Match the croaring-sys version with the version of CRoaring

.gitignore

@@ -1,4 +1,5 @@
 target
 .DS_Store
 .idea
-/README.md.tmp
+README.md.tmp
+Cargo.toml.tmp

Makefile

@@ -15,7 +15,7 @@ test:
 croaring_release_url_base = https://github.com/RoaringBitmap/CRoaring/releases/download
 
 # Fetch the c source amalgamation from a tagged CRoaring release (like `make version=0.9.3 update_croaring`)
-update_croaring: download_croaring bindgen update_readme_croaring_version
+update_croaring: download_croaring bindgen update_readme_croaring_version update_croaring_sys_version
 
 download_croaring:
 	rm -f '$(croaring_source)/roaring.c' '$(croaring_source)/roaring.h' '$(croaring_source)/roaring.hh'
@@ -42,6 +42,12 @@ update_readme_croaring_version:
 	@sed -r -e 's_\[CRoaring version `[0-9]+\.[0-9]+\.[0-9]+`\]\([^\)]+\)_[CRoaring version `$(version)`](https://github.com/RoaringBitmap/CRoaring/releases/tag/v$(version))_' README.md > README.md.tmp
 	@mv README.md.tmp README.md
 
+# We don't always want to update the version of croaring-sys dependency in croaring, but we always want to update croaring-sys
+update_croaring_sys_version:
+	@echo "Updating croaring-sys version in Cargo.toml to $(version)"
+	@sed -r -e 's/^version = ".*"/version = "$(version)"/' croaring-sys/Cargo.toml > croaring-sys/Cargo.toml.tmp
+	@mv croaring-sys/Cargo.toml.tmp croaring-sys/Cargo.toml
+
 # Build a c program to (re)generate the example serialized files for testing
 test_serialization_files:
 	cd croaring/tests/data/ && \

croaring-sys/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "croaring-sys"
-version = "3.0.0"
+version = "4.0.0"
 edition = "2021"
 authors = ["croaring-rs developers"]
 license = "Apache-2.0"

croaring/Cargo.toml

@@ -25,7 +25,7 @@ roaring = "0.10"
 criterion = { version = "0.5", features = ["html_reports"] }
 
 [dependencies]
-ffi = { package = "croaring-sys", path = "../croaring-sys", version = "3.0.0" }
+ffi = { package = "croaring-sys", path = "../croaring-sys", version = "4.0.0" }
 
 [[bench]]
 name = "benches"