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Index: include/stdio.h
===================================================================
--- include/stdio.h
+++ include/stdio.h
@@ -531,4 +531,7 @@
__END_DECLS
__NULLABILITY_PRAGMA_POP
+#if defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0
+#include <ssp/stdio.h>
+#endif
#endif /* !_STDIO_H_ */
Index: include/string.h
===================================================================
--- include/string.h
+++ include/string.h
@@ -170,4 +170,7 @@
#endif /* __EXT1_VISIBLE */
__END_DECLS
+#if defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0
+#include <ssp/string.h>
+#endif
#endif /* _STRING_H_ */
Index: include/strings.h
===================================================================
--- include/strings.h
+++ include/strings.h
@@ -70,4 +70,7 @@
#endif
__END_DECLS
+#if defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0
+#include <ssp/strings.h>
+#endif
#endif /* _STRINGS_H_ */
Index: include/unistd.h
===================================================================
--- include/unistd.h
+++ include/unistd.h
@@ -41,6 +41,10 @@
#include <sys/_null.h>
#include <sys/_types.h>
+#if defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0
+#include <ssp/unistd.h>
+#endif
+
#ifndef _GID_T_DECLARED
typedef __gid_t gid_t;
#define _GID_T_DECLARED
@@ -356,7 +360,10 @@
long pathconf(const char *, int);
int pause(void);
int pipe(int *);
+#if !defined(_FORTIFY_SOURCE) || __SSP_FORTIFY_LEVEL == 0
+/* Avoid redeclaration from _FORTIFY_SOURCE */
ssize_t read(int, void *, size_t);
+#endif
int rmdir(const char *);
int setgid(gid_t);
int setpgid(pid_t, pid_t);
Index: share/mk/bsd.sys.mk
===================================================================
--- share/mk/bsd.sys.mk
+++ share/mk/bsd.sys.mk
@@ -252,10 +252,19 @@
CXXFLAGS.clang+= -Wno-c++11-extensions
.if ${MK_SSP} != "no"
+FORTIFY_SOURCE?= 2
# Don't use -Wstack-protector as it breaks world with -Werror.
SSP_CFLAGS?= -fstack-protector-strong
CFLAGS+= ${SSP_CFLAGS}
+.else
+FORTIFY_SOURCE?= 0
.endif # SSP
+.if ${FORTIFY_SOURCE} > 0
+# We default FORTIFY_SOURCE=2 if SSP is enabled, or default it to 0 without.
+# The program or user can tweak it as needed.
+CFLAGS+= -D_FORTIFY_SOURCE=${FORTIFY_SOURCE}
+CXXFLAGS+= -D_FORTIFY_SOURCE=${FORTIFY_SOURCE}
+.endif
# Additional flags passed in CFLAGS and CXXFLAGS when MK_DEBUG_FILES is
# enabled.

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