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Diffstat (limited to 'NEWS')
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@@ -0,0 +1,660 @@ +* Major changes in Autoconf 2.52 -*- outline -*- +** Documentation +- AC_ARG_VAR +- Quadrigraphs + This feature was present in autoconf 2.50 but was not documented. + For example, `@<:@' is translated to `[' just before output. This + is useful when writing strings that contain unbalanced quotes, or + other hard-to-quote constructs. +- m4_pattern_forbid, m4_pattern_allow +- Tips for upgrading from 2.13. +- Using autoscan to maintain a configure.ac. + +** Default includes +- Now include stdint.h. +- sys/types.h and sys/stat.h are guarded. +- strings.h is included if available, and not conflicting with string.h. + +** Bug fixes +- The test suite is more robust and presents less false failures. +- Invocation of GNU M4 now robust to POSIXLY_CORRECT. +- configure accepts --prefix='' again. +- AC_CHECK_LIB works properly when its first argument is not a + literal. +- HAVE_INTTYPES_H is defined only if not conflicting with sys/types.h. +- build_, host_, and target_alias are AC_SUBST as in 2.13. +- AC_ARG_VAR properly propagates precious variables inherited from the + environment to ./config.status. +- Using --program-suffix/--program-prefix is portable. +- Failures to detect the default compiler's output extension are less + likely. +- `config.status foo' works properly when `foo' depends on variables + set in an AC_CONFIG_THING INIT-CMD. +- autoheader is more robust to broken input. +- Fixed Fortran name-mangling and link tests on a number of systems, + e.g. NetBSD; see AC_F77_DUMMY_MAIN, below. + +** Generic macros +- AC_CHECK_HEADER and AC_CHECK_HEADERS support a fourth argument to + specify pre-includes. In this case, the headers are compiled with + cc, not merely preprocessed by cpp. Therefore it is the _usability_ + of a header which is checked for, not just its availability. +- AC_ARG_VAR refuses to run configure when precious variables have + changed. +- Versions of compilers are dumped in the logs. +- AC_CHECK_TYPE recognizes use of `foo_t' as a replacement type. + +** Specific Macros +- AC_PATH_XTRA only adds -ldnet to $LIBS if it's needed to link. +- AC_FUNC_WAIT3 and AC_SYS_RESTARTABLE_SYSCALLS are obsoleted. +- AM_FUNC_ERROR_AT_LINE, AM_FUNC_FNMATCH, AM_FUNC_MKTIME, + AM_FUNC_OBSTACK, and AM_FUNC_STRTOD are now activated. + Be sure to read `Upgrading from Version 2.13' to understand why + running `autoupdate' is needed. +- AC_F77_DUMMY_MAIN, AC_F77_MAIN: new macros to detect whether + a main-like routine is required/possible when linking C/C++ with + Fortran. Users of e.g. AC_F77_WRAPPERS should be aware of these. +- AC_FUNC_GETPGRG behaves better when cross-compiling. + +* Major changes in Autoconf 2.50 + +** Lots of bug fixes +There have been far too many to enumerate them here. Check out +ChangeLog if you really want to know more. + +** Improved documentation +In particular, portability issues are better covered. + +** Use of Automake +All the standard GNU Makefile targets are supported. The layout has +changed: m4/ holds the m4 extensions Autoconf needs for its +configuration, doc/ contains the documentation, and tests/ contains +the test suite. + +** Man pages are provided +For autoconf, autoreconf, autoupdate, autoheader, autoscan, ifnames, +config.guess, config.sub. + +** autoconf +- --trace + Provides a safe and powerful means to trace the macro uses. This + provide the parsing layer for tools which need to `study' + configure.in. + +- --warnings + Specify what category of warnings should be enabled. + +- When recursing into subdirectories, try for configure.gnu before + configure to adapt for packages not using autoconf on case-insensitive + filesystems. + +- Diagnostics + More errors are now caught (circular AC_REQUIRE dependencies, + AC_DEFINE