diff options
| author | bfriesen <bfriesen> | 2007-06-26 20:05:33 +0000 |
|---|---|---|
| committer | bfriesen <bfriesen> | 2007-06-26 20:05:33 +0000 |
| commit | c1943a62e9ea0551149e7352855b418487deff9d (patch) | |
| tree | 6ebe238d1f3761142db3aa1c3980d029a3975a43 /configure.ac | |
| parent | bc048291cd0d12be621b9e38e501d937c9294114 (diff) | |
| download | libtiff-c1943a62e9ea0551149e7352855b418487deff9d.tar.gz | |
Added support for a TIFF_PTRDIFF_T type to use when doing pointer arithmetic.
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 30 |
1 files changed, 26 insertions, 4 deletions
diff --git a/configure.ac b/configure.ac index fd73004d..57a9e47c 100644 --- a/configure.ac +++ b/configure.ac @@ -99,8 +99,6 @@ dnl Checks for typedefs, structures, and compiler characteristics. AC_C_CONST AC_C_INLINE AC_C_BIGENDIAN -AC_CHECK_SIZEOF(int)dnl # This one does not seem to be needed any more. -AC_CHECK_SIZEOF(long)dnl # This one is needed by libtiff/tif_fax3.c AC_TYPE_OFF_T AC_TYPE_SIZE_T AC_HEADER_TIME @@ -128,8 +126,8 @@ AC_CHECK_SIZEOF(signed long) # Obtain size of a 'unsigned long' and define as SIZEOF_UNSIGNED_LONG AC_CHECK_SIZEOF(unsigned long) -# Obtain size of a 'long long' and define as SIZEOF_SIGNED_LONG_LONG. If -# 'long long' is not supported then the value defined is zero. +# Obtain size of a 'long long' and define as SIZEOF_SIGNED_LONG_LONG. +# If 'long long' is not supported then the value defined is zero. AC_CHECK_SIZEOF(signed long long) # Obtain size of a 'unsigned long long' and define as @@ -137,6 +135,11 @@ AC_CHECK_SIZEOF(signed long long) # supported then the value defined is zero. AC_CHECK_SIZEOF(unsigned long long) +# Obtain the size of an 'unsigned char *' and define as +# SIZEOF_UNSIGNED_CHAR_P. Result is available in +# ac_cv_sizeof_unsigned_char_p. +AC_CHECK_SIZEOF(unsigned char *) + AC_MSG_CHECKING(for signed 8-bit type) INT8_T='signed char' AC_MSG_RESULT($INT8_T) @@ -205,6 +208,25 @@ fi AC_MSG_RESULT($UINT64_T) AC_DEFINE_UNQUOTED(TIFF_UINT64_T,$UINT64_T,[Unsigned 64-bit type]) +# Determine the type to use for the difference between two pointers. +# We will default to the POSIX ptrdiff_t if it is available, but will +# be prepared for the case when it is not. +PTRDIFF_T='unknown' +AC_CHECK_TYPE(ptrdiff_t,[PTRDIFF_T=ptrdiff_t]) +if test $PTRDIFF_T = unknown +then + if test $ac_cv_sizeof_signed_long -eq $ac_cv_sizeof_unsigned_char_p + then + PTRDIFF_T='signed long' + elif test $ac_cv_sizeof_signed_long_long -eq $ac_cv_sizeof_unsigned_char_p + then + PTRDIFF_T='signed long long' + fi +fi +AC_MSG_CHECKING(for pointer difference type) +AC_MSG_RESULT($PTRDIFF_T) +AC_DEFINE_UNQUOTED(TIFF_PTRDIFF_T,$PTRDIFF_T,[Pointer difference type]) + dnl Some compilers (IBM VisualAge) has these types defined, so check it here: AC_CHECK_TYPES([int8, int16, int32],,, [ |