From 6ffed384620b55a59442dfd1003b546220f6059f Mon Sep 17 00:00:00 2001
From: asandikci <git@aliberksandikci.com.tr>
Date: Wed, 30 Aug 2023 21:14:10 +0300
Subject: [PATCH] Initial Commit

---
 README.md                   | 40 +++++++++++++++++++++++++++++++++++++
 cmd/app/main.go             | 15 ++++++++++++++
 go.mod                      |  3 +++
 pkg/mypkg/main.go           |  5 +++++
 pkg/mypkg/symbol_linux.go   |  7 +++++++
 pkg/mypkg/symbol_windows.go |  7 +++++++
 6 files changed, 77 insertions(+)
 create mode 100644 README.md
 create mode 100644 cmd/app/main.go
 create mode 100644 go.mod
 create mode 100644 pkg/mypkg/main.go
 create mode 100644 pkg/mypkg/symbol_linux.go
 create mode 100644 pkg/mypkg/symbol_windows.go

diff --git a/README.md b/README.md
new file mode 100644
index 0000000..4cce51a
--- /dev/null
+++ b/README.md
@@ -0,0 +1,40 @@
+# Go Crosscompile
+
+# Explanation
+symbol() function in pkg/mypkg/symbol_linux.go and symbol_windows.go is different. When running and building program, GOOS choses right one. for more information run these in cmd/app/ directory: 
+```sh
+  go build .
+  ./app
+  # Output:
+  #1+2=linux
+  #a/b/c
+```
+
+---
+
+```sh
+  env GOOS=windows GOARCH=amd64 go build .
+  ./app.exe
+  # Output:
+  # -Some random wine logs if running on linux with wine-
+  #1-2=windows
+  #a\b\c 
+```
+---
+```sh
+  file app*
+  # see information about executables
+```
+# HELP NEEDED
+VSCode gives redecleration error when using same name as function names. How to solve this?
+maybe see https://github.com/golang/go/issues/29202 ?
+
+# Before trying
+- make sure you have installed **wine** in your linux system
+  - or use a windows system too 
+
+# Resources
+- https://www.digitalocean.com/community/tutorials/customizing-go-binaries-with-build-tags
+- https://www.digitalocean.com/community/tutorials/building-go-applications-for-different-operating-systems-and-architectures
+- https://www.digitalocean.com/community/tutorials/how-to-build-go-executables-for-multiple-platforms-on-ubuntu-20-04
+- https://opensource.com/article/21/1/go-cross-compiling
diff --git a/cmd/app/main.go b/cmd/app/main.go
new file mode 100644
index 0000000..3e8607f
--- /dev/null
+++ b/cmd/app/main.go
@@ -0,0 +1,15 @@
+package main
+
+import (
+	"fmt"
+	"path/filepath"
+
+	"git.aliberksandikci.com.tr/asandikci/go-crosscompile/pkg/mypkg"
+)
+
+func main() {
+	s := filepath.Join("a", "b", "c")
+	fmt.Println(mypkg.Symbol("1", "2"))
+
+	fmt.Println(s)
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..bd4eb54
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module git.aliberksandikci.com.tr/asandikci/go-crosscompile
+
+go 1.21.0
diff --git a/pkg/mypkg/main.go b/pkg/mypkg/main.go
new file mode 100644
index 0000000..24e6f2e
--- /dev/null
+++ b/pkg/mypkg/main.go
@@ -0,0 +1,5 @@
+package mypkg
+
+func Symbol(a, b string) string {
+	return symbol(a, b)
+}
diff --git a/pkg/mypkg/symbol_linux.go b/pkg/mypkg/symbol_linux.go
new file mode 100644
index 0000000..8f64d8f
--- /dev/null
+++ b/pkg/mypkg/symbol_linux.go
@@ -0,0 +1,7 @@
+// go:build linux
+
+package mypkg
+
+func symbol(a, b string) string {
+	return a + "+" + b + "=linux"
+}
diff --git a/pkg/mypkg/symbol_windows.go b/pkg/mypkg/symbol_windows.go
new file mode 100644
index 0000000..391d262
--- /dev/null
+++ b/pkg/mypkg/symbol_windows.go
@@ -0,0 +1,7 @@
+// go:build windows
+
+package mypkg
+
+func symbol(a, b string) string {
+	return a + "-" + b + "=windows"
+}