diff options
Diffstat (limited to 'meta/recipes-devtools/ruby/ruby/0001-fiddle-Use-C11-_Alignof-to-define-ALIGN_OF-when-poss.patch')
| -rw-r--r-- | meta/recipes-devtools/ruby/ruby/0001-fiddle-Use-C11-_Alignof-to-define-ALIGN_OF-when-poss.patch | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/meta/recipes-devtools/ruby/ruby/0001-fiddle-Use-C11-_Alignof-to-define-ALIGN_OF-when-poss.patch b/meta/recipes-devtools/ruby/ruby/0001-fiddle-Use-C11-_Alignof-to-define-ALIGN_OF-when-poss.patch new file mode 100644 index 0000000000..1dff9c0f8c --- /dev/null +++ b/meta/recipes-devtools/ruby/ruby/0001-fiddle-Use-C11-_Alignof-to-define-ALIGN_OF-when-poss.patch @@ -0,0 +1,52 @@ +From 6b3c202b46b9312c5bb0789145f13d8086e70948 Mon Sep 17 00:00:00 2001 +From: Khem Raj <raj.khem@gmail.com> +Date: Sun, 15 Jan 2023 02:34:17 -0800 +Subject: [PATCH] fiddle: Use C11 _Alignof to define ALIGN_OF when possible + +WG14 N2350 made very clear that it is an UB having type definitions +within "offsetof" [1]. This patch enhances the implementation of macro +ALIGN_OF to use builtin "_Alignof" to avoid undefined behavior +when using std=c11 or newer + +clang 16+ has started to flag this [2] + +Fixes build when using -std >= gnu11 and using clang16+ + +Older compilers gcc < 4.9 or clang < 8 has buggy _Alignof even though it +may support C11, exclude those compiler versions + +[1] https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2350.htm +[2] https://reviews.llvm.org/D133574 + +Upstream-Status: Submitted [https://github.com/ruby/fiddle/pull/120] +Signed-off-by: Khem Raj <raj.khem@gmail.com> +--- + ext/fiddle/fiddle.h | 12 +++++++++++- + 1 file changed, 11 insertions(+), 1 deletion(-) + +diff --git a/ext/fiddle/fiddle.h b/ext/fiddle/fiddle.h +index 10eb9ce..ffb395e 100644 +--- a/ext/fiddle/fiddle.h ++++ b/ext/fiddle/fiddle.h +@@ -196,7 +196,17 @@ + #endif + #define TYPE_UINTPTR_T (-TYPE_INTPTR_T) + +-#define ALIGN_OF(type) offsetof(struct {char align_c; type align_x;}, align_x) ++/* GCC releases before GCC 4.9 had a bug in _Alignof. See GCC bug 52023 ++ <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52023>. ++ clang versions < 8.0.0 have the same bug. */ ++#if (!defined __STDC_VERSION__ || __STDC_VERSION__ < 201112 \ ++ || (defined __GNUC__ && __GNUC__ < 4 + (__GNUC_MINOR__ < 9) \ ++ && !defined __clang__) \ ++ || (defined __clang__ && __clang_major__ < 8)) ++# define ALIGN_OF(type) offsetof(struct {char align_c; type align_x;}, align_x) ++#else ++# define ALIGN_OF(type) _Alignof(type) ++#endif + + #define ALIGN_VOIDP ALIGN_OF(void*) + #define ALIGN_CHAR ALIGN_OF(char) +-- +2.39.0 + |