Revert riscv removal.

Dockerfile.riscv

@@ -0,0 +1,23 @@
+# 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.
+RUN git clone https://review.gerrithub.io/riscv/riscv-go /riscv-go
+# riscvdev branch HEAD as of 2019-06-29.
+RUN cd /riscv-go && git checkout 04885fddd096d09d4450726064d06dd107e374bf
+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
+
+# 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 . .
+
+# Build the lib.
+RUN go build

test_crosscompile.sh

@@ -45,6 +45,10 @@ if ! hash docker; then
   return
 fi
 
+echo2 "Build for linux."
+echo2 "  - linux/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"
@@ -53,6 +57,7 @@ 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"