[dpdk-dev] doc: add known clang compilation issues
Commit Message
Add known issue about DPDK not compiling on some CPUs
with clang versions older than 3.7.0.
Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
---
doc/guides/rel_notes/known_issues.rst | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
Comments
> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Pablo de Lara
> Sent: Thursday, February 18, 2016 3:21 PM
> To: dev@dpdk.org
> Subject: [dpdk-dev] [PATCH] doc: add known clang compilation issues
>
> Add known issue about DPDK not compiling on some CPUs with clang versions
> older than 3.7.0.
>
> Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
Acked-by: John McNamara <john.mcnamara@intel.com>
2016-02-18 15:23, Mcnamara, John:
> > -----Original Message-----
> > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Pablo de Lara
> > Sent: Thursday, February 18, 2016 3:21 PM
> > To: dev@dpdk.org
> > Subject: [dpdk-dev] [PATCH] doc: add known clang compilation issues
> >
> > Add known issue about DPDK not compiling on some CPUs with clang versions
> > older than 3.7.0.
> >
> > Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
>
> Acked-by: John McNamara <john.mcnamara@intel.com>
Applied, thanks
@@ -598,3 +598,23 @@ VM power manager may not work on systems with more than 64 cores
**Driver/Module**:
VM power manager application.
+
+
+DPDK may not build on some Intel CPUs using clang < 3.7.0
+---------------------------------------------------------
+
+**Description**:
+ When compiling DPDK with an earlier version than 3.7.0 of clang, CPU flags are not detected on some Intel platforms
+ such as Intel Broadwell/Skylake (and possibly future CPUs), and therefore compilation fails due to missing intrinsics.
+
+**Implication**:
+ DPDK will not build when using a clang version < 3.7.0.
+
+**Resolution/Workaround**:
+ Use clang 3.7.0 or higher, or gcc.
+
+**Affected Environment/Platform**:
+ Platforms with Intel Broadwell/Skylake using an old clang version.
+
+**Driver/Module**:
+ Environment Abstraction Layer (EAL).