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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])