Re: configure --extra-cflags and --extra-ldflags values not propagating to meson?

[Thomas Huth <thuth@redhat.com>]

On 22/10/2021 13.20, Owen LaGarde wrote:
> Am I using --extra-cflags and --extra-ldflags wrong in the configure call?
> 
> I'd like to source build several pre-reqs specific to supporting the qemu source
> build.  I'd specifically not like to install neither the qemu or re-req builds
> at the system level.  Normally I'd expect the --extra-cflags and --extra-ldflags
> configure options to do this but they do not appear to propagate to meson.  
> There
> was an approved meson patch back in 2018 for extra-cflags / extra-ldflags 
> and qemu
> is currently using meson >5.8(?) but it doesn't look like configure is 
> adding the
> args anywhere in the build tree.  There are a number of ways to do this, what's
> appropriate / future-proof wrt building qemu from source?  And why is configure
> supporting --extra-[c,ld]args but not doing anything with the values?

I see a similar behavior with netmap now - I've got the corresponding header 
file in a non-standard directory, and up to commit 837b84b1c078bf3e909 it 
used to work fine to do:

.../configure --enable-netmap \
     --extra-cflags=-I/path/to/netmap/sys

but since the conversion to meson, this does not seem to work anymore.

Paolo, any ideas?

  Thomas


PS: As a work-around, it seems to be fine to pass the flags via the CFLAGS 
environment variable instead:

CFLAGS=-I/path/to/netmap/sys .../configure --enable-netmap