Date: Thu, 31 Mar 2016 16:35:48 +0200 From: Szabolcs Nagy <nsz@...t70.net> To: musl@...ts.openwall.com Subject: Re: Defining __STDC_ISO_10646__, __STDC_IEC_559__ and so on with musl? * Masanori Ogino <masanori.ogino@...il.com> [2016-03-31 20:34:22 +0900]: > The C standard specifies some predefined macros to determine > implementation-dependent characteristics, e.g. __STDC_ISO_10646__. > However, it seems that those macros are omitted with musl-based > toolchains. (I read cross-musl patches and tested with Gentoo's musl > toolchain.) > > glibc handles them using a small header file named stdc-predef.h and a yes, this is the right approach we just never got around adding it. i think it should contain #if __GCC_IEC_559 > 0 #define __STDC_IEC_559__ 1 #endif #if __GCC_IEC_559_COMPLEX > 0 #define __STDC_IEC_559_COMPLEX__ 1 #endif #define __STDC_ISO_10646__ 201505L > hook to GCC. (glibc has the header separately and GCC treats it > specially since the macros should be defined even if the source code > doesn't include any headers.) > > Could we provide the macros with similar approaches or patches to GCC > to just define them? > i think we don't have to modify gcc, on *-linux* targets t-glibc is included which does the stdc-predef.h include magic. > -- > Masanori Ogino
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