add musl-root support for mips targets

Author: smaeul

configure

@@ -486,6 +486,8 @@ valopt musl-root-i686 "" "i686-unknown-linux-musl install directory"
 valopt musl-root-arm "" "arm-unknown-linux-musleabi install directory"
 valopt musl-root-armhf "" "arm-unknown-linux-musleabihf install directory"
 valopt musl-root-armv7 "" "armv7-unknown-linux-musleabihf install directory"
+valopt musl-root-mips "" "mips-unknown-linux-musl install directory"
+valopt musl-root-mipsel "" "mipsel-unknown-linux-musl install directory"
 valopt extra-filename "" "Additional data that is hashed and passed to the -C extra-filename flag"
 valopt qemu-armhf-rootfs "" "rootfs in qemu testing, you probably don't want to use this"
 

src/bootstrap/config.rs

@@ -511,6 +511,18 @@ impl Config {
                                      .or_insert(Target::default());
                     target.musl_root = Some(parse_configure_path(value));
                 }
+                "CFG_MUSL_ROOT_MIPS" if value.len() > 0 => {
+                    let target = "mips-unknown-linux-musl".to_string();
+                    let target = self.target_config.entry(target)
+                                     .or_insert(Target::default());
+                    target.musl_root = Some(parse_configure_path(value));
+                }
+                "CFG_MUSL_ROOT_MIPSEL" if value.len() > 0 => {
+                    let target = "mipsel-unknown-linux-musl".to_string();
+                    let target = self.target_config.entry(target)
+                                     .or_insert(Target::default());
+                    target.musl_root = Some(parse_configure_path(value));
+                }
                 "CFG_DEFAULT_AR" if value.len() > 0 => {
                     self.rustc_default_ar = Some(value.to_string());
                 }

src/ci/docker/cross/Dockerfile

@@ -78,5 +78,7 @@ ENV RUST_CONFIGURE_ARGS \
       --target=$TARGETS \
       --musl-root-arm=/usr/local/arm-linux-musleabi \
       --musl-root-armhf=/usr/local/arm-linux-musleabihf \
-      --musl-root-armv7=/usr/local/armv7-linux-musleabihf
+      --musl-root-armv7=/usr/local/armv7-linux-musleabihf \
+      --musl-root-mips=/usr/local/mips-linux-musl \
+      --musl-root-mipsel=/usr/local/mipsel-linux-musl
 ENV SCRIPT python2.7 ../x.py dist --target $TARGETS