From 5fe972a3a00254bf5aab6e3f5a07a8b18046b330 Mon Sep 17 00:00:00 2001
From: Lokathor <zefria@gmail.com>
Date: Sun, 28 Apr 2024 21:17:27 -0600
Subject: [PATCH] gate GBA specific code behind a cargo feature so that it can
 build (badly) on a host machine.

---
 .cargo/config.toml               |  6 +++---
 Cargo.toml                       |  5 ++++-
 src/builtin_art/cga_8x8_thick.rs | 15 +++++++--------
 src/lib.rs                       |  8 ++++++++
 src/prelude.rs                   | 11 +++++------
 5 files changed, 27 insertions(+), 18 deletions(-)

diff --git a/.cargo/config.toml b/.cargo/config.toml
index 9b9b1ce2..9a980fdd 100644
--- a/.cargo/config.toml
+++ b/.cargo/config.toml
@@ -1,9 +1,9 @@
 [build]
-target = "thumbv4t-none-eabi"
+#target = "thumbv4t-none-eabi"
 
 [unstable]
-build-std = ["core"]
-build-std-features = ["compiler-builtins-weak-intrinsics"]
+#build-std = ["core"]
+#build-std-features = ["compiler-builtins-weak-intrinsics"]
 
 [target.thumbv4t-none-eabi]
 runner = "mgba-qt"
diff --git a/Cargo.toml b/Cargo.toml
index bff7f570..823f1012 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,12 +9,15 @@ license = "Zlib OR Apache-2.0 OR MIT"
 [features]
 default = ["track_caller"]
 track_caller = []
+on_gba = []
 
 [dependencies]
 voladdress = "1.3.0"
 bitfrob = "1"
 bracer = "0.1.2"
-critical-section = { version = "1.1.2", features = ["restore-state-bool"], optional = true }
+critical-section = { version = "1.1.2", features = [
+  "restore-state-bool",
+], optional = true }
 
 [profile.dev]
 opt-level = 3
diff --git a/src/builtin_art/cga_8x8_thick.rs b/src/builtin_art/cga_8x8_thick.rs
index a6fbf894..ce6918e8 100644
--- a/src/builtin_art/cga_8x8_thick.rs
+++ b/src/builtin_art/cga_8x8_thick.rs
@@ -2,10 +2,7 @@ use core::mem::size_of_val;
 
 use voladdress::{Safe, VolRegion};
 
-use crate::{
-  bios::{BitUnPack, BitUnpackInfo},
-  video::{Tile4, Tile8},
-};
+use crate::video::{Tile4, Tile8};
 
 macro_rules! glyph {
   ($name:ident = $id:expr) => {
@@ -69,19 +66,20 @@ impl Cga8x8Thick {
   /// ## Panics
   /// * Requires at least 256 elements of space within the region.
   #[inline]
+  #[cfg(feature = "on_gba")]
   pub fn bitunpack_4bpp(
     self, b: VolRegion<Tile4, Safe, Safe>, offset_and_touch_zero: u32,
   ) {
     assert!(b.len() >= 256);
     let src = CGA_8X8_THICK.as_ptr();
     let dest = b.index(0).as_usize() as *mut u32;
-    let info = BitUnpackInfo {
+    let info = crate::bios::BitUnpackInfo {
       src_byte_len: size_of_val(&CGA_8X8_THICK) as u16,
       src_elem_width: 1,
       dest_elem_width: 4,
       offset_and_touch_zero,
     };
-    unsafe { BitUnPack(src.cast(), dest, &info) };
+    unsafe { crate::bios::BitUnPack(src.cast(), dest, &info) };
   }
 
   /// Bit unpacks the data (8bpp depth) to the location given.
@@ -92,19 +90,20 @@ impl Cga8x8Thick {
   /// ## Panics
   /// * Requires at least 256 elements of space within the region.
   #[inline]
+  #[cfg(feature = "on_gba")]
   pub fn bitunpack_8bpp(
     self, b: VolRegion<Tile8, Safe, Safe>, offset_and_touch_zero: u32,
   ) {
     assert!(b.len() >= 256);
     let src = CGA_8X8_THICK.as_ptr();
     let dest = b.index(0).as_usize() as *mut u32;
-    let info = BitUnpackInfo {
+    let info = crate::bios::BitUnpackInfo {
       src_byte_len: size_of_val(&CGA_8X8_THICK) as u16,
       src_elem_width: 1,
       dest_elem_width: 8,
       offset_and_touch_zero,
     };
-    unsafe { BitUnPack(src.cast(), dest, &info) };
+    unsafe { crate::bios::BitUnPack(src.cast(), dest, &info) };
   }
 }
 
diff --git a/src/lib.rs b/src/lib.rs
index 4cd643c8..565f694c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -4,6 +4,7 @@
 #![warn(clippy::missing_inline_in_public_items)]
 #![allow(clippy::let_and_return)]
 #![allow(clippy::result_unit_err)]
+#![allow(unused_imports)]
 //#![warn(missing_docs)]
 
 //! A crate for GBA development.
@@ -88,18 +89,25 @@
 
 mod macros;
 
+#[cfg(feature = "on_gba")]
 pub mod asm_runtime;
+#[cfg(feature = "on_gba")]
 pub mod bios;
 pub mod builtin_art;
 #[cfg(feature = "critical-section")]
 mod critical_section;
+#[cfg(feature = "on_gba")]
 pub mod dma;
 pub mod fixed;
+#[cfg(feature = "on_gba")]
 pub mod gba_cell;
 pub mod interrupts;
 pub mod keys;
+#[cfg(feature = "on_gba")]
 pub mod mem_fns;
+#[cfg(feature = "on_gba")]
 pub mod mgba;
+#[cfg(feature = "on_gba")]
 pub mod mmio;
 pub mod prelude;
 pub mod random;
diff --git a/src/prelude.rs b/src/prelude.rs
index f5761ded..45b30dc5 100644
--- a/src/prelude.rs
+++ b/src/prelude.rs
@@ -1,17 +1,16 @@
 //! A module that just re-exports all the other modules of the crate.
 
+#[cfg(feature = "on_gba")]
+pub use crate::{
+  asm_runtime::*, bios::*, dma::*, gba_cell::*, mgba::*, mmio::*,
+};
+
 pub use crate::{
-  asm_runtime::*,
-  bios::*,
   builtin_art::*,
-  dma::*,
   fixed::*,
-  gba_cell::*,
   include_aligned_bytes,
   interrupts::*,
   keys::*,
-  mgba::*,
-  mmio::*,
   sound::*,
   timers::*,
   video::{obj::*, *},