Use argv in OSSH_CHECK_CFLAG_COMPILE test.

configure.ac is not detecting -Wextra in compilers that implement the
option. The problem is that -Wextra implies -Wunused-parameter, and the
C excerpt used by aclocal.m4 does not use argv.  Patch from pedro at
ambientworks.net, ok djm@

2 files changed, 4 insertions, 0 deletions

diff --git a/aclocal.m4 b/aclocal.m4
index 0193c3dcc..b70856e43 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -15,6 +15,7 @@ AC_DEFUN([OSSH_CHECK_CFLAG_COMPILE], [{
 #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;
@@ -62,6 +63,7 @@ AC_DEFUN([OSSH_CHECK_CFLAG_LINK], [{
 #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;
@@ -100,6 +102,7 @@ AC_DEFUN([OSSH_CHECK_LDFLAG_LINK], [{
 #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;
diff --git a/configure.ac b/configure.ac
index ff7417354..81a6e31f9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -164,6 +164,7 @@ if test "$GCC" = "yes" || test "$GCC" = "egcs"; then
         OSSH_CHECK_CFLAG_COMPILE([-Wformat-security])
         OSSH_CHECK_CFLAG_COMPILE([-Wsizeof-pointer-memaccess])
         OSSH_CHECK_CFLAG_COMPILE([-Wpointer-sign], [-Wno-pointer-sign])
+        OSSH_CHECK_CFLAG_COMPILE([-Wunused-parameter], [-Wno-unused-parameter])
         OSSH_CHECK_CFLAG_COMPILE([-Wunused-result], [-Wno-unused-result])
         OSSH_CHECK_CFLAG_COMPILE([-Wimplicit-fallthrough])
         OSSH_CHECK_CFLAG_COMPILE([-fno-strict-aliasing])