mbox series

[v4,0/3] Enable clang build on Windows

Message ID 20250110203401.178532-1-pierrick.bouvier@linaro.org
Headers show
Series Enable clang build on Windows | expand

Message

Pierrick Bouvier Jan. 10, 2025, 8:33 p.m. UTC
For now, it was only possible to build plugins using GCC on Windows. However,
windows-aarch64 only supports Clang.
This biggest roadblock was to get rid of gcc_struct attribute, which is not
supported by Clang. After investigation, we proved it was safe to drop it.

Built and tested on Windows (all msys env)/Linux/MacOS for x86_64 and aarch64
hosts.

v1 contained warning fixes and various bits that have been upstreamed already.
The only bits left in this series are the gcc_struct removal, and fixing the
plugins build with clang.

This series is for 10.0, as we decided to not include the gcc_struct removal is
9.2 release.

All patches are now reviewed, so this series can be pulled. I'll report that to
MSYS2 too, so we can enable clang environments for QEMU.

v1: https://patchew.org/QEMU/20241031040426.772604-1-pierrick.bouvier@linaro.org/

v2:
- drop attribute gcc_struct instead of using -mno-ms-bitfields option
- add a section about bitfields in documentation

v3:
- explain why gcc_struct attribute matters in packed structs in commit message
- reword the bitfields documentation with suggestions given

v4:
- edit for bitfields doc requested by Philippe

Pierrick Bouvier (3):
  win32: remove usage of attribute gcc_struct
  docs/devel/style: add a section about bitfield, and disallow them for
    packed structures
  plugins: enable linking with clang/lld

 docs/devel/style.rst                      | 20 +++++++++++++++++++
 meson.build                               |  6 +++---
 include/qemu/compiler.h                   |  7 +------
 scripts/cocci-macro-file.h                |  6 +-----
 subprojects/libvhost-user/libvhost-user.h |  6 +-----
 contrib/plugins/meson.build               |  2 +-
 plugins/meson.build                       | 24 +++++++++++++++++++----
 tests/tcg/plugins/meson.build             |  3 +--
 8 files changed, 48 insertions(+), 26 deletions(-)

Comments

Pierrick Bouvier Jan. 10, 2025, 8:37 p.m. UTC | #1
On 1/10/25 12:33, Pierrick Bouvier wrote:
> For now, it was only possible to build plugins using GCC on Windows. However,
> windows-aarch64 only supports Clang.
> This biggest roadblock was to get rid of gcc_struct attribute, which is not
> supported by Clang. After investigation, we proved it was safe to drop it.
> 
> Built and tested on Windows (all msys env)/Linux/MacOS for x86_64 and aarch64
> hosts.
> 
> v1 contained warning fixes and various bits that have been upstreamed already.
> The only bits left in this series are the gcc_struct removal, and fixing the
> plugins build with clang.
> 
> This series is for 10.0, as we decided to not include the gcc_struct removal is
> 9.2 release.
> 
> All patches are now reviewed, so this series can be pulled. I'll report that to
> MSYS2 too, so we can enable clang environments for QEMU.
> 
> v1: https://patchew.org/QEMU/20241031040426.772604-1-pierrick.bouvier@linaro.org/
> 
> v2:
> - drop attribute gcc_struct instead of using -mno-ms-bitfields option
> - add a section about bitfields in documentation
> 
> v3:
> - explain why gcc_struct attribute matters in packed structs in commit message
> - reword the bitfields documentation with suggestions given
> 
> v4:
> - edit for bitfields doc requested by Philippe
> 
> Pierrick Bouvier (3):
>    win32: remove usage of attribute gcc_struct
>    docs/devel/style: add a section about bitfield, and disallow them for
>      packed structures
>    plugins: enable linking with clang/lld
> 
>   docs/devel/style.rst                      | 20 +++++++++++++++++++
>   meson.build                               |  6 +++---
>   include/qemu/compiler.h                   |  7 +------
>   scripts/cocci-macro-file.h                |  6 +-----
>   subprojects/libvhost-user/libvhost-user.h |  6 +-----
>   contrib/plugins/meson.build               |  2 +-
>   plugins/meson.build                       | 24 +++++++++++++++++++----
>   tests/tcg/plugins/meson.build             |  3 +--
>   8 files changed, 48 insertions(+), 26 deletions(-)
> 

It would be nice if a maintainer could pull this, so we can get this 
merged upstream.

Thanks,
Pierrick