Update cross compile test for go1.16

Dockerfile.golang

@@ -0,0 +1,17 @@
+ARG GOVERSION=1.14
+FROM golang:${GOVERSION}
+
+# Set base env.
+ARG GOOS=linux
+ARG GOARCH=amd64
+ENV GOOS=${GOOS} GOARCH=${GOARCH} CGO_ENABLED=0 GOFLAGS='-v -ldflags=-s -ldflags=-w'
+
+# Pre compile the stdlib for 386/arm (32bits).
+RUN go build -a std
+
+# Add the code to the image.
+WORKDIR pty
+ADD . .
+
+# Build the lib.
+RUN go build

Dockerfile.riscv

@@ -1,3 +1,4 @@
+# NOTE: Using 1.13 as a base to build the RISCV compiler, the resulting version is based on go1.6.
 FROM golang:1.13
 
 # Clone and complie a riscv compatible version of the go compiler.
@@ -8,7 +9,15 @@ ENV PATH=/riscv-go/misc/riscv:/riscv-go/bin:$PATH
 RUN cd /riscv-go/src && GOROOT_BOOTSTRAP=$(go env GOROOT) ./make.bash
 ENV GOROOT=/riscv-go
 
-# Make sure we compile.
+# Set the base env.
+ENV GOOS=linux GOARCH=riscv CGO_ENABLED=0 GOFLAGS='-v -ldflags=-s -ldflags=-w'
+
+# Pre compile the stdlib.
+RUN go build -a std
+
+# Add the code to the image.
 WORKDIR pty
 ADD . .
-RUN GOOS=linux GOARCH=riscv go build
+
+# Build the lib.
+RUN go build

doc.go

@@ -10,7 +10,7 @@ import (
 // available on the current platform.
 var ErrUnsupported = errors.New("unsupported")
 
-// Opens a pty and its corresponding tty.
+// Open a pty and its corresponding tty.
 func Open() (pty, tty *os.File, err error) {
 	return open()
 }

test_crosscompile.sh

@@ -17,8 +17,8 @@ cross() {
     shift
     echo2 "Build for $os."
     for arch in $@; do
-	echo2 "  - $os/$arch"
-	GOOS=$os GOARCH=$arch go build
+      echo2 "  - $os/$arch"
+      GOOS=$os GOARCH=$arch go build
     done
     echo2
 }
@@ -26,7 +26,7 @@ cross() {
 set -e
 
 cross linux     amd64 386 arm arm64 ppc64 ppc64le s390x mips mipsle mips64 mips64le
-cross darwin    amd64 386 arm arm64
+cross darwin    amd64 arm64
 cross freebsd   amd64 386 arm
 cross netbsd    amd64 386 arm
 cross openbsd   amd64 386 arm arm64
@@ -47,4 +47,18 @@ fi
 
 echo2 "Build for linux."
 echo2 "  - linux/riscv"
-docker build -t test -f Dockerfile.riscv .
+docker build -t creack-pty-test -f Dockerfile.riscv .
+
+# Golang dropped support for darwin 32bits since go1.15. Make sure the lib still compile with go1.14 on those archs.
+echo2 "Build for darwin (32bits)."
+echo2 "  - darwin/386"
+docker build -t creack-pty-test -f Dockerfile.golang --build-arg=GOVERSION=1.14 --build-arg=GOOS=darwin --build-arg=GOARCH=386 .
+echo2 "  - darwin/arm"
+docker build -t creack-pty-test -f Dockerfile.golang --build-arg=GOVERSION=1.14 --build-arg=GOOS=darwin --build-arg=GOARCH=arm .
+
+# Run a single test for an old go version. Would be best with go1.0, but not available on Dockerhub.
+# Using 1.6 as it is the base version for the RISCV compiler.
+# Would also be better to run all the tests, not just one, need to refactor this file to allow for specifc archs per version.
+echo2 "Build for linux - go1.6."
+echo2 "  - linux/amd64"
+docker build -t creack-pty-test -f Dockerfile.golang --build-arg=GOVERSION=1.6 --build-arg=GOOS=linux --build-arg=GOARCH=amd64 .