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flatbuffers: Fix build with clang on big-endian machines

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Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
This commit is contained in:
Khem Raj
2017-09-19 21:14:27 -07:00
committed by Martin Jansa
parent bf406fbfbc
commit 281b007d48
3 changed files with 147 additions and 2 deletions
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meta-oe/recipes-devtools/flatbuffers/files/0001-flatbuffers-Move-EndianSwap-template-to-flatbuffers-.patch
+113
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@@ -0,0 +1,113 @@
From a614d8e20fa9e4fd16b699d581ddac2956c120f5 Mon Sep 17 00:00:00 2001
From: Khem Raj <raj.khem@gmail.com>
Date: Tue, 19 Sep 2017 10:04:02 -0700
Subject: [PATCH 1/2] flatbuffers: Move EndianSwap template to
flatbuffers/base.h
Clang complains
call to function 'EndianSwap' that is neither visible in the template definition nor found by argument-dependent lookup
return EndianSwap(t);
This seems to be due to limitation of two-phase lookup of dependent names in template definitions
Its not being found using associated namespaces therefore
it has to be made visible at the template definition site as well
Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
Upstream-Status: Submitted
include/flatbuffers/base.h | 33 +++++++++++++++++++++++++++++++++
include/flatbuffers/flatbuffers.h | 32 --------------------------------
2 files changed, 33 insertions(+), 32 deletions(-)
diff --git a/include/flatbuffers/base.h b/include/flatbuffers/base.h
index f051755..c73fb2d 100644
--- a/include/flatbuffers/base.h
+++ b/include/flatbuffers/base.h
@@ -150,6 +150,39 @@ typedef uintmax_t largest_scalar_t;
// We support aligning the contents of buffers up to this size.
#define FLATBUFFERS_MAX_ALIGNMENT 16
+template<typename T> T EndianSwap(T t) {
+ #if defined(_MSC_VER)
+ #define FLATBUFFERS_BYTESWAP16 _byteswap_ushort
+ #define FLATBUFFERS_BYTESWAP32 _byteswap_ulong
+ #define FLATBUFFERS_BYTESWAP64 _byteswap_uint64
+ #else
+ #if defined(__GNUC__) && __GNUC__ * 100 + __GNUC_MINOR__ < 408
+ // __builtin_bswap16 was missing prior to GCC 4.8.
+ #define FLATBUFFERS_BYTESWAP16(x) \
+ static_cast<uint16_t>(__builtin_bswap32(static_cast<uint32_t>(x) << 16))
+ #else
+ #define FLATBUFFERS_BYTESWAP16 __builtin_bswap16
+ #endif
+ #define FLATBUFFERS_BYTESWAP32 __builtin_bswap32
+ #define FLATBUFFERS_BYTESWAP64 __builtin_bswap64
+ #endif
+ if (sizeof(T) == 1) { // Compile-time if-then's.
+ return t;
+ } else if (sizeof(T) == 2) {
+ auto r = FLATBUFFERS_BYTESWAP16(*reinterpret_cast<uint16_t *>(&t));
+ return *reinterpret_cast<T *>(&r);
+ } else if (sizeof(T) == 4) {
+ auto r = FLATBUFFERS_BYTESWAP32(*reinterpret_cast<uint32_t *>(&t));
+ return *reinterpret_cast<T *>(&r);
+ } else if (sizeof(T) == 8) {
+ auto r = FLATBUFFERS_BYTESWAP64(*reinterpret_cast<uint64_t *>(&t));
+ return *reinterpret_cast<T *>(&r);
+ } else {
+ assert(0);
+ }
+}
+
+
template<typename T> T EndianScalar(T t) {
#if FLATBUFFERS_LITTLEENDIAN
return t;
diff --git a/include/flatbuffers/flatbuffers.h b/include/flatbuffers/flatbuffers.h
index 9216cf4..f749dcb 100644
--- a/include/flatbuffers/flatbuffers.h
+++ b/include/flatbuffers/flatbuffers.h
@@ -37,38 +37,6 @@ inline void EndianCheck() {
(void)endiantest;
}
-template<typename T> T EndianSwap(T t) {
- #if defined(_MSC_VER)
- #define FLATBUFFERS_BYTESWAP16 _byteswap_ushort
- #define FLATBUFFERS_BYTESWAP32 _byteswap_ulong
- #define FLATBUFFERS_BYTESWAP64 _byteswap_uint64
- #else
- #if defined(__GNUC__) && __GNUC__ * 100 + __GNUC_MINOR__ < 408
- // __builtin_bswap16 was missing prior to GCC 4.8.
