Re: [Libcdio-devel] Making libcdio with MinGW

[Scott Peterson]

Thanks. OK, I've got libcdio to compile with MinGW but now I've got a new problem. I have a Visual Studio project which links to libcdio and when I try to compile it, I get these errors:

error LNK2019: unresolved external symbol __alloca referenced in function _mmc_mode_sense    
libcdio.a    
error LNK2019: unresolved external symbol _snprintf referenced in function _mmc_audio_read_subchannel    libcdio.a

Do you know what libraries I need to include to get __alloca and _snprintf? I tried 
msvcrt.lib (which is where I though _snprintf was) but it didn't work.

On 8/5/07, R. Bernstein <address@hidden > wrote:

Scott Peterson writes:
> I'm trying to compile libcdio-0.78.2 with MinGW. Autoconf runs fine, but
> when I run make, I get this:
>
> > _cdio_generic.c:45:25: cdio/sector.h: No such file or directory
>
> followed by a few other "No such file" errors for a few other headers, and
> then a load of errors which I guess are the result of the unfound headers. I
> have those header files in the proper location, but why doesn't make find
> them? Anyone have any ideas?
>

I may as well put in a plug for the GNU Make debugger, remake
(http://bashdb.sf.net/remake), since that's in fact what I just used
to help me see how things work when they do work.

In the session below, I first removed the object I wanted to have
"make" rebuild.  I then ran the GNU make debugger "continue"ing up to
that target I'm interested in. (One could also set a breakpoint or
"next" until you get to the right target)

Then I get the command that's about to be run and examine variables
which make up that command and the part of that command that contains
the includes flags that are needed here. I selected variable INCLUDE
because I happen to suspect that this is where to look. But if I
didn't I'd just "print" or "expand" the variables one at a time.

All of this tells me that the proper include is set by LIBCDIO_CFLAGS
on line 217 of the libcdio/lib/driver/Makefile which really comes from
line 106 of lib/driver/Makefile.am:

  INCLUDES = $(LIBCDIO_CFLAGS)

Also, top_srcdir has to be set properly.

$ cd libcdio/lib/
$ rm _cdio_generic.o

remake -X _cdio_generic.o
Reading makefiles...
(:0):
expr 8 - 1
Updating makefiles....

(libcdio/lib/driver/Makefile:426)
Makefile.in:
mdb<0> c _cdio_generic.o
Updating goal targets....
File `_cdio_generic.o' does not exist.
Must remake target `_cdio_generic.o'.

(/src/external-cvs/libcdio/lib/driver/Makefile:524)
_cdio_generic.o: _cdio_generic.c _cdio_generic.c ../../config.h ...
mdb<1> t @ commands

_cdio_generic.o:
#  commands to execute (from `Makefile', line 525):
   if $(COMPILE) -MT $@ -MD -MP -MF "$(DEPDIR)/$*.Tpo" -c -o $@ $<; \
   then mv -f "$(DEPDIR)/$*.Tpo" "$(DEPDIR)/$*.Po"; else rm -f "$(DEPDIR)/$*.Tpo"; exit 1; fi

mdb<2> p COMPILE
Makefile:116 (origin: makefile) COMPILE = $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
mdb<3> p INCLUDES
Makefile:360 (origin: makefile) INCLUDES = $(LIBCDIO_CFLAGS)
mdb<4> p LIBCDIO_CFLAGS
Makefile:217 (origin: makefile) LIBCDIO_CFLAGS = -I$(top_srcdir)/lib/driver -I$(top_srcdir)/include/
mdb<5> p top_srcdir
Makefile:64 (origin: makefile) top_srcdir = ../..



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-- 
Scott.