/[autoconf]/autoconf/lib/autoconf/lang.m4
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revision 1.165 by eggert, Wed Sep 3 00:35:53 2003 UTC revision 1.166 by drow, Mon Oct 20 15:57:45 2003 UTC
# Line 351  AC_DEFUN([AC_REQUIRE_CPP], Line 351  AC_DEFUN([AC_REQUIRE_CPP],
351  # -----------------  # -----------------
352  # FIXME: The GCC team has specific needs which the current Autoconf  # FIXME: The GCC team has specific needs which the current Autoconf
353  # framework cannot solve elegantly.  This macro implements a dirty  # framework cannot solve elegantly.  This macro implements a dirty
354  # hack until Autoconf is abble to provide the services its users  # hack until Autoconf is able to provide the services its users
355  # needs.  # need.
356  #  #
357  # Several of the support libraries that are often built with GCC can't  # Several of the support libraries that are often built with GCC can't
358  # assume the tool-chain is already capable of linking a program: the  # assume the tool-chain is already capable of linking a program: the
# Line 363  AC_DEFUN([AC_REQUIRE_CPP], Line 363  AC_DEFUN([AC_REQUIRE_CPP],
363  # avoid the AC_PROG_CC_WORKS test, that would just abort their  # avoid the AC_PROG_CC_WORKS test, that would just abort their
364  # configuration.  The introduction of AC_EXEEXT, enabled either by  # configuration.  The introduction of AC_EXEEXT, enabled either by
365  # libtool or by CVS autoconf, have just made matters worse.  # libtool or by CVS autoconf, have just made matters worse.
366    #
367    # Unlike an earlier version of this macro, using AC_NO_EXECUTABLES does
368    # not disable link tests at autoconf time, but at configure time.
369    # This allows AC_NO_EXECUTABLES to be invoked conditionally.
370  AC_DEFUN_ONCE([AC_NO_EXECUTABLES],  AC_DEFUN_ONCE([AC_NO_EXECUTABLES],
371  [m4_divert_push([KILL])  [m4_divert_push([KILL])
372    m4_divert_text([DEFAULTS], [ac_no_link=no])
373    
 AC_BEFORE([$0], [_AC_COMPILER_EXEEXT_WORKS])  
374  AC_BEFORE([$0], [_AC_COMPILER_EXEEXT])  AC_BEFORE([$0], [_AC_COMPILER_EXEEXT])
375    AC_BEFORE([$0], [AC_LINK_IFELSE])
 m4_define([_AC_COMPILER_EXEEXT_WORKS],  
 [cross_compiling=maybe  
 ])  
376    
377  m4_define([_AC_COMPILER_EXEEXT],  m4_define([_AC_COMPILER_EXEEXT],
378  [EXEEXT=  [AC_LANG_CONFTEST([AC_LANG_PROGRAM()])
379    if AC_TRY_EVAL(ac_link); then
380      ac_no_link=no
381      ]m4_defn([_AC_COMPILER_EXEEXT])[
382    else
383      ac_no_link=yes
384      # Setting cross_compile will disable run tests; it will
385      # also disable AC_CHECK_FILE but that's generally
386      # correct if we can't link.
387      cross_compiling=yes
388      EXEEXT=
389      _AC_COMPILER_EXEEXT_CROSS
390    fi
391  ])  ])
392    
393  m4_define([AC_LINK_IFELSE],  m4_define([AC_LINK_IFELSE],
394  [AC_FATAL([All the tests involving linking were disabled by $0])])  [if test x$ac_no_link = xyes; then
395      AC_MSG_ERROR([Link tests are not allowed after AC@&t@_NO_EXECUTABLES.])
396    fi
397    ]m4_defn([AC_LINK_IFELSE]))
398    
399  m4_divert_pop()dnl  m4_divert_pop()dnl
400  ])# AC_NO_EXECUTABLES  ])# AC_NO_EXECUTABLES

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