fix(c): simplify the template config files

c/.gitignore

@@ -4,12 +4,10 @@ hello
 # build
 *.[aod]
 
-# config
+# language support
 compile_commands.json
-.pre-commit-config.yaml
 .cache
 
 # nix
 .direnv
-.envrc
 result

c/Makefile

@@ -1,21 +1,12 @@
-.POSIX:
-.SUFFIXES: .o
-
 CC ?= gcc
+CFLAGS += @compile_flags.txt
+
 OUT := hello
+BINDIR ?= /usr/bin
 
 SRC += main.c
 OBJ := $(SRC:.c=.o)
 
-CFLAGS += @compile_flags.txt
-CFLAGS += -ffunction-sections -fdata-sections
-
-LDFLAGS := -fwhole-program -flto
-LDFLAGS += -Wl,--gc-sections -s
-
-RM ?= rm -f
-
-.DEFAULT_GOAL: all
 .PHONY: all
 all: $(OUT)
 
@@ -33,3 +24,7 @@ fclean: clean
 .PHONY: re
 .NOTPARALLEL: re
 re: fclean all
+
+.PHONY: install
+install:
+	install -D hello ${BINDIR}/hello --mode 0755

c/compile_flags.txt

@@ -3,16 +3,6 @@
 -pipe
 
 -Wall
--Wcast-qual
--Wconversion
--Werror=return-type
--Werror=vla-larger-than=0
 -Wextra
--Wmissing-prototypes
--Wshadow
--Wstrict-prototypes
--Wwrite-strings
 
 -O2
--march=native
--mtune=native

c/flake.nix

@@ -8,37 +8,20 @@
     let
       forAllSystems =
         function:
-        nixpkgs.lib.genAttrs [
-          "x86_64-linux"
-          "aarch64-linux"
-          "x86_64-darwin"
-          "aarch64-darwin"
-          "i686-linux"
-          "mipsel-linux"
-          "powerpc64le-linux"
-        ] (system: function nixpkgs.legacyPackages.${system});
+        nixpkgs.lib.genAttrs nixpkgs.lib.systems.flakeExposed (
+          system: function nixpkgs.legacyPackages.${system}
+        );
     in
     rec {
       devShells = forAllSystems (pkgs: {
-        default = pkgs.mkShell {
-          hardeningDisable = [ "fortify" ];
-          inputsFrom = pkgs.lib.attrsets.attrValues packages;
-        };
+        default = pkgs.mkShell { inputsFrom = [ packages.${pkgs.system}.hello ]; };
       });
 
       packages = forAllSystems (pkgs: rec {
         default = hello;
-        hello = pkgs.callPackage ./default.nix { };
+        hello = pkgs.callPackage ./hello.nix { };
       });
 
-      overlays.default = final: prev: { hello = final.callPackage ./default.nix { }; };
-
-      apps = forAllSystems (pkgs: rec {
-        default = hello;
-        hello = {
-          program = "${packages.${pkgs.system}.hello}/bin/hello";
-          type = "app";
-        };
-      });
+      overlays.default = final: prev: { hello = prev.callPackage ./default.nix { }; };
     };
 }

c/hello.nix

@@ -0,0 +1,7 @@
+{ stdenv }:
+stdenv.mkDerivation {
+  name = "hello";
+  src = ./.;
+
+  env.BINDIR = "${placeholder "out"}/bin";
+}

c/main.c

@@ -1,16 +1,8 @@
+#include <stdio.h>
 #include <stdlib.h>
-#include <unistd.h>
-
-#define lengthof(sstr) (sizeof (sstr) / sizeof *(sstr))
-#define sstr_len(sstr) (lengthof(sstr) - 1)
-#define sstr_unpack(sstr) (sstr), (sstr_len(sstr))
-
-static const char GREETING[] = "hello, world!\n";
 
 int main(void)
 {
-    return (
-        write(STDOUT_FILENO, sstr_unpack(GREETING))
-        == sstr_len(GREETING)
-    ) ? EXIT_SUCCESS : EXIT_FAILURE;
+    printf("hello, world!\n");
+    return EXIT_SUCCESS;
 }