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From:	Marco Atzeri <marco DOT atzeri AT gmail DOT com>
Subject:	Autoconf fooled by AC_FC_LINE_LENGTH
To:	"cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Message-ID:	<8fa2a8a5-fb86-02c9-5cd0-521a9680abe3@gmail.com>
Date:	Fri, 29 Jul 2016 14:23:53 +0200
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Hi Eric,

building latest Arpack
https://github.com/opencollab/arpack-ng/releases
https://github.com/opencollab/arpack-ng/issues/41

I hit a strange case where the presence of a single line

AC_FC_LINE_LENGTH(unlimited)

before the usual
LT_PREREQ([2.4.2])
LT_INIT([win32-dll])

is causing the libtool to be incorrectly set, versus
the right case
---------------------------------------------------
-libext=a
+libext=lib

-shlibpath_overrides_runpath=yes
+shlibpath_overrides_runpath=unknown

-library_names_spec="\$libname.dll.a"
+library_names_spec="\$libname`echo \$release | \$SED -e 
s/[.]/-/g`\$versuffix\$shared_ext \$libname.lib"

-soname_spec="`echo \$libname | sed -e s/^lib/cyg/``echo \$release | 
\$SED -e s/[.]/-/g`\$versuffix\$shared_ext"
+soname_spec=""
-----------------------------------------------------

It seems libtool is incorrectly set for MSVC platform

I tried to move the libtool inizialization before the
AC_FC_LINE_LENGTH but autoconf is objecting on wrong preference.

It seems a bug impacting only cygwin.

Regards
Marco










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