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Make GLX byteswap macros more portable

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- Use autoconf tests instead of platform-specific #ifdef's to decide
  which macros to use.
- Provide fallbacks for platforms like Solaris that don't provide any
  of the existing known forms.
This commit is contained in:
Alan Coopersmith 2007-01-03 15:44:55 -08:00
commit 2fd4626fa6
7 changed files with 146 additions and 45 deletions
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58
configure.ac
View file

@ -99,6 +99,64 @@ fi
AC_TYPE_PID_T
# Checks for headers/macros for byte swapping
# Known variants:
# <byteswap.h> bswap_16, bswap_32, bswap_64 (glibc)
# <sys/endian.h> __swap16, __swap32, __swap64 (OpenBSD)
# <sys/endian.h> bswap16, bswap32, bswap64 (other BSD's)
# and a fallback to local macros if none of the above are found
# if <byteswap.h> is found, assume it's the correct version
AC_CHECK_HEADERS([byteswap.h])
# if <sys/endian.h> is found, have to check which version
AC_CHECK_HEADER([sys/endian.h], [HAVE_SYS_ENDIAN_H="yes"], [HAVE_SYS_ENDIAN_H="no"])
if test "x$HAVE_SYS_ENDIAN_H" = "xyes" ; then
AC_MSG_CHECKING([for __swap16 variant of <sys/endian.h> byteswapping macros])
AC_LINK_IFELSE([AC_LANG_PROGRAM([
#include <sys/endian.h>
], [
int a = 1, b;
b = __swap16(a);
])
], [SYS_ENDIAN__SWAP='yes'], [SYS_ENDIAN__SWAP='no'])
AC_MSG_RESULT([$SYS_ENDIAN__SWAP])
AC_MSG_CHECKING([for bswap_16 variant of <sys/endian.h> byteswapping macros])
AC_LINK_IFELSE([AC_LANG_PROGRAM([
#include <sys/endian.h>
], [
int a = 1, b;
b = bswap_16(a);
])
], [SYS_ENDIAN_BSWAP='yes'], [SYS_ENDIAN_BSWAP='no'])
AC_MSG_RESULT([$SYS_ENDIAN_BSWAP])
if test "$SYS_ENDIAN_BSWAP" = "yes" ; then
USE_SYS_ENDIAN_H=yes
BSWAP=bswap_
else
if test "$SYS_ENDIAN__SWAP" = "yes" ; then
USE_SYS_ENDIAN_H=yes
BSWAP=__swap
else
USE_SYS_ENDIAN_H=no
fi
fi
if test "$USE_SYS_ENDIAN_H" = "yes" ; then
AC_DEFINE([USE_SYS_ENDIAN_H], 1,
[Define to use byteswap macros from <sys/endian.h>])
AC_DEFINE_UNQUOTED([bswap_16], ${BSWAP}16,
[Define to 16-bit byteswap macro])
AC_DEFINE_UNQUOTED([bswap_32], ${BSWAP}32,
[Define to 32-bit byteswap macro])
AC_DEFINE_UNQUOTED([bswap_64], ${BSWAP}64,
[Define to 64-bit byteswap macro])
fi
fi
dnl Checks for library functions.
AC_FUNC_VPRINTF
AC_CHECK_FUNCS([geteuid getuid link memmove memset mkstemp strchr strrchr \