Hello Douglas,
* Dr. Douglas C. MacKenzie wrote on Fri, Jan 29, 2010 at 09:29:31PM CET:
> I am having trouble with a configure.ac file after upgrading from
> libtool 1.5 to 2.2.6 as part of moving from Fedora 10 to Fedora 12.
[...]
> > AC_ARG_VAR(COMPILER, "Use COMPILER=MSC to compile for WIN32 using Microsoft C++ compiler.\nUse COMPILER=GCC to comnpile using GNU tools (default).\n")
> > if test "x$COMPILER" = "xMSC"; then
> > echo "Compiling using Microsoft C++ compiler"
> > dnl AC_LIBTOOL_WIN32_DLL
> > AC_SUBST(BUILD_WINDOWS, true)
> > else
> > echo "Compiling using GNU tools"
> > AC_SUBST(AM_CXXFLAGS, "-Wall")
> > fi
[...]
> The commands:
> autoreconf --force --install
> ./configure
> ./libtool --features
>
> generate:
> host: x86_64-unknown-linux-gnu
> enable shared libraries
> enable static libraries
>
> But, If I change the "dnl AC_LIBTOOL_WIN32_DLL" line to "
> AC_LIBTOOL_WIN32_DLL"
>
> The commands:
> autoreconf --force --install
> ./configure
> ./libtool --features
>
> Now generate:
> host:
> disable shared libraries
> enable static libraries
That's weird. Can you post the configure output in the second case?
This is a Libtool issue, not an Autoconf one.
That said, it should work to just move the AC_LIBTOOL_WIN32_DLL outside
of the if clause, so it is called unconditionally. Another thing you
can try is
AS_IF([CONDITION],
[IF-TRUE],
[IF-FALSE])
with Autoconf 2.60 or newer.
Another thing to note is that the AC_SUBST macro typically expands to no
shell code at all, and it anyway has unconditional effect, so
if $foo; then
AC_SUBST([bar])
fi
will unconditionally substitute @bar@, and likely cause a shell syntax
error.
Cheers,
Ralf
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