1 dnl Copyright (C) 1993-2002 Free Software Foundation, Inc.
2 dnl This file is free software, distributed under the terms of the GNU
3 dnl General Public License. As a special exception to the GNU General
4 dnl Public License, this file may be distributed as part of a program
5 dnl that contains a configuration script generated by Autoconf, under
6 dnl the same distribution terms as the rest of that program.
8 dnl From Bruno Haible, Marcus Daniels.
12 AC_DEFUN([CL_GLOBAL_CONSTRUCTORS],
13 [AC_REQUIRE([CL_AS_UNDERSCORE])dnl
14 if test -n "$GCC"; then
15 AC_CACHE_CHECK(for the global constructors function prefix,
16 cl_cv_cplusplus_ctorprefix, [
17 cat > conftest.cc << EOF
18 struct foo { foo (); };
21 # look for the assembly language name in the .s file
22 AC_TRY_COMMAND(${CXX-g++} $CXXFLAGS -S conftest.cc) >/dev/null 2>&1
23 if grep '_GLOBAL_\$I\$foobar' conftest.s >/dev/null ; then
24 cl_cv_cplusplus_ctorprefix='_GLOBAL_$I$'
26 if grep '_GLOBAL_\.I\.foobar' conftest.s >/dev/null ; then
27 cl_cv_cplusplus_ctorprefix='_GLOBAL_.I.'
29 if grep '_GLOBAL__I_foobar' conftest.s >/dev/null ; then
30 cl_cv_cplusplus_ctorprefix='_GLOBAL__I_'
32 cl_cv_cplusplus_ctorprefix=unknown
38 if test "$cl_cv_cplusplus_ctorprefix" '!=' unknown; then
39 ac_value='"'"$cl_cv_cplusplus_ctorprefix"'"'
40 AC_DEFINE_UNQUOTED(CL_GLOBAL_CONSTRUCTOR_PREFIX,$ac_value)
41 AC_CACHE_CHECK(for the global destructors function prefix,
42 cl_cv_cplusplus_dtorprefix, [
43 cat > conftest.cc << EOF
44 struct foo { foo (); ~ foo (); };
47 # look for the assembly language name in the .s file
48 AC_TRY_COMMAND(${CXX-g++} $CXXFLAGS -S conftest.cc) >/dev/null 2>&1
49 if grep '_GLOBAL_\$D\$foobar' conftest.s >/dev/null ; then
50 cl_cv_cplusplus_dtorprefix='_GLOBAL_$D$'
52 if grep '_GLOBAL_\.D\.foobar' conftest.s >/dev/null ; then
53 cl_cv_cplusplus_dtorprefix='_GLOBAL_.D.'
55 if grep '_GLOBAL__D_foobar' conftest.s >/dev/null ; then
56 cl_cv_cplusplus_dtorprefix='_GLOBAL__D_'
58 cl_cv_cplusplus_dtorprefix=none
64 if test "$cl_cv_cplusplus_dtorprefix" '!=' none; then
65 ac_value='"'"$cl_cv_cplusplus_ctorprefix"'"'
66 AC_DEFINE_UNQUOTED(CL_GLOBAL_DESTRUCTOR_PREFIX,$ac_value)
68 dnl Check whether the global constructors/destructors functions are file-scope
69 dnl only by default. This is the case in egcs-1.1.2 or newer.
70 AC_CACHE_CHECK(whether the global constructors function need to be exported,
71 cl_cv_cplusplus_ctorexport, [
72 cat > conftest1.cc << EOF
73 struct foo { foo (); };
76 cat > conftest2.cc << EOF
79 #define ASM_UNDERSCORE_PREFIX "_"
81 #define ASM_UNDERSCORE_PREFIX ""
83 struct foo { foo (); };
85 extern "C" void ctor (void) __asm__ (ASM_UNDERSCORE_PREFIX CL_GLOBAL_CONSTRUCTOR_PREFIX "foobar");
86 int main() { ctor(); return 0; }
88 if AC_TRY_COMMAND(${CXX-g++} -o conftest${ac_exeext} $CXXFLAGS $CPPFLAGS $LDFLAGS conftest1.cc conftest2.cc $LIBS 1>&5) >/dev/null 2>&1 && test -s conftest${ac_exeext}; then
89 cl_cv_cplusplus_ctorexport=no
91 cl_cv_cplusplus_ctorexport=yes
95 if test "$cl_cv_cplusplus_ctorexport" = yes; then
96 AC_DEFINE(CL_NEED_GLOBALIZE_CTORDTOR)
98 dnl Test what suffix to give the global ctors inside shared object files.
99 if test "$enable_shared" = yes; then
100 AC_CACHE_CHECK([for the global constructor function suffix in shared objects],
101 cl_cv_cplusplus_ctorsuffix_pic, [
102 cat > conftest.cc << EOF
103 extern "C" void func () {}
108 AC_TRY_COMMAND(${CXX-g++} $CXXFLAGS ${lt_prog_compiler_pic_CXX-"-fPIC"} -S conftest.cc) >/dev/null 2>&1
109 if grep "${cl_cv_cplusplus_ctorprefix}conftest\.cc" conftest.s >/dev/null; then
110 cl_cv_cplusplus_ctorsuffix_pic='#module ".cc"'
112 cl_cv_cplusplus_ctorsuffix_pic='"cl_module__" #module "__firstglobalfun"'
116 AC_DEFINE_UNQUOTED([CL_GLOBAL_CONSTRUCTOR_SUFFIX_PIC(module)], [$cl_cv_cplusplus_ctorsuffix_pic])
118 dnl Test what suffix to give the global ctors inside static object files.
119 if test "$enable_static" = yes; then
120 AC_CACHE_CHECK([for the global constructor function suffix in static objects],
121 cl_cv_cplusplus_ctorsuffix_nopic, [
122 cat > conftest.cc << EOF
123 extern "C" void func () {}
128 AC_TRY_COMMAND(${CXX-g++} $CXXFLAGS -S conftest.cc) >/dev/null 2>&1
129 if grep "${cl_cv_cplusplus_ctorprefix}conftest\.cc" conftest.s >/dev/null; then
130 cl_cv_cplusplus_ctorsuffix_nopic='#module ".cc"'
132 cl_cv_cplusplus_ctorsuffix_nopic='"cl_module__" #module "__firstglobalfun"'
136 AC_DEFINE_UNQUOTED([CL_GLOBAL_CONSTRUCTOR_SUFFIX_NOPIC(module)], [$cl_cv_cplusplus_ctorsuffix_nopic])