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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [config/] [no-executables.m4] - Rev 280
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# GCC_NO_EXECUTABLES # ----------------- # FIXME: The GCC team has specific needs which the current Autoconf # framework cannot solve elegantly. This macro implements a dirty # hack until Autoconf is able to provide the services its users # need. # # Several of the support libraries that are often built with GCC can't # assume the tool-chain is already capable of linking a program: the # compiler often expects to be able to link with some of such # libraries. # # In several of these libraries, workarounds have been introduced to # avoid the AC_PROG_CC_WORKS test, that would just abort their # configuration. The introduction of AC_EXEEXT, enabled either by # libtool or by CVS autoconf, have just made matters worse. # # Unlike the previous AC_NO_EXECUTABLES, this test does not # disable link tests at autoconf time, but at configure time. # This allows AC_NO_EXECUTABLES to be invoked conditionally. AC_DEFUN_ONCE([GCC_NO_EXECUTABLES], [m4_divert_push([KILL]) AC_BEFORE([$0], [_AC_COMPILER_EXEEXT]) AC_BEFORE([$0], [AC_LINK_IFELSE]) m4_define([_AC_COMPILER_EXEEXT], [AC_LANG_CONFTEST([AC_LANG_PROGRAM()]) # FIXME: Cleanup? AS_IF([AC_TRY_EVAL(ac_link)], [gcc_no_link=no], [gcc_no_link=yes]) if test x$gcc_no_link = xyes; then # Setting cross_compile will disable run tests; it will # also disable AC_CHECK_FILE but that's generally # correct if we can't link. cross_compiling=yes EXEEXT= else ]m4_defn([_AC_COMPILER_EXEEXT])dnl fi ) m4_define([AC_LINK_IFELSE], if test x$gcc_no_link = xyes; then AC_MSG_ERROR([Link tests are not allowed after [[$0]].]) fi m4_defn([AC_LINK_IFELSE])) dnl This is a shame. We have to provide a default for some link tests, dnl similar to the default for run tests. m4_define([AC_FUNC_MMAP], if test x$gcc_no_link = xyes; then if test "x${ac_cv_func_mmap_fixed_mapped+set}" != xset; then ac_cv_func_mmap_fixed_mapped=no fi fi if test "x${ac_cv_func_mmap_fixed_mapped}" != xno; then m4_defn([AC_FUNC_MMAP]) fi) m4_divert_pop()dnl ])# GCC_NO_EXECUTABLES # Use the strongest available test out of AC_TRY_COMPILE and AC_TRY_LINK. AC_DEFUN([GCC_TRY_COMPILE_OR_LINK], [if test x$gcc_no_link = xyes; then AC_TRY_COMPILE([$1], [$2], [$3], [$4]) else AC_TRY_LINK([$1], [$2], [$3], [$4]) fi])
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