[cfe-dev] Binary size when using std::function with lambda expression

[Shoaib Meenai via cfe-dev]

libcxx-dev at lists.llvm.org<mailto:libcxx-dev at lists.llvm.org> might be a good place to send this as well, since it’s possible it’s a libc++ thing.

From: cfe-dev <cfe-dev-bounces at lists.llvm.org> on behalf of cfe-dev <cfe-dev at lists.llvm.org>
Reply-To: Cyril Makloufi <Cyril.Makloufi at 4d.com>
Date: Friday, January 8, 2021 at 2:45 AM
To: cfe-dev <cfe-dev at lists.llvm.org>
Subject: [cfe-dev] Binary size when using std::function with lambda expression


Hello,



When using std::function instead of function pointer (see the sample of code) on Mac, we get a huge difference between size of generated binary (80ko when using function pointer and 157ko whit std::function).

I use Xcode to build debug with -O0 -std=gnu++14 and libc++.

It doesn't seem to have the same result on windows or linux.

Is it something normal ?



Here's the code sample :



#include <iostream>

#include <functional>





int main(int argc, const char * argv[]) {

    std::function<void()> f = [](){std::cout << "LOG2\n";};

//    void (*f)() = [](){std::cout << "LOG3\n";};



    f();



    return 0;

}




Thanks,

Cyril
[cid:image001.jpg at 01D6E5A0.4DC9D7D0]
Cyril Makloufi
Développeur

Email :
Cyril.Makloufi at 4d.com<mailto:Cyril.Makloufi at 4d.com>
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