in the action part of an AC_CACHE_CHECK, too many pops + etc.). In addition, their location and call stack are given. + +** autoupdate +autoupdate is much more powerful, and is able to provide the glue code +which might be needed to move from an old macro to its newer +equivalent. + +You are strongly encouraged to use it to modernize both your +`configure.in' and your .m4 extension files. + +** autoheader +The internal machinery of autoheader has completely changed. As a +result, using `acconfig.h' should be considered to be obsoleted, and +you are encouraged to get rid of it using the AH macros. + +** autoreconf +Extensive overhaul. + +** Fortran 77 compilers +Globally, the support for Fortran 77 is considerably improved. + +Support for automatically determining a Fortran 77 compiler's +name-mangling scheme. New CPP macros F77_FUNC and F77_FUNC_ are +provided to wrap C/C++ identifiers, thus making it easier and more +transparent for C/C++ to call Fortran 77 routines, and Fortran 77 to +call C/C++ routines. See the Texinfo documentation for details. + +** Test suite +The test suite no longer uses DejaGNU. It should be easy to submit +test cases in this new framework. + +** configure +- --help, --help=long, -hl + no longer dumps useless items. +- --help=short, -hs + lists only specific options. +- --help=recursive, -hr + displays the help of all the embedded packages. +- Remembers environment variables when reconfiguring. + The previous scheme to set envvar before running configure was + ENV=VAL ./configure + what prevented configure from remembering the environment in which + it was run, therefore --recheck was run in an inconsistent + environment. Now, one should run + ./configure ENV=VAR + and then --recheck will work properly. Variables declared with + AC_ARG_VAR are also preserved. +- cross-compilation + $build defaults to `config.guess`, $host to $build, and then $target + to $host. + Cross-compilation is a global status of the package, it no longer + depends upon the current language. + Cross compilation is enabled iff the user specified `--host'. + `configure' now fails if it can't run the executables it compiles, + unless cross-compilation is enabled. +- Cache file + The cache file is disabled by default. The new options + `--config-cache', `-C' set the cache to `config.cache'. + +** config.status +- faster + Much faster on most architectures. +- concurrent executions + It is safe to use `make -j' with config.status. +- human interface improved + It is possible to invoke + ./config.status foobar + instead of the former form (still valid) + CONFIG_COMMANDS= CONFIG_HEADERS= CONFIG_LINKS= \ + CONFIG_FILES=foobar:foo.in:bar.in \ + ./config.status + The same holds for configuration headers and links. + You can instantiate unknown files and headers: + ./config.status --header foo.h:foo.h.in --file bar:baz +- has a useful --help +- accepts special file name "-" for stdin/stdout + + +** Identity Macros +- AC_COPYRIGHT + Specify additional copyright information. + +- AC_INIT + Now expects the identity of the package as argument. + +** General changes. +- Uniform quotation + Most macros, if not all, now strictly follow the `one quotation + level' rule. This results in a more predictable expansion. + +- AC_REQUIRE + A sly bug in the AC_REQUIRE machinery, which could produce incorrect + configure scripts, was fixed by Axel Thimm. + +** Setup Macros +- AC_ARG_VAR + Document and ask for the registration of an envvar. + +- AC_CONFIG_SRCDIR + Specifies the file which `configure' should look for when trying to + find the source tree (used to be handled by AC_INIT). + +- AC_CONFIG_COMMANDS + To add new actions to config.status. Should be used instead of + AC_OUTPUT_COMMANDS. + +- AC_CONFIG_LINKS + Replaces AC_LINK_FILES. + +- AC_CONFIG_HEADERS, AC_CONFIG_COMMANDS, AC_CONFIG_SUBDIRS, + AC_CONFIG_LINKS, and AC_CONFIG_FILES + They now obey sh: you should no longer use shell variables as + argument. Instead of + + test "$package_foo_enabled" = yes && $my_subdirs="$my_subdirs foo" + AC_CONFIG_SUBDIRS($my_subdirs) + + write + + if test "$package_foo_enabled" = yes; then + AC_CONFIG_SUBDIRS(foo) + fi + +- AC_HELP_STRING + To format an Autoconf macro's help string so that it looks pretty + when the user executes `configure --help'. + + +** Generic Test Macros +- AC_CHECK families + The interface of the AC_CHECK families of macros (decl, header, + type, member, func) is now uniform. They support the same set of + default includes. + +- AC_CHECK_DECL, AC_CHECK_DECLS + To check whether a symbol is declared. + +- AC_CHECK_SIZEOF, AC_C_CHAR_UNSIGNED. + No longer need a cross-compilation default. + +- AC_CHECK_TYPE + The test it performs is much more robust than previously, and makes + it possible to test builtin types in addition to typedefs. + It is now schizophrenic: + - AC_CHECK_TYPE(TYPE, REPLACEMENT) + remains for backward compatibility, but its use is discouraged. + - AC_CHECK_TYPE(TYPE, IF-FOUND, IF-NOT-FOUND, INCLUDES) + behaves exactly like the other AC_CHECK macros. + +- AC_CHECK_TYPES + Checks whether given types are supported by the system. + +- AC_CHECK_MEMBER, AC_CHECK_MEMBERS + Check for given members in aggregates (e.g., pw_gecos in struct + passwd). + +- AC_PROG_CC_STDC + Checks if the compiler supports ISO C, included when needs special + options. + +- AC_PROG_CPP + Checking whether the preprocessor indicates missing includes by the + error code. stderr is checked by AC_TRY_CPP only as a fallback. + +- AC_LANG + Takes a language as argument and replaces AC_LANG_C, + AC_LANG_CPLUSPLUS and AC_LANG_FORTRAN77. + +- AC_LANG_PUSH, AC_LANG_POP + Are preferred to AC_LANG_SAVE, AC_LANG_RESTORE. + +** Specific Macros +- AC_FUNC_CHOWN, AC_FUNC_MALLOC, AC_FUNC_STRERROR_R, + AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK, AC_FUNC_STAT, AC_FUNC_LSTAT, + AC_FUNC_ERROR_AT_LINE, AC_FUNC_OBSTACK, AC_FUNC_STRTOD, AC_FUNC_FSEEKO. + New. + +- AC_FUNC_GETGROUPS + Sets GETGROUPS_LIBS. + +- AC_FUNC_GETLOADAVG + Defines `HAVE_STRUCT_NLIST_N_UN_N_NAME' instead of `NLIST_NAME_UNION'. + +- AC_PROG_LEX + Now integrates `AC_DECL_YYTEXT' which is obsoleted. + +- AC_SYS_LARGEFILE + Arrange for large-file support. + +- AC_EXEEXT, AC_OBJEXT + You are no longer expected to use them: their computation is + performed by default. + +** C++ compatibility + Every macro has been revisited in order to support at best CC=c++. + +Major changes in Autoconf 2.14: + There was no release of GNU Autoconf 2.14. + +Major changes in Autoconf 2.13: + +* Support for building on Win32 systems where the only available C or + C++ compiler is the Microsoft Visual C++ command line compiler + (`cl'). Additional support for building on Win32 systems which are + using the Cygwin or Mingw32 environments. +* Support for alternative object file and executable file extensions. + On Win32, for example, these are .obj and .exe. These are discovered + using AC_OBJEXT and AC_EXEEXT, which substitute @OBJEXT@ and + @EXEEXT@ in the output, respectively. +* New macros: AC_CACHE_LOAD, AC_CACHE_SAVE, AC_FUNC_SELECT_ARGTYPES, + AC_VALIDATE_CACHED_SYSTEM_TUPLE, AC_SEARCH_LIBS, AC_TRY_LINK_FUNC, + AC_C_STRINGIZE, AC_CHECK_FILE(S), AC_PROG_F77 (and friends). +* AC_DEFINE now has an optional third argument for a description to be + placed in the config header input file (e.g. config.h.in). +* The C++ code fragment compiled for the C++ compiler test had to be + improved to include an explicit return type for main(). This was + causing failures on systems using recent versions of the EGCS C++ + compiler. +* Fixed an important bug in AC_CHECK_TYPE that would cause a configure + script to report that `sometype_t' was present when only `type_t' + was defined. +* Merge of the FSF version of