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Fix AC_TYPE_UINT64_T on Tru64 with gcc 3.4.4.

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* lib/autoconf/types.m4 (_AC_TYPE_UNSIGNED_INT_BODY)
(_AC_TYPE_INT_BODY): Avoid undefined behavior of attempting shift
wider than type.
* NEWS: Document this.
Reported by Rainer Orth.

Signed-off-by: Eric Blake <ebb9@byu.net>
This commit is contained in:
Eric Blake 2009-10-20 08:30:03 -06:00
parent b4d24c2af2
commit 15f8838bb6
3 changed files with 23 additions and 4 deletions
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9
ChangeLog
View File

@ -1,3 +1,12 @@
2009-10-20 Eric Blake <ebb9@byu.net>
Fix AC_TYPE_UINT64_T on Tru64 with gcc 3.4.4.
* lib/autoconf/types.m4 (_AC_TYPE_UNSIGNED_INT_BODY)
(_AC_TYPE_INT_BODY): Avoid undefined behavior of attempting shift
wider than type.
* NEWS: Document this.
Reported by Rainer Orth.
2009-10-17 Ralf Wildenhues <Ralf.Wildenhues@gmx.de>
Fix a couple of index entries in the manual.

4
NEWS
View File

@ -21,6 +21,10 @@ GNU Autoconf NEWS - User visible changes.
made it fail with some Fortran compilers (regression introduced in
2.64).
** The AC_TYPE_UINT64_T and AC_TYPE_INT64_T macros have been fixed to no
longer mistakenly select a 32-bit type on some compilers (bug present
since macros were introduced in 2.59c).
** The following documented autotest macros are new:
AT_CHECK_EUNIT

14
lib/autoconf/types.m4
View File

@ -629,17 +629,21 @@ m4_define([_AC_TYPE_INT_BODY],
[ AS_LINENO_PUSH([$[]1])
AC_CACHE_CHECK([for int$[]2_t], [$[]3],
[AS_VAR_SET([$[]3], [no])
# Order is important - never check a type that is potentially smaller
# than half of the expected target width.
for ac_type in int$[]2_t 'int' 'long int' \
'long long int' 'short int' 'signed char'; do
AC_COMPILE_IFELSE(
[AC_LANG_BOOL_COMPILE_TRY(
[AC_INCLUDES_DEFAULT],
[0 < ($ac_type) (((($ac_type) 1 << ($[]2 - 2)) - 1) * 2 + 1)])],
[enum { N = $[]2 / 2 - 1 };
0 < ($ac_type) ((((($ac_type) 1 << N) << N) - 1) * 2 + 1)])],
[AC_COMPILE_IFELSE(
[AC_LANG_BOOL_COMPILE_TRY(
[AC_INCLUDES_DEFAULT],
[($ac_type) (((($ac_type) 1 << ($[]2 - 2)) - 1) * 2 + 1)
< ($ac_type) (((($ac_type) 1 << ($[]2 - 2)) - 1) * 2 + 2)])],
[enum { N = $[]2 / 2 - 1 };
($ac_type) ((((($ac_type) 1 << N) << N) - 1) * 2 + 1)
< ($ac_type) ((((($ac_type) 1 << N) << N) - 1) * 2 + 2)])],
[],
[AS_CASE([$ac_type], [int$[]2_t],
[AS_VAR_SET([$[]3], [yes])],
@ -679,12 +683,14 @@ m4_define([_AC_TYPE_UNSIGNED_INT_BODY],
[ AS_LINENO_PUSH([$[]1])
AC_CACHE_CHECK([for uint$[]2_t], $[]3,
[AS_VAR_SET([$[]3], [no])
# Order is important - never check a type that is potentially smaller
# than half of the expected target width.
for ac_type in uint$[]2_t 'unsigned int' 'unsigned long int' \
'unsigned long long int' 'unsigned short int' 'unsigned char'; do
AC_COMPILE_IFELSE(
[AC_LANG_BOOL_COMPILE_TRY(
[AC_INCLUDES_DEFAULT],
[($ac_type) -1 >> ($[]2 - 1) == 1])],
[(($ac_type) -1 >> ($[]2 / 2 - 1)) >> ($[]2 / 2 - 1) == 3])],
[AS_CASE([$ac_type], [uint$[]2_t],
[AS_VAR_SET([$[]3], [yes])],
[AS_VAR_SET([$[]3], [$ac_type])])])