Re: LTLIBOBJS not built when using AC_REPLACE_FUNCS without AC_CONFIG_LIBOBJ_DIR

[Chris Pickett]

Hi Ralf,

Ralf Wildenhues wrote:
> * Chris Pickett wrote on Tue, Dec 23, 2008 at 07:00:08AM CET:
> > I'm trying to use AC_REPLACE_FUNCS to provide strsignal.  However, when  
> > I run make it doesn't build a strsignal.lo for me, and libtool complains  
> > "link: `strsignal.lo' is not a valid libtool object".  This is using the  
> > latest versions of the Autotools on MinGW/MSYS.
>
> > My problem is that I do have the strsignal.c source in the same  
> > directory as the src/Makefile.am but it isn't apparently getting built.  
> > Is this an Automake bug or is it my fault, and if it is my fault, what  
> > am I doing wrong?  Relevant files/file snippets follow.
>
> Not sure; please compare what you are doing differently.

Weird, if I do exactly what you say below it works.  If I use what I 
currently have, it behaves as you say on OS X with 
ac_cv_func_strsignal=no but does not behave that way on MinGW/MSYS: 
strsignal.lo still isn't getting built.

> mkdir src
> cat >configure.ac <<\END
> AC_INIT(a,1)
> AM_INIT_AUTOMAKE(foreign)
> AC_CONFIG_FILES(Makefile src/Makefile)

I have AC_CONFIG_FILES right at the end before AC_OUTPUT, but otherwise 
configure.ac matches well enough.

> AC_PROG_CC
> AC_PROG_LIBTOOL
> AC_REPLACE_FUNCS([strsignal])
> AC_OUTPUT
> END
> echo 'SUBDIRS = src' > Makefile.am
> cat >src/Makefile.am <<\END
> libcheck_la_LIBADD      = @LTLIBOBJS@
> libcheckinternal_la_LIBADD      = @LTLIBOBJS@
> lib_LTLIBRARIES = libcheck.la libcheckinternal.la

libcheckinternal is used for make check only, so I have:

lib_LTLIBRARIES = libcheck.la
noinst_LTLIBRARIES = libcheckinternal.la

> END
> touch src/libcheck.c src/libcheckinternal.c

I don't have these two files, but even if I do touch them it doesn't 
make a difference.  On the other hand they are required for your minimal 
working example.

> autoreconf -vif  # will error out unless src/strsignal.c exists

No errors.

> ./configure ac_cv_func_strsignal=no  # to fake nonexistent function
> make             # will build and link strsignal.lo

I guess I need to do some minimal test case minimization...

Cheers,
Chris