g++ executable size

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2 total messages Started by Ed Barton Wed, 29 Jul 1992 09:27

#127

Author: Ed Barton
Date: Wed, 29 Jul 1992 09:27

9 lines
809 bytes

As has often been noted, g++ 2.2.2 on the IBM RS/6000 produces
enormous executables.  This appears to result from the generation of
multiple local copies of various method functions.  Are there any
tricks for reducing this effect, such as by turning on some linker
flag in the second link phase only that would allow the linker to
garbage-collect most of the local copies?  Are there any undocumented
flags that allow greater control over the generation of these possibly
duplicated copies, as is possible in many PC products?

Re: g++ executable size

#128

Author: Joe Buck
Date: Wed, 29 Jul 1992 20:05

21 lines
1403 bytes

In article <EB.92Jul29092745@ascent.ascent.com> eb@ascent.com (Ed Barton) writes:
>As has often been noted, g++ 2.2.2 on the IBM RS/6000 produces
>enormous executables.  This appears to result from the generation of
>multiple local copies of various method functions.  Are there any
>tricks for reducing this effect, such as by turning on some linker
>flag in the second link phase only that would allow the linker to
>garbage-collect most of the local copies?  Are there any undocumented
>flags that allow greater control over the generation of these possibly
>duplicated copies, as is possible in many PC products?

Read the "man page", g++.1 in the distribution.  The most effective
technique is to use #pragma interface and #pragma implementation.
This will result, if done right, in only one copy of each class's
virtual function table and only one copy of each inline function that
has to be "outlined".  Their use is explained in the man page.

--
Joe Buck	jbuck@ohm.berkeley.edu

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