From: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
For some reason the gcc 8/3 build for powerpc behaves differently from
AMD64 and ARM64:
../providers/mlx4/qp.c: In function 'mlx4_post_send':
../providers/mlx4/qp.c:478:22: warning: 'ctrl' may be used uninitialized in this function [-Wmaybe-uninitialized]
ctrl->owner_opcode |= htobe32((qp->sq.head & 0xffff) << 8);
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
---
util/compiler.h | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/util/compiler.h b/util/compiler.h
index 16f5ee14be2a8a..dfce82f1884149 100644
--- a/util/compiler.h
+++ b/util/compiler.h
@@ -7,9 +7,10 @@
This is only enabled for old compilers. gcc 6.x and beyond have excellent
static flow analysis. If code solicits a warning from 6.x it is almost
- certainly too complex for a human to understand.
+ certainly too complex for a human to understand. For some reason powerpc
+ uses a different scheme than gcc for flow analysis.
*/
-#if __GNUC__ >= 6 || defined(__clang__)
+#if (__GNUC__ >= 6 && !defined(__powerpc__)) || defined(__clang__)
#define uninitialized_var(x) x
#else
#define uninitialized_var(x) x = x
--
2.22.0
