Add musl builds.

.github/travis/before-install.sh

@@ -9,4 +9,9 @@ if [ "$TRAVIS_OS_NAME" = "linux" ]; then
 				pkg-config \
 				libutempter-dev \
 				build-essential
+
+	if [ "$BUILD" = "musl" ]; then
+		sudo apt-get -y install musl-dev \
+					musl-tools
+	fi
 fi

.github/travis/build.sh

@@ -10,6 +10,14 @@ case "$BUILD" in
 		sh $(dirname $0)/build-all.sh
 		exec make
 		;;
+	musl)
+		CC=musl-gcc sh $(dirname $0)/build-all.sh
+		exec make
+		;;
+	musl-static)
+		CC=musl-gcc sh $(dirname $0)/build-all.sh --enable-static
+		exec make
+		;;
 	*)
 		./configure || exit 1
 		exec make

.travis.yml

@@ -16,15 +16,32 @@ env:
   - BUILD=
   - BUILD=static
   - BUILD=all
+  - BUILD=musl
+  - BUILD=musl-static
 
 jobs:
   exclude:
+    # Static builds are broken on OS X (by Apple)
     - os: osx
       compiler: gcc
       env: BUILD=static
     - os: osx
       compiler: clang
       env: BUILD=static
+    # No musl on OS X
+    - os: osx
+      compiler: gcc
+      env: BUILD=musl
+    - os: osx
+      compiler: clang
+      env: BUILD=musl
+    - os: osx
+      compiler: gcc
+      env: BUILD=musl-static
+    - os: osx
+      compiler: clang
+      env: BUILD=musl-static
+    # arm64 doesn't link ncurses
     - os: linux
       compiler: gcc
       arch: arm64
@@ -33,6 +50,22 @@ jobs:
       compiler: clang
       arch: arm64
       env: BUILD=all
+    - os: linux
+      compiler: gcc
+      arch: arm64
+      env: BUILD=musl
+    - os: linux
+      compiler: clang
+      arch: arm64
+      env: BUILD=musl
+    - os: linux
+      compiler: gcc
+      arch: arm64
+      env: BUILD=musl-static
+    - os: linux
+      compiler: clang
+      arch: arm64
+      env: BUILD=musl-static
 
 before_install:
   - sh .github/travis/before-install.sh