source: trunk/libs/newlib/src/config/gcc-plugin.m4 @ 503

Last change on this file since 503 was 444, checked in by satin@…, 6 years ago

add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc

File size: 3.4 KB
RevLine 
[444]1# gcc-plugin.m4 -*- Autoconf -*-
2# Check whether GCC is able to be built with plugin support.
3
4dnl Copyright (C) 2014 Free Software Foundation, Inc.
5dnl This file is free software, distributed under the terms of the GNU
6dnl General Public License.  As a special exception to the GNU General
7dnl Public License, this file may be distributed as part of a program
8dnl that contains a configuration script generated by Autoconf, under
9dnl the same distribution terms as the rest of that program.
10
11# Check for plugin support.
12# Respects --enable-plugin.
13# Sets the shell variables enable_plugin and pluginlibs.
14AC_DEFUN([GCC_ENABLE_PLUGINS],
15  [# Check for plugin support
16   AC_ARG_ENABLE(plugin,
17   [AS_HELP_STRING([--enable-plugin], [enable plugin support])],
18   enable_plugin=$enableval,
19   enable_plugin=yes; default_plugin=yes)
20
21   pluginlibs=
22
23   case "${host}" in
24     *-*-darwin*)
25       if test x$build = x$host; then
26         export_sym_check="nm${exeext} -g"
27       elif test x$host = x$target; then
28         export_sym_check="$gcc_cv_nm -g"
29       else
30         export_sym_check=
31       fi
32     ;;
33     *)
34       if test x$build = x$host; then
35         export_sym_check="objdump${exeext} -T"
36       elif test x$host = x$target; then
37         export_sym_check="$gcc_cv_objdump -T"
38       else
39         export_sym_check=
40       fi
41     ;;
42   esac
43
44   if test x"$enable_plugin" = x"yes"; then
45
46     AC_MSG_CHECKING([for exported symbols])
47     if test "x$export_sym_check" != x; then
48       echo "int main() {return 0;} int foobar() {return 0;}" > conftest.c
49       ${CC} ${CFLAGS} ${LDFLAGS} conftest.c -o conftest$ac_exeext > /dev/null 2>&1
50       if $export_sym_check conftest$ac_exeext | grep -q foobar > /dev/null; then
51         : # No need to use a flag
52         AC_MSG_RESULT([yes])
53       else
54         AC_MSG_RESULT([yes])
55         AC_MSG_CHECKING([for -rdynamic])
56         ${CC} ${CFLAGS} ${LDFLAGS} -rdynamic conftest.c -o conftest$ac_exeext > /dev/null 2>&1
57         if $export_sym_check conftest$ac_exeext | grep -q foobar > /dev/null; then
58           plugin_rdynamic=yes
59           pluginlibs="-rdynamic"
60         else
61           plugin_rdynamic=no
62           enable_plugin=no
63         fi
64         AC_MSG_RESULT([$plugin_rdynamic])
65       fi
66     else
67       AC_MSG_RESULT([unable to check])
68     fi
69
70     # Check -ldl
71     saved_LIBS="$LIBS"
72     AC_SEARCH_LIBS([dlopen], [dl])
73     if test x"$ac_cv_search_dlopen" = x"-ldl"; then
74       pluginlibs="$pluginlibs -ldl"
75     fi
76     LIBS="$saved_LIBS"
77
78     # Check that we can build shared objects with -fPIC -shared
79     saved_LDFLAGS="$LDFLAGS"
80     saved_CFLAGS="$CFLAGS"
81     case "${host}" in
82       *-*-darwin*)
83         CFLAGS=`echo $CFLAGS | sed s/-mdynamic-no-pic//g`
84         CFLAGS="$CFLAGS -fPIC"
85         LDFLAGS="$LDFLAGS -shared -undefined dynamic_lookup"
86       ;;
87       *)
88         CFLAGS="$CFLAGS -fPIC"
89         LDFLAGS="$LDFLAGS -fPIC -shared"
90       ;;
91     esac
92     AC_MSG_CHECKING([for -fPIC -shared])
93     AC_TRY_LINK(
94       [extern int X;],[return X == 0;],
95       [AC_MSG_RESULT([yes]); have_pic_shared=yes],
96       [AC_MSG_RESULT([no]); have_pic_shared=no])
97     if test x"$have_pic_shared" != x"yes" -o x"$ac_cv_search_dlopen" = x"no"; then
98       pluginlibs=
99       enable_plugin=no
100     fi
101     LDFLAGS="$saved_LDFLAGS"
102     CFLAGS="$saved_CFLAGS"
103
104     # If plugin support had been requested but not available, fail.
105     if test x"$enable_plugin" = x"no" ; then
106       if test x"$default_plugin" != x"yes"; then
107         AC_MSG_ERROR([
108   Building GCC with plugin support requires a host that supports
109   -fPIC, -shared, -ldl and -rdynamic.])
110       fi
111     fi
112   fi
113])
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