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comparison config/gcc-plugin.m4 @ 111:04ced10e8804

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gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
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children 84e7813d76e9
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68:561a7518be6b 111:04ced10e8804
1 # gcc-plugin.m4 -*- Autoconf -*-
2 # Check whether GCC is able to be built with plugin support.
3
4 dnl Copyright (C) 2014 Free Software Foundation, Inc.
5 dnl This file is free software, distributed under the terms of the GNU
6 dnl General Public License. As a special exception to the GNU General
7 dnl Public License, this file may be distributed as part of a program
8 dnl that contains a configuration script generated by Autoconf, under
9 dnl 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.
14 AC_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 ])