Re: [gpsd-users] Error while compiling NAN undeclared in gpsdclient.c

[Bas van Duijnhoven]

Gary,

Just a short answer (i'm on my way to bed :)).
your tip worked excellent:
Every file that uses nan.h gives a warning that it is using case 1:

================================
#if __GNUC_PREREQ(3,3)

# define NAN    (__builtin_nanf (""))
#warning "case 1"
================================

I'm no C-expert but it seems to me that NAN is defined by a builtin 
function __builtin_nanf("")
I checked the GCC documentation on this function:
http://gcc.gnu.org/onlinedocs/gcc-4.2.3/gcc/Other-Builtins.html
This function is also supported in the ARM GCC compiler:
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0491c/BABICCBA.html

Next i checked the version of GCC:
=================================
gcc -v
Using built-in specs.
Target: arm-none-linux-gnueabi
Configured with: ../gcc-4.2/configure --build=i386-pc-linux-gnu 
--host=arm-none-linux-gnueabi --target=arm-none-linux-gnueabi 
--prefix=/opt --disable-nls --disable-static 
--with-as=/home/slug/optware/cs08q1armel/toolchain/arm-2008q1/bin/arm-none-linux-gnueabi-as 
--with-ld=/home/slug/optware/cs08q1armel/toolchain/arm-2008q1/bin/arm-none-linux-gnueabi-ld 
--enable-languages=c,c++ --disable-multilib --enable-threads 
--disable-libmudflap --disable-libssp --disable-libgomp 
--disable-libstdcxx-pch --enable-shared --enable-symvers=gnu 
--enable-__cxa_atexit
Thread model: posix
gcc version 4.2.3
=================================
There are two possible problems i can see here:
- the --build= directive specifies an Intel CPU
- the directories defined by --with-as and --with-ld do not exist on my 
QNAP NAS. But i can't find any documentation on these commandline options.

Im stuck, any ideas (anyone?)

gr
Bas

Op 1-5-2012 22:12, Gary E. Miller schreef:
> Yo Bas!
>
> On Tue, 01 May 2012 21:55:20 +0200
> Bas van Duijnhoven<address@hidden>  wrote:
>
> > I've made a full build-log from scons (see below, warning it's
> > lengthy), as you can see there are some warnings and only one error.
> No earlier warnings in gpsdclient.c which is the part we are currently
> looking at.  So nothing enligtening in the log.
>
> Esr may want to double check some of the alignment errors in the json
> code.
>
> > Im still working on figuring out how to determine which NAN define is
> > used, any tips?
> I would put this in each of the if cases:
>         #warning "case X"
>
> Where X is 1, 2, 3, etc.  That will emit a warning during compile so you
> can see what your ifdefs are doing.
>
> RGDS
> GARY
> ---------------------------------------------------------------------------
> Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97701
>         address@hidden  Tel:+1(541)382-8588