From 40d8518253c2566fe9ba947c2e1fbce160a55940 Mon Sep 17 00:00:00 2001
From: xavier <xavierb@gmail.com>
Date: Sun, 23 May 2021 16:51:22 +0200
Subject: [PATCH] apply -flto and -ffunction-sections when compiling libc++

---
 src/libcxx.zig    | 4 ++++
 src/libunwind.zig | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/src/libcxx.zig b/src/libcxx.zig
index e235403d40..39c5fabedd 100644
--- a/src/libcxx.zig
+++ b/src/libcxx.zig
@@ -174,6 +174,8 @@ pub fn buildLibCXX(comp: *Compilation) !void {
         .want_tsan = comp.bin_file.options.tsan,
         .want_pic = comp.bin_file.options.pic,
         .want_pie = comp.bin_file.options.pie,
+        .want_lto = comp.bin_file.options.lto,
+        .function_sections = comp.bin_file.options.function_sections,
         .emit_h = null,
         .strip = comp.compilerRtStrip(),
         .is_native_os = comp.bin_file.options.is_native_os,
@@ -292,6 +294,8 @@ pub fn buildLibCXXABI(comp: *Compilation) !void {
         .want_tsan = comp.bin_file.options.tsan,
         .want_pic = comp.bin_file.options.pic,
         .want_pie = comp.bin_file.options.pie,
+        .want_lto = comp.bin_file.options.lto,
+        .function_sections = comp.bin_file.options.function_sections,
         .emit_h = null,
         .strip = comp.compilerRtStrip(),
         .is_native_os = comp.bin_file.options.is_native_os,
diff --git a/src/libunwind.zig b/src/libunwind.zig
index c2d0475d6f..7e1fe3f9b7 100644
--- a/src/libunwind.zig
+++ b/src/libunwind.zig
@@ -113,6 +113,8 @@ pub fn buildStaticLib(comp: *Compilation) !void {
         .want_tsan = false,
         .want_pic = comp.bin_file.options.pic,
         .want_pie = comp.bin_file.options.pie,
+        .want_lto = comp.bin_file.options.lto,
+        .function_sections = comp.bin_file.options.function_sections,
         .emit_h = null,
         .strip = comp.compilerRtStrip(),
         .is_native_os = comp.bin_file.options.is_native_os,