On 03/23/2016 02:21 PM, John Paul Adrian Glaubitz wrote: > dietlibc currently fails to build from source on powerpcspe because the code > is missing FPU emulation: > [...] > __dtostr.c:(.text+0xc0): undefined reference to `__unorddf2' > __dtostr.c:(.text+0x110): undefined reference to `__unorddf2' > collect2: error: ld returned 1 exit status > make: *** [build-stamp] Error 1 > debian/rules:54: recipe for target 'build-stamp' failed > > "__unorddf2" is a function in the FPU emulation library present in glibc. In > the past, the FPU emulation code was present in libgcc which is why dietlibc > used to build find on powerpcspe. However, the FPU emulation code in gcc > has been deprecated in favour of the code present in glibc 2.19 or newer > and any recent version of gcc built on a system with glibc 2.19 or newer > will automatically deactivate its built-in FPU emulation code.
I've now ported most of glibc's FPU emulation support for e500 CPUs to dietlibc. (What I didn't port were functions that dietlibc doesn't implement at all, such as all the <fenv.h> functions, because libm stuff is mostly not implemented in dietlibc yet; for example, even sqrt() only works on i386 at the moment, see #706327.) I've test-compiled dietlibc with my patch in a qemu-user ppcspe chroot, and it doesn't FTBFS anymore. Also, I tried a small test program that converts a string to a double, does a bit of trivial arithmetic with it and outputs the result via printf - and that worked as expected. I've pushed this to the ports/ppcspe branch in dietlibc's collab-maint git packaging repository: https://anonscm.debian.org/cgit/collab-maint/dietlibc.git/log/?h=ports/ppcspe Clone via: git clone https://anonscm.debian.org/git/collab-maint/dietlibc.git -b ports/ppcspe As I don't have access to any real hardware, it would be nice if you could test-build it (gbp works). It would also be great that if it does indeed work, you could try to then build the current src:mksh from unstable with dietlibc-dev installed, to see if there are any regressions. Regards, Christian
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