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-rw-r--r--m4/openssh.m4203
1 files changed, 203 insertions, 0 deletions
diff --git a/m4/openssh.m4 b/m4/openssh.m4
new file mode 100644
index 0000000..8c33c70
--- /dev/null
+++ b/m4/openssh.m4
@@ -0,0 +1,203 @@
+dnl OpenSSH-specific autoconf macros
+dnl
+
+dnl OSSH_CHECK_CFLAG_COMPILE(check_flag[, define_flag])
+dnl Check that $CC accepts a flag 'check_flag'. If it is supported append
+dnl 'define_flag' to $CFLAGS. If 'define_flag' is not specified, then append
+dnl 'check_flag'.
+AC_DEFUN([OSSH_CHECK_CFLAG_COMPILE], [{
+ AC_MSG_CHECKING([if $CC supports compile flag $1])
+ saved_CFLAGS="$CFLAGS"
+ CFLAGS="$CFLAGS $WERROR $1"
+ _define_flag="$2"
+ test "x$_define_flag" = "x" && _define_flag="$1"
+ AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+#include <stdlib.h>
+#include <stdio.h>
+/* Trivial function to help test for -fzero-call-used-regs */
+void f(int n) {}
+int main(int argc, char **argv) {
+ (void)argv;
+ /* Some math to catch -ftrapv problems in the toolchain */
+ int i = 123 * argc, j = 456 + argc, k = 789 - argc;
+ float l = i * 2.1;
+ double m = l / 0.5;
+ long long int n = argc * 12345LL, o = 12345LL * (long long int)argc;
+ f(0);
+ printf("%d %d %d %f %f %lld %lld\n", i, j, k, l, m, n, o);
+ /*
+ * Test fallthrough behaviour. clang 10's -Wimplicit-fallthrough does
+ * not understand comments and we don't use the "fallthrough" attribute
+ * that it's looking for.
+ */
+ switch(i){
+ case 0: j += i;
+ /* FALLTHROUGH */
+ default: j += k;
+ }
+ exit(0);
+}
+ ]])],
+ [
+if $ac_cv_path_EGREP -i "unrecognized option|warning.*ignored" conftest.err >/dev/null
+then
+ AC_MSG_RESULT([no])
+ CFLAGS="$saved_CFLAGS"
+else
+ AC_MSG_RESULT([yes])
+ CFLAGS="$saved_CFLAGS $_define_flag"
+fi],
+ [ AC_MSG_RESULT([no])
+ CFLAGS="$saved_CFLAGS" ]
+ )
+}])
+
+dnl OSSH_CHECK_CFLAG_LINK(check_flag[, define_flag])
+dnl Check that $CC accepts a flag 'check_flag'. If it is supported append
+dnl 'define_flag' to $CFLAGS. If 'define_flag' is not specified, then append
+dnl 'check_flag'.
+AC_DEFUN([OSSH_CHECK_CFLAG_LINK], [{
+ AC_MSG_CHECKING([if $CC supports compile flag $1 and linking succeeds])
+ saved_CFLAGS="$CFLAGS"
+ CFLAGS="$CFLAGS $WERROR $1"
+ _define_flag="$2"
+ test "x$_define_flag" = "x" && _define_flag="$1"
+ AC_LINK_IFELSE([AC_LANG_SOURCE([[
+#include <stdlib.h>
+#include <stdio.h>
+int main(int argc, char **argv) {
+ (void)argv;
+ /* Some math to catch -ftrapv problems in the toolchain */
+ int i = 123 * argc, j = 456 + argc, k = 789 - argc;
+ float l = i * 2.1;
+ double m = l / 0.5;
+ long long int n = argc * 12345LL, o = 12345LL * (long long int)argc;
+ long long int p = n * o;
+ printf("%d %d %d %f %f %lld %lld %lld\n", i, j, k, l, m, n, o, p);
+ exit(0);
+}
+ ]])],
+ [
+if $ac_cv_path_EGREP -i "unrecognized option|warning.*ignored" conftest.err >/dev/null
+then
+ AC_MSG_RESULT([no])
+ CFLAGS="$saved_CFLAGS"
+else
+ AC_MSG_RESULT([yes])
+ CFLAGS="$saved_CFLAGS $_define_flag"
+fi],
+ [ AC_MSG_RESULT([no])
+ CFLAGS="$saved_CFLAGS" ]
+ )
+}])
+
+dnl OSSH_CHECK_LDFLAG_LINK(check_flag[, define_flag])
+dnl Check that $LD accepts a flag 'check_flag'. If it is supported append
+dnl 'define_flag' to $LDFLAGS. If 'define_flag' is not specified, then append
+dnl 'check_flag'.
