Explicitly set static crt

Author: liranringel

Cargo.toml

@@ -14,4 +14,4 @@ A build dependency for running `cmake` to build a native library
 """
 
 [dependencies]
-gcc = "0.3.17"
+gcc = "0.3.46"

src/lib.rs

@@ -72,6 +72,7 @@ pub struct Config {
     build_args: Vec<OsString>,
     cmake_target: Option<String>,
     env: Vec<(OsString, OsString)>,
+    static_crt: Option<bool>,
 }
 
 /// Builds the native library rooted at `path` with the default cmake options.
@@ -112,6 +113,7 @@ impl Config {
             build_args: Vec::new(),
             cmake_target: None,
             env: Vec::new(),
+            static_crt: None,
         }
     }
 
@@ -191,6 +193,14 @@ impl Config {
         self
     }
 
+    /// Configures whether the /MT flag or the /MD flag will be passed to msvc build tools.
+    ///
+    /// This option defaults to `false`, and affect only msvc targets.
+    pub fn static_crt(&mut self, static_crt: bool) -> &mut Config {
+        self.static_crt = Some(static_crt);
+        self
+    }
+
     /// Add an argument to the final `cmake` build step
     pub fn build_arg<A: AsRef<OsStr>>(&mut self, arg: A) -> &mut Config {
         self.build_args.push(arg.as_ref().to_owned());
@@ -232,13 +242,15 @@ impl Config {
                                          .debug(false)
                                          .target(&target)
                                          .host(&host)
+                                         .static_crt(self.static_crt.unwrap_or(false))
                                          .get_compiler();
         let cxx_compiler = gcc::Config::new().cargo_metadata(false)
                                          .cpp(true)
                                          .opt_level(0)
                                          .debug(false)
                                          .target(&target)
                                          .host(&host)
+                                         .static_crt(self.static_crt.unwrap_or(false))
                                          .get_compiler();
 
         let dst = self.out_dir.clone().unwrap_or_else(|| {