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-rw-r--r--m4/openssh.m4199
1 files changed, 199 insertions, 0 deletions
diff --git a/m4/openssh.m4 b/m4/openssh.m4
new file mode 100644
index 000000000..6a49f10fa
--- /dev/null
+++ b/m4/openssh.m4
@@ -0,0 +1,199 @@
1dnl OpenSSH-specific autoconf macros
2dnl
3
4dnl OSSH_CHECK_CFLAG_COMPILE(check_flag[, define_flag])
5dnl Check that $CC accepts a flag 'check_flag'. If it is supported append
6dnl 'define_flag' to $CFLAGS. If 'define_flag' is not specified, then append
7dnl 'check_flag'.
8AC_DEFUN([OSSH_CHECK_CFLAG_COMPILE], [{
9 AC_MSG_CHECKING([if $CC supports compile flag $1])
10 saved_CFLAGS="$CFLAGS"
11 CFLAGS="$CFLAGS $WERROR $1"
12 _define_flag="$2"
13 test "x$_define_flag" = "x" && _define_flag="$1"
14 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
15#include <stdlib.h>
16#include <stdio.h>
17int main(int argc, char **argv) {
18 (void)argv;
19 /* Some math to catch -ftrapv problems in the toolchain */
20 int i = 123 * argc, j = 456 + argc, k = 789 - argc;
21 float l = i * 2.1;
22 double m = l / 0.5;
23 long long int n = argc * 12345LL, o = 12345LL * (long long int)argc;
24 printf("%d %d %d %f %f %lld %lld\n", i, j, k, l, m, n, o);
25 /*
26 * Test fallthrough behaviour. clang 10's -Wimplicit-fallthrough does
27 * not understand comments and we don't use the "fallthrough" attribute
28 * that it's looking for.
29 */
30 switch(i){
31 case 0: j += i;
32 /* FALLTHROUGH */
33 default: j += k;
34 }
35 exit(0);
36}
37 ]])],
38 [
39if $ac_cv_path_EGREP -i "unrecognized option|warning.*ignored" conftest.err >/dev/null
40then
41 AC_MSG_RESULT([no])
42 CFLAGS="$saved_CFLAGS"
43else
44 AC_MSG_RESULT([yes])
45 CFLAGS="$saved_CFLAGS $_define_flag"
46fi],
47 [ AC_MSG_RESULT([no])
48 CFLAGS="$saved_CFLAGS" ]
49 )
50}])
51
52dnl OSSH_CHECK_CFLAG_LINK(check_flag[, define_flag])
53dnl Check that $CC accepts a flag 'check_flag'. If it is supported append
54dnl 'define_flag' to $CFLAGS. If 'define_flag' is not specified, then append
55dnl 'check_flag'.
56AC_DEFUN([OSSH_CHECK_CFLAG_LINK], [{
57 AC_MSG_CHECKING([if $CC supports compile flag $1 and linking succeeds])
58 saved_CFLAGS="$CFLAGS"
59 CFLAGS="$CFLAGS $WERROR $1"
60 _define_flag="$2"
61 test "x$_define_flag" = "x" && _define_flag="$1"
62 AC_LINK_IFELSE([AC_LANG_SOURCE([[
63#include <stdlib.h>
64#include <stdio.h>
65int main(int argc, char **argv) {
66 (void)argv;
67 /* Some math to catch -ftrapv problems in the toolchain */
68 int i = 123 * argc, j = 456 + argc, k = 789 - argc;
69 float l = i * 2.1;
70 double m = l / 0.5;
71 long long int n = argc * 12345LL, o = 12345LL * (long long int)argc;
72 long long int p = n * o;
73 printf("%d %d %d %f %f %lld %lld %lld\n", i, j, k, l, m, n, o, p);
74 exit(0);
75}
76 ]])],
77 [
78if $ac_cv_path_EGREP -i "unrecognized option|warning.*ignored" conftest.err >/dev/null
79then
80 AC_MSG_RESULT([no])
81 CFLAGS="$saved_CFLAGS"
82else
83 AC_MSG_RESULT([yes])
84 CFLAGS="$saved_CFLAGS $_define_flag"
85fi],
86 [ AC_MSG_RESULT([no])
87 CFLAGS="$saved_CFLAGS" ]
88 )
89}])
90
91dnl OSSH_CHECK_LDFLAG_LINK(check_flag[, define_flag])
92dnl Check that $LD accepts a flag 'check_flag'. If it is supported append
93dnl 'define_flag' to $LDFLAGS. If 'define_flag' is not specified, then append
94dnl 'check_flag'.