config.guess and config.sub to modernise + these scripts. Add support for a few new hosts in config.guess. + Incorporate latest versions of install-sh, mkinstalldirs and + texinfo.tex from the FSF. +* autoreconf is capable of running automake if necessary (and + applicable). +* Support for Fortran 77. See the Texinfo documentation for details. +* Bug fixes and workarounds for quirky bugs in vendor utilities. + +Major changes in Autoconf 2.12: + +* AC_OUTPUT and AC_CONFIG_HEADER can create output files by + concatenating multiple input files separated by colons, like so: + AC_CONFIG_HEADER(config.h:conf.pre:config.h.in:conf.post) + AC_OUTPUT(Makefile:Makefile.in:Makefile.rules) + The arguments may be shell variables, to compute the lists on the fly. +* AC_LINK_FILES and AC_CONFIG_SUBDIRS may be called multiple times. +* New macro AC_OUTPUT_COMMANDS adds more commands to run in config.status. +* Bug fixes. + +Major changes in Autoconf 2.11: + +* AC_PROG_CC and AC_PROG_CXX check whether the compiler works. + They also default CFLAGS/CXXFLAGS to "-g -O2" for gcc, instead of "-g -O". +* AC_REPLACE_FUNCS defines HAVE_foo if the system has the function `foo'. +* AC_CONFIG_HEADER expands shell variables in its argument. +* New macros: AC_FUNC_FNMATCH, AC_FUNC_SETPGRP. +* The "checking..." messages and the source code for test programs that + fail are saved in config.log. +* Another workaround has been added for seds with small command length limits. +* config.sub and config.guess recognize more system types. +* Bug fixes. + +Major changes in Autoconf 2.10: + +* Bug fixes. +* The cache variable names used by `AC_CHECK_LIB(LIB, FUNC, ...)' has + changed: now $ac_cv_lib_LIB_FUNC, previously $ac_cv_lib_LIB. + +Major changes in Autoconfs 2.6 through 2.9: + +* Bug fixes. + +Major changes in Autoconf 2.5: + +* New configure options --bindir, --libdir, --datadir, etc., with + corresponding output variables. +* New macro: AC_CACHE_CHECK, to make using the cache easier. +* config.log contains the command being run as well as any output from it. +* AC_CHECK_LIB can check for libraries with "." or "/" or "+" in their name. +* AC_PROG_INSTALL doesn't cache a path to install-sh, for sharing caches. +* AC_CHECK_PROG, AC_PATH_PROG, AC_CHECK_PROGS, AC_PATH_PROGS, and + AC_CHECK_TOOL can search a path other than $PATH. +* AC_CHECK_SIZEOF takes an optional size to use when cross-compiling. + +Major changes in Autoconf 2.4: + +* Fix a few bugs found by Emacs testers. + +Major changes in Autoconf 2.3: + +* Fix the cleanup trap in several ways. +* Handle C compilers that are picky about option placement. +* ifnames gets the version number from the right directory. + +Major changes in Autoconf 2.2: + +* The ifnames utility is much faster but requires a "new awk" interpreter. +* AC_CHECK_LIB and AC_HAVE_LIBRARY check and add the new + library before existing libs, not after, in case it uses them. +* New macros: AC_FUNC_GETPGRP, AC_CHECK_TOOL. +* Lots of bug fixes. +* Many additions to the TODO file :-) + +Major changes in Autoconf 2.1: + +* Fix C++ problems. +* More explanations in the manual. +* Fix a spurious failure in the testsuite. +* Clarify some warning messages. +* autoreconf by default only rebuilds configure and config.h.in files + that are older than any of their particular input files; there is a + --force option to use after installing a new version of Autoconf. + +Thanks to everybody who's submitted changes and additions to Autoconf! +I've incorporated many of them, and am still considering others for +future releases -- but I didn't want to postpone this release indefinitely. + +Caution: don't indiscriminately rebuild configure scripts with +Autoconf version 2. Some configure.in files need minor adjustments to +work with it; the documentation has a chapter on upgrading. A few +configure.in files, including those for GNU Emacs