Ian Lance Taylor-3 wrote: > > FloofLeBo <bluswedshooz@xxxxxxxx> writes: > >> And now I'll go to the dead-stripping. How can I be sure that unused code >> from the external and internal static libraries is not shipped with the >> shared object ? >> >> I tried naively to add the "-Wl,-dead-strip" to the gcc -shared command, >> but >> this gave me the warning: >> >> /usr/bin/ld: warning: cannot find entry symbol ad-strip; defaulting to >> 0000000000071f00 >> >> What would gcc need to only pull needed code for the static libs ? > > Neither the GNU linker nor gold support an option -dead-strip. That is > two options: -d, and -e ad-strip. Hence the warning. They both support > an option --gc-sections, which tells them to discard sections that are > not needed. To use that to full effect, you need to compile with > -ffunction-sections -fdata-sections. So this will look like > > gcc -ffunction-sections -fdata-sections -c file.cc > gcc -o file file.o -Wl,--gc-sections > > Ian > > Ok, I adapted all my projects makefiles, and recompiled my external static libs with -ffunction-sections and -fdata-sections. The shared object did drop from 4.3MB to 3.0MB. Nice! Nevertheles a new problem appeared. One of the external libraries i use now causes ld to segfault. How can I debug that ? It's one of the biggest external libs I use, and I think I use < 20% of it ... Again, thanks for your help & kind regards Florent. -- View this message in context: http://old.nabble.com/Shared-library-linking-with-external-static-libraries.-tp29941925p29951444.html Sent from the gcc - Help mailing list archive at Nabble.com.
