Avoid dependencies of build-deps on MacOS by pinning cc

Sadly we have to hack around cargo to make this work with
`-Zbuild-std`.

diff --git a/genbindings.sh b/genbindings.sh
index 34982335a58067de41476b736a71f40aa3248c62..dcfc5ac9a3199593c0cb0b33bd399a276b4f59ad 100755 (executable)
--- a/genbindings.sh
+++ b/genbindings.sh
@@ -353,13 +353,33 @@ if [ "$2" = "true" ]; then
        ls -lha a.out
 fi
 
+function REALLY_PIN_CC {
+       # -Zbuild-std fails if we have any dependencies of build-deps, which
+       # cc added in 1.0.80, thus we pin back to 1.0.79 to avoid that.
+       cargo update -p cc --precise "1.0.79" --verbose
+       ( cargo build --features=std -v --release -Zbuild-std=std,panic_abort > /dev/null 2>&1 ) || echo -n
+       ( cargo build --features=std -v --release --target aarch64-apple-darwin -Zbuild-std=std,panic_abort > /dev/null 2>&1 ) || echo -n
+       # Sadly, std also depends on cc, and we can't pin it in that tree
+       # directly. Instead, we have to delete the file out of the cargo
+       # registry and build --offline to avoid it using the latest version.
+       NEW_CC_DEP="$CARGO_HOME"
+       [ "$NEW_CC_DEP" = "" ] && NEW_CC_DEP="$HOME"
+       if [ -f "$NEW_CC_DEP/.cargo/registry/cache/github.com-"*/cc-1.0.79.crate ]; then
+               mv "$NEW_CC_DEP/.cargo/registry/cache/github.com-"*/cc-1.0.79.crate ./
+       fi
+       rm -f "$NEW_CC_DEP/.cargo/registry/cache/github.com-"*/cc-*.crate
+       [ -f ./cc-1.0.79.crate ] && mv ./cc-1.0.79.crate "$NEW_CC_DEP/.cargo/registry/cache/github.com-"*/
+}
+
 # Then, check with memory sanitizer, if we're on Linux and have rustc nightly
 if [ "$HOST_PLATFORM" = "x86_64-unknown-linux-gnu" ]; then
        if cargo +nightly --version >/dev/null 2>&1; then
                LLVM_V=$(rustc +nightly --version --verbose | grep "LLVM version" | awk '{ print substr($3, 0, 2); }')
                if [ -x "$(which clang-$LLVM_V)" ]; then
                        cargo +nightly clean
-                       cargo +nightly rustc $CARGO_BUILD_ARGS -Zbuild-std=std,panic_abort --target x86_64-unknown-linux-gnu -v -- -Zsanitizer=memory -Zsanitizer-memory-track-origins -Cforce-frame-pointers=yes
+
+                       REALLY_PIN_CC
+                       cargo +nightly rustc --offline $CARGO_BUILD_ARGS -Zbuild-std=std,panic_abort --target x86_64-unknown-linux-gnu -v -- -Zsanitizer=memory -Zsanitizer-memory-track-origins -Cforce-frame-pointers=yes
                        mv target/x86_64-unknown-linux-gnu/debug/libldk.* target/debug/
 
                        # Sadly, std doesn't seem to compile into something that is memsan-safe as of Aug 2020,
@@ -552,12 +572,13 @@ if [ "$CLANGPP" != "" -a "$LLD" != "" ]; then
        LINK_ARG_FLAGS="-C link-arg=-fuse-ld=$LLD"
        export LDK_CLANG_PATH=$(which $CLANG)
        if [ "$MACOS_SDK" != "" ]; then
+               REALLY_PIN_CC
                export CLANG="$(pwd)/../deterministic-build-wrappers/clang-lto-link-osx"
                for ARG in $CFLAGS_aarch64_apple_darwin; do
                        MANUAL_LINK_CFLAGS="$MANUAL_LINK_CFLAGS -C link-arg=$ARG"
                done
                export CFLAGS_aarch64_apple_darwin="$CFLAGS_aarch64_apple_darwin -O3 -fPIC -fembed-bitcode"
-               RUSTC_BOOTSTRAP=1 RUSTFLAGS="$BASE_RUSTFLAGS -C target-cpu=apple-a14 -C embed-bitcode=yes -C linker-plugin-lto -C lto -C linker=$CLANG $MANUAL_LINK_CFLAGS $LINK_ARG_FLAGS -C link-arg=-mcpu=apple-a14" CARGO_PROFILE_RELEASE_LTO=true cargo build $CARGO_BUILD_ARGS -v --release --target aarch64-apple-darwin -Zbuild-std=std,panic_abort
+               RUSTC_BOOTSTRAP=1 RUSTFLAGS="$BASE_RUSTFLAGS -C target-cpu=apple-a14 -C embed-bitcode=yes -C linker-plugin-lto -C lto -C linker=$CLANG $MANUAL_LINK_CFLAGS $LINK_ARG_FLAGS -C link-arg=-mcpu=apple-a14" CARGO_PROFILE_RELEASE_LTO=true cargo build $CARGO_BUILD_ARGS --offline -v --release --target aarch64-apple-darwin -Zbuild-std=std,panic_abort
                if [ "$HOST_OSX" != "true" ]; then
                        # If we're not on OSX but can build OSX binaries, build the x86_64 OSX release now
                        MANUAL_LINK_CFLAGS=""
@@ -565,7 +586,7 @@ if [ "$CLANGPP" != "" -a "$LLD" != "" ]; then
                                MANUAL_LINK_CFLAGS="$MANUAL_LINK_CFLAGS -C link-arg=$ARG"
                        done
                        export CFLAGS_x86_64_apple_darwin="$CFLAGS_x86_64_apple_darwin -O3 -fPIC -fembed-bitcode"
-                       RUSTC_BOOTSTRAP=1 RUSTFLAGS="$BASE_RUSTFLAGS -C target-cpu=sandybridge -C embed-bitcode=yes -C linker-plugin-lto -C lto -C linker=$CLANG $MANUAL_LINK_CFLAGS $LINK_ARG_FLAGS -C link-arg=-mcpu=sandybridge -C link-arg=-mtune=sandybridge" CARGO_PROFILE_RELEASE_LTO=true cargo build $CARGO_BUILD_ARGS -v --release --target x86_64-apple-darwin -Zbuild-std=std,panic_abort
+                       RUSTC_BOOTSTRAP=1 RUSTFLAGS="$BASE_RUSTFLAGS -C target-cpu=sandybridge -C embed-bitcode=yes -C linker-plugin-lto -C lto -C linker=$CLANG $MANUAL_LINK_CFLAGS $LINK_ARG_FLAGS -C link-arg=-mcpu=sandybridge -C link-arg=-mtune=sandybridge" CARGO_PROFILE_RELEASE_LTO=true cargo build $CARGO_BUILD_ARGS --offline -v --release --target x86_64-apple-darwin -Zbuild-std=std,panic_abort
                fi
        fi
        # If we're on an M1 don't bother building X86 binaries