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331 lines
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331 lines
12 KiB
Plaintext
-*- outline -*-
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Things it might be nice to do someday. I haven't evaluated all of
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these suggestions... their presence here doesn't imply my endorsement.
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-djm
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------------------------------------------------------------------------------
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* Make AC_CHECK_LIB check whether the function is already available
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before checking for the library. This might involve adding another
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kind of cache variable to indicate whether a given function needs a
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given library. The current ac_cv_func_ variables are intended to
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indicate whether the function is in the default libraries, but
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actually also take into account whatever value LIBS had when they
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were checked for.
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------------------------------------------------------------------------------
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* Add AC_PROG_CC_POSIX to replace the current ad-hoc macros for AIX,
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Minix, ISC, etc.
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------------------------------------------------------------------------------
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* Use AC_EGREP_CPP instead of AC_TRY_LINK to detect structures and members.
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------------------------------------------------------------------------------
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* Make AC_CHECK_FUNC[S] automatically use any particular macros for the
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listed functions.
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------------------------------------------------------------------------------
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* Support creating both config.h and DEFS in the same configure.
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------------------------------------------------------------------------------
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* Select the right CONFIG_SHELL automatically (for Ultrix, Lynx especially.)
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------------------------------------------------------------------------------
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* Doc: Add concept index.
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------------------------------------------------------------------------------
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* Doc: Centralize information on POSIX, MS-DOS, cross-compiling, and
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other important topics.
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------------------------------------------------------------------------------
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* Split up AC_SUBST substitutions using a loop to accomodate shells
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with severely limited here document sizes, if it turns out to be a problem.
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I'm not sure whether the limit is on lines or bytes; if bytes, it
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will be less of a problem than it was with the long lines used for
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creating a header file.
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There has also been a report that HPUX and OSF/1 seds only allow 100
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commands.
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------------------------------------------------------------------------------
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* Allow [ and ] in egrep patterns and AC_DEFINE args.
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------------------------------------------------------------------------------
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* Add a Makefile generator that supports the standard GNU targets.
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(Being worked on.)
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------------------------------------------------------------------------------
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* Mike Haertel's suggestions:
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** Provide header files containing decls for alloca, strings, etc.
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** Cross compiling:
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*** Error messages include instructions for overriding defaults using
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config.site.
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*** Distribute a config.site corresponding to a hypothetical bare POSIX system with c89.
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*** Cache consistency checking: ignore cache if environment
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(CC or PATH) differs.
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** Site defaults:
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*** Convention for consistency checking of env vars and options in config.site so config.site can print obnoxious messages if it doesn't like options or env vars that users use.
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------------------------------------------------------------------------------
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* autoscan: Tell the files that caused inclusion of each macro,
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in a dnl comment. (Seems to be hard.)
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------------------------------------------------------------------------------
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* Look at user contributed macros:
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prototypes
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IEEE double precision math
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shared libraries
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------------------------------------------------------------------------------
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For AC_TYPE_SIGNAL signal handlers, provide a way for code to know
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whether to do "return 0" or "return" (int vs void) to avoid compiler
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warnings. (Roland McGrath)
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------------------------------------------------------------------------------
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In config.status comment, put the host/target/build types, if used.
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------------------------------------------------------------------------------
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Support a way of including makefile fragments that then have @var@
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substitutions done on them.
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------------------------------------------------------------------------------
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Have AC_CANONICAL_* cache the host/build/target types.
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They have to be overridden by the command line arguments,
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just as for X includes and libraries. Should they be cached
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all in one variable, or three? In that case, what if only one
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or two of the cache variables are set?
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------------------------------------------------------------------------------
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Look at contributions:
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ac_include (Karl Berry)
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aclocal.h tom@basil.icce.rug.NL (Tom R.Hageman)
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------------------------------------------------------------------------------
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The argument HELP-STRING is a description of the option which
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...
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Avoid tabs in the help string. You'll need to enclose it in `['
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and `]' in order to produce the leading spaces.
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Except that [...] is the convention for telling the user the default,
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So I guess a changequote(`,') or something would be in order in some cases.
