Re: time(2) missing for target i386-elf (corrected)

[Jeff Johnston <jjohnstn at redhat dot com>]

Hmm, the libc/time/time.c code checks for the existence of 
HAVE_GETTIMEOFDAY flag and if not present, it doesn't compile the entire 
time function.  The time function is ANSI and ifdefing it out is wrong. 
 It also doesn't make sense to check for the syscall before calling it 
as it is one of the basic syscalls (stubbed in libnosys to return -1). 
I will fix this.  In your case, you will see time() return -1 when 
libnosys provides the syscall.

-- Jeff J.

John D. Ramsdell wrote:
> [The previous version of the note was sent in error and before
> editing.]
>
> I used the latest newlib along with binutils and gcc to build a
> cross-compiler with a target of i386-elf.  This compiler was used to
> compile Lua <http://www.lua.org>, with the aim of placing it inside an
> operating system that consists only of a Lua intrepreter inside a
> small kernel.  When I linked Lua with libm, libc, and libnosys, there
> was still one undefined symbol, time.  The Lua authors claim time(2)
> is part of ANSI C, however my GNU/Linux manual page says it conforms
> to SVr4, SVID, POSIX, X/OPEN, BSD 4.3.  In any event, is there a
> reason time(2) is not part of the newlib C library?  If the reason is
> simply no one has submitted a patch that adds this functionality, I'll
> gladly supply the code.
>
> John