Linking in C++ mode

[John Levon]

We have a C program which links to a C++ library, and we need to
tell automake to do the link in C++ mode  to avoid undefined references
to the C++ standard library. How can we do it ?

The Makefile.am looks as follows :

---snip---
dist_sources = oprofiled.c opd_stats.c opd_kernel.c opd_image.c 
opd_sample_files.c \
        opd_image.h opd_printf.h opd_stats.h opd_kernel.h opd_sample_files.h 
p_module.h
 
EXTRA_DIST = $(dist_sources)
 
if kernel_support
 
AM_CPPFLAGS=-I ${top_srcdir}/libabi -I ${top_srcdir}/libutil -I 
${top_srcdir}/libop -I ${top_srcdir}/libdb
 
bin_PROGRAMS = oprofiled
 
oprofiled_SOURCES = $(dist_sources)
 
if enable_abi
oprofiled_LDADD = ../libabi/libabi.a ../libdb/libdb.a ../libop/libop.a 
../libutil/libutil.a
else
oprofiled_LDADD = ../libdb/libdb.a ../libop/libop.a ../libutil/libutil.a
endif
 
endif
---snip---

libabi is the C++ library. It would be good to have a solution that
works for automake 1.5 upwards ...

(also, what is the "preferred" way to add a C/C++ flag from configure.in
?)

thanks
john