On 03/03/2010 03:27 PM, Steffen Dettmer wrote:
On Wed, Mar 3, 2010 at 2:44 PM, Eric Blake<eblake@xxxxxxxxxx> wrote:
According to Steffen Dettmer on 3/3/2010 6:33 AM:
Do I understand correctly that it is generally adviced to not use
the option -Werror?
Not quite. The advice is to not mix -Werror and configure.
ahh ok, this is fine!
There is no need to have -Werror during configure.
So it seems again we just do the things wrongly :)
But how to do it correctly?
Post-configure, you can use -Werror to your heart's content, and I do it
all the time in packages that I maintain.
I'm not sure if I get this...
How do I use -Werror or -WX post-configure correctly?
Several ways:
a) Override CFLAGS at make time:
./configure CFLAGS="<cflags>"
make CFLAGS="<cflags -Werror"
This is what I would do - It doesn't clutter the autotool-files with
GCC-proprietary -Werror handling and is appropriate for development
purposes.
b) Implement it as a conditional AC_SUBST, i.e.
something similar to
AC_ARG_ENABLE([werror],
...
/* if gcc */
CFLAGS_WERROR="-Werror"
...
/* if other compiler */
CFLAGS_WERROR="<whatever>"
...
])
AC_SUBST([CFLAGS_WERROR])
accompanied by something similar to this in your Makefile.in's
CFLAGS = @CFLAGS@ @CFLAGS_WERROR@
rsp. (in case of using automake)
AM_CFLAGS = @CFLAGS_WERROR@
I would not want to use this approach.
Ralf
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