proto: Added support for marshaling double-precision values.

[sysdb.git] / configure.ac

diff --git a/configure.ac b/configure.ac
index baf1137b530197b1689be9106ff4f9751b70377b..59f4ee7c413c0e5c5cdfeb2f66309d0e86d5d89e 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -341,6 +341,66 @@ fi
 AC_SUBST([PROFILING_CFLAGS])
 AC_SUBST([PROFILING_LDFLAGS])
 
 AC_SUBST([PROFILING_CFLAGS])
 AC_SUBST([PROFILING_LDFLAGS])
 

+ieee754_layout="unknown"
+AC_MSG_CHECKING([the memory layout of double precision values])
+AC_COMPILE_IFELSE(
+               [AC_LANG_PROGRAM(
+                       [[
+#include <string.h>
+#include <inttypes.h>
+                       ]],
+                       [[
+double d = 3.141592653e130;
+char c[8];
+if (sizeof(d) != 8)
+       return 2;
+memcpy(&c, &d, 8);
+if (c[0] == '\x04' && c[1] == '\x10' && c[2] == '\x1E' && c[3] == '\x66' &&
+       c[4] == '\x40' && c[5] == '\xA9' && c[6] == '\x06' && c[7] == '\x5B')
+       return 0;
+else
+       return 1;
+                       ]]
+               )],
+               [ieee754_layout="little-endian"], [ieee754_layout="unknown"])
+if test "x$ieee754_layout" = "xunknown"; then
+       AC_COMPILE_IFELSE(
+                       [AC_LANG_PROGRAM(
+                               [[
+#include <string.h>
+#include <inttypes.h>
+                               ]],
+                               [[
+double d = 3.141592653e130;
+char c[8];
+if (sizeof(d) != 8)
+       return 2;
+memcpy(&c, &d, 8);
+if (c[7] == '\x04' && c[6] == '\x10' && c[5] == '\x1E' && c[4] == '\x66' &&
+       c[3] == '\x40' && c[2] == '\xA9' && c[1] == '\x06' && c[0] == '\x5B')
+       return 0;
+else
+       return 1;
+                               ]]
+                       )],
+                       [ieee754_layout="big-endian"], [ieee754_layout="unknown"])
+fi
+AC_MSG_RESULT([IEEE-754 $ieee754_layout])
+
+AC_DEFINE([IEEE754_DOUBLE_LITTLE_ENDIAN], 1234,
+               [Identifier for IEEE-754 little-endian encoding of double precision values])
+AC_DEFINE([IEEE754_DOUBLE_BIG_ENDIAN], 4321,
+               [Identifier for IEEE-754 big-endian encoding of double precision values])
+if test "x$ieee754_layout" = "xlittle-endian"; then
+       AC_DEFINE([IEEE754_DOUBLE_BYTE_ORDER], 1234,
+                       [Define to 1 if double precision values use IEEE-754 little-endian encoding])
+else if test "x$ieee754_layout" = "xbig-endian"; then
+       AC_DEFINE([IEEE754_DOUBLE_BYTE_ORDER], 4321,
+                       [Define to 1 if double precision values use IEEE-754 little-endian encoding])
+else
+       AC_MSG_ERROR([Unknown memory layout of double precision values])
+fi; fi
+

 m4_divert_once([HELP_ENABLE], [
 Build dependencies:])
 
 m4_divert_once([HELP_ENABLE], [
 Build dependencies:])