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CROSS-COMPILE.md

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Instructions for cross-compiling

Ghostunnel has support for loading private keys from PKCS#11 modules, which should work with any hardware security module that exposes a PKCS#11 interface. A working CGO toolchain is required in order to compile with PKCS#11 support enabled.

One way to cross-compile ghostunnel is with karalabe/xgo. Note that libtool is a required build dependency, and libltdl needs to be available at runtime. You can build a static binary to avoid the libltdl runtime dependency by passing appropriate ldflags to the compiler.

For example, to build a static 64-bit Windows binary:

xgo \
  -deps https://ftp.gnu.org/pub/gnu/libtool/libtool-2.4.6.tar.gz \
  -branch master \
  -targets 'windows/amd64' \
  -ldflags '-w -extldflags "-static" -extld x86_64-w64-mingw32-gcc' \
  github.com/square/ghostunnel

Ghostunnel ships with a Makefile.dist that will cross-compile for darwin/amd64, linux/amd64, windows/386 and windows/amd64 when asked to build the dist target. Note that xgo (and Docker) must already be installed to run this. For more info, see also xgo's README on GitHub.