* libtool.m4 (AC_LIBTOOL_COMPILER_OPTION,

* libtool.m4 (AC_LIBTOOL_COMPILER_OPTION,
AC_LIBTOOL_PROG_CC_C_O): Changed method for compilation with
custom flags to be language-independent.  Thereby removed
CFLAGS/GCJFLAGS mixup bug.  Imitate Autoconf-style logging.
Log entries no longer discarded by compilation failures.
(_LT_AC_LANG_C_CONFIG, _LT_AC_LANG_CXX_CONFIG,
_LT_AC_LANG_GCJ_CONFIG): Tuned settings of
lt_simple_compile_test_code and lt_simple_link_test_code
to avoid warnings that could break some option detections.
(AC_LIBTOOL_PROG_COMPILER_NO_RTTI): Removed
redundant "-c conftest.$ac_ext" in the argument to
AC_LIBTOOL_COMPILER_OPTION.
(AC_LIBTOOL_PROG_LD_SHLIBS): Replaced C-specific conftest
source code with $lt_simple_compile_test_code, to support
the "-lc" test with other languages.