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Re: [Qemu-devel] [PATCH] configure: mark qemu-ga VSS includes as system
From: |
Michael Roth |
Subject: |
Re: [Qemu-devel] [PATCH] configure: mark qemu-ga VSS includes as system headers |
Date: |
Thu, 30 Jun 2016 14:06:32 -0500 |
User-agent: |
alot/0.3.6 |
Quoting Michael Roth (2016-06-28 18:43:46)
> As of e4650c81, we do w32 builds with -Werror enabled. Unfortunately
> for cases where we enable VSS support in qemu-ga, we still have
> warnings generated by VSS includes that ship as part of the Microsoft
> VSS SDK.
>
> We can selectively address a number of these warnings using
>
> #pragma GCC diagnostic ignored ...
>
> but at least one of these:
>
> warning: ‘typedef’ was ignored in this declaration
>
> resulting from declarations of the form:
>
> typedef struct Blah { ... };
>
> does not provide a specific command-line/pragma option to disable
> warnings of the sort.
>
> To allow VSS builds to succeed, the next-best option is disabling
> these warnings on a per-file basis. pragmas like #pragma GCC
> system_header can be used to declare subsequent includes/declarations
> as being exempt from normal warnings, but this must be done within
> a header file.
>
> Since we don't control the VSS SDK, we'd need to rely on a
> intermediate header include to accomplish this, and
> since different objects in the VSS link target rely on different
> headers from the VSS SDK, this would become somewhat of a rat's nest
> (though not totally unmanageable).
>
> The next step up in granularity is just marking the entire VSS
> SDK include path as system headers via -isystem. This is a bit more
> heavy-handed, but since this SDK hasn't changed since 2005, there's
> likely little to be gained from selectively disabling warnings
> anyway, so we implement that approach here.
>
> This fixes the -Werror failures in both the configure test and the
> qga build due to shared reliance on $vss_win32_include. For the
> same reason, this also enforces a new dependency on -isystem support
> in the C/C++ compiler when building QGA with VSS enabled.
>
> Cc: Thomas Huth <address@hidden>
> Cc: Stefan Weil <address@hidden>
> Cc: Paolo Bonzini <address@hidden>
> Signed-off-by: Michael Roth <address@hidden>
Thanks, applied to qga tree:
https://github.com/mdroth/qemu/commits/qga
> ---
> configure | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/configure b/configure
> index e14e907..2d84bc5 100755
> --- a/configure
> +++ b/configure
> @@ -4049,13 +4049,13 @@ fi
>
> if test "$mingw32" = "yes" -a "$guest_agent" != "no" -a "$vss_win32_sdk" !=
> "no" ; then
> case "$vss_win32_sdk" in
> - "") vss_win32_include="-I$source_path" ;;
> + "") vss_win32_include="-isystem $source_path" ;;
> *\ *) # The SDK is installed in "Program Files" by default, but we cannot
> # handle path with spaces. So we symlink the headers into
> ".sdk/vss".
> - vss_win32_include="-I$source_path/.sdk/vss"
> + vss_win32_include="-isystem $source_path/.sdk/vss"
> symlink "$vss_win32_sdk/inc" "$source_path/.sdk/vss/inc"
> ;;
> - *) vss_win32_include="-I$vss_win32_sdk"
> + *) vss_win32_include="-isystem $vss_win32_sdk"
> esac
> cat > $TMPC << EOF
> #define __MIDL_user_allocate_free_DEFINED__
> --
> 1.9.1
>
>