-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Eric Blake wrote: | According to Sam Steingold on 3/13/2008 1:57 PM: | | checking whether libffcall is installed... checking how to link with | | libavcall... -lavcall | | ... | | | checking for callback.h... no | | no | | ... | | Usually, this implies that you have done a cached check inside of another | cached check. Not only does this lead to poor output on a fresh configure | run, it leads to bugs on a './configure -C' run, because the nested checks | aren't even performed. | http://www.gnu.org/software/autoconf/manual/autoconf.html#Caching-Results I spent so much time looking at this (actually, at the corresponding page in emacs info) that I think I know it by heart. | Remember the rule of thumb: when using a cache variable, the | commands-to-set-it must have no side effects except for setting the | variable cache-id. yeah, sure. | | AC_CACHE_CHECK([whether libffcall is installed],[cl_cv_have_ffcall], | | [cl_cv_have_ffcall=no | | if test $cl_use_ffcall != no; then | | AC_LIB_FROMPACKAGE(avcall,libffcall) | | AC_LIB_FROMPACKAGE must be a cached call (however, it is not an autoconf | macro, so please consider renaming it to something that is namespace AC_LIB_FROMPACKAGE comes from gnulib/m4/lib-link.m4. | clean), but you are executing it inside of AC_CACHE_CHECK. Instead, you | should execute the cache check in isolation, then based on the setting of | $cl_cv_have_ffcall, execute AC_LIB_FROMPACKAGE as needed. the problem is no with AC_LIB_FROMPACKAGE but with AC_LIB_LINKFLAGS, AC_CHECK_HEADERS, and AC_SEARCH_LIBS. my problem is that cl_cv_have_ffcall is an amalgamation of other checked variables. are you suggesting that what I need is AC_DEFUN([CL_FFCALL],[dnl AC_ARG_WITH([ffcall], [AC_HELP_STRING([--with-ffcall],[use FFCALL (default is YES, if present)])], [cl_use_ffcall=$withval],[cl_use_ffcall=default]) if test $cl_use_ffcall != no; then AC_LIB_FROMPACKAGE(avcall,libffcall) AC_LIB_FROMPACKAGE(callback,libffcall) AC_LIB_LINKFLAGS([avcall]) AC_LIB_LINKFLAGS([callback]) AC_CHECK_HEADERS(avcall.h callback.h) if test "$ac_cv_header_avcall_h" = yes \ ~ -a "$ac_cv_header_callback_h" = yes then cl_save_LIBS="$LIBS" AC_LIB_APPENDTOVAR([LIBS], [$LIBAVCALL]) AC_LIB_APPENDTOVAR([LIBS], [$LIBCALLBACK]) AC_SEARCH_LIBS(__builtin_avcall) AC_SEARCH_LIBS(trampoline_r_data0) if test "$ac_cv_search___builtin_avcall" = no \ ~ -o "$ac_cv_search_trampoline_r_data0" = no then LIBS=$cl_save_LIBS fi fi AC_CACHE_CHECK([whether libffcall is installed],[cl_cv_have_ffcall], [if test "$ac_cv_header_avcall_h" = yes \ ~ -a "$ac_cv_header_callback_h" = yes \ ~ -a "$ac_cv_search___builtin_avcall" != no \ ~ -a "$ac_cv_search_trampoline_r_data0" != no then cl_cv_have_ffcall=yes else cl_cv_have_ffcall=no fi]) if test $cl_use_ffcall = yes -a $cl_cv_have_ffcall = no; then ~ FFCALL=ffcall-1.8 ~ AC_MSG_ERROR([despite --with-ffcall, FFCALL was not found ~ Either call configure without --with-ffcall or do ~ mkdir tools; cd tools; prefix=`pwd`/${ac_cv_host} ~ wget http://ftp.gnu.org/pub/gnu/ffcall/${FFCALL}.tar.gz ~ tar xfz ${FFCALL}.tar.gz ~ cd ${FFCALL} ~ ./configure --prefix=\${prefix} && make && make check && make install ~ cd ../.. ~ ./configure --with-libffcall-prefix=\${prefix} [$]*]) fi fi;])]) -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFH2otbPp1Qsf2qnMcRAnXEAJ4zN48kuTWfq2/lOr4GE5HlYSteVgCdE8Db YLrgSj9QMhDuApx1CNfa1jc= =7wQe -----END PGP SIGNATURE----- _______________________________________________ Autoconf mailing list Autoconf@xxxxxxx http://lists.gnu.org/mailman/listinfo/autoconf
