From 0a847fd9804bb1cb107a182c0ce1245abdeb8d10 Mon Sep 17 00:00:00 2001
From: fanquake <fanquake@gmail.com>
Date: Wed, 4 May 2022 16:34:44 +0100
Subject: [PATCH] Merge bitcoin/bitcoin#25046: build: Fix `libmultiprocess`
 cross-compiling to Linux hosts

c0f5cc14ef9fae2b2de4222ee061729629ebb6b4 build: Fix `libmultiprocess` cross-compiling to Linux hosts (Hennadii Stepanov)

Pull request description:

  To successfully call the [`capnp_generate_cpp()`](https://github.com/chaincodelabs/libmultiprocess/blob/d576d975debdc9090bd2582f83f49c76c0061698/CMakeLists.txt#L45) function, the `libmultiprocess` build system must be provided with paths to the native `capnp` and `capnpc-c++` tools.

  This [comment](https://github.com/bitcoin/bitcoin/issues/24387#issuecomment-1054776195) points the same:
  > I think `packages/libmultiprocess.mk` probably needs to be passing a `-DCAPNP_EXECUTABLE=.../depends/arm-linux-gnueabihf/native/bin/capnp` argument to cmake. Also the package should have dependencies on both `capnp` and `native_capnp`.

  Fixes bitcoin/bitcoin#24387.

ACKs for top commit:
  ryanofsky:
    Code review ACK c0f5cc14ef9fae2b2de4222ee061729629ebb6b4

Tree-SHA512: 2986d8bf98d2761eceba21b1897145c5185a0922d4c2084e8812d4d07dc94237e5c2809036641c4f7c491a3414727fff328cba91ce138b89e37ec5cba61d8f61
---
 depends/funcs.mk                    |  2 +-
 depends/packages/libmultiprocess.mk | 10 ++++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/depends/funcs.mk b/depends/funcs.mk
index 8d1d561760..deca7806cc 100644
--- a/depends/funcs.mk
+++ b/depends/funcs.mk
@@ -176,7 +176,7 @@ $(1)_cmake=env CC="$$($(1)_cc)" \
                CXX="$$($(1)_cxx)" \
                CXXFLAGS="$$($(1)_cppflags) $$($(1)_cxxflags)" \
                LDFLAGS="$$($(1)_ldflags)" \
-             cmake -DCMAKE_INSTALL_PREFIX:PATH="$$($($(1)_type)_prefix)"
+             cmake -DCMAKE_INSTALL_PREFIX:PATH="$$($($(1)_type)_prefix)" $$($(1)_cmake_opts)
 ifeq ($($(1)_type),build)
 $(1)_cmake += -DCMAKE_INSTALL_RPATH:PATH="$$($($(1)_type)_prefix)/lib"
 else
diff --git a/depends/packages/libmultiprocess.mk b/depends/packages/libmultiprocess.mk
index 864e33bc9a..9b66207fc5 100644
--- a/depends/packages/libmultiprocess.mk
+++ b/depends/packages/libmultiprocess.mk
@@ -4,6 +4,16 @@ $(package)_download_path=$(native_$(package)_download_path)
 $(package)_file_name=$(native_$(package)_file_name)
 $(package)_sha256_hash=$(native_$(package)_sha256_hash)
 $(package)_dependencies=native_$(package) capnp
+ifneq ($(host),$(build))
+$(package)_dependencies += native_capnp
+endif
+
+define $(package)_set_vars :=
+ifneq ($(host),$(build))
+$(package)_cmake_opts := -DCAPNP_EXECUTABLE="$$(native_capnp_prefixbin)/capnp"
+$(package)_cmake_opts += -DCAPNPC_CXX_EXECUTABLE="$$(native_capnp_prefixbin)/capnpc-c++"
+endif
+endef
 
 define $(package)_config_cmds
   $($(package)_cmake) .