1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
# ===========================================================================
# http://autoconf-archive.cryp.to/ax_gcc_option.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_GCC_OPTION(OPTION,EXTRA-OPTIONS,TEST-PROGRAM,ACTION-IF-SUCCESSFUL,ACTION-IF-NOT-SUCCESFUL)
#
# DESCRIPTION
#
# AX_GCC_OPTION checks wheter gcc accepts the passed OPTION. If it accepts
# the OPTION then ACTION-IF-SUCCESSFUL will be executed, otherwise
# ACTION-IF-UNSUCCESSFUL.
#
# NOTE: This macro will be obsoleted by AX_C_CHECK_FLAG AX_CXX_CHECK_FLAG,
# AX_CPP_CHECK_FLAG, AX_CXXCPP_CHECK_FLAG and AX_LD_CHECK_FLAG.
#
# A typical usage should be the following one:
#
# AX_GCC_OPTION([-fomit-frame-pointer],[],[],[
# AC_MSG_NOTICE([The option is supported])],[
# AC_MSG_NOTICE([No luck this time])
# ])
#
# The macro doesn't discriminate between languages so, if you are testing
# for an option that works for C++ but not for C you should use '-x c++'
# as EXTRA-OPTIONS:
#
# AX_GCC_OPTION([-fno-rtti],[-x c++],[],[ ... ],[ ... ])
#
# OPTION is tested against the following code:
#
# int main()
# {
# return 0;
# }
#
# The optional TEST-PROGRAM comes handy when the default main() is not
# suited for the option being checked
#
# So, if you need to test for -fstrict-prototypes option you should
# probably use the macro as follows:
#
# AX_GCC_OPTION([-fstrict-prototypes],[-x c++],[
# int main(int argc, char ** argv)
# {
# (void) argc;
# (void) argv;
#
# return 0;
# }
# ],[ ... ],[ ... ])
#
# Note that the macro compiles but doesn't link the test program so it is
# not suited for checking options that are passed to the linker, like:
#
# -Wl,-L<a-library-path>
#
# In order to avoid such kind of problems you should think about usinguse
# the AX_*_CHECK_FLAG family macros
#
# LAST MODIFICATION
#
# 2008-04-12
#
# COPYLEFT
#
# Copyright (c) 2008 Francesco Salvestrini <salvestrini@users.sourceforge.net>
# Copyright (c) 2008 Bogdan Drozdowski <bogdandr@op.pl>
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
# Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program. If not, see <http://www.gnu.org/licenses/>.
#
# As a special exception, the respective Autoconf Macro's copyright owner
# gives unlimited permission to copy, distribute and modify the configure
# scripts that are the output of Autoconf when processing the Macro. You
# need not follow the terms of the GNU General Public License when using
# or distributing such scripts, even though portions of the text of the
# Macro appear in them. The GNU General Public License (GPL) does govern
# all other use of the material that constitutes the Autoconf Macro.
#
# This special exception to the GPL applies to versions of the Autoconf
# Macro released by the Autoconf Macro Archive. When you make and
# distribute a modified version of the Autoconf Macro, you may extend this
# special exception to the GPL to apply to your modified version as well.
AC_DEFUN([AX_GCC_OPTION], [
AC_REQUIRE([AC_PROG_CC])
AC_MSG_CHECKING([if gcc accepts $1 option])
AS_IF([ test "x$GCC" = "xyes" ],[
AS_IF([ test -z "$3" ],[
ax_gcc_option_test="int main()
{
return 0;
}"
],[
ax_gcc_option_test="$3"
])
# Dump the test program to file
cat <<EOF > conftest.c
$ax_gcc_option_test
EOF
# Dump back the file to the log, useful for debugging purposes
AC_TRY_COMMAND(cat conftest.c 1>&AS_MESSAGE_LOG_FD)
AS_IF([ AC_TRY_COMMAND($CC $2 $1 -c conftest.c 1>&AS_MESSAGE_LOG_FD) ],[
AC_MSG_RESULT([yes])
$4
],[
AC_MSG_RESULT([no])
$5
])
],[
AC_MSG_RESULT([no gcc available])
])
])
|
