go: Add go.mod and modules support

README.md

@@ -23,7 +23,7 @@ Please visit the [documentation].
 | ----------------------------- | --------------------- | ------------------------------ | -------------------
 | **C**                         | C99, C11              | GCC 6+, clang 3.8+, MSVC 2015+ | Host- and VM-side
 | **C++**                       | C++11, C++14, C++17   | GCC 6+, clang 3.8+, MSVC 2015+ | Host- and VM-side
-| **Go** _(bindings)_           | 1.9 - 1.12            |                                | Host-side only
+| **Go** _(bindings)_           | 1.11 - 1.14 (modules) |                                | Host-side only
 | **Rust** _(bindings)_[¹](#n1) | 2018 edition          | 1.37.0 and newer               | VM-side only
 | **Java** _(bindings)_         | 11                    |                                | Host-side only
 

bindings/go/evmc/evmc.go

@@ -5,7 +5,7 @@
 package evmc
 
 /*
-#cgo CFLAGS:  -I${SRCDIR}/.. -Wall -Wextra
+#cgo CFLAGS: -I${SRCDIR}/../../../include -Wall -Wextra
 #cgo !windows LDFLAGS: -ldl
 
 #include <evmc/evmc.h>

bindings/go/evmc/host.go

@@ -5,7 +5,7 @@
 package evmc
 
 /*
-#cgo CFLAGS:  -I${SRCDIR}/.. -Wall -Wextra -Wno-unused-parameter
+#cgo CFLAGS: -I${SRCDIR}/../../../include -Wall -Wextra -Wno-unused-parameter
 
 #include <evmc/evmc.h>
 #include <evmc/helpers.h>

bindings/go/evmc/loader.c

@@ -0,0 +1,4 @@
+/* Include evmc::loader in the Go package.
+ * The "go build" builds all additional C/C++ files in the Go package directory,
+ * but symbolic links are ignored so #include is used instead. */
+#include "../../../lib/loader/loader.c"

go.mod

@@ -0,0 +1,3 @@
+module github.com/ethereum/evmc/v7
+
+go 1.11