Makefile, .gitignore, .editorconfig, configure, tests/cc-compat.sh: added configure script for compiler optimizations

Makefile

@@ -1,4 +1,4 @@
-# Copyright (c) 2023 Emma Tebibyte <emma@tebibyte.media>
+# Copyright (c) 2023–2024 Emma Tebibyte <emma@tebibyte.media>
 # Copyright (c) 2023 DTB <trinity@trinity.moe>
 # Copyright (c) 2023 Sasha Koshka <sashakoshka@tebibyte.media>
 # SPDX-License-Identifier: FSFAP
@@ -18,19 +18,17 @@
 PREFIX=/usr/local
 
 CC=cc
-CFLAGS=-O3 -Lbuild/lib -idirafter include
-
 RUSTC=rustc
-RUSTCFLAGS=-Copt-level=z -Ccodegen-units=1 -Cpanic=abort -Clto=y \
-	-Cstrip=symbols -Ctarget-cpu=native \
-	--extern sysexits=build/o/libsysexits.rlib
 
-all: false fop intcmp scrut str strcmp true test
+# to build, first run ./configure
+include *.mk
+
+all: false fop intcmp scrut str strcmp true
 
 build:
 	# keep build/include until bindgen(1) has stdin support
 	# https://github.com/rust-lang/rust-bindgen/issues/2703
-	mkdir -p build/bin build/include build/o # build/lib
+	mkdir -p build/bin build/include build/o build/lib
 
 clean:
 	rm -rf build/ dist/
@@ -65,10 +63,10 @@ sysexits: build
 		| $(RUSTC) $(RUSTCFLAGS) --crate-type lib -o build/o/libsysexits.rlib -
 
 false: src/false.rs build
-	$(RUSTC) $(RUSTCFLAGS) -o build/bin/false src/false.rs
+	$(RUSTC) $(RUSTFLAGS) -o build/bin/false src/false.rs
 
 fop: src/fop.rs build sysexits
-	$(RUSTC) $(RUSTCFLAGS) -o build/bin/fop src/fop.rs
+	$(RUSTC) $(RUSTFLAGS) -o build/bin/fop src/fop.rs
 
 intcmp: src/intcmp.c build
 	$(CC) $(CFLAGS) -o build/bin/intcmp src/intcmp.c
@@ -83,4 +81,4 @@ strcmp: src/strcmp.c build
 	$(CC) $(CFLAGS) -o build/bin/strcmp src/strcmp.c
 
 true: src/true.rs build
-	$(RUSTC) $(RUSTCFLAGS) -o build/bin/true src/true.rs
+	$(RUSTC) $(RUSTFLAGS) -o build/bin/true src/true.rs