question about running autoconf in newlib directory

[Jeff Johnston]

A long while back, we got around a problem in autoconf AC_PROG_CC which 
tries and build an executable to verify that the compiler is valid.  
Since we are building the library, this doesn't work.  The following is 
documented in our acinclude.m4:

# FIXME: We temporarily define our own version of AC_PROG_CC. This is
# copied from autoconf 2.12, but does not call AC_PROG_CC_WORKS. We
# are probably using a cross compiler, which will not be able to fully
# link an executable.  This should really be fixed in autoconf
# itself.

It is likely that some new check added in the current autoconf is noting 
we haven't called the base AC_PROG_CC macro and what it subsequently 
calls.  Although I have seen such warnings, I haven't seen any build 
issues so I have just left it alone for the time-being.

-- Jeff J.

On 07/26/2013 05:59 PM, Steve Ellcey wrote:
> While trying some things out in newlib and libgloss I was trying to
> run autoconf on those directories and I get this error when using
> autoconf 2.68 on the ToT newlib directory.  Has anyone else seen these
> messages?  The configure script that is in there now says it was built
> with autoconf 2.68.
>
> Steve Ellcey
> sellcey@mips.com
>
>
> % autoconf
> configure.in:207: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
> /home/sellcey/tools/tmp/autoconf-2.68/lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
> /home/sellcey/tools/tmp/autoconf-2.68/lib/autoconf/general.m4:2662: _AC_LINK_IFELSE is expanded from...
> /home/sellcey/tools/tmp/autoconf-2.68/lib/autoconf/general.m4:2679: AC_LINK_IFELSE is expanded from...
> ../libtool.m4:1080: _LT_SYS_MODULE_PATH_AIX is expanded from...
> ../libtool.m4:4207: _LT_LINKER_SHLIBS is expanded from...
> ../libtool.m4:5335: _LT_LANG_C_CONFIG is expanded from...
> ../libtool.m4:141: _LT_SETUP is expanded from...
> ../libtool.m4:67: LT_INIT is expanded from...
> ../libtool.m4:106: AM_PROG_LIBTOOL is expanded from...
> configure.in:207: the top level
> configure.in:207: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
> /home/sellcey/tools/tmp/autoconf-2.68/lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
> /home/sellcey/tools/tmp/autoconf-2.68/lib/autoconf/general.m4:2662: _AC_LINK_IFELSE is expanded from...
> /home/sellcey/tools/tmp/autoconf-2.68/lib/autoconf/general.m4:2679: AC_LINK_IFELSE is expanded from...
> ../libtool.m4:4207: _LT_LINKER_SHLIBS is expanded from...
> ../libtool.m4:5335: _LT_LANG_C_CONFIG is expanded from...
> ../libtool.m4:141: _LT_SETUP is expanded from...
> ../libtool.m4:67: LT_INIT is expanded from...
> ../libtool.m4:106: AM_PROG_LIBTOOL is expanded from...
> configure.in:207: the top level
>