, if a build script prints `cargo:warning=foo` then Cargo will forward that to the console if the crate's being developed.

* Cargo now accepts multiple `-v` flags for all commands. The `-vv` flag prints warnings for *all* upstream crates, not just the local ones.

* When the `-vv` flag is passed Cargo will stream the output of all build scripts to the console, allowing more easy debugging of what happened if the build fails later on.

More details can be found in each commit, and otherwise this

Closes #1106

Author: bors

Cargo.lock

@@ -33,6 +33,7 @@ glob = "0.2"
 kernel32-sys = "0.2"
 libc = "0.2"
 log = "0.3"
+miow = "0.1"
 num_cpus = "0.2"
 regex = "0.1"
 rustc-serialize = "0.3"

Cargo.toml

@@ -11,7 +11,7 @@ pub struct Options {
     flag_no_default_features: bool,
     flag_target: Option<String>,
     flag_manifest_path: Option<String>,
-    flag_verbose: Option<bool>,
+    flag_verbose: u32,
     flag_quiet: Option<bool>,
     flag_color: Option<String>,
     flag_lib: bool,
@@ -42,7 +42,7 @@ Options:
     --no-default-features        Do not build the `default` feature
     --target TRIPLE              Build for the target triple
     --manifest-path PATH         Path to the manifest to build benchmarks for
-    -v, --verbose                Use verbose output
+    -v, --verbose ...            Use verbose output
     -q, --quiet                  No output printed to stdout
     --color WHEN                 Coloring: auto, always, never
 

src/bin/bench.rs

@@ -13,7 +13,7 @@ pub struct Options {
     flag_no_default_features: bool,
     flag_target: Option<String>,
     flag_manifest_path: Option<String>,
-    flag_verbose: Option<bool>,
+    flag_verbose: u32,
     flag_quiet: Option<bool>,
     flag_color: Option<String>,
     flag_release: bool,
@@ -44,7 +44,7 @@ Options:
     --no-default-features        Do not build the `default` feature
     --target TRIPLE              Build for the target triple
     --manifest-path PATH         Path to the manifest to compile
-    -v, --verbose                Use verbose output
+    -v, --verbose ...            Use verbose output
     -q, --quiet                  No output printed to stdout
     --color WHEN                 Coloring: auto, always, never
 

src/bin/build.rs

@@ -21,7 +21,7 @@ use cargo::util::process_builder::process;
 pub struct Flags {
     flag_list: bool,
     flag_version: bool,
-    flag_verbose: Option<bool>,
+    flag_verbose: u32,
     flag_quiet: Option<bool>,
     flag_color: Option<String>,
     flag_explain: Option<String>,
@@ -41,7 +41,7 @@ Options:
     -V, --version       Print version info and exit
     --list              List installed commands
     --explain CODE      Run `rustc --explain CODE`
-    -v, --verbose       Use verbose output
+    -v, --verbose ...   Use verbose output
     -q, --quiet         No output printed to stdout
     --color WHEN        Coloring: auto, always, never
 

src/bin/cargo.rs

@@ -9,7 +9,7 @@ pub struct Options {
     flag_package: Vec<String>,
     flag_target: Option<String>,
     flag_manifest_path: Option<String>,
-    flag_verbose: Option<bool>,
+    flag_verbose: u32,
     flag_quiet: Option<bool>,
     flag_color: Option<String>,
     flag_release: bool,
@@ -27,7 +27,7 @@ Options:
     --manifest-path PATH         Path to the manifest to the package to clean
     --target TRIPLE              Target triple to clean output for (default all)
     --release                    Whether or not to clean release artifacts
-    -v, --verbose                Use verbose output
+    -v, --verbose ...            Use verbose output
     -q, --quiet                  No output printed to stdout
     --color WHEN                 Coloring: auto, always, never
 

src/bin/clean.rs

@@ -12,7 +12,7 @@ pub struct Options {
     flag_no_deps: bool,
     flag_open: bool,
     flag_release: bool,
-    flag_verbose: Option<bool>,
+    flag_verbose: u32,
     flag_quiet: Option<bool>,
     flag_color: Option<String>,
     flag_package: Vec<String>,
@@ -39,7 +39,7 @@ Options:
     --no-default-features        Do not build the `default` feature
     --target TRIPLE              Build for the target triple
     --manifest-path PATH         Path to the manifest to document
-    -v, --verbose                Use verbose output
+    -v, --verbose ...            Use verbose output
     -q, --quiet                  No output printed to stdout
     --color WHEN                 Coloring: auto, always, never
 

src/bin/doc.rs

@@ -5,7 +5,7 @@ use cargo::util::important_paths::find_root_manifest_for_wd;
 #[derive(RustcDecodable)]
 pub struct Options {
     flag_manifest_path: Option<String>,
-    flag_verbose: Option<bool>,
+    flag_verbose: u32,
     flag_quiet: Option<bool>,
     flag_color: Option<String>,
 }
@@ -19,7 +19,7 @@ Usage:
 Options:
     -h, --help               Print this message
     --manifest-path PATH     Path to the manifest to fetch dependencies for
-    -v, --verbose            Use verbose output
+    -v, --verbose ...        Use verbose output
     -q, --quiet              No output printed to stdout
     --color WHEN             Coloring: auto, always, never
 

src/bin/fetch.rs

@@ -7,7 +7,7 @@ use cargo::util::important_paths::find_root_manifest_for_wd;
 #[derive(RustcDecodable)]
 pub struct Options {
     flag_manifest_path: Option<String>,
-    flag_verbose: Option<bool>,
+    flag_verbose: u32,
     flag_quiet: Option<bool>,
     flag_color: Option<String>,
 }
@@ -21,7 +21,7 @@ Usage:
 Options:
     -h, --help               Print this message
     --manifest-path PATH     Path to the manifest to generate a lockfile for
-    -v, --verbose            Use verbose output
+    -v, --verbose ...        Use verbose output
     -q, --quiet              No output printed to stdout
     --color WHEN             Coloring: auto, always, never
 ";

src/bin/generate_lockfile.rs

@@ -6,7 +6,7 @@ use cargo::util::{Config, CliResult, CliError, human, ToUrl};
 pub struct Options {
     flag_url: String,
     flag_reference: String,
-    flag_verbose: Option<bool>,
+    flag_verbose: u32,
     flag_quiet: Option<bool>,
     flag_color: Option<String>,
 }
@@ -20,7 +20,7 @@ Usage:
 
 Options:
     -h, --help               Print this message
-    -v, --verbose            Use verbose output
+    -v, --verbose ...        Use verbose output
     -q, --quiet              No output printed to stdout
     --color WHEN             Coloring: auto, always, never
 ";