From 041d8ce3ebfc5cf533e08119f31801571cc05b76 Mon Sep 17 00:00:00 2001
From: tobtoht <tob@featherwallet.org>
Date: Sat, 17 Aug 2024 18:32:47 +0200
Subject: [PATCH] guix: aarch64-linux-gnu Rust FFI cross-compilation [WIP]

---
 contrib/guix/cargo.scm           |  2 ++
 contrib/guix/guix-build          |  9 +++++++++
 contrib/guix/libexec/build.sh    | 24 ++++++++++++++++++++++++
 contrib/guix/libexec/config.toml | 32 ++++++++++++++++++++++++++++++++
 contrib/guix/manifest.scm        |  6 ++++++
 5 files changed, 73 insertions(+)
 create mode 100644 contrib/guix/libexec/config.toml

diff --git a/contrib/guix/cargo.scm b/contrib/guix/cargo.scm
index 89b616eb15b..05e13793c4f 100644
--- a/contrib/guix/cargo.scm
+++ b/contrib/guix/cargo.scm
@@ -2,6 +2,7 @@
              (gnu packages bash)
              ((gnu packages certs) #:select (nss-certs))
              (gnu packages rust)
+             ((gnu packages version-control) #:select (git-minimal))
              ((gnu packages tls) #:select (openssl)))
 
 (packages->manifest
@@ -12,4 +13,5 @@
       nss-certs
       openssl
       rust
+      git-minimal
       (list rust "cargo"))))
\ No newline at end of file
diff --git a/contrib/guix/guix-build b/contrib/guix/guix-build
index 757f4171710..486342f5a51 100755
--- a/contrib/guix/guix-build
+++ b/contrib/guix/guix-build
@@ -373,6 +373,12 @@ EOF
                                  --share="$PWD"=/monero \
                                  -- bash -c "cd /monero/src/fcmp_pp/fcmp_pp_rust &&
                                             cargo fetch &&
+                                            cd /monero &&
+                                            rm -rf /monero/rust &&
+                                            rustc -vV &&
+                                            git clone https://github.com/rust-lang/rust &&
+                                            cd rust &&
+                                            git checkout 7cf61ebde7b22796c69757901dd346d0fe70bd97 &&
                                             rm -rf /monero/cargo &&
                                             mv /home/user/.cargo /monero/cargo"
 
@@ -441,10 +447,13 @@ EOF
         #    Please read the README.md in the same directory as this file for
         #    more information.
         #
+        # TODO: don't pass --network
+        #
         # shellcheck disable=SC2086,SC2031
         time-machine environment --manifest="${PWD}/contrib/guix/manifest.scm" \
                                  --container \
                                  --pure \
+                                 --network \
                                  --no-cwd \
                                  --share="$PWD"=/monero \
                                  --share="$PWD/cargo"=/home/user/.cargo \
diff --git a/contrib/guix/libexec/build.sh b/contrib/guix/libexec/build.sh
index 828059af978..373458ef9bf 100644
--- a/contrib/guix/libexec/build.sh
+++ b/contrib/guix/libexec/build.sh
@@ -49,6 +49,30 @@ DISTNAME="monero-${HOST}-${VERSION}"
 # Use a fixed timestamp for depends builds so hashes match across commits that don't make changes to the build system
 export SOURCE_DATE_EPOCH=1397818193
 
+#####################
+#    Rust Setup     #
+#####################
+
+cd rust
+
+# TODO: generate for target
+cp ../contrib/guix/libexec/config.toml .
+
+# TODO: crti.o not found, don't hardcode this
+export CROSS_LIBRARY_PATH="/gnu/store/f8x57r7v1lw5v9c8hnbhdv24m466970y-glibc-cross-aarch64-linux-gnu-2.27/lib"
+
+# TODO: do we really need to build a new rustc here?
+# TODO: fetch deps in cargo container
+python3 ./x.py -j16 build library/std
+
+# TODO: don't build docs and other stuff we're not going to use
+python3 ./x.py install
+
+# TODO: move to environment setup
+export RUSTC="/usr/local/bin/rustc"
+
+cd ..
+
 #####################
 # Environment Setup #
 #####################
diff --git a/contrib/guix/libexec/config.toml b/contrib/guix/libexec/config.toml
new file mode 100644
index 00000000000..0b21a6a69a0
--- /dev/null
+++ b/contrib/guix/libexec/config.toml
@@ -0,0 +1,32 @@
+[llvm]
+
+download-ci-llvm = false
+
+[build]
+
+target = ["x86_64-unknown-linux-gnu", "aarch64-unknown-linux-gnu"]
+
+cargo = "/home/user/.guix-profile/bin/cargo"
+
+rustc = "/home/user/.guix-profile/bin/rustc"
+
+[install]
+
+[rust]
+
+[target.x86_64-unknown-linux-gnu]
+
+cc = "/home/user/.guix-profile/bin/gcc"
+
+cxx = "/home/user/.guix-profile/bin/g++"
+
+ar = "/home/user/.guix-profile/bin/ar"
+
+linker = "/home/user/.guix-profile/bin/gcc"
+
+llvm-config = "/home/user/.guix-profile/bin/llvm-config"
+
+[target.aarch64-unknown-linux-gnu]
+
+llvm-config = "/home/user/.guix-profile/bin/llvm-config"
+[dist]
diff --git a/contrib/guix/manifest.scm b/contrib/guix/manifest.scm
index b4fd7adf8bc..84d33d5f435 100644
--- a/contrib/guix/manifest.scm
+++ b/contrib/guix/manifest.scm
@@ -29,6 +29,8 @@
              (guix git-download)
              ((guix licenses) #:prefix license:)
              (guix packages)
+             (gnu packages text-editors)
+             (gnu packages certs)
              ((guix utils) #:select (substitute-keyword-arguments)))
 
 (define-syntax-rule (search-our-patches file-name ...)
@@ -259,6 +261,9 @@ chain for " target " development."))
         python-minimal
         ;; Git
         git-minimal
+        ;; TODO: remove this
+        nano
+        nss-certs
     )
   (let ((target (getenv "HOST")))
     (cond ((string-suffix? "-mingw32" target)
@@ -269,6 +274,7 @@ chain for " target " development."))
              (make-mingw-pthreads-cross-toolchain target)))
           ((string-contains target "-linux-gnu")
            (list
+             clang-toolchain-17
              gcc-toolchain-12
              (list gcc-toolchain-12 "static")
              (make-monero-cross-toolchain target)))