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libtool 2.2.4: circular dependency error

From: Andreas Schwab
Subject: libtool 2.2.4: circular dependency error
Date: Tue, 13 May 2008 16:54:58 +0200
User-agent: Gnus/5.110009 (No Gnus v0.9) Emacs/22.1 (gnu/linux)

The following configure.ac input creates a circular dependency error:

$ cat configure.ac
$ autoreconf -fi
configure.ac:5: error: m4_require: circular dependency of AC_LANG_COMPILER(C++)
../../lib/autoconf/lang.m4:271: AC_LANG_COMPILER_REQUIRE is expanded from...
../../lib/autoconf/general.m4:2517: AC_LINK_IFELSE is expanded from...
/usr/share/aclocal/libtool.m4:1018: _LT_SYS_MODULE_PATH_AIX is expanded from...
/usr/share/aclocal/libtool.m4:5305: _LT_LANG_CXX_CONFIG is expanded from...
/usr/share/aclocal/libtool.m4:785: _LT_LANG is expanded from...
/usr/share/aclocal/libtool.m4:768: LT_LANG is expanded from...
../../lib/autoconf/c.m4:769: AC_LANG_COMPILER(C++) is expanded from...
../../lib/autoconf/lang.m4:271: AC_LANG_COMPILER_REQUIRE is expanded from...
../../lib/autoconf/general.m4:2461: AC_COMPILE_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:508: AS_IF is expanded from...
../../lib/autoconf/general.m4:1973: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:1993: AC_CACHE_CHECK is expanded from...
../../lib/autoconf/headers.m4:622: AC_HEADER_STDC is expanded from...
configure.ac:5: the top level
autom4te: /usr/bin/m4 failed with exit status: 1
aclocal: autom4te failed with exit status: 1
autoreconf: aclocal failed with exit status: 1

When AC_PROG_LIBTOOL is commented out no error occurs and the generated
configure script works as expected.  Workaround is to explicitly add the
missing AC_PROG_CXX.


Andreas Schwab, SuSE Labs, address@hidden
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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