[Xen-changelog] [xen master] libxl: fix build with glibc < 2.9

[patchbot@xxxxxxx]

commit 23d72aaa0ccb206b0447b1efa9f1012f093162ee
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Wed Jul 22 14:15:12 2015 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Jul 22 14:15:12 2015 +0200

    libxl: fix build with glibc < 2.9
    
    htobe*() and be*toh() don't exist there. While replacing the 32-bit
    ones with hton() and ntoh() would be possible, there wouldn't be an
    obvious replacement for the 64-bit ones. Hence just take what current
    glibc (2.21) has (assuming __bswap_*() exists, which it does back to
    at least 2.4 according to my checking).
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 tools/libxl/libxl_osdeps.h |   36 ++++++++++++++++++++++++++++++++++++
 1 files changed, 36 insertions(+), 0 deletions(-)

diff --git a/tools/libxl/libxl_osdeps.h b/tools/libxl/libxl_osdeps.h
index b265df8..d9661c9 100644
--- a/tools/libxl/libxl_osdeps.h
+++ b/tools/libxl/libxl_osdeps.h
@@ -59,6 +59,42 @@ int asprintf(char **buffer, char *fmt, ...);
 int vasprintf(char **buffer, const char *fmt, va_list ap);
 #endif /*NEED_OWN_ASPRINTF*/
 
+#ifndef htobe32 /* glibc < 2.9 */
+# include <byteswap.h>
+
+# if __BYTE_ORDER == __LITTLE_ENDIAN
+#  define htobe16(x) __bswap_16(x)
+#  define htole16(x) (x)
+#  define be16toh(x) __bswap_16(x)
+#  define le16toh(x) (x)
+
+#  define htobe32(x) __bswap_32(x)
+#  define htole32(x) (x)
+#  define be32toh(x) __bswap_32(x)
+#  define le32toh(x) (x)
+
+#  define htobe64(x) __bswap_64(x)
+#  define htole64(x) (x)
+#  define be64toh(x) __bswap_64(x)
+#  define le64toh(x) (x)
+# else
+#  define htobe16(x) (x)
+#  define htole16(x) __bswap_16(x)
+#  define be16toh(x) (x)
+#  define le16toh(x) __bswap_16(x)
+
+#  define htobe32(x) (x)
+#  define htole32(x) __bswap_32(x)
+#  define be32toh(x) (x)
+#  define le32toh(x) __bswap_32(x)
+
+#  define htobe64(x) (x)
+#  define htole64(x) __bswap_64(x)
+#  define be64toh(x) (x)
+#  define le64toh(x) __bswap_64(x)
+# endif
+#endif
+
 #endif
 
 /*
--
generated by git-patchbot for /home/xen/git/xen.git#master

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