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https://cmake.org/gitweb?p=cmake.git;a=commitdiff;h=9a24d6a269df453ce684bfe856b7a3570f5b141f
commit 9a24d6a269df453ce684bfe856b7a3570f5b141f
Merge: 786a5bb 96a1513
Author: Brad King <brad.k...@kitware.com>
AuthorDate: Fri Oct 23 10:39:10 2015 -0400
Commit: CMake Topic Stage <kwro...@kitware.com>
CommitDate: Fri Oct 23 10:39:10 2015 -0400
Merge topic 'update-libarchive' into next
96a15139 libarchive: Test for Clang builtin before using it
https://cmake.org/gitweb?p=cmake.git;a=commitdiff;h=96a151398387fae00dde98c2a626f38b635e114c
commit 96a151398387fae00dde98c2a626f38b635e114c
Author: Brad King <brad.k...@kitware.com>
AuthorDate: Fri Oct 23 10:24:47 2015 -0400
Commit: Brad King <brad.k...@kitware.com>
CommitDate: Fri Oct 23 10:24:47 2015 -0400
libarchive: Test for Clang builtin before using it
The __builtin_bswap16 builtin is not available on Clang 2.1.
diff --git
a/Utilities/cmlibarchive/libarchive/archive_read_support_format_lha.c
b/Utilities/cmlibarchive/libarchive/archive_read_support_format_lha.c
index c359d83..eff02d8 100644
--- a/Utilities/cmlibarchive/libarchive/archive_read_support_format_lha.c
+++ b/Utilities/cmlibarchive/libarchive/archive_read_support_format_lha.c
@@ -1712,10 +1712,13 @@ lha_crc16(uint16_t crc, const void *pp, size_t len)
for (;len >= 8; len -= 8) {
/* This if statement expects compiler optimization will
* remove the stament which will not be executed. */
+#ifndef __has_builtin
+# define __has_builtin(x) 0
+#endif
#if defined(_MSC_VER) && _MSC_VER >= 1400 /* Visual Studio */
# define bswap16(x) _byteswap_ushort(x)
#elif (defined(__GNUC__) && __GNUC__ >= 4 && __GNUC_MINOR__ >= 8) \
- || defined(__clang__)
+ || (defined(__clang__) && __has_builtin(__builtin_bswap16))
# define bswap16(x) __builtin_bswap16(x)
#else
# define bswap16(x) ((((x) >> 8) & 0xff) | ((x) << 8))
-----------------------------------------------------------------------
Summary of changes:
.../cmlibarchive/libarchive/archive_read_support_format_lha.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
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