| # 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]) |