Date: Tue, 6 Dec 2022 11:36:24 +0100 From: Yuriy Chernyshov <georgthegreat@...il.com> To: musl@...ts.openwall.com Subject: Various conflicts with linux system headers (ioctl.h) Hello, I am trying to build DBMS software (ydb from https://github.com/ydb-platform/ydb) with musl-libc. So far, I have run into certain problems. As YDB uses ioctl.h, it has to include both ioctl.h and certain headers from linux/ itself. This gives me a bunch of conflicts around _IOC macros family being defined by both: The error looks as follows: contrib/libs/musl/arch/generic/bits/ioctl.h:7:9: error: '_IOW' macro > redefined [-Werror,-Wmacro-redefined] > #define _IOW(a,b,c) _IOC(_IOC_WRITE,(a),(b),sizeof(c)) > ^ > contrib/libs/linux-headers/asm-generic/ioctl.h:90:9: note: previous > definition is here > #define _IOW(type,nr,size) > _IOC(_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size))) > The following workaround helps, but looks quite ugly: --- arch/generic/bits/ioctl.h (b4624b83eafbdd5f2e2c37374d62426c27687f35) > +++ arch/generic/bits/ioctl.h (d545cbc1ae3f5c9132eb26b176bef3638c9d8063) > @@ -1,3 +1,9 @@ > +#undef _IO > +#undef _IOC > +#undef _IOR > +#undef _IOW > +#undef _IOWR > + > #define _IOC(a,b,c,d) ( ((a)<<30) | ((b)<<8) | (c) | ((d)<<16) ) > #define _IOC_NONE 0U > #define _IOC_WRITE 1U > Is it possible to get official solution for the macro conflict? NB: we have to use linux/fs.h in order to get BLKGETSIZE64 constant defined which is missing in sys/ioctl.h. Another conflict is in NGROUPS_MAX value: musl sets it to 32, while Linux itself (starting from 2.6.4, which is below the minimal version recommended by musl) sets it to 65536. It would be nice to have this value increased in musl itself. Regards, Yuriy. Content of type "text/html" skipped
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