travis: remove GCC toolchain, download prebuilt user image from github release

Author: wangrunji0408

.travis.yml

@@ -1,6 +1,6 @@
 sudo: false
 
-dist: xenial
+dist: bionic
 
 language: rust
 
@@ -40,29 +40,14 @@ install:
       sudo apt update;
       sudo apt install device-tree-compiler -y;
     fi
-  - if [ 1 ]; then
-    [ $ARCH = riscv32 ] && export FILE="riscv32-linux-musl-cross";
-    [ $ARCH = riscv64 ] && export FILE="riscv64-linux-musl-cross";
-    [ $ARCH = mipsel  ] && export FILE="mipsel-linux-musln32-cross";
-    [ $ARCH = aarch64 ] && export FILE="aarch64-linux-musl-cross";
-    [ $ARCH = x86_64  ] && export FILE="x86_64-linux-musl-cross";
-    if [ $TRAVIS_OS_NAME = linux ]; then
-    wget https://musl.cc/$FILE.tgz;
-    elif [ $TRAVIS_OS_NAME = osx ]; then
-    wget https://mac.musl.cc/$FILE.tgz;
-    fi;
-    tar -xf $FILE.tgz;
-    export PATH=$PATH:$PWD/$FILE/bin;
-    fi
-
 
 before_script:
   - rustup component add rust-src llvm-tools-preview
   - (test -x $HOME/.cargo/bin/cargo-objdump || cargo install cargo-binutils)
   - (test -x $HOME/.cargo/bin/cargo-xbuild || cargo install cargo-xbuild)
 
 script:
-  - cd user && make sfsimg arch=$ARCH && cd ..
+  - cd user && make sfsimg arch=$ARCH prebuilt=1 && cd ..
   - cd kernel && make build arch=$ARCH $OPTS && cd ..
   - if [ $ARCH = riscv32 ]; then
         cd tests && ./test.sh && cd ..;

kernel/Makefile

@@ -257,10 +257,10 @@ runtest: build justruntest
 justrun:
 	@qemu-system-$(arch) $(qemu_opts)
 
-justrunnet: build
+justrunnet:
 	@sudo qemu-system-$(arch) $(qemu_opts) $(qemu_net_opts)
 
-justruntest: build
+justruntest:
 	@qemu-system-$(arch) $(filter-out -serial mon:stdio, $(qemu_opts)) --append $(init) -serial file:../tests/stdout -monitor null
 
 debug: $(kernel) $(kernel_img)