Hello,
On Thu, Dec 08, 2005 at 10:24:26AM +0100, Daniel Kraft wrote:
> Prior to using the GNU build system (especially automake) I used my own plain
> Makefiles which set compiler flags like -g, -O2
> or -Ds enabling assertions depending on a variable set on commandline. So it
> was
> possible to compile debugging/optimized code just by changing the
> make-command:
>
> make mode=opt
> make mode=debug
> ...
with Automake, the situation is very similar; you are supposed to call
make CFLAGS=-O2
make CFLAGS=-g
...
> Using automake the default compiler flags seem to be -g -O2;
To be more exact: if you don't specify CFLAGS as an argument to the make,
a default value applies.
This default value is defined at configure time:
./configure CFLAGS=-O2 [...]
If you don't define the "default value for CFLAGS" as an argument to
./configure, then it deaults to "-g -O2".
To sum up:
1) give "CFLAGS=-O2" as an argument to ./configure
2) use CFLAGS=-g instead of make=debug
Yes, there are some difference:
With your old solution, the package maintainer prepared make=opt and such.
With the solution proposed above, _the user_ has to specify the values
when compiling the package. It looks more complicated, but it is more
standard: it should work with all packages which behave according GNU
Condig Standards.
Hope this helps,
Stepan Kasal
