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1 # GCC_NO_EXECUTABLES
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2 # -----------------
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3 # FIXME: The GCC team has specific needs which the current Autoconf
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4 # framework cannot solve elegantly. This macro implements a dirty
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5 # hack until Autoconf is able to provide the services its users
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6 # need.
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7 #
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8 # Several of the support libraries that are often built with GCC can't
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9 # assume the tool-chain is already capable of linking a program: the
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10 # compiler often expects to be able to link with some of such
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11 # libraries.
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12 #
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13 # In several of these libraries, workarounds have been introduced to
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14 # avoid the AC_PROG_CC_WORKS test, that would just abort their
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15 # configuration. The introduction of AC_EXEEXT, enabled either by
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16 # libtool or by CVS autoconf, have just made matters worse.
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17 #
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18 # Unlike the previous AC_NO_EXECUTABLES, this test does not
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19 # disable link tests at autoconf time, but at configure time.
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20 # This allows AC_NO_EXECUTABLES to be invoked conditionally.
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21 AC_DEFUN_ONCE([GCC_NO_EXECUTABLES],
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22 [m4_divert_push([KILL])
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23
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24 AC_BEFORE([$0], [_AC_COMPILER_EXEEXT])
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25 AC_BEFORE([$0], [AC_LINK_IFELSE])
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26
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27 m4_define([_AC_COMPILER_EXEEXT],
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28 AC_LANG_CONFTEST([AC_LANG_PROGRAM()])
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29 # FIXME: Cleanup?
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30 AS_IF([AC_TRY_EVAL(ac_link)], [gcc_no_link=no], [gcc_no_link=yes])
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31 if test x$gcc_no_link = xyes; then
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32 # Setting cross_compile will disable run tests; it will
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33 # also disable AC_CHECK_FILE but that's generally
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34 # correct if we can't link.
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35 cross_compiling=yes
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36 EXEEXT=
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37 else
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38 m4_defn([_AC_COMPILER_EXEEXT])dnl
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39 fi
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40 )
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41
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42 m4_define([AC_LINK_IFELSE],
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43 if test x$gcc_no_link = xyes; then
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44 AC_MSG_ERROR([Link tests are not allowed after [[$0]].])
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45 fi
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46 m4_defn([AC_LINK_IFELSE]))
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47
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48 dnl This is a shame. We have to provide a default for some link tests,
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49 dnl similar to the default for run tests.
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50 m4_define([AC_FUNC_MMAP],
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51 if test x$gcc_no_link = xyes; then
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52 if test "x${ac_cv_func_mmap_fixed_mapped+set}" != xset; then
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53 ac_cv_func_mmap_fixed_mapped=no
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54 fi
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55 fi
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56 if test "x${ac_cv_func_mmap_fixed_mapped}" != xno; then
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57 m4_defn([AC_FUNC_MMAP])
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58 fi)
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59
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60 m4_divert_pop()dnl
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61 ])# GCC_NO_EXECUTABLES
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62
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63 # Use the strongest available test out of AC_TRY_COMPILE and AC_TRY_LINK.
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64 AC_DEFUN([GCC_TRY_COMPILE_OR_LINK],
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65 [if test x$gcc_no_link = xyes; then
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66 AC_TRY_COMPILE([$1], [$2], [$3], [$4])
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67 else
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68 AC_TRY_LINK([$1], [$2], [$3], [$4])
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69 fi])
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