build: Added build handy tools

Added bin folder to gitignore, added Makefile for building.

Author: lopezator

.gitignore

@@ -1 +1,2 @@
+bin/
 .idea/

Makefile

@@ -0,0 +1,74 @@
+# MAINTAINER: David López <d.lopez@saltosystems.com>
+
+APP    =  sqlfmt
+OS     =  amd64-linux-gnu amd64-linux-musl amd64-darwin amd64-windows
+SHELL  := /bin/bash
+
+# Overridable by CI
+COMMIT_SHORT     ?= $(shell git rev-parse --verify --short HEAD)
+VERSION          ?= $(COMMIT_SHORT)
+VERSION_NOPREFIX ?= $(shell echo $(VERSION) | sed -e 's/^[[v]]*//')
+
+# Build vars
+CGO_ENABLED = 1
+GOOS :=
+GOARCH :=
+CC :=
+CXX :=
+LDFLAGS :=
+EXTRA_CMAKE_FLAGS :=
+SUFFIX :=
+EXT :=
+
+#
+# Common methodology based targets
+#
+.PHONY: build
+build:
+	@for app in $(APP) ; do \
+		for os in $(OS) ; do \
+			if [ "$$os" == "amd64-linux-gnu" ]; then \
+				GOOS=linux; \
+				GOARCH=amd64; \
+				CC=x86_64-unknown-linux-gnu-cc; \
+				CXX=x86_64-unknown-linux-gnu-c++; \
+				LDFLAGS="-static-libgcc -static-libstdc++"; \
+				SUFFIX=-linux-2.6.32-gnu-amd64; \
+			fi; \
+			if [ "$$os" == "amd64-linux-musl" ]; then \
+				GOOS=linux; \
+				GOARCH=amd64; \
+				CC=x86_64-unknown-linux-musl-cc; \
+				CXX=x86_64-unknown-linux-musl-c++; \
+				LDFLAGS=-static; \
+				SUFFIX=-linux-2.6.32-musl-amd64; \
+			fi; \
+			if [ "$$os" == "amd64-darwin" ]; then \
+				echo "entra"; \
+				GOOS=darwin; \
+				GOARCH=amd64; \
+				CC=x86_64-apple-darwin13-cc; \
+				CXX=x86_64-apple-darwin13-c++; \
+				EXTRA_CMAKE_FLAGS=-DCMAKE_INSTALL_NAME_TOOL=x86_64-apple-darwin13-install_name_tool; \
+				SUFFIX=-darwin-10.9-amd64; \
+			fi; \
+			if [ "$$os" == "amd64-windows" ]; then \
+				EXT=".exe"; \
+				GOOS=windows; \
+				GOARCH=amd64; \
+				CC=x86_64-w64-mingw32-cc; \
+				CXX=x86_64-w64-mingw32-c++; \
+				LDFLAGS=-static; \
+				SUFFIX=-windows-6.2-amd64; \
+			fi; \
+			CGO_ENABLED=$(CGO_ENABLED) GOOS=$$GOOS GOARCH=$$GOARCH \
+			CC=$$CC CXX=$$CXX EXTRA_CMAKE_FLAGS=$$EXTRA_CMAKE_FLAGS SUFFIX=$$SUFFIX \
+			go build \
+				-a -x -v -ldflags "$(LDFLAGS)  \
+					-X main.Version=$(VERSION_NOPREFIX) \
+					-X main.GitRev=$(COMMIT_SHORT) \
+				" \
+				-o ./bin/$$app-$(VERSION_NOPREFIX)-$$os$$EXT \
+				./cmd/$$app; \
+		done; \
+	done;

README.md

@@ -73,4 +73,27 @@ Flags:
 
     ```
     Error: syntax error at or near "fron"
+    ```
+
+## Build cross-platform binaries from source
+
+Each release comes with pre-compiled binaries for several platforms:
+
+https://github.com/lopezator/sqlfmt/releases
+
+Anyway, if you want to cross-compile from source, you can do it using docker in a handy way:
+
+1. Build container:
+    ```
+    $> docker run --rm -t -d --name="sqlfmt-builder" -v="$PWD:/go/src/github.com/lopezator/sqlfmt" --workdir="/go/src/github.com/lopezator/sqlfmt" --entrypoint="cat" cockroachdb/builder:20180813-101406
+    ```
+
+2. Build binaries inside the container:
+    ```
+    $> docker exec -it sqlfmt-builder make build
+    ```
+
+3. Stop container:
+    ```
+    $> docker container stop sqlfmt-builder
     ```