doom compiles but is BIG

user-apps/doom/build.rs

@@ -11,9 +11,13 @@
 use std::env;
 use std::fs::File;
 use std::io::Write;
-use std::path::PathBuf;
+use std::path::{Path, PathBuf};
+use std::process::Command;
 
 fn main() {
+    build_newlib();
+    build_doom();
+
     // Put `memory.x` in our output directory and ensure it's
     // on the linker search path.
     let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
@@ -25,7 +29,58 @@ fn main() {
 
     println!("cargo:rerun-if-changed=memory.x");
     println!("cargo:rustc-link-arg-bins=-Tmemory.x");
+}
 
+// TODO: use target to change newlib build - only workds for rp2350 right now
+fn build_newlib() {
+    let out_dir = std::env::var("OUT_DIR").unwrap();
+    let picolibc_dir = format!("{}/picolibc", out_dir);
+
+    if !Path::new(&picolibc_dir).exists() {
+        let status = Command::new("git")
+            .args(&[
+                "clone",
+                "https://github.com/picolibc/picolibc",
+                &picolibc_dir,
+            ])
+            .status()
+            .expect("Failed to clone picolibc");
+        assert!(status.success());
+    }
+
+    let build_dir = format!("{}/build", picolibc_dir);
+    std::fs::create_dir_all(&build_dir).unwrap();
+
+    let status = Command::new(&format!("{picolibc_dir}/scripts/do-configure"))
+        .current_dir(&build_dir)
+        .args(&[
+            "thumbv8m_main_fp-none-eabi",
+            "--buildtype=minsize",
+            "-Dtests=true",
+            "-Dtinystdio=false",
+            "-Dsingle-thread=true",
+            "-Db_pie=true",
+            "-Ddefault_library=static",
+            "-Dtinystdio=false",
+            "-Dmultilib=false",
+            ".",
+        ])
+        .status()
+        .expect("Failed to run Meson configure");
+    assert!(status.success());
+
+    let status = Command::new("ninja")
+        .current_dir(&build_dir)
+        .status()
+        .expect("Failed to run Ninja build");
+    assert!(status.success());
+
+    println!("cargo:rustc-link-search={}/newlib", build_dir);
+    println!("cargo:rustc-link-lib=c");
+    println!("cargo:rustc-link-lib=m");
+}
+
+fn build_doom() {
     let ref dg_src_dir = std::path::PathBuf::from("doomgeneric/doomgeneric");
     let mut dg_c_paths = vec![];
     let mut dg_h_paths = vec![];
@@ -37,6 +92,7 @@ fn main() {
             if filename.starts_with("doomgeneric")
                 || filename.contains("_allegro")
                 || filename.contains("_sdl")
+                || filename.contains("net_")
                 || filename == "i_main.c"
             {
                 continue;
@@ -55,16 +111,16 @@ fn main() {
         .for_each(|path| println!("cargo:rerun-if-changed={}", path.to_str().unwrap()));
 
     cc::Build::new()
+        .compiler("arm-none-eabi-gcc")
         .flag("-w") // silence warnings
         .flag("-Os") // optimize for size
+        .flag("-ffunction-sections")
+        .flag("-fdata-sections")
         .define("CMAP256", None)
         .define("DOOMGENERIC_RESX", Some("320"))
         .define("DOOMGENERIC_RESY", Some("200"))
-        .define("MAXPLAYERS", Some("1"))
-        .flag_if_supported("-std=gnu89") // old-style C, allows implicit int
-        .flag("-Wno-implicit-function-declaration") // ignore missing prototypes
+        .flag_if_supported("-std=gnu99")
         .define("_POSIX_C_SOURCE", Some("200809L"))
         .files(dg_c_paths)
-        .include(".")
         .compile("doomgeneric");
 }