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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 | ]) |