Separated cflags and command args

src/lib.rs

@@ -148,6 +148,7 @@ impl From<io::Error> for Error {
 #[derive(Clone, Debug)]
 pub struct Tool {
     path: PathBuf,
+    path_args: Vec<OsString>,
     args: Vec<OsString>,
     env: Vec<(OsString, OsString)>,
     family: ToolFamily
@@ -1285,7 +1286,7 @@ impl Build {
             .map(|(tool, args)| {
                 let mut t = Tool::new(PathBuf::from(tool));
                 for arg in args {
-                    t.args.push(arg.into());
+                    t.path_args.push(arg.into());
                 }
                 t
             })
@@ -1401,6 +1402,7 @@ impl Build {
             .collect()
     }
 
+
     fn env_tool(&self, name: &str) -> Option<(String, Vec<String>)> {
         self.get_var(name).ok().map(|tool| {
             let whitelist = ["ccache", "distcc", "sccache"];
@@ -1539,6 +1541,7 @@ impl Tool {
         };
         Tool {
             path: path,
+            path_args: Vec::new(),
             args: Vec::new(),
             env: Vec::new(),
             family: family
@@ -1552,6 +1555,7 @@ impl Tool {
     /// variables configured.
     pub fn to_command(&self) -> Command {
         let mut cmd = Command::new(&self.path);
+        cmd.args(&self.path_args);
         cmd.args(&self.args);
         for &(ref k, ref v) in self.env.iter() {
             cmd.env(k, v);
@@ -1580,6 +1584,32 @@ impl Tool {
     pub fn env(&self) -> &[(OsString, OsString)] {
         &self.env
     }
+
+    /// Returns the compiler command in format of CC environment variable.
+    /// 
+    /// This is typically used by configure script 
+    pub fn cc_env(&self) -> OsString {
+        let mut cc = self.path.as_os_str().to_owned();        
+        for arg in self.path_args.iter() {
+            cc.push(" ");
+            cc.push(arg);
+        }
+        cc
+    }
+
+    /// Returns the compiler flags in format of CFLAGS environment variable.
+    /// 
+    /// This is typically used by configure script 
+    pub fn cflags_env(&self) -> OsString {
+        let mut flags = OsString::new();
+        for (i, arg) in self.args.iter().enumerate() {
+            if i > 0 {
+                flags.push(" ");
+            }
+            flags.push(arg);
+        }
+        flags
+    }
 }
 
 fn run(cmd: &mut Command, program: &str) -> Result<(), Error> {

tests/cc_env.rs

@@ -11,6 +11,7 @@ fn main() {
     ccache();
     distcc();
     ccache_spaces();
+    ccache_env_flags();
 }
 
 fn ccache() {
@@ -47,3 +48,20 @@ fn distcc() {
         .must_have("foo.c")
         .must_not_have("distcc");
 }
+
+fn ccache_env_flags() {
+    use std::path::Path;
+    use std::ffi::OsString;
+
+    let test = Test::gnu();
+    test.shim("ccache");
+
+    env::set_var("CC", "ccache lol-this-is-not-a-compiler");
+    let compiler = test.gcc().file("foo.c").get_compiler();
+    assert_eq!(compiler.path(), Path::new("ccache"));
+    assert_eq!(compiler.cc_env(), OsString::from("ccache lol-this-is-not-a-compiler"));
+    assert!(compiler.cflags_env().into_string().unwrap().contains("ccache") == false);
+    assert!(compiler.cflags_env().into_string().unwrap().contains(" lol-this-is-not-a-compiler") == false);
+
+    env::set_var("CC", "");
+}