[libc] Fix -Wincompatible-library-redeclaration for strerror

Return a char * instead of a const char * to silence this Clang warning.

2 files changed, 5 insertions, 4 deletions

diff --git a/lib/libc/include/string.h b/lib/libc/include/string.h
index adccf85d..2d3dc9d1 100644
--- a/lib/libc/include/string.h
+++ b/lib/libc/include/string.h
@@ -22,7 +22,7 @@ char       *strcat(char *, char const *);
 char       *strchr(char const *, int) __PURE;
 int         strcmp(char const *, char const *) __PURE;
 char       *strcpy(char *, char const *);
-char const *strerror(int) __CONST;
+char       *strerror(int) __CONST;
 size_t      strlen(char const *) __PURE;
 char       *strncat(char *, char const *, size_t);
 int         strncmp(char const *, char const *, size_t) __PURE;
diff --git a/lib/libc/string/strerror.c b/lib/libc/string/strerror.c
index f5f24306..e887fa9d 100644
--- a/lib/libc/string/strerror.c
+++ b/lib/libc/string/strerror.c
@@ -9,12 +9,13 @@
 #include <string.h>
 #include <sys/types.h>
 
-char const *
+char *
 strerror(int errnum) {
+    /* The C standard requires a non-const return type for backwards compat. */
     if (errnum < 0) {
-        return "General Error";
+        return (char *)"General Error";
     } else {
-        return "No Error";
+        return (char *)"No Error";
     }
 }