Re: useful bug reports

[Harald Dunkel]

Hi Ralf,

Ralf Wildenhues wrote:
> 
> Harald, please consider *providing more and useful information* if you
> want help.  I for one can't read your mind, and almost every first post
> of yours leaves me wanting for a crystal ball as to what has gone wrong.
> This makes me for one be less and less enthusiastic about replying.
> With newbies, or people where I do not know whether they are newbies or
> not, one cannot expect more, at least the first couple of times they
> post.  But you bee given hints before.  This is no service hotline.
> I heartily recommend reading this (available in several languages):
> http://www.chiark.greenend.org.uk/~sgtatham/bugs.html
> 
> We have now again wasted 5 messages without getting to the point of the
> problem you encounter: I still have no clue what's going wrong on your
> side, and I bet you aren't happy about the situation either.
> 

Sorry for not being more precise.

Here is a sample.

        #configure.ac:
        AC_INIT(package,version)
        AC_CONFIG_AUX_DIR([.])
        AC_CANONICAL_HOST
        AM_INIT_AUTOMAKE([foreign subdir-objects no-define])

        AC_PROG_CC
        AC_PROG_CPP
        AC_AIX
        AC_ISC_POSIX
        AC_MINIX
        AC_PROG_INSTALL
        AC_PROG_CXX
        AC_PROG_CXXCPP
        AC_PROG_RANLIB
        AC_HEADER_STDC
        AM_PROG_CC_C_O
        AM_PROG_LEX
        AC_PROG_YACC

        AC_CONFIG_FILES([Makefile])
        AC_OUTPUT



        #Makefile.am:
        noinst_PROGRAMS = hello
        hello_SOURCES = hello.cxx


Autoconf is 2.59, plus Stepan's patch for c.m4, see attachment
Automake is 1.9.6
platform is Linux
build platform is Windows, using MSVC 7.1.

The patch provided by Stepan some months ago fixes
AM_PROG_CC_C_O for Windows and MSVC, i.e. configure recognizes
that -c -o doesn't work as expected for Bill Gates' compiler.
Looking into the generated Makefile I see

        CC = /somedir/compile cl.exe

The compile script is necessary for both C and C++ code. But
it is not copied by Automake. Nor does it set CXX accordingly.
in the Makefile.

The patch I had sent was an attempt to workaround the problem,
but it is not sufficient. Any help would be highly appreciated.


Regards

Harri

--- Begin Message --- Subject: Re: AC_PROG_CC_C_O doesn't work with VC++ Date: Fri, 1 Jul 2005 12:58:16 +0200 User-agent: Mutt/1.4.1i

Hello,

On Fri, Jul 01, 2005 at 10:14:28AM +0200, Harald Dunkel wrote:
> It seems that AC_PROG_CC_C_O does not work with Microsoft's
> Visual C++ 13.10.3077.
[...]
>       cl -c -o somedir/conftest.obj conftest.c
> or
>       cl -c -o xyz.obj conftest.c
> 
> do not work as expected. cl silently ignores the -o
> option if there is a -c.

the patch attached to this mail (relative to current autoconf CVS)
should fix it.

OK to commit?

> How can I tell autoconf to not use -c and -o together,
> regardless what the test said?

Do I guess correctly that you in fact use AM_PROG_CC_C?
Then the following hack should work:

AC_PROG_CC_C_O
eval ac_cv_prog_cc_${ac_cc}_c_o=no
AM_PROG_CC_C_O

(The configure output still says that -c -o works, and NO_MINUS_C_MINUS_O
is not defined in your config.h, but it doesn't matter.)

Have a nice day,
        Stepan

autoconf-20050701-cc-c-o.patch
Description: Text document

--- End Message ---