- #define FLATBUFFERS_BYTESWAP16(x) \
- static_cast<uint16_t>(__builtin_bswap32(static_cast<uint32_t>(x) << 16))
- #else
- #define FLATBUFFERS_BYTESWAP16 __builtin_bswap16
- #endif
- #define FLATBUFFERS_BYTESWAP32 __builtin_bswap32
- #define FLATBUFFERS_BYTESWAP64 __builtin_bswap64
- #endif
- if (sizeof(T) == 1) { // Compile-time if-then's.
- return t;
- } else if (sizeof(T) == 2) {
- auto r = FLATBUFFERS_BYTESWAP16(*reinterpret_cast<uint16_t *>(&t));
- return *reinterpret_cast<T *>(&r);
- } else if (sizeof(T) == 4) {
- auto r = FLATBUFFERS_BYTESWAP32(*reinterpret_cast<uint32_t *>(&t));
- return *reinterpret_cast<T *>(&r);
- } else if (sizeof(T) == 8) {
- auto r = FLATBUFFERS_BYTESWAP64(*reinterpret_cast<uint64_t *>(&t));
- return *reinterpret_cast<T *>(&r);
- } else {
- assert(0);
- }
-}
-
template<typename T> FLATBUFFERS_CONSTEXPR size_t AlignOf() {
#ifdef _MSC_VER
return __alignof(T);
--
2.14.1
meta-oe/recipes-devtools/flatbuffers/files/0002-use-__builtin_bswap16-when-building-with-clang.patch
+30
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@@ -0,0 +1,30 @@
From 626fe5e043de25e970ebdf061b88c646fa689113 Mon Sep 17 00:00:00 2001
From: Khem Raj <raj.khem@gmail.com>
Date: Tue, 19 Sep 2017 10:09:31 -0700
Subject: [PATCH 2/2] use __builtin_bswap16 when building with clang
clang pretends to be gcc 4.2.0 and therefore the code does
not use __builtin_bswap16 but tries to synthesize it
Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
Upstream-Status: Submitted
include/flatbuffers/base.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/flatbuffers/base.h b/include/flatbuffers/base.h
index c73fb2d..13e8fac 100644
--- a/include/flatbuffers/base.h
+++ b/include/flatbuffers/base.h
@@ -156,7 +156,7 @@ template<typename T> T EndianSwap(T t) {
#define FLATBUFFERS_BYTESWAP32 _byteswap_ulong
#define FLATBUFFERS_BYTESWAP64 _byteswap_uint64
#else
- #if defined(__GNUC__) && __GNUC__ * 100 + __GNUC_MINOR__ < 408
+ #if defined(__GNUC__) && __GNUC__ * 100 + __GNUC_MINOR__ < 408 && !defined(__clang__)
// __builtin_bswap16 was missing prior to GCC 4.8.
#define FLATBUFFERS_BYTESWAP16(x) \
static_cast<uint16_t>(__builtin_bswap32(static_cast<uint32_t>(x) << 16))
--
2.14.1
meta-oe/recipes-devtools/flatbuffers/flatbuffers_1.7.1.bb
+4 -2
View File
@@ -13,8 +13,10 @@ LIC_FILES_CHKSUM = "file://LICENSE.txt;md5=a873c5645c184d51e0f9b34e1d7cf559"
SRCREV = "25a15950f5a24d7217689739ed8f6dac64912d62" SRCREV = "25a15950f5a24d7217689739ed8f6dac64912d62"
SRC_URI = "git://github.com/google/flatbuffers.git \ SRC_URI = "git://github.com/google/flatbuffers.git \
file://0001-correct-version-for-so-lib.patch \ file://0001-correct-version-for-so-lib.patch \
" file://0001-flatbuffers-Move-EndianSwap-template-to-flatbuffers-.patch \
file://0002-use-__builtin_bswap16-when-building-with-clang.patch \
"
# Make sure C++11 is used, required for example for GCC 4.9 # Make sure C++11 is used, required for example for GCC 4.9
CXXFLAGS += "-std=c++11" CXXFLAGS += "-std=c++11"