Re: CXXFLAGS and linking

[Guido Draheim]

William S Fulton schrieb:
> Guido Draheim wrote:
>
> > William S Fulton schrieb:
> >
> > > I see that CXXFLAGS and AM_CXXFLAGS gets passed to the linker 
> > > ($CXXLINK). This doesn't seem correct as the C++ flags aren't 
> > > necessarily appropriate for linking. This isn't consistent with the 
> > > per-program xxxx_CXXFLAGS which do not get passed to the linker. Is 
> > > this all as intended?
> >
> > your version of autotools? (autoconf, automake, libtool)
> Sorry, the latest... Automake 1.7.2, Autoconf 2.57, m4 1.4 (I'm not 
> using libtool).
>
> Perhaps to make it clearer, the following simple test case demonstrates 
> the problem:
>
> -------------------------------------------
> configure.in:
> -------------------------------------------
> AC_INIT([test], [1.0])
> AC_PREREQ(2.57)
> AC_CONFIG_SRCDIR([foo.cxx])
> AM_INIT_AUTOMAKE
> AC_PROG_CXX
> AC_CONFIG_FILES([ Makefile ])
> AC_OUTPUT
>
> -------------------------------------------
> Makefile.am:
> -------------------------------------------
> AUTOMAKE_OPTIONS = foreign
> AM_CXXFLAGS =    -DSOMETHING
> test_SOURCES =     foo.cxx
> bin_PROGRAMS = test
>
>
> -------------------------------------------
> foo.cxx:
> -------------------------------------------
> #include <iostream>
> using namespace std;
>
> int main()
> {
>     cout << "hi!" << endl;
> }
>
>
> The linker output is then:
>
> g++ -DSOMETHING -g -O2   -o test.exe  foo.o

hmmm, personally I'm using libtool support about everywhere
but it is quite similar....

CCLD = $(CC)
LINK = $(LIBTOOL) --mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) \
        $(AM_LDFLAGS) $(LDFLAGS) -o $@

however, I guess that libtool strips everything away that is
not understood by the actual linker as configured, right?

hth, cheers, guido