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On Sat, 17 Dec 2005, Dan Kegel wrote: > On 12/17/05, Robert P. J. Day <rpjday@mindspring.com> wrote: > > just out of curiosity, i modified the standard build script and, > > in the glibc configure stage, i changed "--enable-kernel=2.4.3" to > > 2.6.0, and bad things happened when i was trying to build for > > linuxthreads. > > > > what is the purpose of that option, and should i be able to change > > it to 2.6.0? > > R, as they say, TFM: > http://www.gnu.org/software/libc/manual/html_node/Configuring-and-compiling.html oh, i'm well aware of what the words *say*, i'm just not sure what they *mean* in terms of actual code generation or how one should choose that value. for instance, in building the glibc library, crosstool-0.38 uses a value of "--enable-kernel=2.4.3" for what are apparently historical reasons. ok, fine. after i applied my recently-submitted patches to handle gcc-4.0.2 and glibc-2.3.6, i tried to build an SH3eb toolchain after setting "--enable-kernel=2.6.0" just for fun. that didn't work well at all: ============================================== ... /home/rpjday/ct/crosstool-0.38/build/sh3eb-unknown-linux-gnu/gcc-4.0.2-glibc-2.3.6/gcc-core-prefix/lib/gcc/sh3eb-unknown-linux-gnu/4.0.2/../../../../sh3eb-unknown-linux-gnu/bin/ld: /home/rpjday/ct/crosstool-0.38/build/sh3eb-unknown-linux-gnu/gcc-4.0.2-glibc-2.3.6/build-glibc/rt/librt_pic.a(clock_nanosleep.os)(.text): unresolvable relocation against symbol `__librt_multiple_threads@@GLIBC_PRIVATE' /home/rpjday/ct/crosstool-0.38/build/sh3eb-unknown-linux-gnu/gcc-4.0.2-glibc-2.3.6/gcc-core-prefix/lib/gcc/sh3eb-unknown-linux-gnu/4.0.2/../../../../sh3eb-unknown-linux-gnu/bin/ld: final link failed: Nonrepresentable section on output collect2: ld returned 1 exit status make[2]: *** [/home/rpjday/ct/crosstool-0.38/build/sh3eb-unknown-linux-gnu/gcc-4.0.2-glibc-2.3.6/build-glibc/rt/librt.so] Error 1 make[2]: Leaving directory `/home/rpjday/ct/crosstool-0.38/build/sh3eb-unknown-linux-gnu/gcc-4.0.2-glibc-2.3.6/glibc-2.3.6/rt' make[1]: *** [rt/install-lib] Error 2 make[1]: Leaving directory `/home/rpjday/ct/crosstool-0.38/build/sh3eb-unknown-linux-gnu/gcc-4.0.2-glibc-2.3.6/glibc-2.3.6' make: *** [install-lib-all] Error 2 ... ============================================== on the other hand, when i used my mini script to build the same toolchain with NPTL instead of linuxthreads, it seemed to work just fine. i'm just about to take a closer look at this, but is there any reason that suddenly changing that glibc configuration value should make crosstool fail? would anyone else like to take a working configuration for crosstool-0.38 and try to build it again after setting "--enable-kernel=2.6.0" and see what happens? rday ------ Want more information? See the CrossGCC FAQ, http://www.objsw.com/CrossGCC/ Want to unsubscribe? Send a note to crossgcc-unsubscribe@sources.redhat.com
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