Messages in this thread | | | Subject | Re: Assembler warnings 2.2.12 | Date | Mon, 30 Aug 1999 16:57:44 -0400 | From | Horst von Brand <> |
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nbecker@fred.net said: > Has anyone else seen this? > > i686-pc-linux-gnu > > gcc --version > 2.9-codefusion-990706 > > make[1]: Entering directory `/usr/src/linux-2.2.12/fs' > gcc -D__KERNEL__ -I/usr/src/linux-2.2.12/include -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -fno-strict-aliasing -pipe > -m486 -malign-loops=2 -malign-jumps=2 -malign-functions=2 -DCPU=686 -DMODULE -c -o binfmt_aout.o binfmt_aout.c > {standard input}: Assembler messages: > {standard input}:1019: Warning: using `%eax' instead of `%ax' due to `l' suffix > {standard input}:1019: Warning: using `%eax' instead of `%ax' due to `l' suffix
> Is this a linux-kernel problem, or a gcc problem? Or maybe not a > problem?
I've send a fix for this (and assorted other warnings) to Alan Cox, which for the case under discussion (and similar ones) was rejected by Linus in the end. The trouble is that the "right" way to handle this is to change the %ax et al to %eax and family, or use the "w" forms of the affected instructions. New binutils (current betas) handle these changes right, older ones generate idiotic code for them (unneeded prefixes, AFAIR). With what is in the kernel right now, new binutils generate the right code and complain, older ones generate the right code and keep quiet.
Will have to wait... -- Dr. Horst H. von Brand mailto:vonbrand@inf.utfsm.cl Departamento de Informatica Fono: +56 32 654431 Universidad Tecnica Federico Santa Maria +56 32 654239 Casilla 110-V, Valparaiso, Chile Fax: +56 32 797513
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