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Re: [Qemu-devel] [PATCH 4/7] libvhost-user: convert to Meson
From: |
Markus Armbruster |
Subject: |
Re: [Qemu-devel] [PATCH 4/7] libvhost-user: convert to Meson |
Date: |
Thu, 27 Jun 2019 11:03:30 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/26.2 (gnu/linux) |
Paolo Bonzini <address@hidden> writes:
> Because libqemuutil.a is not converted yet, selected files have to be
> compiled twice, once with Meson and once with Makefile.objs. Apart
> from this the conversion is straightforward.
>
> Signed-off-by: Paolo Bonzini <address@hidden>
> ---
> Makefile | 10 ++++------
> Makefile.objs | 1 -
> contrib/libvhost-user/Makefile.objs | 1 -
> contrib/libvhost-user/meson.build | 7 +++++++
> meson.build | 2 ++
> 5 files changed, 13 insertions(+), 8 deletions(-)
> delete mode 100644 contrib/libvhost-user/Makefile.objs
> create mode 100644 contrib/libvhost-user/meson.build
>
> diff --git a/Makefile b/Makefile
> index b8f802c..6a3461e 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -426,7 +426,6 @@ dummy := $(call unnest-vars,, \
> ivshmem-client-obj-y \
> ivshmem-server-obj-y \
> rdmacm-mux-obj-y \
> - libvhost-user-obj-y \
> vhost-user-scsi-obj-y \
> vhost-user-blk-obj-y \
> vhost-user-input-obj-y \
> @@ -529,7 +528,6 @@ Makefile: $(version-obj-y)
> # Build libraries
>
> libqemuutil.a: $(util-obj-y) $(trace-obj-y) $(stub-obj-y)
> -libvhost-user.a: $(libvhost-user-obj-y) $(util-obj-y) $(stub-obj-y)
>
> ######################################################################
>
> @@ -632,21 +630,21 @@ ivshmem-client$(EXESUF): $(ivshmem-client-obj-y)
> $(COMMON_LDADDS)
> ivshmem-server$(EXESUF): $(ivshmem-server-obj-y) $(COMMON_LDADDS)
> $(call LINK, $^)
> endif
> -vhost-user-scsi$(EXESUF): $(vhost-user-scsi-obj-y) libvhost-user.a
> +vhost-user-scsi$(EXESUF): $(vhost-user-scsi-obj-y)
> contrib/libvhost-user/libvhost-user.a
> $(call LINK, $^)
> -vhost-user-blk$(EXESUF): $(vhost-user-blk-obj-y) libvhost-user.a
> +vhost-user-blk$(EXESUF): $(vhost-user-blk-obj-y)
> contrib/libvhost-user/libvhost-user.a
> $(call LINK, $^)
>
> rdmacm-mux$(EXESUF): LIBS += "-libumad"
> rdmacm-mux$(EXESUF): $(rdmacm-mux-obj-y) $(COMMON_LDADDS)
> $(call LINK, $^)
>
> -vhost-user-gpu$(EXESUF): $(vhost-user-gpu-obj-y) $(libvhost-user-obj-y)
> libqemuutil.a libqemustub.a
> +vhost-user-gpu$(EXESUF): $(vhost-user-gpu-obj-y)
> contrib/libvhost-user/libvhost-user.a
> $(call LINK, $^)
>
> ifdef CONFIG_VHOST_USER_INPUT
> ifdef CONFIG_LINUX
> -vhost-user-input$(EXESUF): $(vhost-user-input-obj-y) libvhost-user.a
> libqemuutil.a
> +vhost-user-input$(EXESUF): $(vhost-user-input-obj-y)
> contrib/libvhost-user/libvhost-user.a $(COMMON_LDADDS)
> $(call LINK, $^)
>
> # build by default, do not install
This hunk is only due to the move of libvhost-user.a from the root of
the build tree to contrib/libvhost-user/. I'm not counting it as "meson
churn".
