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-rw-r--r--platform/javascript/detect.py10
1 files changed, 8 insertions, 2 deletions
diff --git a/platform/javascript/detect.py b/platform/javascript/detect.py
index 8472c3ccab..8c7a904bca 100644
--- a/platform/javascript/detect.py
+++ b/platform/javascript/detect.py
@@ -49,8 +49,14 @@ def configure(env):
## Build type
if (env["target"] == "release"):
- env.Append(CCFLAGS=['-O3'])
- env.Append(LINKFLAGS=['-O3'])
+ # Use -Os to prioritize optimizing for reduced file size. This is
+ # particularly valuable for the web platform because it directly
+ # decreases download time.
+ # -Os reduces file size by around 5 MiB over -O3. -Oz only saves about
+ # 100 KiB over -Os, which does not justify the negative impact on
+ # run-time performance.
+ env.Append(CCFLAGS=['-Os'])
+ env.Append(LINKFLAGS=['-Os'])
elif (env["target"] == "release_debug"):
env.Append(CCFLAGS=['-O2', '-DDEBUG_ENABLED'])