[PATCH] libxl: CODING_STYLE: Explicitly deprecate #ifdef

[Ian Jackson <iwj@xxxxxxxxxxxxxx>]

We don't use ifdefs in the main code.  Actually document this.

Signed-off-by: Ian Jackson <iwj@xxxxxxxxxxxxxx>
---
 tools/libs/light/CODING_STYLE | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tools/libs/light/CODING_STYLE b/tools/libs/light/CODING_STYLE
index 3d572f6925..c2342c9d3b 100644
--- a/tools/libs/light/CODING_STYLE
+++ b/tools/libs/light/CODING_STYLE
@@ -121,6 +121,16 @@ permitted exceptions to the usual libxl code formatting 
rules.
 
 
 
+ARCHITECTURE-SPECIFIC CODE, CONDITIONAL COMPILATION
+---------------------------------------------------
+
+Architecture-specific code should be isolated in libxl_<arch>.c,
+with a function call interface, whereever possible.
+
+#ifdefs should be avoided, and in any case not interspersed through
+the primary functional code.
+
+
 IDEMPOTENT DATA STRUCTURE CONSTRUCTION/DESTRUCTION
 --------------------------------------------------
 
-- 
2.20.1