and the GNU C +Library, need major changes because they relied on undocumented +internals of version 1. Future releases of those packages will have +updated configure.in files. + +It's best to use GNU m4 1.3 (or later) with Autoconf version 2. +Autoconf now makes heavy use of m4 diversions, which were implemented +inefficiently in GNU m4 releases before 1.3. + +Major changes in Autoconf 2.0: + +** New copyright terms: +* There are no restrictions on distribution or use of configure scripts. + +** Documentation: +* Autoconf manual is reorganized to make information easier to find + and has several new indexes. +* INSTALL is reorganized and clearer and is now made from Texinfo source. + +** New utilities: +* autoscan to generate a preliminary configure.in for a package by + scanning its source code for commonly used nonportable functions, + programs, and header files. +* ifnames to list the symbols used in #if and #ifdef directives in a + source tree. +* autoupdate to update a configure.in to use the version 2 macro names. +* autoreconf to recursively remake configure and configuration header + files in a source tree. + +** Changed utilities: +* autoheader can take pieces of acconfig.h to replace config.h.{top,bot}. +* autoconf and autoheader can look for package-local definition files + in an alternate directory. + +** New macros: +* AC_CACHE_VAL to share results of tests between configure runs. +* AC_DEFUN to define macros, automatically AC_PROVIDE them, and ensure + that macros invoked with AC_REQUIRE don't interrupt other macros. +* AC_CONFIG_AUX_DIR, AC_CANONICAL_SYSTEM, AC_CANONICAL_HOST, AC_LINK_FILES to + support deciding unguessable features based on the host and target types. +* AC_CONFIG_SUBDIRS to recursively configure a source tree. +* AC_ARG_PROGRAM to use the options --program-prefix, + --program-suffix, and --program-transform-name to change the names + of programs being installed. +* AC_PREFIX_DEFAULT to change the default installation prefix. +* AC_TRY_COMPILE to compile a test program without linking it. +* AC_CHECK_TYPE to check whether sys/types.h or stdlib.h defines a given type. +* AC_CHECK_LIB to check for a particular function and library. +* AC_MSG_CHECKING and AC_MSG_RESULT to print test results, on a single line, + whether or not the test succeeds. They obsolete AC_CHECKING and AC_VERBOSE. +* AC_SUBST_FILE to insert one file into another. +* AC_FUNC_MEMCMP to check whether memcmp is 8-bit clean. +* AC_FUNC_STRFTIME to find strftime even if it's in -lintl. +* AC_FUNC_GETMNTENT to find getmntent even if it's in -lsun or -lseq. +* AC_HEADER_SYS_WAIT to check whether sys/wait.h is POSIX.1 compatible. + +** Changed macros: +* Many macros renamed systematically, but old names are accepted for + backward compatibility. +* AC_OUTPUT adds the "automatically generated" comment to + non-Makefiles where it finds @configure_input@ in an input file, to + support files with various comment syntaxes. +* AC_OUTPUT does not replace "prefix" and "exec_prefix" in generated + files when they are not enclosed in @ signs. +* AC_OUTPUT allows the optional environment variable CONFIG_STATUS to + override the file name "config.status". +* AC_OUTPUT takes an optional argument for passing variables from + configure to config.status. +* AC_OUTPUT and AC_CONFIG_HEADER allow you to override the input-file names. +* AC_OUTPUT automatically substitutes the values of CFLAGS, CXXFLAGS, + CPPFLAGS, and LDFLAGS from the environment. +* AC_PROG_CC and AC_PROG_CXX now set CFLAGS and CXXFLAGS, respectively. +* AC_PROG_INSTALL looks for install-sh or install.sh in the directory + specified by AC_CONFIG_AUXDIR, or srcdir or srcdir/.. or + srcdir/../.. by default. +* AC_DEFINE, AC_DEFINE_UNQUOTED, and AC_SUBST are more robust and smaller. +* AC_DEFINE no longer prints anything, because of the new result reporting + mechanism (AC_MSG_CHECKING and AC_MSG_RESULT). +* AC_VERBOSE pays attention to --quiet/--silent, not --verbose. +* AC_ARG_ENABLE and AC_ARG_WITH support whitespace in the arguments to + --enable- and --with- options. +* AC_CHECK_FUNCS and AC_CHECK_HEADERS take optional shell commands to + execute on success or failure. +* Checking for C functions in C++ works. + +** Removed macros: +* AC_REMOTE_TAPE and AC_RSH removed; too specific to tar and cpio, and + better maintained with them. +* AC_ARG_ARRAY removed because no one was likely using it. +* AC_HAVE_POUNDBANG replaced with AC_SYS_INTERPRETER, which doesn't + take arguments, for consistency with all of the other specific checks. + +** New files: +* Comes with config.sub and config.guess, and uses them optionally. +* Uses config.cache to cache test results. An alternate cache file + can be selected with the --cache-file=FILE option. +* Uses optional shell scripts $prefix/share/config.site and + $prefix/etc/config.site to perform site or system specific initializations. +* configure saves compiler output to ./config.log for debugging. +* New files autoconf.m4 and autoheader.m4 load the other Autoconf macros. +* acsite.m4 is the new name for the system-wide aclocal.m4. +* Has a DejaGnu test suite. + +Major changes in Autoconf 1.11: + +* AC_PROG_INSTALL calls install.sh with the -c option. +* AC_SET_MAKE cleans up after itself. +* AC_OUTPUT sets prefix and exec_prefix if they weren't set already. +* AC_OUTPUT prevents shells from looking in PATH for config.status. + +Plus a few other bug fixes. + +Major changes in Autoconf 1.10: + +* autoheader uses config.h.bot if present, analogous to config.h.top. +* AC_PROG_INSTALL looks for install.sh in srcdir or srcdir/.. and + never uses cp. +* AC_PROG_CXX looks for cxx as a C++ compiler. + +Plus several bugs fixed. + +Major changes in Autoconf 1.9: + +* AC_YYTEXT_POINTER replaces AC_DECLARE_YYTEXT. +* AC_SIZEOF_TYPE generates the cpp symbol name automatically, + and autoheader generates entries for those names automatically. +* AC_FIND_X gets the result from xmkmf correctly. +* AC_FIND_X assumes no X if --without-x was given. +* AC_FIND_XTRA adds libraries to the variable X_EXTRA_LIBS. +* AC_PROG_INSTALL finds OSF/1 installbsd. + +Major changes in Autoconf 1.8: + +** New macros: +* New macros AC_LANG_C, AC_LANG_CPLUSPLUS, AC_LANG_SAVE, AC_LANG_RESTORE, + AC_PROG_CXX, AC_PROG_CXXCPP, AC_REQUIRE_CPP + for checking both C++ and C features in one configure script. +* New macros AC_CHECKING, AC_VERBOSE, AC_WARN, AC_ERROR for printing messages. +* New macros AC_FIND_XTRA, AC_MMAP, AC_SIZEOF_TYPE, AC_PREREQ, + AC_SET_MAKE, AC_ENABLE. + +** Changed macros: +* AC_FIND_X looks for X in more places. +* AC_PROG_INSTALL defaults to install.sh instead of cp, if it's in srcdir. + install.sh is distributed with Autoconf. +* AC_DECLARE_YYTEXT has been removed because it can't work, pending + a rewrite of quoting in AC_DEFINE. +* AC_OUTPUT adds its comments in C format when substituting in C files. +* AC_COMPILE_CHECK protects its ECHO-TEXT argument with double quotes. + +** New or changed command line options: +* configure accepts --enable-FEATURE[=ARG] and --disable-FEATURE options. +* configure accepts --without-PACKAGE, which sets withval=no. +* configure accepts --x-includes=DIR and --x-libraries=DIR. +* Giving --with-PACKAGE no argument sets withval=yes instead of withval=1. +* configure accepts --help, --version, --silent/--quiet, --no-create options. +* configure accepts and ignores most other Cygnus configure options, and + warns about unknown options. +* config.status accepts --help, --version options. + +** Paths and other changes: +* Relative srcdir values are not made absolute. +* The values of @prefix@ and @exec_prefix@ and @top_srcdir@ get substituted. +* Autoconf library files are installed in ${datadir}/autoconf, not ${datadir}. +* autoheader