remove math code for newlib #11
Conversation
Newlib already have optimized and full featured math implementation. To
use it, one should add:
env['LIBS'] = ['m']
or equivalent to the SConstruct.
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Please provide more generic method to add the math library. Or add it on SConscript of minilibc directly. |
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Hmm, you mean removing the math in minilibc as well? |
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I made a mistaken. No modification in minilibc. It's newlib. After remove math.c, we should point out how to add math library clearly, such as add it in SConscript file of newlib etc. Or we could add it in SConscript directly. If program does not use functions in math library, is the math library removed when linking? We should verify it or provide a good method and not only said '''env['LIBS'] = ['m']'''. |
libm is a frequently used lib. Newlib is compiled with -ffunction-sections in recent GCC tool chains. The linker would just link in the functions that have been referenced. So setting this won't result in bigger text size.
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I've tested both with and without --gc-sections and it seems that link with recent tool chain(4.7_2012q4) won't pour all the libm symbols into the text. So if the program did not use any math functions, it math lib would eliminate eventually. I think it's safe to set My commit 8ad1205 fixed this. |
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OK, I've updated this branch with taking advantage of Merging this branch will merge all the three commits. If you have any problem, feel free to comment ;) |
remove math code for newlib
Newlib already have optimized and full featured math implementation. To
use it, one should add:
or equivalent to the SConstruct.