Re: [RFC PATCH] migration: Add missing dependency on GNUTLS

[Peter Maydell]

On Mon, 14 Jun 2021 at 06:28, Philippe Mathieu-Daudé <f4bug@amsat.org> wrote:
>
> Commit 7de2e856533 made migration/qemu-file-channel.c include
> "io/channel-tls.h" but forgot to add the new GNUTLS dependency
> on Meson, leading to build failure on OSX:
>
>   [2/35] Compiling C object libmigration.fa.p/migration_qemu-file-channel.c.o
>   FAILED: libmigration.fa.p/migration_qemu-file-channel.c.o
>   cc -Ilibmigration.fa.p -I. -I.. -Iqapi [ ... ] -o 
> libmigration.fa.p/migration_qemu-file-channel.c.o -c 
> ../migration/qemu-file-channel.c
>   In file included from ../migration/qemu-file-channel.c:29:
>   In file included from include/io/channel-tls.h:26:
>   In file included from include/crypto/tlssession.h:24:
>   include/crypto/tlscreds.h:28:10: fatal error: 'gnutls/gnutls.h' file not 
> found
>   #include <gnutls/gnutls.h>
>            ^~~~~~~~~~~~~~~~~
>   1 error generated.
>
> Reported-by: Stefan Weil <sw@weilnetz.de>
> Resolves: https://gitlab.com/qemu-project/qemu/-/issues/407
> Fixes: 7de2e856533 ("yank: Unregister function when using TLS migration")
> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

Is there really no way to get Meson to handle this kind
of thing properly (ie "just put all the include paths in the CFLAGS
for every compilation") rather than requiring us to add dependency
markers all over the meson.build files every time we add some
extra #include somewhere ? This is demonstrably horribly fragile
the way we have it at the moment :-(

-- PMM