pkgs/development/ocaml-modules/ocaml-freestanding/no-opam.patch

   1 commit 637b7ce639d54e617170433aa9596176b167d085
   2 Author: sternenseemann <0rpkxez4ksa01gb3typccl0i@systemli.org>
   3 Date:   Thu Mar 18 01:07:49 2021 +0100
   4
   5     Allow building without ocamlfind and opam
   6
   7     This change is the result of my first go at packaging ocaml-freestanding
   8     for NixOS. Our build infrastructure for ocaml there is completely
   9     independent of opam at the moment, so depending on opam for the build
  10     time is not an option, especially in this case where the information it
  11     would give us would be garbage.
  12
  13     Fortunately the build environment plays nicely with pkg-config which is
  14     already heavily used by ocaml-freestanding. This patch leaves pkg-config
  15     to its own devices if opam is not present (it can be assisted by a
  16     manually set PKG_CONFIG_PATH environment variable).
  17
  18     Additionally, in configure.sh we check if the target ocaml source
  19     directory already exists. This allows for building ocaml-freestanding
  20     without the ocaml-src package (which would be unnecessarily cumbersome
  21     to package for NixOS) and ocamlfind (one less dependency is always a
  22     nice bonus). The Makefile needs no fix since the target ocaml/Makefile
  23     won't be built if it's already present.
  24
  25 diff --git a/configure.sh b/configure.sh
  26 index 4d154ed..c254f7b 100755
  27 --- a/configure.sh
  28 +++ b/configure.sh
  29 @@ -1,6 +1,8 @@
  30  #!/bin/sh
  31
  32 -export PKG_CONFIG_PATH=$(opam config var prefix)/lib/pkgconfig
  33 +if command -v opam &> /dev/null; then
  34 +    export PKG_CONFIG_PATH=$(opam config var prefix)/lib/pkgconfig
  35 +fi
  36  pkg_exists() {
  37      pkg-config --exists "$@"
  38  }
  39 @@ -21,7 +23,7 @@ if [ -z "${PKG_CONFIG_DEPS}" ]; then
  40      echo "ERROR: solo5-bindings-hvt, solo5-bindings-spt, solo5-bindings-virtio, solo5-bindings-muen, solo5-bindings-genode or solo5-bindings-xen must be installed." 1>&2
  41      exit 1
  42  fi
  43 -ocamlfind query ocaml-src >/dev/null || exit 1
  44 +[ -e "$(dirname "$0")/ocaml" ] || ocamlfind query ocaml-src >/dev/null || exit 1
  45
  46  FREESTANDING_CFLAGS="$(pkg-config --cflags ${PKG_CONFIG_DEPS})"
  47  BUILD_ARCH="$(uname -m)"