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From: "K. Berry" <kb@cs.umb.edu>
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------------------------------------------------------------------------------
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The default of unlimited permission is fine, but there should be some easy
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way for configure to have copyright terms passed through from configure.in.
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Maybe AC_LICENSE([...]).
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From: roland@gnu.ai.mit.edu (Roland McGrath)
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------------------------------------------------------------------------------
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autoconf-2.1 AC_EGREP_HEADER does not work if [square brackets]
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are used in the egrep pattern. This makes egrep fairly useless to
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find, for example, a space or tab followed by something.
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Putting changequotes around the PATTERN parameter makes no difference.
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-Jim Avera (jima@netcom.com)
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------------------------------------------------------------------------------
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AC_MSG_CHECKING([checking for ANSI #stringize])
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AC_REVISION([ #(@) revision 2.1 ])
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causes bogus code to be generated for whatever immediately follows. The
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problem goes away if the '#' is removed. Probably the macros are not
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disabling the m4 "comment" feature when processing user-supplied strings.
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-Jim Avera jima@netcom.com
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------------------------------------------------------------------------------
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on hal.gnu.ai.mit.edu, configure is getting the wrong answer for
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AC_CHECK_FUNCS(select).
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The problem here is that there's severe namespace pollution: when
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conftest.c includes <ctype.h> to pick up any __stub macro definitions,
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it's getting a prototype declaration for select(), which collides
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with the dummy declaration in conftest.c. (The chain of includes
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is conftest.c -> <ctype.h> -> <sys/localedef.h> -> <sys/lc_core.h>
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-> <sys/types.h> -> <sys/select.h>.)
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#define $ac_func __dummy_$ac_func
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#include <ctype.h>
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#undef $ac_func
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From: kwzh@gnu.ai.mit.edu (Karl Heuer)
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------------------------------------------------------------------------------
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put all the config.* stuff somewhere like config/?
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All these extraneous files sure clutter up a toplevel directory.
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From: "Randall S. Winchester" <rsw@eng.umd.edu>
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------------------------------------------------------------------------------
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It would be nice if I could (in the Makefile.in files) set
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the path to config.h. You have config.h ../config.h ../../config.h's all
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over the place, in the findutils-4.1 directory.
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From: "Randall S. Winchester" <rsw@eng.umd.edu>
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------------------------------------------------------------------------------
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In libc and make in aclocal.m4 I have AC_CHECK_SYMBOL, which checks for
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sys_siglist et al. Using AC_CHECK_FUNC doesn't work on some system that
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winds up caring that you reference it as a function and it is really a
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variable. My version always declares the symbol as a char *[]; if that
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ends up a bad idea, we can have it take an arg with the C decl, but that is
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a bit verbose to write if it's actually superfluous.
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From Roland McGrath.
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[I'd call it AC_CHECK_VAR, I think. -djm]
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------------------------------------------------------------------------------
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In a future version (after 2.2), make AC_PROG_{CC,RANLIB,anything else}
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use AC_CHECK_TOOL.
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From Roland McGrath.
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------------------------------------------------------------------------------
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ls -lt configure configure.in | sort
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doesn't work right if configure.in is from a symlink farm, where the
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symlink has either a timestamp of its own, or under BSD 4.4, it has
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the timestamp of the current directory, neither of which
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helps. Changing it to
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ls -Llt configure configure.in | sort
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works for me, though I don't know how portable that is
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_Mark_ <eichin@cygnus.com>
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------------------------------------------------------------------------------
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Here is the thing I would like the most;
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AC_PKG_WITH(PACKAGE, HELP_STRING, PACKAGE-ROOT, PACKAGE-LIBS, PACKAGE-DEFS,
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PACKAGE-CCPFLAGS)
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like
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AC_PKG_WITH(kerberos,,/usr/local/athena,-lkrb -ldes,[KERBEROS KRB4
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CRYPT],include)
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AC_PKG_WITH(hesiod,
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[if hesiod is not in kerberos-root add --with-hesiod-root=somewhere]
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,,-lhesiod,HESIOD,,)
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AC_PKG_WITH(glue,,,-lglue,GLUE,,)
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AC_PKG_WITH(bind,,/usr/local/bind, [lib/resolv.a lib/lib44bsd.a], ,include)
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After the apropriate checks, the existance of the paths, and libs and such
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LIBS=$LIBS $PKG-LIBS
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DEFS=$DEFS $PKG-DEFS
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CPPFLAGS=$PKG-CPPFLAGS $CPPFLAGS
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$PKG-ROOT=$PKG-ROOT
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The cppflags should reverse the order so that you can have;
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-I/usr/local/bind/include -I/usr/local/athena/include
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and
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-L/usr/local/athena/lib -lkrb -ldes /usr/local/bind/lib/libresolv.a
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as order matters.
