allo system compiler

build.zig

@@ -1,20 +1,8 @@
 const std = @import("std");
 
-const c_lib = &[_][]const u8{ "tokenizer.c", "ast.c", "zig1.c" };
-const all_c_files = c_lib ++ &[_][]const u8{"main.c"};
-
-pub fn build(b: *std.Build) void {
-    const target = b.standardTargetOptions(.{});
-    const optimize = b.standardOptimizeOption(.{});
-
-    const lib = b.addStaticLibrary(.{
-        .name = "tokenizer",
-        .optimize = optimize,
-        .target = target,
-    });
-    lib.addCSourceFiles(.{
-        .files = c_lib,
-        .flags = &[_][]const u8{
+const c_lib_files = &[_][]const u8{ "tokenizer.c", "ast.c", "zig1.c" };
+const all_c_files = c_lib_files ++ &[_][]const u8{"main.c"};
+const cflags = &[_][]const u8{
     "-std=c11",
     "-Wall",
     "-Wvla",
@@ -32,9 +20,42 @@ pub fn build(b: *std.Build) void {
     "-fstack-protector-all",
     "-Wimplicit-fallthrough",
     //"-D_FORTIFY_SOURCE=2", // consider when optimization flags are enabled
-        },
+};
+
+pub fn build(b: *std.Build) !void {
+    const target = b.standardTargetOptions(.{});
+    const optimize = b.standardOptimizeOption(.{});
+
+    const lib = b.addStaticLibrary(.{
+        .name = "tokenizer",
+        .optimize = optimize,
+        .target = target,
     });
-    lib.addIncludePath(b.path("."));
+
+    const cc = b.option([]const u8, "cc", "C compiler") orelse "zig";
+
+    if (std.mem.eql(u8, cc, "zig"))
+        lib.addCSourceFiles(.{ .files = c_lib_files, .flags = cflags })
+    else for (c_lib_files) |cfile| {
+        const objfile = try std.fmt.allocPrint(
+            b.allocator,
+            "{s}.o",
+            .{cfile[0 .. cfile.len - 2]},
+        );
+        const cc1 = b.addSystemCommand(&.{cc});
+        cc1.addArgs(cflags);
+        cc1.addArg("-g");
+        cc1.addArgs(switch (optimize) {
+            .Debug => &.{"-O0"},
+            .ReleaseFast, .ReleaseSafe => &.{"-O3"}, // TODO ubsan?
+            .ReleaseSmall => &.{"-Os"},
+        });
+        cc1.addArg("-c");
+        cc1.addFileArg(b.path(cfile));
+        cc1.addArg("-o");
+        const obj = cc1.addOutputFileArg(objfile);
+        lib.addObjectFile(obj);
+    }
     lib.linkLibC();
 
     const test_step = b.step("test", "Run unit tests");