Inject (cross-)compiling flags

[jonahbeckford]

This is an implementation of the cross-compiling design at #129 . It ended up being more complicated because I forgot that the include directories (-I/usr/include) in addition to the libraries (-L/usr/lib -luv) needed modifications.

Testing

Pending testing on Windows; only macOS has been tested

Native compiling on macOS

brew install libuv # 1.43.0
dune clean
unset LUV_USE_SYSTEM_LIBUV LUV_INCLUDE_LIBUV_DEFAULT LUV_LIB_LIBUV_DEFAULT LUV_INCLUDE_LIBUV_DEFAULT_DARWIN_X86_64 LUV_LIB_LIBUV_DEFAULT_DARWIN_X86_64
export LUV_USE_SYSTEM_LIBUV=yes
export LUV_INCLUDE_LIBUV_DEFAULT='-I;/opt/homebrew/include'
export LUV_LIB_LIBUV_DEFAULT='-L/opt/homebrew/lib;-luv'

LUV_USE_SYSTEM_LIBUV=yes LUV_INCLUDE_LIBUV_DEFAULT='-I;/opt/homebrew/include' LUV_LIB_LIBUV_DEFAULT='-L/opt/homebrew/lib;-luv' make test

Failing tests after PR are:

  [FAIL]        version              1   minor.
  [FAIL]        version              5   hex.
  [FAIL]        version              6   version.
  [FAIL]        version              7   string.

  [FAIL]        tty                  0   tty.
  [FAIL]        tty                  1   handle functions.

  # This stalls on macOS (Apple Silicon) so disabled
  ...           udp                  7   multicast.

  # This does SIGABRT so disabled
                thread                   mutex.

Failing tests without LUV_USE_SYSTEM_LIBUV=yes:

  [FAIL]        version              1   minor.
  [FAIL]        version              5   hex.
  [FAIL]        version              6   version.
  [FAIL]        version              7   string.

  [FAIL]        tty                  0   tty.
  [FAIL]        tty                  1   handle functions.

  # These stall on macOS so disabled
  ...           udp                  7   multicast.
  ...           fs_event             2   create.

---

Cross-compiling on macos

Host=darwin_arm64 Target=darwin_x86_64

Using Duniverse Opam repository at https://github.com/dune-universe/opam-overlays
with one extra patch for ctypes.0.17.1+dune at avsm/ocaml-ctypes#4

dune clean
unset LUV_USE_SYSTEM_LIBUV LUV_INCLUDE_LIBUV_DEFAULT LUV_LIB_LIBUV_DEFAULT LUV_INCLUDE_LIBUV_DEFAULT_DARWIN_X86_64 LUV_LIB_LIBUV_DEFAULT_DARWIN_X86_64
export LUV_USE_SYSTEM_LIBUV=yes
export LUV_INCLUDE_LIBUV_DEFAULT='-I;/opt/homebrew/include'
export LUV_LIB_LIBUV_DEFAULT='-L/opt/homebrew/lib;-luv'
export LUV_INCLUDE_LIBUV_DEFAULT_DARWIN_X86_64="-I;/tmp/dckbuild/darwin_x86_64/vcpkg_installed/x64-osx/include"
export LUV_LIB_LIBUV_DEFAULT_DARWIN_X86_64="-L/tmp/dckbuild/darwin_x86_64/vcpkg_installed/x64-osx/lib;-luv"
dune build @install
dune build -x darwin_x86_64 @install

$ tail -n20 _build/*/src/c/config/compile_c.sh _build/*/src/c/config/uv_lib.sexp
==> _build/default.darwin_x86_64/src/c/config/compile_c.sh <==
#!/bin/sh
# context=default.darwin_x86_64
set -euf
src=$1; shift
ctypes=$1; shift
target=$1; shift
"$@" "$src" -I "$ctypes" -I "/tmp/dckbuild/darwin_x86_64/Debug/dksdk/ocaml/opt/mlcross/darwin_x86_64/lib/ocaml" "-I" "/tmp/dckbuild/darwin_x86_64/vcpkg_installed/x64-osx/include" -o "$target"

==> _build/default/src/c/config/compile_c.sh <==
#!/bin/sh
# context=default
set -euf
src=$1; shift
ctypes=$1; shift
target=$1; shift
"$@" "$src" -I "$ctypes" -I "/tmp/dckbuild/darwin_x86_64/Debug/dksdk/ocaml/lib/ocaml" "-I" "/opt/homebrew/include" -o "$target"

==> _build/default.darwin_x86_64/src/c/config/uv_lib.sexp <==
("-L/tmp/dckbuild/darwin_x86_64/vcpkg_installed/x64-osx/lib" "-luv")
==> _build/default/src/c/config/uv_lib.sexp <==
("-L/opt/homebrew/lib" "-luv")

$ file _build/install/*/lib/stublibs/dllluv_unix_stubs.so
_build/install/default.darwin_x86_64/lib/stublibs/dllluv_unix_stubs.so: Mach-O 64-bit dynamically linked shared library x86_64
_build/install/default/lib/stublibs/dllluv_unix_stubs.so:               Mach-O 64-bit dynamically linked shared library arm64

[jonahbeckford]

Native Windows compiling has been tested as well.