comparison config/no-executables.m4 @ 0:a06113de4d67

first commit
author kent <kent@cr.ie.u-ryukyu.ac.jp>
date Fri, 17 Jul 2009 14:47:48 +0900
parents
children 77e2b8dfacca
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-1:000000000000 0:a06113de4d67
1 # GCC_NO_EXECUTABLES
2 # -----------------
3 # FIXME: The GCC team has specific needs which the current Autoconf
4 # framework cannot solve elegantly. This macro implements a dirty
5 # hack until Autoconf is able to provide the services its users
6 # need.
7 #
8 # Several of the support libraries that are often built with GCC can't
9 # assume the tool-chain is already capable of linking a program: the
10 # compiler often expects to be able to link with some of such
11 # libraries.
12 #
13 # In several of these libraries, workarounds have been introduced to
14 # avoid the AC_PROG_CC_WORKS test, that would just abort their
15 # configuration. The introduction of AC_EXEEXT, enabled either by
16 # libtool or by CVS autoconf, have just made matters worse.
17 #
18 # Unlike the previous AC_NO_EXECUTABLES, this test does not
19 # disable link tests at autoconf time, but at configure time.
20 # This allows AC_NO_EXECUTABLES to be invoked conditionally.
21 AC_DEFUN_ONCE([GCC_NO_EXECUTABLES],
22 [m4_divert_push([KILL])
23
24 AC_BEFORE([$0], [_AC_COMPILER_EXEEXT])
25 AC_BEFORE([$0], [AC_LINK_IFELSE])
26
27 m4_define([_AC_COMPILER_EXEEXT],
28 AC_LANG_CONFTEST([AC_LANG_PROGRAM()])
29 # FIXME: Cleanup?
30 AS_IF([AC_TRY_EVAL(ac_link)], [gcc_no_link=no], [gcc_no_link=yes])
31 if test x$gcc_no_link = xyes; then
32 # Setting cross_compile will disable run tests; it will
33 # also disable AC_CHECK_FILE but that's generally
34 # correct if we can't link.
35 cross_compiling=yes
36 EXEEXT=
37 else
38 m4_defn([_AC_COMPILER_EXEEXT])dnl
39 fi
40 )
41
42 m4_define([AC_LINK_IFELSE],
43 if test x$gcc_no_link = xyes; then
44 AC_MSG_ERROR([Link tests are not allowed after [[$0]].])
45 fi
46 m4_defn([AC_LINK_IFELSE]))
47
48 dnl This is a shame. We have to provide a default for some link tests,
49 dnl similar to the default for run tests.
50 m4_define([AC_FUNC_MMAP],
51 if test x$gcc_no_link = xyes; then
52 if test "x${ac_cv_func_mmap_fixed_mapped+set}" != xset; then
53 ac_cv_func_mmap_fixed_mapped=no
54 fi
55 fi
56 if test "x${ac_cv_func_mmap_fixed_mapped}" != xno; then
57 m4_defn([AC_FUNC_MMAP])
58 fi)
59
60 m4_divert_pop()dnl
61 ])# GCC_NO_EXECUTABLES
62
63 # Use the strongest available test out of AC_TRY_COMPILE and AC_TRY_LINK.
64 AC_DEFUN([GCC_TRY_COMPILE_OR_LINK],
65 [if test x$gcc_no_link = xyes; then
66 AC_TRY_COMPILE([$1], [$2], [$3], [$4])
67 else
68 AC_TRY_LINK([$1], [$2], [$3], [$4])
69 fi])