Support MIPS architectures

lld doesn't work with readonly .eh_frame sections on MIPS, see
https://reviews.llvm.org/D13104.

.travis.yml

@@ -19,6 +19,30 @@ matrix:
       os: linux
       dist: bionic
       env: EXTRA_FLAGS='target_cpu="arm"'
+    - name: "linux-mips64el"
+      os: linux
+      dist: bionic
+      env: EXTRA_FLAGS='target_cpu="mips64el" use_lld=false'
+      addons:
+        apt:
+          packages:
+            - ninja-build
+            - pkg-config
+            - libnss3-dev
+            - qemu-user
+            - binutils-mips64el-linux-gnuabi64
+    - name: "linux-mipsel"
+      os: linux
+      dist: bionic
+      env: EXTRA_FLAGS='target_cpu="mipsel" mips_arch_variant="r2" use_lld=false'
+      addons:
+        apt:
+          packages:
+            - ninja-build
+            - pkg-config
+            - libnss3-dev
+            - qemu-user
+            - binutils-mipsel-linux-gnu
     - name: "osx"
       os: osx
       osx_image: xcode10.2

src/build/linux/sysroot_scripts/sysroot-creator-sid-naive.sh

@@ -45,16 +45,20 @@ DEBIAN_PACKAGES_ARM64='
   libitm1
   libubsan0
 '
+DEBIAN_PACKAGES_MIPS64EL='
+'
 
 # Disables libdbus workarounds
 ln -sf /bin/true strip
 ln -sf /bin/true arm-linux-gnueabihf-strip
+ln -sf /bin/true mipsel-linux-gnu-strip
+ln -sf /bin/true mips64el-linux-gnuabi64-strip
 export PATH="$PWD:$PATH"
 cp() {
   [ "${1##*/}" = libdbus-1-3-symbols ] && return
   /bin/cp "$@"
 }
 
-trap "cd $PWD; rm strip arm-linux-gnueabihf-strip" EXIT
+trap "cd $PWD; rm strip *-strip" EXIT
 
 . "${SCRIPT_DIR}/sysroot-creator.sh"

src/get-clang.sh

@@ -30,6 +30,12 @@ if [ "$ARCH" = Linux ]; then
     x86)
       build_sysroot I386
     ;;
+    mips64el)
+      build_sysroot Mips64el
+    ;;
+    mipsel)
+      build_sysroot I386
+      build_sysroot Mips
   esac
 fi
 

tests/basic.sh

@@ -8,6 +8,8 @@ if [ "$(uname)" = Linux ]; then
     arm64) naive="qemu-aarch64 -L src/build/linux/debian_sid_arm64-sysroot $naive";;
     arm) naive="qemu-arm -L src/build/linux/debian_sid_arm-sysroot $naive";;
     x86) naive="qemu-i386 -L src/build/linux/debian_sid_i386-sysroot $naive";;
+    mipsel) naive="qemu-mipsel -L src/build/linux/debian_sid_mips-sysroot $naive";;
+    mips64el) naive="qemu-mips64el -L src/build/linux/debian_sid_mips64el-sysroot $naive";;
   esac
 fi