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From: | Nick Clifton |
Subject: | Re: Ask for helping about LD linker |
Date: | Mon, 02 Jun 2008 09:35:44 +0100 |
User-agent: | Thunderbird 1.5.0.12 (X11/20080213) |
Hi Jian,
But how to remove the unused functions in system library(maybe compile the system library without --funciton-sections) when linking program.
Short Answer: It cannot be done. Long Answer:If you are linking against a *shared* library then you will not be able to remove any functions in the shared library. (Nor would you want to - other programs may need those functions).
If you are linking against a *static* system library (which has not been compiled with --ffunction-sections), then unused functions should not normally be copied into the executable. The exception is when an unused function is in the same object file inside the library as a used function (or used global symbol). Ie the linker only discards code at the object file level. If some part of an object file inside a static library is needed by the executable then the entire contents of that object file will be copies into the executable.
Cheers Nick
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