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also an AC_PKG_CHK_HEADER
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and an AC_PKG_CHK_FUNCTION
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so one can give alternate paths to check for stuff ($PKG-ROOT/lib for
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example)
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From: Randall Winchester
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------------------------------------------------------------------------------
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AC_C_CROSS assumes that configure was
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called like 'CC=target-gcc; ./configure'. I want to write a package
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that has target dependent libraries and host dependent tools. So I
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don't like to lose the distinction between CC and [G]CC_FOR_TARGET.
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AC_C_CROSS should check for equality of target and host.
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It would be great if
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GCC_FOR_TARGET
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AR_FOR_TARGET
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RANLIB_FOR_TARGET
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would be set automatically if host != target.
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AC_LANG_CROSS_C would be nice too, to check header files
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etc. with GCC_FOR_TARGET instead of CC
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Here is one simple test
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if test "x$host" != "x$target"; then
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AC_PROGRAMS_CHECK(AR_FOR_TARGET, $target-ar, $target-ar, ar)
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AC_PROGRAMS_CHECK(RANLIB_FOR_TARGET, $target-ranlib, $target-ranlib, ranlib)
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AC_PROGRAMS_CHECK(GCC_FOR_TARGET, $target-gcc, $target-gcc, gcc)
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fi
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This could be improved to also look for gcc in PATH, but require the
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prefix to contain the target e.g.:
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target=m68k-coff -->GCC_FOR_TARGET = /usr/gnu/m68k-coff/bin/gcc
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From: nennker@cs.tu-berlin.DE (Axel Nennker)
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------------------------------------------------------------------------------
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The problem occurs with the following libc functions in SunOS 5.4:
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fnmatch glob globfree regcomp regexec regerror regfree wordexp wordfree
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It also occurs with a bunch more libposix4 functions that most people
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probably aren't worried about yet, e.g. shm_open.
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All these functions fail with errno set to ENOSYS (89)
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``Operation not applicable''.
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Perhaps autoconf should have a
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specific macro for fnmatch, another for glob+globfree, another for
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regcomp+regexec+regerror+regfree, and another for wordexp+wordfree.
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This wouldn't solve the problem in general, but it should work for
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Solaris 2.4. Or autoconf could limit itself to fnmatch and regcomp,
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the only two functions that I know have been a problem so far.
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From Paul Eggert.
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------------------------------------------------------------------------------
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Make easy macros for checking for X functions and libraries.
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------------------------------------------------------------------------------
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Testing for ANSI header files (AC_HEADER_STDC) fails under linux when
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using the latest libraries (libc-4.6.30, at least libc-4.6.27 works
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ok) when LC_CTYPE is set to ISO-8859-1. The islower/toupper test
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reports errors.
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Anyway, adding a line like
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if test "${LC_CTYPE+set}" = set; then LC_CTYPE=C; export LC_CTYPE; fi
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to the configure script can solve the problem.
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From: tom@vlsivie.tuwien.ac.AT (Thomas Winder)
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------------------------------------------------------------------------------
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* Test suite: more things to test:
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** That the shell scripts produce correct output on some simple data.
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** Configuration header files. That autoheader does the right thing,
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and so does AC_CONFIG_HEADER when autoconf is run.
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------------------------------------------------------------------------------
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