[libc] Move EOF macro to stdio-macros.h (#85159)

libc++ char_traits.h assumes EOF is always available

See #85158 for more details.

Author: petrhosek

libc/config/baremetal/api.td

@@ -52,6 +52,10 @@ def IntTypesAPI : PublicAPI<"inttypes.h"> {
   let Types = ["imaxdiv_t"];
 }
 
+def StdIOAPI : PublicAPI<"stdio.h"> {
+  let Types = ["size_t"];
+}
+
 def StdlibAPI : PublicAPI<"stdlib.h"> {
   let Types = [
     "div_t",

libc/config/gpu/api.td

@@ -63,7 +63,6 @@ def StdIOAPI : PublicAPI<"stdio.h"> {
     SimpleMacroDef<"_IOFBF", "0">,
     SimpleMacroDef<"_IOLBF", "1">,
     SimpleMacroDef<"_IONBF", "2">,
-    SimpleMacroDef<"EOF", "-1">,
   ];
   let Types = ["size_t", "FILE"];
 }

libc/config/linux/api.td

@@ -76,7 +76,6 @@ def StdIOAPI : PublicAPI<"stdio.h"> {
     SimpleMacroDef<"_IOFBF", "0">,
     SimpleMacroDef<"_IOLBF", "1">,
     SimpleMacroDef<"_IONBF", "2">,
-    SimpleMacroDef<"EOF", "-1">,
   ];
   let Types = ["size_t", "FILE", "cookie_io_functions_t"];
 }

libc/include/llvm-libc-macros/stdio-macros.h

@@ -9,6 +9,10 @@
 #ifndef LLVM_LIBC_MACROS_STDIO_MACROS_H
 #define LLVM_LIBC_MACROS_STDIO_MACROS_H
 
+#ifndef EOF
+#define EOF (-1)
+#endif
+
 #define BUFSIZ 1024
 
 #endif // LLVM_LIBC_MACROS_STDIO_MACROS_H