From 59d4a52fe47ae6131a43f644ced197f60ceb7fb3 Mon Sep 17 00:00:00 2001
From: Fabio Alessandrelli <fabio.alessandrelli@gmail.com>
Date: Tue, 24 Sep 2024 14:13:51 +0200
Subject: [PATCH] [Web] Use Oz instead of Os when optimizing for size

LLVM has an Oz optimization flag, which they define as:

`Like -Os (and thus -O2), but reduces code size further.`

I've tested this, on a release builds, and the result is ~25% smaller
uncompressed size, and ~10% smaller when compressed.
---
 SConstruct | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/SConstruct b/SConstruct
index 0245531b45e..c520bcfe12e 100644
--- a/SConstruct
+++ b/SConstruct
@@ -770,8 +770,12 @@ else:
         env.Append(CCFLAGS=["-O2"])
         env.Append(LINKFLAGS=["-O2"])
     elif env["optimize"] == "size":
-        env.Append(CCFLAGS=["-Os"])
-        env.Append(LINKFLAGS=["-Os"])
+        if methods.using_emcc(env):
+            env.Append(CCFLAGS=["-Oz"])
+            env.Append(LINKFLAGS=["-Oz"])
+        else:
+            env.Append(CCFLAGS=["-Os"])
+            env.Append(LINKFLAGS=["-Os"])
     elif env["optimize"] == "debug":
         env.Append(CCFLAGS=["-Og"])
         env.Append(LINKFLAGS=["-Og"])