in testing for both arches. -Andy Changelog: * Major changes in Autoconf 2.62 (2008-04-05) [stable] Released by Eric Blake, based on git versions 2.61a.*. ** Many optimizations have been applied to make overall execution faster. ** Autotest now makes use of shell functions. ** config.status now uses awk instead of sed also for config headers. - As a side effect, AC_DEFINE and AC_DEFINE_UNQUOTED now handle multi-line values, i.e., backslash-newline combinations are handled correctly. Further, for config headers, the total size of values is not limited by the POSIX length limit of text lines any more, only each single line. ** New config variable `top_build_prefix'. ** New Autoconf macros: AC_AUTOCONF_VERSION AC_OPENMP AC_PATH_PROGS_FEATURE_CHECK ** AC_C_BIGENDIAN now supports universal binaries a la Mac OS X. ** AC_C_RESTRICT now prefers to #define 'restrict' to a variant spelling like '__restrict' if the variant spelling is available, as this is more likely to work when mixing C and C++ code. ** AC_CHECK_ALIGNOF's type argument T is now documented better: it must be a string of tokens such that "T y;" is a valid member declaration in a struct. ** AC_CHECK_SIZEOF now accepts objects as well as types: the general rule is that sizeof (X) works, then AC_CHECK_SIZEOF (X) should work. ** AC_CHECK_TYPE and AC_CHECK_TYPES now work on any C type-name; formerly, they did not work for function types. In C++, they now work on any type-id that can be the operand of sizeof; this is similar to C, except it excludes anonymous struct and union types. Formerly, some (but not all) C++ types involving anonymous struct and union were accepted, though this was not documented. ** AC_CONFIG_LINKS now prefers to link against files in the build tree if found, and it works to link against a file of the same name in the source tree, even if both trees coincide. ** AC_INIT no longer alters $@; regression introduced in 2.60. ** AC_USE_SYSTEM_EXTENSIONS now defines _ALL_SOURCE for Interix platforms. ** AS_HELP_STRING no longer underquotes its first argument; it also handles the case where the first argument contains single-quoted commas. For example, "AS_HELP_STRING([-a, [--arg[=foo]]], [bar])" produces: " -a, --arg[=foo] bar" Additionally, the macro now takes two additional arguments, indent-column and wrap-column; these should not normally be needed, but can be used to fine-tune how the output text is wrapped. ** AC_PROG_INSTALL now requires an install program that can install multiple files into a target directory. ** The command 'autoconf -' now correctly processes a file from stdin. ** 'autoreconf -m' now honors $MAKE. ** For all of the directory arguments for 'configure', such as '--prefix' or '--bindir', trailing slashes are stripped. As an example, if tab completion in the user's shell appends trailing slashes, the command './configure --prefix=/usr/' will still result in an expanded libdir value of /usr/lib, not /usr//lib. ** `configure --help=recursive' now works in read-only trees and from unconfigured build trees. ** If precious variables differ only in whitespace, then the cache consistency check warns instead of fails, and reuses the old value. ** AT_BANNER is now documented. ** AT_SETUP now handles macro expansions properly when calculating line length. ** Autotest now determines $srcdir correctly. ** Testsuites built by autotest now accept a -C/--directory=DIR option to adjust the working directory prior to creating files. ** Autoconf now requires GNU M4 1.4.5 or later. Earlier versions of M4 have a bug in macro tracing that interferes with the interaction between Autoconf and Automake. GNU M4 1.4.11 or later is recommended. The configure search for a working M4 is improved. ** For portability with the eventual M4 2.0, macros should no longer use anything larger than $9 to refer to arguments. ** Documentation for m4sugar is improved. - The following macros were previously available as undocumented interfaces; the macros are now documented as stable interfaces. __oline__ m4_assert m4_bmatch m4_bpatsubsts m4_car m4_case m4_cdr m4_default m4_divert_once m4_divert_pop m4_divert_push m4_divert_text m4_do m4_errprintn m4_fatal m4_flatten m4_ifndef m4_ifset m4_ifval m4_ifvaln m4_location m4_n m4_shiftn m4_strip m4_warn - The following macros were previously available as undocumented interfaces, but had bug fixes or semantic changes as part of this release. Packages that relied on the undocumented behavior should be analyzed to make sure they will still work with the new documented behavior. m4_cmp m4_list_cmp m4_join m4_map m4_map_sep m4_sign m4_text_box m4_text_wrap m4_version_compare - The m4_wrap macro used to have unspecified order, but now guarantees FIFO