Date: Tue, 9 Apr 2013 22:15:40 +0200 From: meres5@...ha.tmit.bme.hu To: musl@...ts.openwall.com Subject: Re: vfprintf.c:(.text+0xc6c): undefined reference to `__signbitl' Hi! I have good, and bad news concerning this issue! > > this is bad, it is 'double-double' long double format > which means broken long double arithmetics > Its the out of the box debian, installed on our old IBM eServer pSeries 615 (7029 6C3). Surprisingly a native PPC host/target/and everything. . . > if you want to play with static linking then it's better > not to use soft-float long double, that ruins it a lot Well, we won't made any REAL (floating point) thing on this old machine. Performance is not an issue here. > (every trivial program will get an entire floating point > emulation library linked in from libgcc pulled in by printf > so the students will get the impression that static linking > always gives bloated binaries..) The picture is not that bad. Finally I managed to unleash the two functions in question in ~/src/musl-0.9.9/src/math: __signbitl and __fpclassifyl with some #if bombing and voilla! root@...ha:/home/meres5/tmp# ld crt1.o stdhello.o -L. -lc -lgcc -o stdhello root@...ha:/home/meres5/tmp# chroot . ./stdhello Hello worked and its 'only' 25k. > the correct thing to do is to build a toolchain with 64bit > long double I won't touch the Debian tool chain. . . We are on PPC and not cross compiling for PSP3 :-) >> Anyway, it's been 19 years passed, so my guide seemed not so >> durable. >> Also Linux dropped the concept of static linking in practivce. >> Goodby kiss to > > linux did not drop it, but for some reason the glibc and > binutils maintainers thought that dynamic linking is always > better so it's enough to support that Yep. Finally I got it - thanks for the MUSL team! And the good news: - worked - I have checked several other libc for embedded, supporting static ld and only musl prevails with some really little hack in source. Others claimed broken tool-chain (by being surprised not in a cross compling toolchain) Bad news: - Someone had better to have a look at those conditionals in __signbitl.c and __fpclassifyl.c Regards m5
Powered by blists - more mailing lists
Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.