M18-7-1: Address signal.h compiler compat

Better reflect how real compilers implement csignal.

Author: lcartey

cpp/autosar/test/rules/M18-7-1/CsignalFunctionsUsed.expected

@@ -1,4 +1,4 @@
-| test.cpp:7:3:7:13 | call to signal | Use of <csignal> function 'std::signal'. |
-| test.cpp:8:3:8:12 | call to raise | Use of <csignal> function 'std::raise'. |
+| test.cpp:7:3:7:13 | call to signal | Use of <csignal> function 'signal'. |
+| test.cpp:8:3:8:12 | call to raise | Use of <csignal> function 'raise'. |
 | test.cpp:11:3:11:8 | call to signal | Use of <csignal> function 'signal'. |
 | test.cpp:12:3:12:7 | call to raise | Use of <csignal> function 'raise'. |

cpp/autosar/test/rules/M18-7-1/CsignalTypesUsed.expected

@@ -1,2 +1,2 @@
-| test.cpp:6:8:6:19 | type mention | Use of <csignal> type 'std::sig_atomic_t'. |
+| test.cpp:6:8:6:19 | type mention | Use of <csignal> type 'sig_atomic_t'. |
 | test.cpp:10:3:10:14 | type mention | Use of <csignal> type 'sig_atomic_t'. |

cpp/common/test/includes/standard-library/csignal

@@ -10,13 +10,10 @@
 #define SIG_IGN 7
 #define SIG_ERR 8
 
-namespace std {
-typedef int sig_atomic_t;
-void (*signal(int, void (*func)(int)))(int);
-int raise(int sig);
-} // namespace std
+#include <signal.h>
 
-// global namespace
-typedef int sig_atomic_t;
-void (*signal(int, void (*func)(int)))(int);
-int raise(int);
+namespace std {
+using ::raise;
+using ::sig_atomic_t;
+using ::signal;
+} // namespace std

cpp/common/test/includes/standard-library/signal.h

@@ -0,0 +1,8 @@
+#ifndef _GHLIBCPP_SIGNAL
+#define _GHLIBCPP_SIGNAL
+
+typedef int sig_atomic_t;
+void (*signal(int, void (*func)(int)))(int);
+int raise(int);
+
+#endif // _GHLIBCPP_SIGNAL