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Re: Precompiled headers [message #44236 is a reply to message #44235]

Wed, 04 February 2015 08:33

mirek
Messages: 14267
Registered: November 2005

Ultimate Member

chickenk wrote on Tue, 03 February 2015 20:47

mirek wrote on Sun, 18 January 2015 11:49
by combining all files into single object file, linker has less oportunity to remove unused code. This leads to (sometimes significantly) larger executable binaries. For this reason, we do not recommend (and have off by default) BLITZ for release builds and if possible, we use precompiled headers for release builds.

At least for GCC, your experiments would lead me to use BLITZ for release builds, with the following options:
-ffunction-sections -fdata-sections -Wl,--gc-sections
Best of BLITZ, with much more unused code removed!

Anyway thanks for working on PCH.

Well, at the time I was testing these options, it did not make noticeable impact on code size (in short, they did not appeared to work). BTW, note that these options are part of standard installation.

You can check: build release (e.g. theide) with BLITZ and these options, then build without BLITZ, report the size...

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