Testsuite: fix analyzer tests on Darwin

On macOS, system headers redefine by default some macros (memcpy,
memmove, etc) to checked versions, which defeats the analyzer. We
want to turn this off.
See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104042

gcc/testsuite/ChangeLog:

	PR analyzer/104042
	* gcc.dg/analyzer/analyzer.exp: Pass -D_FORTIFY_SOURCE=0 on Darwin.
	* gcc.dg/analyzer/fd-bind.c: Add missing <string.h> header.
	* gcc.dg/analyzer/fd-datagram-socket.c: Likewise.
	* gcc.dg/analyzer/fd-listen.c: Likewise.
	* gcc.dg/analyzer/fd-socket-misuse.c: Likewise.
	* gcc.dg/analyzer/fd-stream-socket-active-open.c: Likewise.
	* gcc.dg/analyzer/fd-stream-socket-passive-open.c: Likewise.
	* gcc.dg/analyzer/fd-stream-socket.c: Likewise.
	* gcc.dg/analyzer/fd-symbolic-socket.c: Likewise.

gcc/testsuite/gcc.dg/analyzer/analyzer.exp

@@ -32,6 +32,14 @@ if [info exists DEFAULT_CFLAGS] then {
 # If a testcase doesn't have special options, use these.
 set DEFAULT_CFLAGS "-fanalyzer -Wanalyzer-too-complex -fanalyzer-call-summaries"
 
+if { [istarget "*-*-darwin*" ] } {
+  # On macOS, system headers redefine by default some macros (memcpy,
+  # memmove, etc) to checked versions, which defeats the analyzer. We
+  # want to turn this off.
+  # See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104042
+  set DEFAULT_CFLAGS "$DEFAULT_CFLAGS -D_FORTIFY_SOURCE=0"
+}
+
 # Initialize `dg'.
 dg-init
 

gcc/testsuite/gcc.dg/analyzer/fd-bind.c

@@ -1,6 +1,7 @@
 /* { dg-require-effective-target sockets } */
 /* { dg-skip-if "" { powerpc*-*-aix* } } */
 
+#include <string.h>
 #include <sys/socket.h>
 #include <sys/un.h>
 #include <unistd.h>

gcc/testsuite/gcc.dg/analyzer/fd-datagram-socket.c

@@ -1,6 +1,7 @@
 /* { dg-require-effective-target sockets } */
 /* { dg-skip-if "" { powerpc*-*-aix* } } */
 
+#include <string.h>
 #include <sys/socket.h>
 #include <sys/un.h>
 #include <unistd.h>

gcc/testsuite/gcc.dg/analyzer/fd-listen.c

@@ -1,6 +1,7 @@
 /* { dg-require-effective-target sockets } */
 /* { dg-skip-if "" { powerpc*-*-aix* } } */
 
+#include <string.h>
 #include <sys/socket.h>
 #include <sys/un.h>
 #include <unistd.h>

gcc/testsuite/gcc.dg/analyzer/fd-socket-misuse.c

@@ -3,6 +3,7 @@
 /* { dg-require-effective-target sockets } */
 /* { dg-skip-if "" { powerpc*-*-aix* } } */
 
+#include <string.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>

gcc/testsuite/gcc.dg/analyzer/fd-stream-socket-active-open.c

@@ -1,6 +1,7 @@
 /* { dg-require-effective-target sockets } */
 /* { dg-skip-if "" { powerpc*-*-aix* } } */
 
+#include <string.h>
 #include <sys/socket.h>
 #include <sys/un.h>
 #include <unistd.h>

gcc/testsuite/gcc.dg/analyzer/fd-stream-socket-passive-open.c

@@ -5,6 +5,7 @@
 /* { dg-require-effective-target sockets } */
 /* { dg-skip-if "" { powerpc*-*-aix* } } */
 
+#include <string.h>
 #include <sys/socket.h>
 #include <sys/un.h>
 #include <unistd.h>

gcc/testsuite/gcc.dg/analyzer/fd-stream-socket.c

@@ -1,6 +1,7 @@
 /* { dg-require-effective-target sockets } */
 /* { dg-skip-if "" { powerpc*-*-aix* } } */
 
+#include <string.h>
 #include <sys/socket.h>
 #include <sys/un.h>
 #include <unistd.h>

gcc/testsuite/gcc.dg/analyzer/fd-symbolic-socket.c

@@ -1,6 +1,7 @@
 /* { dg-require-effective-target sockets } */
 /* { dg-skip-if "" { powerpc*-*-aix* } } */
 
+#include <string.h>
 #include <sys/socket.h>
 #include <sys/un.h>
 #include <unistd.h>