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Re: GCC 3.4.3 static constants, named sections, and -fkeep-static-consts

From: James E Wilson <wilson at specifixinc dot com>
To: Gary Funck <gary at intrepid dot com>
Cc: gcc at gcc dot gnu dot org
Date: Tue, 08 Mar 2005 18:59:03 -0800
Subject: Re: GCC 3.4.3 static constants, named sections, and -fkeep-static-consts
References: <JCEPIPKHCJGDMPOHDOIGMEJLCNAA.gary@intrepid.com>

Gary Funck wrote:

When compiled with GCC 3.4.3, at -O2, the ident string above will _not_
appear in the executable.  This is apparently expected behavior.

See the docs for __attribute__ ((used)). Contrary to the docs, it works for more than functions.

However, interestingly,
  gcc -fkeep-static-consts -O2 t.c
did not retain the ident string, rcsid, defined above.  Shouldn't
-fkepp-static-consts have ensured that this static constant would appear
in the executable?

Try re-reading the docs. -fkeep-static-consts is the default. The purpose of this is that we don't perform this optimization at -O0 normally, but if you use -fno-keep-static-consts, then we do. So this option can let you remove static consts in extra cases, but will never prevent the compiler from removing them. -- Jim Wilson, GNU Tools Support, http://www.SpecifixInc.com

Follow-Ups:
- RE: GCC 3.4.3 static constants, named sections, and -fkeep-static-consts
  - From: Gary Funck

References:
- GCC 3.4.3 static constants, named sections, and -fkeep-static-consts
  - From: Gary Funck

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