> diff --git a/Makefile.objs b/Makefile.objs
> index c8337fa..4f2fa6a 100644
> --- a/Makefile.objs
> +++ b/Makefile.objs
> @@ -116,7 +116,6 @@ qga-vss-dll-obj-y = qga/
> elf2dmp-obj-y = contrib/elf2dmp/
> ivshmem-client-obj-$(CONFIG_IVSHMEM) = contrib/ivshmem-client/
> ivshmem-server-obj-$(CONFIG_IVSHMEM) = contrib/ivshmem-server/
> -libvhost-user-obj-y = contrib/libvhost-user/
> vhost-user-scsi.o-cflags := $(LIBISCSI_CFLAGS)
> vhost-user-scsi.o-libs := $(LIBISCSI_LIBS)
> vhost-user-scsi-obj-y = contrib/vhost-user-scsi/
> diff --git a/contrib/libvhost-user/Makefile.objs
> b/contrib/libvhost-user/Makefile.objs
> deleted file mode 100644
> index ef3778e..0000000
> --- a/contrib/libvhost-user/Makefile.objs
> +++ /dev/null
> @@ -1 +0,0 @@
> -libvhost-user-obj-y += libvhost-user.o libvhost-user-glib.o
> diff --git a/contrib/libvhost-user/meson.build
> b/contrib/libvhost-user/meson.build
> new file mode 100644
> index 0000000..7ef610a
> --- /dev/null
> +++ b/contrib/libvhost-user/meson.build
> @@ -0,0 +1,7 @@
> +libvhost_user = static_library('vhost-user',
> + [files('libvhost-user.c', 'libvhost-user-glib.c'),
These are the "selected files [that] have to be compiled twice, once
with Meson and once with Makefile.objs":
> + meson.source_root() / 'stubs/error-printf.c',
> + meson.source_root() / 'stubs/monitor.c',
> + meson.source_root() / 'util/error.c',
> + meson.source_root() / 'util/qemu-error.c',
> + meson.source_root() / 'util/memfd.c'])
Quite okay for a PoC.
> diff --git a/meson.build b/meson.build
> index b683d70..a6748f9 100644
> --- a/meson.build
> +++ b/meson.build
> @@ -7,3 +7,5 @@ add_project_arguments(config_host['QEMU_CFLAGS'].split(),
> language: 'c')
> add_project_arguments(config_host['QEMU_INCLUDES'].split(),
> language: 'c')
> +
> +subdir('contrib/libvhost-user')
In your cover letter, you wrote "it's a simple example of how the
current build system causes clutter in the toplevel Makefiles and how
interrelated the Makefile, Makefile.objs and contrib/*/Makefile.objs
file are even for such simple executables." True. Before this patch,
the logic for building libvhost-user.a is split over Makefile (two
lines), Makefile.obj (one) and contrib/libvhost-user/Makefile.objs
(one). Afterwards, its all in one place.
- [Qemu-devel] [RFC PATCH 0/7] Proof of concept for Meson integration, Paolo Bonzini, 2019/06/10
- [Qemu-devel] [PATCH 1/7] configure: do not include $(...) variables in config-host.mak, Paolo Bonzini, 2019/06/10
- [Qemu-devel] [PATCH 2/7] configure: set $PYTHON to a full path, Paolo Bonzini, 2019/06/10
- [Qemu-devel] [PATCH 4/7] libvhost-user: convert to Meson, Paolo Bonzini, 2019/06/10
- Re: [Qemu-devel] [PATCH 4/7] libvhost-user: convert to Meson,
Markus Armbruster <=
- [Qemu-devel] [PATCH 5/7] vhost-user-blk: convert to Meson, Paolo Bonzini, 2019/06/10
- [Qemu-devel] [PATCH 6/7] vhost-user-scsi: convert to Meson, Paolo Bonzini, 2019/06/10
- [Qemu-devel] [PATCH 7/7] rdmacm-mux: convert to Meson, Paolo Bonzini, 2019/06/10
- [Qemu-devel] [PATCH 3/7] configure: integrate Meson in the build system, Paolo Bonzini, 2019/06/10