[dpdk-dev] [PATCH] doc: add known clang compilation issues

[dpdk-dev] [PATCH] doc: add known clang compilation issues

[Pablo de Lara]

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(+)

diff --git a/doc/guides/rel_notes/known_issues.rst b/doc/guides/rel_notes/known_issues.rst
index b782091..923a202 100644
--- a/doc/guides/rel_notes/known_issues.rst
+++ b/doc/guides/rel_notes/known_issues.rst
@@ -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).
-- 
2.5.0

Re: [dpdk-dev] [PATCH] doc: add known clang compilation issues

[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>

Re: [dpdk-dev] [PATCH] doc: add known clang compilation issues

[Thomas Monjalon]

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