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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=$enableval, | |
19 | enable_plugin=yes; default_plugin=yes) | |
20 | ||
21 | pluginlibs= | |
bf41f30d | 22 | plugin_check=yes |
49d00f48 L |
23 | |
24 | case "${host}" in | |
bf41f30d NC |
25 | *-*-mingw*) |
26 | # Since plugin support under MinGW is not as straightforward as on | |
27 | # other platforms (e.g., we have to link import library, etc), we | |
28 | # only enable it if explicitly requested. | |
29 | if test x"$default_plugin" = x"yes"; then | |
30 | enable_plugin=no | |
31 | elif test x"$enable_plugin" = x"yes"; then | |
32 | # Use make's target variable to derive import library name. | |
33 | pluginlibs='-Wl,--export-all-symbols -Wl,--out-implib=[$]@.a' | |
34 | plugin_check=no | |
35 | fi | |
36 | ;; | |
49d00f48 L |
37 | *-*-darwin*) |
38 | if test x$build = x$host; then | |
39 | export_sym_check="nm${exeext} -g" | |
40 | elif test x$host = x$target; then | |
41 | export_sym_check="$gcc_cv_nm -g" | |
42 | else | |
43 | export_sym_check= | |
44 | fi | |
45 | ;; | |
46 | *) | |
47 | if test x$build = x$host; then | |
48 | export_sym_check="objdump${exeext} -T" | |
49 | elif test x$host = x$target; then | |
50 | export_sym_check="$gcc_cv_objdump -T" | |
51 | else | |
52 | export_sym_check= | |
53 | fi | |
54 | ;; | |
55 | esac | |
56 | ||
bf41f30d | 57 | if test x"$enable_plugin" = x"yes" -a x"$plugin_check" = x"yes"; then |
49d00f48 L |
58 | |
59 | AC_MSG_CHECKING([for exported symbols]) | |
60 | if test "x$export_sym_check" != x; then | |
61 | echo "int main() {return 0;} int foobar() {return 0;}" > conftest.c | |
62 | ${CC} ${CFLAGS} ${LDFLAGS} conftest.c -o conftest$ac_exeext > /dev/null 2>&1 | |
c20c30f6 | 63 | if $export_sym_check conftest$ac_exeext | grep foobar > /dev/null; then |
49d00f48 L |
64 | : # No need to use a flag |
65 | AC_MSG_RESULT([yes]) | |
66 | else | |
67 | AC_MSG_RESULT([yes]) | |
68 | AC_MSG_CHECKING([for -rdynamic]) | |
69 | ${CC} ${CFLAGS} ${LDFLAGS} -rdynamic conftest.c -o conftest$ac_exeext > /dev/null 2>&1 | |
c20c30f6 | 70 | if $export_sym_check conftest$ac_exeext | grep foobar > /dev/null; then |
49d00f48 L |
71 | plugin_rdynamic=yes |
72 | pluginlibs="-rdynamic" | |
73 | else | |
74 | plugin_rdynamic=no | |
75 | enable_plugin=no | |
76 | fi | |
77 | AC_MSG_RESULT([$plugin_rdynamic]) | |
78 | fi | |
79 | else | |
80 | AC_MSG_RESULT([unable to check]) | |
81 | fi | |
82 | ||
83 | # Check -ldl | |
84 | saved_LIBS="$LIBS" | |
85 | AC_SEARCH_LIBS([dlopen], [dl]) | |
86 | if test x"$ac_cv_search_dlopen" = x"-ldl"; then | |
87 | pluginlibs="$pluginlibs -ldl" | |
88 | fi | |
89 | LIBS="$saved_LIBS" | |
90 | ||
91 | # Check that we can build shared objects with -fPIC -shared | |
92 | saved_LDFLAGS="$LDFLAGS" | |
93 | saved_CFLAGS="$CFLAGS" | |
94 | case "${host}" in | |
95 | *-*-darwin*) | |
96 | CFLAGS=`echo $CFLAGS | sed s/-mdynamic-no-pic//g` | |
97 | CFLAGS="$CFLAGS -fPIC" | |
98 | LDFLAGS="$LDFLAGS -shared -undefined dynamic_lookup" | |
99 | ;; | |
100 | *) | |
101 | CFLAGS="$CFLAGS -fPIC" | |
102 | LDFLAGS="$LDFLAGS -fPIC -shared" | |
103 | ;; | |
104 | esac | |
105 | AC_MSG_CHECKING([for -fPIC -shared]) | |
106 | AC_TRY_LINK( | |
107 | [extern int X;],[return X == 0;], | |
108 | [AC_MSG_RESULT([yes]); have_pic_shared=yes], | |
109 | [AC_MSG_RESULT([no]); have_pic_shared=no]) | |
110 | if test x"$have_pic_shared" != x"yes" -o x"$ac_cv_search_dlopen" = x"no"; then | |
111 | pluginlibs= | |
112 | enable_plugin=no | |
113 | fi | |
114 | LDFLAGS="$saved_LDFLAGS" | |
115 | CFLAGS="$saved_CFLAGS" | |
116 | ||
117 | # If plugin support had been requested but not available, fail. | |
118 | if test x"$enable_plugin" = x"no" ; then | |
119 | if test x"$default_plugin" != x"yes"; then | |
120 | AC_MSG_ERROR([ | |
121 | Building GCC with plugin support requires a host that supports | |
122 | -fPIC, -shared, -ldl and -rdynamic.]) | |
123 | fi | |
124 | fi | |
125 | fi | |
126 | ]) |