+AC_DEFUN([OSSH_CHECK_LDFLAG_LINK], [{
+ AC_MSG_CHECKING([if $LD supports link flag $1])
+ saved_LDFLAGS="$LDFLAGS"
+ LDFLAGS="$LDFLAGS $WERROR $1"
+ _define_flag="$2"
+ test "x$_define_flag" = "x" && _define_flag="$1"
+ AC_LINK_IFELSE([AC_LANG_SOURCE([[
+#include <stdlib.h>
+#include <stdio.h>
+int main(int argc, char **argv) {
+ (void)argv;
+ /* Some math to catch -ftrapv problems in the toolchain */
+ int i = 123 * argc, j = 456 + argc, k = 789 - argc;
+ float l = i * 2.1;
+ double m = l / 0.5;
+ long long int n = argc * 12345LL, o = 12345LL * (long long int)argc;
+ long long p = n * o;
+ printf("%d %d %d %f %f %lld %lld %lld\n", i, j, k, l, m, n, o, p);
+ exit(0);
+}
+ ]])],
+ [
+if $ac_cv_path_EGREP -i "unrecognized option|warning.*ignored" conftest.err >/dev/null
+then
+ AC_MSG_RESULT([no])
+ LDFLAGS="$saved_LDFLAGS"
+else
+ AC_MSG_RESULT([yes])
+ LDFLAGS="$saved_LDFLAGS $_define_flag"
+fi ],
+ [ AC_MSG_RESULT([no])
+ LDFLAGS="$saved_LDFLAGS" ]
+ )
+}])
+
+dnl OSSH_CHECK_HEADER_FOR_FIELD(field, header, symbol)
+dnl Does AC_EGREP_HEADER on 'header' for the string 'field'
+dnl If found, set 'symbol' to be defined. Cache the result.
+dnl TODO: This is not foolproof, better to compile and read from there
+AC_DEFUN([OSSH_CHECK_HEADER_FOR_FIELD], [
+# look for field '$1' in header '$2'
+ dnl This strips characters illegal to m4 from the header filename
+ ossh_safe=`echo "$2" | sed 'y%./+-%__p_%'`
+ dnl
+ ossh_varname="ossh_cv_$ossh_safe""_has_"$1
+ AC_MSG_CHECKING(for $1 field in $2)
+ AC_CACHE_VAL($ossh_varname, [
+ AC_EGREP_HEADER($1, $2, [ dnl
+ eval "$ossh_varname=yes" dnl
+ ], [ dnl
+ eval "$ossh_varname=no" dnl
+ ]) dnl
+ ])
+ ossh_result=`eval 'echo $'"$ossh_varname"`
+ if test -n "`echo $ossh_varname`"; then
+ AC_MSG_RESULT($ossh_result)
+ if test "x$ossh_result" = "xyes"; then
+ AC_DEFINE($3, 1, [Define if you have $1 in $2])
+ fi
+ else
+ AC_MSG_RESULT(no)
+ fi
+])
+
+dnl Check for socklen_t: historically on BSD it is an int, and in
+dnl POSIX 1g it is a type of its own, but some platforms use different
+dnl types for the argument to getsockopt, getpeername, etc. So we
+dnl have to test to find something that will work.
+AC_DEFUN([TYPE_SOCKLEN_T],
+[
+ AC_CHECK_TYPE([socklen_t], ,[
+ AC_MSG_CHECKING([for socklen_t equivalent])
+ AC_CACHE_VAL([curl_cv_socklen_t_equiv],
+ [
+ # Systems have either "struct sockaddr *" or
+ # "void *" as the second argument to getpeername
+ curl_cv_socklen_t_equiv=
+ for arg2 in "struct sockaddr" void; do
+ for t in int size_t unsigned long "unsigned long"; do
+ AC_COMPILE_IFELSE([
+ AC_LANG_PROGRAM([[
+ #include <sys/types.h>
+ #include <sys/socket.h>
+ int getpeername (int, $arg2 *, $t *);
+ ]], [[
+ $t len;
+ getpeername(0,0,&len);
+ ]])
+ ],[
+ curl_cv_socklen_t_equiv="$t"
+ break
+ ])
+ done
+ done
+
+ if test "x$curl_cv_socklen_t_equiv" = x; then
+ AC_MSG_ERROR([Cannot find a type to use in place of socklen_t])
+ fi
+ ])
+ AC_MSG_RESULT($curl_cv_socklen_t_equiv)
+ AC_DEFINE_UNQUOTED(socklen_t, $curl_cv_socklen_t_equiv,
+ [type to use in place of socklen_t if not defined])],
+ [#include <sys/types.h>
+#include <sys/socket.h>])
+])
+