Check for le32toh, le64toh, htole64 individually.

It appears that at least some versions of endian.h in glibc do not have
the latter two, so check for and replace each one individually.
bz#3794, ok djm@

Author: daztucker

configure.ac

@@ -536,6 +536,18 @@ AC_CHECK_HEADERS([ \
 	wchar.h \
 ])
 
+AC_CHECK_DECLS([le32toh, le64toh, htole64], [], [], [
+#ifdef HAVE_SYS_TYPES_H
+# include <sys/types.h>
+#endif
+#ifdef HAVE_STDINT_H
+# include <stdint.h>
+#endif
+#ifdef HAVE_ENDIAN_H
+# include <endian.h>
+#endif
+])
+
 # On some platforms (eg SunOS4) sys/audit.h requires sys/[time|types|label.h]
 # to be included first.
 AC_CHECK_HEADERS([sys/audit.h], [], [], [

defines.h

@@ -646,7 +646,9 @@ struct winsize {
 # endif /* WORDS_BIGENDIAN */
 #endif /* BYTE_ORDER */
 
-#ifndef HAVE_ENDIAN_H
+#if (defined(HAVE_DECL_LE32TOH) && HAVE_DECL_LE32TOH == 0) || \
+    (defined(HAVE_DECL_LE64TOH) && HAVE_DECL_LE64TOH == 0) || \
+    (defined(HAVE_DECL_HTOLE64) && HAVE_DECL_HTOLE64 == 0)
 # define openssh_swap32(v)					\
 	(uint32_t)(((uint32_t)(v) & 0xff) << 24 |		\
 	((uint32_t)(v) & 0xff00) << 8 |				\
@@ -662,13 +664,25 @@ struct winsize {
 	((uint64_t)(v) & 0xff000000000000ULL) >> 40 |		\
 	((uint64_t)(v) & 0xff00000000000000ULL) >> 56)
 # ifdef WORDS_BIGENDIAN
-#  define le32toh(v) (openssh_swap32(v))
-#  define le64toh(v) (openssh_swap64(v))
-#  define htole64(v) (openssh_swap64(v))
+#  if defined(HAVE_DECL_LE32TOH) && HAVE_DECL_LE32TOH == 0
+#   define le32toh(v) (openssh_swap32(v))
+#  endif
+#  if defined(HAVE_DECL_LE64TOH) && HAVE_DECL_LE64TOH == 0
+#   define le64toh(v) (openssh_swap64(v))
+#  endif
+#  if defined(HAVE_DECL_HTOLE64) && HAVE_DECL_HTOLE64 == 0
+#   define htole64(v) (openssh_swap64(v))
+# endif
 # else
-#  define le32toh(v) ((uint32_t)v)
-#  define le64toh(v) ((uint64_t)v)
-#  define htole64(v) ((uint64_t)v)
+#  if defined(HAVE_DECL_LE32TOH) && HAVE_DECL_LE32TOH == 0
+#   define le32toh(v) ((uint32_t)v)
+#  endif
+#  if defined(HAVE_DECL_LE64TOH) && HAVE_DECL_LE64TOH == 0
+#    define le64toh(v) ((uint64_t)v)
+#  endif
+#  if defined(HAVE_DECL_HTOLE64) && HAVE_DECL_HTOLE64 == 0
+#   define htole64(v) ((uint64_t)v)
+#  endif
 # endif
 #endif