initial pass at musllinux support

common_utils.sh

@@ -35,6 +35,9 @@ else
   which python || export PATH=/opt/python/cp39-cp39/bin:$PATH
 fi
 
+if [ $MB_ML_LIBC == "musllinux" ]; then
+  IS_ALPINE=1;
+fi
 
 # Work round bug in travis xcode image described at
 # https://github.com/direnv/direnv/issues/210
@@ -220,6 +223,8 @@ function install_rsync {
     if [ -n "$IS_MACOS" ]; then
         # macOS. The colon in the next line is the null command
         :
+    elif [ -n "$IS_ALPINE" ]; then
+        [[ $(type -P rsync) ]] || apk add rsync
     elif [[ $MB_ML_VER == "_2_24" ]]; then
         # debian:9 based distro
         [[ $(type -P rsync) ]] || apt-get install -y rsync
@@ -308,6 +313,7 @@ function build_wheel_cmd {
     local repo_dir=${2:-$REPO_DIR}
     [ -z "$repo_dir" ] && echo "repo_dir not defined" && exit 1
     local wheelhouse=$(abspath ${WHEEL_SDIR:-wheelhouse})
+    mkdir -p "$wheelhouse"
     start_spinner
     if [ -n "$(is_function "pre_build")" ]; then pre_build; fi
     stop_spinner

library_builders.sh

@@ -133,7 +133,9 @@ function build_zlib {
     # Gives an old but safe version
     if [ -n "$IS_MACOS" ]; then return; fi  # OSX has zlib already
     if [ -e zlib-stamp ]; then return; fi
-    if [[ $MB_ML_VER == "_2_24" ]]; then
+    if [ -n "$IS_ALPINE" ]; then
+        apk add zlib-dev
+    elif [[ $MB_ML_VER == "_2_24" ]]; then
         # debian:9 based distro
         apt-get install -y zlib1g-dev
     else
@@ -186,6 +188,8 @@ function get_modern_cmake {
     local cmake=cmake
     if [ -n "$IS_MACOS" ]; then
         brew install cmake > /dev/null
+    elif [ -n "$IS_ALPINE" ]; then
+        apk add cmake
     elif [[ $MB_ML_VER == "_2_24" ]]; then
         # debian:9 based distro
         apt-get install -y cmake
@@ -411,6 +415,8 @@ function build_suitesparse {
     if [ -e suitesparse-stamp ]; then return; fi
     if [ -n "$IS_MACOS" ]; then
         brew install suite-sparse > /dev/null
+    elif [ -n "$IS_ALPINE" ]; then
+        apk add suitesparse-dev 
     elif [[ $MB_ML_VER == "_2_24" ]]; then
         # debian:9 based distro
         apt-get install -y libsuitesparse-dev > /dev/null

manylinux_utils.sh

@@ -44,24 +44,29 @@ function activate_ccache {
     ln -s /parent-home/.ccache $HOME/.ccache
 
     # Now install ccache
-    if [[ $MB_ML_VER == "_2_24" ]]; then
-        # debian:9 based distro
-        suppress apt-get install -y ccache
+    if [ -n "$IS_ALPINE" ]; then 
+        supress apk add ccache
+        export PATH="/usr/lib/ccache/bin:$PATH"
     else
-        # centos based distro
-        suppress yum_install ccache
-    fi
+        if [[ $MB_ML_VER == "_2_24" ]]; then
+            # debian:9 based distro
+            suppress apt-get install -y ccache
+        else
+            # centos based distro
+            suppress yum_install ccache
+        fi
 
-    # Create fake compilers and prepend them to the PATH
-    # Note that yum is supposed to create these for us,
-    # but I had trouble finding them
-    local ccache_dir=/usr/lib/ccache/compilers
-    mkdir -p $ccache_dir
-    ln -s /usr/bin/ccache $ccache_dir/gcc
-    ln -s /usr/bin/ccache $ccache_dir/g++
-    ln -s /usr/bin/ccache $ccache_dir/cc
-    ln -s /usr/bin/ccache $ccache_dir/c++
-    export PATH=$ccache_dir:$PATH
+        # Create fake compilers and prepend them to the PATH
+        # Note that yum is supposed to create these for us,
+        # but I had trouble finding them
+        local ccache_dir=/usr/lib/ccache/compilers
+        mkdir -p $ccache_dir
+        ln -s /usr/bin/ccache $ccache_dir/gcc
+        ln -s /usr/bin/ccache $ccache_dir/g++
+        ln -s /usr/bin/ccache $ccache_dir/cc
+        ln -s /usr/bin/ccache $ccache_dir/c++
+        export PATH=$ccache_dir:$PATH
+    fi
 
     # Prove to the developer that ccache is activated
     echo "Using C compiler: $(which gcc)"

travis_linux_steps.sh

@@ -69,6 +69,7 @@ function build_multilinux {
     # Depends on
     #     MB_PYTHON_VERSION
     #     MB_ML_VER
+    #     MB_ML_LIBC (optional)
     #     UNICODE_WIDTH (optional)
     #     BUILD_DEPENDS (optional)
     #     DOCKER_IMAGE (optional)
@@ -77,7 +78,8 @@ function build_multilinux {
     local plat=$1
     [ -z "$plat" ] && echo "plat not defined" && exit 1
     local build_cmds="$2"
-    local docker_image=${DOCKER_IMAGE:-quay.io/pypa/manylinux${MB_ML_VER}_\$plat}
+    local libc=${MB_ML_LIBC:-manylinux}
+    local docker_image=${DOCKER_IMAGE:-quay.io/pypa/${libc}${MB_ML_VER}_\$plat}
     docker_image=$(eval echo "$docker_image")
     retry docker pull $docker_image
     docker run --rm \
@@ -95,6 +97,7 @@ function build_multilinux {
         -e REPO_DIR="$repo_dir" \
         -e PLAT="$PLAT" \
         -e MB_ML_VER="$MB_ML_VER" \
+        -e MB_ML_LIBC="$libc" \
         -v $PWD:/io \
         -v $HOME:/parent-home \
         $docker_image /io/$MULTIBUILD_DIR/docker_build_wrap.sh