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Re: [PATCH 2/3] configure: Fix building with SASL on Windows
From: |
Daniel P . Berrangé |
Subject: |
Re: [PATCH 2/3] configure: Fix building with SASL on Windows |
Date: |
Mon, 9 Mar 2020 09:57:46 +0000 |
User-agent: |
Mutt/1.13.3 (2020-01-12) |
On Sat, Mar 07, 2020 at 06:22:21PM +0100, Philippe Mathieu-Daudé wrote:
> The Simple Authentication and Security Layer (SASL) library
> re-defines the struct iovec on Win32 [*]. QEMU also re-defines
> it in "qemu/osdep.h". The two definitions then clash on a MinGW
> build.
> We can avoid the SASL definition by defining STRUCT_IOVEC_DEFINED.
> Add the definition to vnc_sasl_cflags if we are uing MinGW.
>
> [*]
> https://github.com/cyrusimap/cyrus-sasl/blob/cyrus-sasl-2.1.27/include/sasl.h#L187
>
> Cc: Alexey Pavlov <address@hidden>
> Cc: Biswapriyo Nath <address@hidden>
> Cc: Youry Metlitsky <address@hidden>
> Signed-off-by: Philippe Mathieu-Daudé <address@hidden>
> ---
> configure | 8 +++++++-
> 1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/configure b/configure
> index 0c2dd1eb08..0bc87ce42a 100755
> --- a/configure
> +++ b/configure
> @@ -3375,7 +3375,13 @@ if test "$vnc" = "yes" && test "$vnc_sasl" != "no" ;
> then
> int main(void) { sasl_server_init(NULL, "qemu"); return 0; }
> EOF
> # Assuming Cyrus-SASL installed in /usr prefix
> - vnc_sasl_cflags=""
> + if test "$mingw32" = "yes" && test "$iovec" != "yes"; then
I don't get why we need the "iovec != yes" check there ?
On mingw sys/uio.h doesn't exist, so "$iovec" will always
be "no", and so this conditional is equivalent to
if test "$mingw32" = "yes; then
If for some strange reason, a future Windows adds sys/uio.h
header containing struct iovec, then QEMU won't define its
own local copy if struct iovec, and so "$iovec" will be "yes".
In this situation we don't want SASL to define its struct iovec
either.
IOW we need -DSTRUCT_IOVEC_DEFINED no matter what $iovec value
is AFAICT.
This would mean the previous patch is redundant too.
> + # QEMU defines struct iovec in "qemu/osdep.h",
> + # we don't want libsasl to redefine it in <sasl/sasl.h>.
> + vnc_sasl_cflags="-DSTRUCT_IOVEC_DEFINED"
> + else
> + vnc_sasl_cflags=""
> + fi
> vnc_sasl_libs="-lsasl2"
> if compile_prog "$vnc_sasl_cflags" "$vnc_sasl_libs" ; then
> vnc_sasl=yes
Regards,
Daniel
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