Re: Undefined symbols in 2.6.11-rc5-mm1

From: Adrian Bunk (bunk_at_stusta.de)
Date: 03/05/05

  • Next message: Pierre Ossman: "Re: [PATCH][MMC] Secure Digital (SD) support" 
    Date:	Sat, 5 Mar 2005 14:04:16 +0100
To: Kai Germaschewski <kai.germaschewski@unh.edu>

    On Sat, Mar 05, 2005 at 12:09:29AM -0500, Kai Germaschewski wrote:
    > On Fri, 4 Mar 2005, Adrian Bunk wrote:
    >
    > > > [...] So ld looks into the lib .a archive, determines that none of
    > > > the symbols in that object file are needed to resolve a reference and
    > > > drops the entire .o file.
    >
    > > Silly question:
    > > What's the advantage of lib-y compared to obj-y?
    >
    > Basically exactly what I quoted above -- unused object files don't get
    > linked into the kernel image and don't take up (wasted) space. On the
    > other hand, files in obj-y get linked into the kernel unconditionally.

    And this can break as soon as the "unused" object files contains
    EXPORT_SYMBOL's.

    Is it really worth it doing it in this non-intuitive way?
    I'd prefer an explicite dependency on a variable if you want to
    compile library functions conditionally.

    > --Kai

    cu
    Adrian 

    -- 
       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed
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