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Hi all:
I've seen a bug in autoconf 2.49a that I downloaded from CVS
yesterday. I noted that when I used "AC_SEARCH_LIBS", the conftest*
files were not deleted. I then inspected the source code and I found
that when one calls the "..._IFELSE" macros with a "break"
ACTION-IF-FOUND (or ACTION-IF-NOT-FOUND), the macro ends without
deleting the files. In AC_SEARCH_LIBS, a loop check all the libraries
given, and a "break" is necessary to end when a suitable library has
been found.
AUTOCONF MAINTAINERS: please, note that this bug is deep in the
code, and it may require to inspect all the code. The "q&d" solution
I've found is checking all the "..._IFELSE" invocation and changing
them with temporal variables: For example, in
AC_TRY_LINK_FUNC([$1],
[ac_cv_search_$1="-l$ac_lib"
-break])
+ac_tmp_found_lib=1])
+if test $ac_tmp_found_lib ; then break ; fi
done
in which I've changed the break for a temporary variable that is
checked afterwards. Note that there aren't innecessary iterations, as
this test is just within the loop, but it lets the "..._IFELSE" macros
to end nicely as it's expected to.
I've included a patch for acgeneral.m4, but NOTE THAT THE REMAINIG .M4
FILES MAY ALSO BE IN ERROR.
The solution is:
1. Change the code of the macros calling ".._IFELSE" ones, or
2. Write a more robust ".._IFELSE" macros. One could think on
"catching" the breaks by surrounding the body of the macro inside a
while true, but this cannot prevent from a break n, where n is greater
than 1
3. Forbid the use of "break" in ACTIONs.
Regards and hope this helps.
diego.
--
Diego Sevilla Ruiz - http://ditec.um.es/~dsevilla/ - [EMAIL PROTECTED]
Departamento de Ingeniería y Tecnología de Computadores
Facultad de Informática. Universidad de Murcia
Campus de Espinardo - 30080 Murcia (SPAIN). Tel. +34-968-367570
PGP: http://pgp.rediris.es:11371/pks/lookup?op=get&search=0xC9B964B7
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$_="\\l/) (>". "_'\n<";@@= /.|\n/g;$_=
"\@". "\007f". "DDq". "DD5". "\204".
"\@". "DT4CE". "D54E". "DD". "\244".
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"GDAG". "DAGDT". "CqI";$c =0;$p =5;for$q
(/./g) {$q= ord$q; for(a, b){$z[$c]
=$@[$p+=($q&15) -4];$q>>=4;$c+=33 ;$c>98 &&($c-=98);}};print@z;
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--- acgeneral-old.m4 Mon Aug 7 14:33:18 2000
+++ acgeneral.m4 Thu Aug 17 02:44:43 2000
@@ -3151,7 +3151,8 @@
LIBS=3D"-l$ac_lib $5 $ac_func_search_save_LIBS"
AC_TRY_LINK_FUNC([$1],
[ac_cv_search_$1=3D"-l$ac_lib"
-break])
+ac_tmp_found_lib=3D1])
+if test $ac_tmp_found_lib ; then break ; fi
done
LIBS=3D$ac_func_search_save_LIBS])
AC_SHELL_IFELSE([test "$ac_cv_search_$1" !=3D no],
@@ -3580,14 +3581,16 @@
[ac_lo=3D0 ac_try=3D0
while true; do
AC_COMPILE_IFELSE([AC_LANG_BOOL_COMPILE_TRY([$3], [($1) <=3D $ac_try=
])],
- [ac_hi=3D$ac_try; break],
+ [ac_hi=3D$ac_try; ac_tmp_compiled=3D1],
[ac_lo=3D`expr $ac_try + 1`; ac_try=3D`expr 2 '*' $ac=
_try + 1`])
+ if test $ac_tmp_compiled ; then break; fi
done],
[ac_hi=3D-1 ac_try=3D-1
while true; do
AC_COMPILE_IFELSE([AC_LANG_BOOL_COMPILE_TRY([$3], [($1) >=3D $ac_try=
])],
- [ac_lo=3D$ac_try; break],
+ [ac_lo=3D$ac_try; ac_tmp_compiled=3D1],
[ac_hi=3D`expr $ac_try - 1`; ac_try=3D`expr 2 '*' =
$ac_try`])
+ if test $ac_tmp_compiled ; then break; fi
done])
# Binary search between lo and hi bounds.
while test "x$ac_lo" !=3D "x$ac_hi"; do
