Add Makefile with common Rust project targets

* Adds pkgconfig target to generate pkg-config file
* Extract version from Cargo.toml and make install platform-aware
* Build static lib only, use INSTALL env var, generate pkg-config from template

Co-authored-by: Erik de Castro Lopo <erikd@mega-nerd.com>

Author: Copilot

Makefile

@@ -0,0 +1,93 @@
+.PHONY: all build build-release test clean fmt fmt-check clippy check doc doc-open ci help pkgconfig install
+
+# Default target
+all: build
+
+# Build the project in debug mode
+build:
+	cd rust_accumulator && cargo build
+
+# Build the project in release mode
+build-release:
+	cd rust_accumulator && cargo build --release
+
+# Run tests
+test:
+	cd rust_accumulator && cargo test
+
+# Format code using rustfmt
+fmt:
+	cd rust_accumulator && cargo fmt
+
+# Check formatting
+fmt-check:
+	cd rust_accumulator && cargo fmt --check
+
+# Run clippy linter
+clippy:
+	cd rust_accumulator && cargo clippy -- -D warnings
+
+# Clean build artifacts
+clean:
+	cd rust_accumulator && cargo clean
+
+# Check the project (quick verification without building)
+check:
+	cd rust_accumulator && cargo check
+
+# Build documentation
+doc:
+	cd rust_accumulator && cargo doc --no-deps
+
+# Open documentation in browser
+doc-open:
+	cd rust_accumulator && cargo doc --no-deps --open
+
+# Run all checks (format, clippy, test)
+ci: fmt-check clippy test
+
+# Generate pkg-config file
+pkgconfig: build-release
+	@if [ -z "$$INSTALL" ]; then \
+		echo "Error: INSTALL environment variable is not set."; \
+		echo "Please set INSTALL to the installation directory, e.g.: export INSTALL=/usr/local"; \
+		exit 1; \
+	fi
+	@mkdir -p rust_accumulator/target/pkgconfig
+	@VERSION=$$(grep '^version' rust_accumulator/Cargo.toml | head -1 | cut -d'"' -f2); \
+	sed -e "s|@PREFIX@|$$INSTALL|g" -e "s|@VERSION@|$$VERSION|g" \
+		librust_accumulator.pc.in > rust_accumulator/target/pkgconfig/librust_accumulator.pc
+	@echo "pkg-config file created at rust_accumulator/target/pkgconfig/librust_accumulator.pc"
+
+# Install library and pkg-config file
+install: build-release pkgconfig
+	@if [ -z "$$INSTALL" ]; then \
+		echo "Error: INSTALL environment variable is not set."; \
+		echo "Please set INSTALL to the installation directory, e.g.: export INSTALL=/usr/local"; \
+		exit 1; \
+	fi
+	@echo "Installing to: $$INSTALL"
+	install -d $$INSTALL/lib
+	install -m 644 rust_accumulator/target/release/librust_accumulator.a $$INSTALL/lib/
+	install -d $$INSTALL/lib/pkgconfig
+	install -m 644 rust_accumulator/target/pkgconfig/librust_accumulator.pc $$INSTALL/lib/pkgconfig/
+	@echo "Installation complete. Library installed to $$INSTALL/lib/"
+
+# Show help
+help:
+	@echo "Available targets:"
+	@echo "  all           - Build the project in debug mode (default)"
+	@echo "  build         - Build the project in debug mode"
+	@echo "  build-release - Build the project in release mode"
+	@echo "  test          - Run tests"
+	@echo "  fmt           - Format code using rustfmt"
+	@echo "  fmt-check     - Check if code is formatted correctly"
+	@echo "  clippy        - Run clippy linter"
+	@echo "  check         - Quick check without building"
+	@echo "  clean         - Clean build artifacts"
+	@echo "  doc           - Build documentation"
+	@echo "  doc-open      - Build and open documentation in browser"
+	@echo "  ci            - Run all checks (format, clippy, test)"
+	@echo "  pkgconfig     - Generate pkg-config file (requires INSTALL env var)"
+	@echo "  install       - Install library and pkg-config file (requires INSTALL env var)"
+	@echo "  help          - Show this help message"

librust_accumulator.pc.in

@@ -0,0 +1,11 @@
+prefix=@PREFIX@
+exec_prefix=${prefix}
+libdir=${exec_prefix}/lib
+includedir=${prefix}/include
+
+Name: librust_accumulator
+Description: A rust based lib for a PCS based accumulator
+Version: @VERSION@
+
+Cflags: -I${includedir}
+Libs: -L${libdir} -lrust_accumulator

rust_accumulator/Cargo.toml

@@ -5,7 +5,7 @@ edition = "2018"
 
 [lib]
 name = "rust_accumulator"
-crate-type = ["cdylib", "rlib"]
+crate-type = ["staticlib"]
 
 [dependencies]
 blstrs = "0.7.1"