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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