What's the magic of linking against iconv (clang/gcc5)?

[Dennis Glatting]

Thanks. I'll give it a shot.



On Tue, 2015-07-14 at 20:03 +0200, Tijl Coosemans wrote:
> On Tue, 14 Jul 2015 09:40:29 -0700 Dennis Glatting <freebsd at pki2.com> wrote:
> > My system:
> > 
> > root at Tasha# uname -a
> > FreeBSD Tasha 10.2-BETA1 FreeBSD 10.2-BETA1 #0 r285434: Sun Jul 12
> > 16:57:18 PDT 2015
> > root at Tasha:/disk-2/obj/disk-1/src/sys/SMUNI-FreeBSD10-amd64  amd64
> > 
> > 
> > I have a very simple program:
> > 
> > #include <iconv.h>
> > #include <stdio.h>
> > 
> > int
> > main( void ) {
> > 
> >   iconv_t fd = 0;
> > 
> >   iconv_close( fd );
> > 
> >   return 0;
> > }
> > 
> > 
> > If I compile with clang, I have no trouble:
> > 
> > root at Tasha# cc foo.c
> > root at Tasha# 
> > 
> > However, if I compiler with gcc5:
> > 
> > root at Tasha# gcc5 foo.c
> > /tmp//ccDHDghd.o: In function `main':
> > foo.c:(.text+0x18): undefined reference to `libiconv_close'
> > collect2: error: ld returned 1 exit status
> > 
> > According to iconv(3), I should link against c yet I get the same error:
> > 
> > root at Tasha# gcc5 foo.c -lc
> > /tmp//ccsKwlf3.o: In function `main':
> > foo.c:(.text+0x18): undefined reference to `libiconv_close'
> > collect2: error: ld returned 1 exit status
> > 
> > I'm confused why this doesn't work and have searched through the system
> > libraries. (I have verbose output below). I /only/ have a problem with
> > iconv. There is some difference between these compilers that I do not
> > understand. 
> > 
> > Clue please.
> 
> The lang/gcc* ports always compile with -I/usr/local/include, so they
> end up including /usr/local/include/iconv.h which belongs to libiconv
> while clang includes /usr/include/iconv.h.  So with gcc you either
> have to link with -liconv or compile with -DLIBICONV_PLUG which makes
> /usr/local/include/iconv.h behave like /usr/include/iconv.h.
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