optionally copies config.h.top to the beginning of config.h.in. +* The example Makefile dependencies for configure et al. work better. +* Namespace cleanup: all shell variables used internally by Autoconf + have names beginning with `ac_'. + +More big improvements are in process for future releases, but have not +yet been (variously) finished, integrated, tested, or documented enough +to release yet. + +Major changes in Autoconf 1.7: + +* New macro AC_OBSOLETE. +* Bugs in Makefile.in fixed. +* AC_LONG_FILE_NAMES improved. + +Major changes in Autoconf 1.6: + +* New macro AC_LONG_64_BITS. +* Multiple .h files can be created. +* AC_FIND_X looks for X files directly if it doesn't find xmkmf. +* AC_ALLOCA defines C_ALLOCA if using alloca.c. +* --with-NAME can take a value, e.g., --with-targets=sun4,hp300bsd. +* Unused --no-create option to configure removed. +* autoheader doesn't change the timestamp of its output file if + the file didn't change. +* All macros that look for libraries now use AC_HAVE_LIBRARY. +* config.status checks three optional environment variables to + modify its behavior. +* The usual bug fixes. + +Major changes in Autoconf 1.5: + +* New macros AC_FIND_X, AC_OFF_T, AC_STAT_MACROS_BROKEN, AC_REVISION. +* autoconf and autoheader scripts have GNU standards conforming + --version and --help options (they print their message and exit). +* Many bug fixes. + +Major changes in Autoconf 1.4: + +* New macros AC_HAVE_POUNDBANG, AC_TIME_WITH_SYS_TIME, AC_LONG_DOUBLE, + AC_GETGROUPS_T, AC_DEFINE_UNQUOTED. +* autoconf and autoheader use the M4 environment variable to determine the + path of the m4 program to use. +* The --macrodir option to autoconf and autoheader specifies the directory + in which acspecific.m4, acgeneral.m4, etc. reside if not the default. +* autoconf and autoheader can take `-' as their file names, which means to + read stdin as input. +* Resulting configure scripts can take a --verbose option which causes them + to print the results of their tests. +* AC_DEFINE quotes its second argument in such a way that spaces, magic + shell characters, etc. will be preserved during various stages of + expansion done by the shell. If you don't want this, use + AC_DEFINE_UNQUOTED instead. +* Much textual processing done with external calls to tr and sed have been + internalized with builtin m4 `patsubst' and `translit' calls. +* AC_OUTPUT doesn't hardwire the filenames it outputs. Instead, you can + set the shell variables `gen_files' and `gen_config' to the list of + filenames to output. +* AC_DECLARE_YYTEXT does an AC_SUBST of `LEX_OUTPUT_ROOT', which may be + "lex.yy" or "lexyy", depending on the system. +* AC_PROGRAMS_CHECK takes an optional third arg. If given, it is used as + the default value. +* If AC_ALLOCA chooses alloca.c, it also defines STACK_DIRECTION. +* AC_CONST works much more reliably on more systems. +* Many bug fixes. + +Major changes in Autoconf 1.3: + +configure no longer requires awk for packages that use a config.h. +Support handling --with-PACKAGE options. +New `autoheader' script to create `config.h.in' from `configure.in'. +Ignore troublesome -lucb and -lPW when searching for alloca. +Rename --exec_prefix to --exec-prefix for GNU standards conformance. +Improve detection of STDC library. +Add AC_HAVE_LIBRARY to check for non-default libraries. +Function checking should work with future GNU libc releases. + +Major changes in Autoconf 1.2: + +The --srcdir option is now usually unnecessary. +Add a file containing sample comments describing CPP macros. +A comment in config.status tells which host it was configured on. +Substituted variable values can now contain commas. +Fix bugs in various feature checks. + +Major changes in Autoconf 1.1: + +Added AC_STRCOLL macro. +Made AC_GETLOADAVG check for more things. +AC_OUTPUT argument is now optional. +Various bug fixes. |