Clang's gnu99 mode is not quite the same as GCC's. It will complain
about redefined typedefs being a C11 feature, while GCC does not
complain and allows them in GNU99.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---

Technically a build breaker fix, but given my track record of
breaking the build today/yestday, lets have a reviewer approve :-)

 m4/virt-compile-warnings.m4 | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/m4/virt-compile-warnings.m4 b/m4/virt-compile-warnings.m4
index 26f231f97e..4f9eee121c 100644
--- a/m4/virt-compile-warnings.m4
+++ b/m4/virt-compile-warnings.m4
@@ -125,6 +125,10 @@ AC_DEFUN([LIBVIRT_COMPILE_WARNINGS],[
     # We do "bad" function casts all the time for event callbacks
     wantwarn="$wantwarn -Wno-cast-function-type"
 
+    # CLang incorrectly complains about dup typedefs win gnu99 mode
+    # so use this CLang-specific arg to keep it quiet
+    wantwarn="$wantwarn -Wno-typedef-redefinition"
+
     # GNULIB expects this to be part of -Wc++-compat, but we turn
     # that one off, so we need to manually enable this again
     wantwarn="$wantwarn -Wjump-misses-init"
-- 
2.21.0

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On Tue, Oct 8, 2019 at 5:14 PM Daniel P. Berrangé <berrange@redhat.com> wrote:
>
> Clang's gnu99 mode is not quite the same as GCC's. It will complain
> about redefined typedefs being a C11 feature, while GCC does not
> complain and allows them in GNU99.
>
> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
> ---
>
> Technically a build breaker fix, but given my track record of
> breaking the build today/yestday, lets have a reviewer approve :-)
>
>  m4/virt-compile-warnings.m4 | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/m4/virt-compile-warnings.m4 b/m4/virt-compile-warnings.m4
> index 26f231f97e..4f9eee121c 100644
> --- a/m4/virt-compile-warnings.m4
> +++ b/m4/virt-compile-warnings.m4
> @@ -125,6 +125,10 @@ AC_DEFUN([LIBVIRT_COMPILE_WARNINGS],[
>      # We do "bad" function casts all the time for event callbacks
>      wantwarn="$wantwarn -Wno-cast-function-type"
>
> +    # CLang incorrectly complains about dup typedefs win gnu99 mode
> +    # so use this CLang-specific arg to keep it quiet
> +    wantwarn="$wantwarn -Wno-typedef-redefinition"
> +

Is this the *only* failure we have with CLang? If so ...
Reviewed-by: Fabiano Fidêncio <fidencio@redhat.com>

Best Regards,
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Fabiano Fidêncio

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On Tue, Oct 08, 2019 at 15:39:22 +0100, Daniel Berrange wrote:
> Clang's gnu99 mode is not quite the same as GCC's. It will complain
> about redefined typedefs being a C11 feature, while GCC does not
> complain and allows them in GNU99.
> 
> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
> ---
> 
> Technically a build breaker fix, but given my track record of
> breaking the build today/yestday, lets have a reviewer approve :-)
> 
>  m4/virt-compile-warnings.m4 | 4 ++++
>  1 file changed, 4 insertions(+)

ACK,

tested with:

clang version 8.0.0 (Fedora 8.0.0-1.fc30)
gcc version 9.2.1 20190827 (Red Hat 9.2.1-1) (GCC)

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