configure: Use the -Wno-packed-not-aligned compiler option if available
Gerald Pfeifer
gerald at pfeifer.com
Sat Nov 4 14:06:07 CDT 2017
GCC 8 is going to add a warning option -Wpacked-not-aligned, active
by default, which is documented as follows:
Warn if a structure field with explicitly specified alignment in a
packed struct or union is misaligned. For example, a warning will
be issued on struct S, like, "warning: alignment 1 of
'struct S' is less than 8", in this code:
struct __attribute__ ((aligned (8))) S8 { char a[8]; };
struct __attribute__ ((packed)) S {
struct S8 s8;
};
This is causing half a megabyte of warning messages in my nightly
builds such as
388 ../../include/d3d9types.h:1579:19: warning: 'SyncGPUTime' offset 20 in 'struct _D3DPRESENTSTATS' isn't aligned to 8 [-Wpacked-not-aligned]
776 ../../include/d3d9types.h:1580:1: warning: alignment 4 of 'struct _D3DPRESENTSTATS' is less than 8 [-Wpacked-not-aligned]
1112 ../../include/winnt.h:4578:1: warning: alignment 4 of 'struct _TOKEN_STATISTICS' is less than 8 [-Wpacked-not-aligned]
I assume we do want to disable all these warnings, which my patch
below does.
Gerald
Signed-off-by: Gerald Pfeifer <gerald at pfeifer.com>
---
configure.ac | 1 +
1 file changed, 1 insertion(+)
diff --git a/configure.ac b/configure.ac
index 29f4cd1ffa..637979a83a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1824,6 +1824,7 @@ then
WINE_TRY_CFLAGS([-Wdeclaration-after-statement])
WINE_TRY_CFLAGS([-Wempty-body])
WINE_TRY_CFLAGS([-Wignored-qualifiers])
+ WINE_TRY_CFLAGS([-Wno-packed-not-aligned])
WINE_TRY_CFLAGS([-Wshift-overflow=2])
WINE_TRY_CFLAGS([-Wstrict-prototypes])
WINE_TRY_CFLAGS([-Wtype-limits])
--
2.14.1
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