order. m4_wrap_lifo was added to guarantee LIFO order. - Packages using the undocumented m4sugar macro m4_PACKAGE_VERSION should consider using the new AC_AUTOCONF_VERSION instead. - m4sugar macros that are not documented in the manual are still deemed experimental, and should not be used outside of Autoconf. ** The m4sugar macros m4_append and m4_append_uniq, first documented in 2.60, have been fixed to treat both the string and the separator arguments consistently with regards to quoting. Prior to this fix, m4_append_uniq could mistakenly duplicate entries if the expansion of the separator resulted in a different string (for example, if it contained quotes, a comma, or a macro name). However, it means that programs previously using m4_append([name], [string], [[, ]]) are now using a four-character separator instead of the intended comma and space. If you need portability to earlier versions of Autoconf, you can insert the following snippet after AC_INIT but before any other macro expansions, to enforce the new semantics: m4_pushdef([m4_append], [m4_define([$1], m4_ifdef([$1], [m4_defn([$1])[$3]])[$2])]) Additionally, m4_append_uniq now takes optional parameters that can be used to take action depending on whether anything was appended, and warns if a non-empty separator occurs within the string being appended, since that can lead to duplicates. ** The following m4sugar macros are new: m4_append_uniq_w m4_apply m4_combine m4_cond m4_count m4_dquote_elt m4_echo m4_expand m4_ignore m4_make_list m4_max m4_min m4_newline m4_shift2 m4_shift3 m4_unquote m4_wrap_lifo ** Warnings are now generated by default when an installer invokes 'configure' with an unknown --enable-* or --with-* option. These warnings can be disabled with the new AC_DISABLE_OPTION_CHECKING macro, or by invoking 'configure' with --disable-option-checking. ** Existing obsolete macros The documentation for the following macros is adjusted to make it more clear that they have previously been marked obsolete, as their functionality can be accomplished by other macros. We have no current plans to remove them from Autoconf. AC_ENABLE AC_STRUCT_ST_BLKSIZE AC_STRUCT_ST_RDEV AC_WITH ** Newly obsolete macros The following macros have been marked obsolete, as they only perform a subset of AC_USE_SYSTEM_EXTENSIONS. We have no current plans to remove them. AC_AIX AC_GNU_SOURCE AC_ISC_POSIX AC_MINIX ** AC_C_LONG_DOUBLE is obsolescent. The documentation now says that AC_C_LONG_DOUBLE is obsolescent: it tests for problems that are so old that it is no longer of practical importance on current systems. New programs need not use AC_C_LONG_DOUBLE. We have no current plans to remove it. ** AC_DIAGNOSE, AC_WARNING, and AC_FATAL are obsolescent. The documentation now favors the use of M4sugar macros m4_warn and m4_fatal, since the naming makes it more obvious that the diagnostics are associated with M4 expansion (ie. when running `autoconf'), and offers less confusion with the AC_MSG_ERROR, AC_MSG_FAILURE, and AC_MSG_WARN macros which manage diagnostics when running `configure'. We have no current plans to remove these macros. * Major changes in Autoconf 2.61a (2006-12-11) ** AC_FUNC_FSEEKO was broken in 2.61; it didn't make fseeko and ftello visible on many platforms. This has been fixed. ** AC_FUNC_SETVBUF_REVERSED is now obsolete. It is still defined for backward compatibility but it does nothing. The macro was already obsolescent, as the last systems to have the problem were those based on SVR2, which became obsolete in 1987. The macro had bugs on some modern systems and could no longer be maintained reliably due to lack of ancient systems to test it on. ** config.status now uses awk instead of sed for most substitutions, for speed. - As a side effect multi-line values of substituted variables no longer have a small limit in total size, though for portability each line should not exceed the POSIX length limit for text lines. - It is now documented that Makefile.in should not contain overlapping variable occurrences, e.g., @VAR1@VAR2@. Autoconf's behavior was always iffy in such cases, and the awk implementation has changed the behavior. ** Many uses of 'echo' have been rewritten so that Autoconf-generated scripts have fewer problems with strings or file names containing embedded special characters such as backslash or leading "-". This was implemented by using `printf '%s\n' "$foo"' instead of `echo "$foo"' when printf works. Due to the implementation technique used, Autoconf-generated scripts now run considerably more slowly on ancient implementations lacking printf. However, this should not be a problem, since Autoconf-generated scripts in practice invariably find a more-modern shell these days.