95AC_DEFUN([OSSH_CHECK_LDFLAG_LINK], [{
96 AC_MSG_CHECKING([if $LD supports link flag $1])
97 saved_LDFLAGS="$LDFLAGS"
98 LDFLAGS="$LDFLAGS $WERROR $1"
99 _define_flag="$2"
100 test "x$_define_flag" = "x" && _define_flag="$1"
101 AC_LINK_IFELSE([AC_LANG_SOURCE([[
102#include <stdlib.h>
103#include <stdio.h>
104int main(int argc, char **argv) {
105 (void)argv;
106 /* Some math to catch -ftrapv problems in the toolchain */
107 int i = 123 * argc, j = 456 + argc, k = 789 - argc;
108 float l = i * 2.1;
109 double m = l / 0.5;
110 long long int n = argc * 12345LL, o = 12345LL * (long long int)argc;
111 long long p = n * o;
112 printf("%d %d %d %f %f %lld %lld %lld\n", i, j, k, l, m, n, o, p);
113 exit(0);
114}
115 ]])],
116 [
117if $ac_cv_path_EGREP -i "unrecognized option|warning.*ignored" conftest.err >/dev/null
118then
119 AC_MSG_RESULT([no])
120 LDFLAGS="$saved_LDFLAGS"
121else
122 AC_MSG_RESULT([yes])
123 LDFLAGS="$saved_LDFLAGS $_define_flag"
124fi ],
125 [ AC_MSG_RESULT([no])
126 LDFLAGS="$saved_LDFLAGS" ]
127 )
128}])
129
130dnl OSSH_CHECK_HEADER_FOR_FIELD(field, header, symbol)
131dnl Does AC_EGREP_HEADER on 'header' for the string 'field'
132dnl If found, set 'symbol' to be defined. Cache the result.
133dnl TODO: This is not foolproof, better to compile and read from there
134AC_DEFUN([OSSH_CHECK_HEADER_FOR_FIELD], [
135# look for field '$1' in header '$2'
136 dnl This strips characters illegal to m4 from the header filename
137 ossh_safe=`echo "$2" | sed 'y%./+-%__p_%'`
138 dnl
139 ossh_varname="ossh_cv_$ossh_safe""_has_"$1
140 AC_MSG_CHECKING(for $1 field in $2)
141 AC_CACHE_VAL($ossh_varname, [
142 AC_EGREP_HEADER($1, $2, [ dnl
143 eval "$ossh_varname=yes" dnl
144 ], [ dnl
145 eval "$ossh_varname=no" dnl
146 ]) dnl
147 ])
148 ossh_result=`eval 'echo $'"$ossh_varname"`
149 if test -n "`echo $ossh_varname`"; then
150 AC_MSG_RESULT($ossh_result)
151 if test "x$ossh_result" = "xyes"; then
152 AC_DEFINE($3, 1, [Define if you have $1 in $2])
153 fi
154 else
155 AC_MSG_RESULT(no)
156 fi
157])
158
159dnl Check for socklen_t: historically on BSD it is an int, and in
160dnl POSIX 1g it is a type of its own, but some platforms use different
161dnl types for the argument to getsockopt, getpeername, etc. So we
162dnl have to test to find something that will work.
163AC_DEFUN([TYPE_SOCKLEN_T],
164[
165 AC_CHECK_TYPE([socklen_t], ,[
166 AC_MSG_CHECKING([for socklen_t equivalent])
167 AC_CACHE_VAL([curl_cv_socklen_t_equiv],
168 [
169 # Systems have either "struct sockaddr *" or
170 # "void *" as the second argument to getpeername
171 curl_cv_socklen_t_equiv=
172 for arg2 in "struct sockaddr" void; do
173 for t in int size_t unsigned long "unsigned long"; do
174 AC_TRY_COMPILE([
175 #include <sys/types.h>
176 #include <sys/socket.h>
177
178 int getpeername (int, $arg2 *, $t *);
179 ],[
180 $t len;
181 getpeername(0,0,&len);
182 ],[
183 curl_cv_socklen_t_equiv="$t"
184 break
185 ])
186 done
187 done
188
189 if test "x$curl_cv_socklen_t_equiv" = x; then
190 AC_MSG_ERROR([Cannot find a type to use in place of socklen_t])
191 fi
192 ])
193 AC_MSG_RESULT($curl_cv_socklen_t_equiv)
194 AC_DEFINE_UNQUOTED(socklen_t, $curl_cv_socklen_t_equiv,
195 [type to use in place of socklen_t if not defined])],
196 [#include <sys/types.h>
197#include <sys/socket.h>])
198])
199
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