Hi,

I'm having some difficulty finding what I'm looking for on the GNU
documentation site.  Basically, I want to have make exit if a
particular condition is true.  Actually, because there are a few
different compilers installed on the system, I need to make sure the
correct one has been selected and if not, to exit the script and warn
the user.  Something like:

ifeq (${GCC}, "/usr/bin/gcc")
echo "you must configure for compiler XXXXXX"
exit
endif

I can't find an exit command (at least not yet) and I was wondering if
this is possible.  What would the command/directive be?

(NOTE because of how the environment is, it's not trivial to configure
for the right compiler.  Therefore, I want the users to configure
before they call make.)

Thanks,
Andy

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On Jan 26, 4:37 pm, af300...@gmail.com wrote:
> Hi,
>
> I'm having some difficulty finding what I'm looking for on the GNU
> documentation site.  Basically, I want to have make exit if a
> particular condition is true.  Actually, because there are a few
> different compilers installed on the system, I need to make sure the
> correct one has been selected and if not, to exit the script and warn
> the user.  Something like:
>
> ifeq (${GCC}, "/usr/bin/gcc")
>             echo "you must configure for compiler XXXXXX"
>             exit
> endif
>
> I can't find an exit command (at least not yet) and I was wondering if
> this is possible.  What would the command/directive be?
>
> (NOTE because of how the environment is, it's not trivial to configure
> for the right compiler.  Therefore, I want the users to configure
> before they call make.)
Make control functions are described at
[url]http://www.gnu.org/software/make/manual/html_node/Make-Control-Functions.html.[/ur
l]
Take a look at the $(error ...) function.
--
WYCIWYG - what you C is what you get

[ Post a follow-up to this message ]

On Jan 26, 10:44 am, "matevzb" <mate...@gmail.com> wrote:
> On Jan 26, 4:37 pm, af300...@gmail.com wrote:
> 
> 
> 
> 
> 
> Take a look at the $(error ...) function.
> --
> WYCIWYG - what you C is what you get

Thanks.

[ Post a follow-up to this message ]

On Jan 26, 1:37 pm, af300...@gmail.com wrote:
> Hi,
>
> I'm having some difficulty finding what I'm looking for on the GNU
> documentation site.  Basically, I want to have make exit if a
> particular condition is true.  Actually, because there are a few
> different compilers installed on the system, I need to make sure the
> correct one has been selected

Why not just select it directly then?

CC=/name/your/gcc
or
CXX=/name/your/g++

> and if not, to exit the script and warn
> the user.  Something like:
>
> ifeq (${GCC}, "/usr/bin/gcc")
>             echo "you must configure for compiler XXXXXX"
>             exit
> endif
>
> I can't find an exit command (at least not yet) and I was wondering if
> this is possible.  What would the command/directive be?
>
> (NOTE because of how the environment is, it's not trivial to configure
> for the right compiler.  Therefore, I want the users to configure
> before they call make.)
>
> Thanks,
> Andy

[ Post a follow-up to this message ]

On 26 Jan., 16:37, af300...@gmail.com wrote:
> Hi,
>
> I'm having some difficulty finding what I'm looking for on the GNU
> documentation site.  Basically, I want to have make exit if a
> particular condition is true.  Actually, because there are a few
> different compilers installed on the system, I need to make sure the
> correct one has been selected and if not, to exit the script and warn
> the user.  Something like:
>
> ifeq (${GCC}, "/usr/bin/gcc")
>             echo "you must configure for compiler XXXXXX"
>             exit
> endif
>
> I can't find an exit command (at least not yet) and I was wondering if
> this is possible.  What would the command/directive be?
>
> (NOTE because of how the environment is, it's not trivial to configure
> for the right compiler.  Therefore, I want the users to configure
> before they call make.)

Make exits on a false conditio. So an action like "false" will stop
make.
You can also use exit 1 (but not exit, which is exit 0, which is
true").

Knowing this you can create test actions:
- file exits:
test -f <filename>
..
(but check if you should put filename in a prerequisite

- file_does_not_exist:
[ !  -f <filename> ]
..

... exit if a particular conditions is true
condition ; [ $$? = 0 ]

If you want to output something on error, you can do

[ ! -f .lock ] || ( echo file .lock must not exist >&2 :
exit 1 ; }

Hubble

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