From: Matt Corallo <git@bluematt.me>
Date: Tue, 4 Jun 2024 22:06:42 +0000 (+0000)
Subject: Don't pass 'embed-bitcode'/'lto' while building proc-macros
X-Git-Url: http://git.bitcoin.ninja/?a=commitdiff_plain;h=45018ac4d74145997bfeb8d478419bbd0d9d2608;p=ldk-c-bindings

Don't pass 'embed-bitcode'/'lto' while building proc-macros

cargo is usually good about not passing `RUSTFLAGS` to build-time
dependencies which need to be built for the host platform rather
than the target platform, but for some reason it does not do so
for `proc-macro` crates.

Thus, we have to manually drop the `embed-bitcode` and `lto`
arguments when calling rustc in our existing rustc wrapper.
---

diff --git a/deterministic-build-wrappers/rustc b/deterministic-build-wrappers/rustc
index b05d340..7acc9c4 100755
--- a/deterministic-build-wrappers/rustc
+++ b/deterministic-build-wrappers/rustc
@@ -7,13 +7,21 @@
 # ever (indirectly) depend on multiple versions of the same crate.
 args=("$@")
 IS_LIGHTNING=false
+SKIP_EMBED_BITCODE=false
 for ((i=0; i<"${#args[@]}"; ++i)); do
     case ${args[i]} in
         --crate-name)
-			if [ "${args[i+1]}" = "lightning" -o "${args[i+1]}" = "lightning_background_processor" -o "${args[i+1]}" = "lightning_invoice" -o "${args[i+1]}" = "lightning_persister" -o "${args[i+1]}" = "lightning_rapid_gossip_sync" -o "${args[i+1]}" = "ldk" ]; then
+			if [ "${args[i+1]}" = "lightning" -o "${args[i+1]}" = "lightning_background_processor" -o "${args[i+1]}" = "lightning_invoice" -o "${args[i+1]}" = "lightning_persister" -o "${args[i+1]}" = "lightning_rapid_gossip_sync" -o "${args[i+1]}" = "lightning_transaction_sync" -o "${args[i+1]}" = "ldk" ]; then
 				IS_LIGHTNING=true
 			fi
 			;;
+		--crate-type)
+			if [ "${args[i+1]}" = "proc-macro" ]; then
+				# If we're building a proc-macro, rustc incorrectly passes our RUSTFLAGS containing
+				# embed-bitcode=yes, which we don't want.
+				SKIP_EMBED_BITCODE=true
+			fi
+			;;
     esac
 done
 for ((i=0; i<"${#args[@]}"; ++i)); do
@@ -24,7 +32,16 @@ for ((i=0; i<"${#args[@]}"; ++i)); do
 				args[i]="metadata=42"
 			fi
 			;;
+		embed-bitcode=yes)
+			if [ "$SKIP_EMBED_BITCODE" = "true" ]; then
+				args[i]="embed-bitcode=no"
+			fi
+			;;
+		lto)
+			if [ "$SKIP_EMBED_BITCODE" = "true" ]; then
+				args[i]="lto=no"
+			fi
+			;;
     esac
 done
-
 $LDK_RUSTC_PATH "${args[@]}"