-flto with -fwhole-program or -fuse-linker-plugin
Hei Chan
structurechart@yahoo.com
Wed Mar 20 04:28:00 GMT 2013
Hi,
I am reading:
http://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html
It first suggests:
In combination with -flto using this option(-fwhole-program) should not be used. Instead relying on a linker plugin should provide **safer and more precise information.**
And then, it suggests:
If the program does not require any symbols to be exported, it is possible to combine -flto and -fwhole-program to allow the interprocedural optimizers to use more aggressive assumptions which may lead to improved optimization opportunities. Use of -fwhole-program is not needed when linker plugin is active (see -fuse-linker-plugin).
Does it mean that in theory, using -fuse-linker-plugin with -flto always gets a better optimized executable than using -fwhole-program with -flto?
Thanks in advance.
Cheers,
Hei
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