##
## Suggestions from Claude Opus 4.5 to further reduce binary size
## (deleted as we incorporate them)
##

High-Impact Optimizations (Minimal Performance Cost)

  4. Remove format! macros (~5-15 KiB)

  Search for format!(), write!(), and writeln!() calls. Replace with:
  - Pre-built string constants
  - Manual byte buffer writing
  - String concatenation with push_str()

● You have 73 formatting macro calls - significant savings opportunity by replacing hot paths with string literals.

  5. Use fixed-size buffers in TLS handshake (~2-5 KiB)

  Replace Vec<u8> allocations in TLS with stack arrays:

  // Instead of: let mut buf = Vec::with_capacity(8192);
  let mut buf = [0u8; 8192];
  let mut len = 0;
  // ... write to &mut buf[len..]

  6. Disable inlining aggressively (~10-15 KiB, slight perf loss)

  # .cargo/config.toml
  rustflags = [
      # ... existing flags ...
      "-C", "llvm-args=-inline-threshold=0",
  ]

  This prevents aggressive inlining. Test performance impact.

  Medium-Impact Optimizations

  8. Use abort for allocation failures (~2-4 KiB)

  Your allocator could use simpler error handling:

  unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
      let ptr = libc::malloc(layout.size()) as *mut u8;
      if ptr.is_null() {
          libc::abort(); // Instead of returning null
      }
      ptr
  }

  10. Remove DWARF sections if present

● Bash(readelf -S target/release/ort | grep -E 'debug|eh_frame')
  ⎿    [12] .eh_frame_hdr     PROGBITS         000000000020b2a0  0000b2a0
       [13] .eh_frame         PROGBITS         000000000020bb68  0000bb68

● Your binary has .eh_frame sections (exception handling frames). Remove with:

  rustflags = [
      # ...
      "-C", "link-arg=-Wl,--no-eh-frame-hdr",
  ]

  Low-Impact / Advanced Optimizations

  11. Use #[inline(never)] on cold paths

  Mark error handling and uncommon paths:

  #[inline(never)]
  #[cold]
  fn handle_error(...) { ... }

  13. Custom sections removal

● Bash(readelf -S target/release/ort | awk '{print $2, $6}' | grep -v '^$' | head -20)
  ⎿  are starting

     Headers:
     … +17 lines (ctrl+o to expand)

● Bash(size -A target/release/ort | head -20)
  ⎿  target/release/ort  :
     section                   size      addr
     .interp                     28   2097832
     … +17 lines (ctrl+o to expand)

● Perfect! Section breakdown shows:
  - .text: 164 KiB (code) - largest section
  - .rodata: 40.7 KiB (string literals, constants)
  - .eh_frame: 15 KiB total - unwinding tables (removable with suggestion #1)

  Estimated Savings Summary

  | Optimization           | Savings   | Performance Impact |
  |------------------------|-----------|--------------------|
  | panic_immediate_abort  | 10-15 KiB | None               |
  | Error codes vs Strings | 5-10 KiB  | None               |
  | Remove format! macros  | 5-15 KiB  | None               |
  | opt-level = "z"        | 3-8 KiB   | Slight (~5-10%)    |
  | Fixed TLS buffers      | 2-5 KiB   | None               |
  | Inline threshold=0     | 10-15 KiB | Moderate (~10-20%) |
  | Version script         | 1-2 KiB   | None               |
  | Total (no perf loss)   | 23-47 KiB | Minimal            |
  | Total (with perf)      | 36-70 KiB | Acceptable         |
  | UPX compression        | ~92 KiB   | Startup only       |

  Recommended Implementation Order

  1. Start with #1 (panic_immediate_abort) - biggest win, zero downside
  2. Try #3 (opt-level = "z") - test if perf acceptable
  3. Profile hot paths, then remove format! from them (#4)
  4. Consider UPX (#12) if distribution size matters


 ---------

##
## Suggestions from Codex 5.1 to further reduce binary size:
## (moved to bottom section as I try them, or deleted if I didn't like them)
##

- Trim formatting machinery in errors: src/common/error.rs stores Strings and implements Display, ToString, and context.join, which drags in core::fmt glue and allocation helpers. Converting OrtError to hold &'static str plus a small error code (or a fixed small buffer) and printing fixed strings can shed several KB.

- Reduce heap usage in TLS: src/net/tls.rs builds ClientHello/extensions with multiple Vecs and uses format!. Replacing them with fixed-size stack buffers and manual length accounting (no format!, no ToString) both shrinks code and keeps allocator code paths colder; similarly, consider an #[inline(never)] on the larger crypto helpers to avoid LTO inlining bloat.

##
## Things I tried based on GPT 5.1 Codex Max suggestions
##

## These ideas are incorporated

Don't make it a PIE (Position Independent Executable). Saves 7 KiB.
	-C relocation-model=static

Remove build-id:
	-C link-args=-Wl,--build-id=none

- Consider building with nightly using -Zbuild-std=core,alloc -Zbuild-std -features=panic_immediate_abort plus panic="abort" (already set) so you can delete the manual eh_personality shim and the #[link(name="gcc_s")] stub in src/main.rs, removing the libgcc
unwinder dependency altogether.

## These work, figure out if we want them

Disable inlining. Saves ~12 Kib, but will possibly be slower.
	-C llvm-args=--inline-threshold=0

(in Cargo.toml)

Compile for size rather than performance. Save 20 Kib.
	[profile.release]
	opt-level = "z" # instead of "s"

## These don't work, it gets bigger or doesn't change

(in RUSTFLAGS)

"fold identical functions". Make it about 5 KiB bigger, which is strange.
	-C link-args=-Wl,--icf=all

"drop long path strings from diagnostics metadata"
	--remap-path-prefix=.=.  # This also goes in RUSTFLAGS

9. Reduce dynamic symbols (~1-2 KiB)

  You have 50 dynamic symbols. Use version scripts to hide unnecessary ones:

  # Create link.ld
  {
    global: main;
    local: *;
  };

  # .cargo/config.toml
  rustflags = [
      # ...
      "-C", "link-arg=-Wl,--version-script=link.ld",
  ]


## This I had already and need to keep
## in RUSTFLAGS

-C target-cpu=native

## How to do it
##

Set `RUSTFLAGS` in a `.cargo/config.toml` file at the root of your project:

    [env]
    RUSTFLAGS="-C target-cpu=native"

OR (also in .cargo/config.toml)

	[build]
	rustflags = ["-C", "target-cpu=native"]

