Date: Tue, 2 Jun 2015 13:24:11 +0200 From: Szabolcs Nagy <nsz@...t70.net> To: musl@...ts.openwall.com Subject: Re: time.h define NULL * Tomasz Sterna <tomek@...oka.com> [2015-06-02 13:16:31 +0200]: > Dnia 2015-06-02, wto o godzinie 11:35 +0200, Szabolcs Nagy pisze: > > > Why does time.h unconditionally define NULL ? > > because it is required > > Required by what? > c11 7.27.1p2 > > > /usr/include/time.h:11:9: warning: 'NULL' macro redefined > > > [-Wmacro-redefined] > > > #define NULL 0L > > > ^ > > what is the previous definition? > > and why is that conflicting? > > Previous definition is: > #define NULL (0) > > it is in one of headers of the application I'm trying to build against > musl. > that's undefined behaviour NULL is reserved for the implementation if time.h is included. c11 7.1.3 > Even if it is required by time.h, shouldn't it be guarded by #ifndef > NULL? time.h is not stand-alone unit and is designed to be included to > other software. no
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