line numbers not always reported

[Steve M. Robbins]

Hi,

I tested this with automake 1.4s, from CVS head as of a few minutes
ago.

If a bogus variable is assigned to, automake emits the line number
with the diagnostic.

        address@hidden Makefile.am
        CGAL_LDFLAGS =

        bin_PROGRAMS = foo
        LDADD = $(CGAL_LDFLAGS)

        foo_SOURCES = foo.c

        address@hidden --foreign
        Makefile.am:1: invalid unused variable name: `CGAL_LDFLAGS'


However, if we remove the first line, and just use the variable,
the line numbers vanish.

        address@hidden Makefile.am
        #CGAL_LDFLAGS =
        
        bin_PROGRAMS = foo
        LDADD = $(CGAL_LDFLAGS)

        foo_SOURCES = foo.c
        address@hidden --foreign
        Makefile.am: invalid unused variable name: `CGAL_LDFLAGS'


For completeness, here is the configure script.

        address@hidden configure.ac 
        AC_INIT(Makefile.am)
        AM_INIT_AUTOMAKE(goof, 0.1.0)

        dnl Checks for programs.
        AC_PROG_INSTALL
        AC_PROG_CC

        AC_OUTPUT(Makefile)


-Steve

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