On Tuesday, November 16, 2010 09:58:48 Detlev Zundel wrote: > > On Monday, November 15, 2010 07:13:03 Sebastien Carlier wrote: > >> On 2010-11-15 11:54:07, Wolfgang Denk wrote: > >> > I notice that the patch affects the size of the resulting U-Boot > >> > images. > >> > > >> > For example: > >> > > >> > Configuring for MiniFAP - Board: TQM5200, Options: MINIFAP > >> > > >> > text data bss dec hex filename > >> > > >> > 358144 35208 303248 696600 aa118 ./u-boot before > >> > 361340 35824 303332 700496 ab050 ./u-boot after > >> > > >> > ------------------------------- > >> > > >> > Delta: +3896 Bytes > >> > > >> > For other boards it's only a few hundred bytes, but why do we see > >> > such big increase here? > >> > >> In this case, these libraries contribute 3260 bytes in unused > >> definitions: > >> > >> In each case, a whole object file contains exactly the unused > >> definitions, and could be excluded in the respective Makefile. > > > > or just use -ffunction-sections/-fdata-sections/-Wl,--gc-sections and > > dont worry about it. which is what we do for the Blackfin port. > > If you do worry, you can use the "--gc-sections" together with > "--print-gc-sections" to actually find out what is unused[1].
the u-boot.map also mentions which input sections are discarded without needing --print-gc-sections ... -mike
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