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Turn off exceptions to reduce binary size (-600KB for arm64) #1033

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merged 2 commits into from
Jul 16, 2018

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Adlai-Holler
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@Adlai-Holler Adlai-Holler commented Jul 16, 2018

We don't currently use exceptions so we don't need the extra binary to support them.

-fno-exceptions removes unwind tables and makes C++ STL put "abort" wherever there would be an exception.
-fno-objc-arc-exceptions removes code that ARC adds to prevent leaks in the case of exceptions https://clang.llvm.org/docs/AutomaticReferenceCounting.html#exceptions

How big is the win?

  • In terms of total o-file size, the framework goes from 33.3MB to 31.5MB for ARM64 release builds.
  • In terms of executable size, the CatDealsCollectionView ARM64 release binary goes from 12.3MB to 11.7MB.

So modulo any Apple fiddling with your binary, the 64-bit one should shrink by about 600KB.

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ghost commented Jul 16, 2018

🚫 CI failed with log

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The CI is just plain broken =/

@@ -30,7 +30,7 @@
#define ASSetDebugName(node, format, ...) node.debugName = [NSString stringWithFormat:format, __VA_ARGS__]
#define ASSetDebugNames(...) _ASSetDebugNames(self.class, @"" # __VA_ARGS__, __VA_ARGS__, nil)
#else
#define ASSetDebugName(node, name)
#define ASSetDebugName(node, format, ...)
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This was breaking release builds. I guess nobody uses this macro!!

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Strong win!

@appleguy appleguy changed the title Turn off exceptions to reduce binary size Turn off exceptions to reduce binary size (-600KB for arm64) Jul 16, 2018
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Nice!

@Adlai-Holler Adlai-Holler merged commit 6ed5ba2 into master Jul 16, 2018
@Adlai-Holler Adlai-Holler deleted the AHNoExceptions branch July 16, 2018 16:38
mikezucc pushed a commit to mikezucc/Texture that referenced this pull request Oct 2, 2018
…Group#1033)

* Turn off exceptions to reduce binary size

* Changelog
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4 participants