[libc] Move fileno and fdopen to fullbuild only (llvm#128762)

Both fileno and fdopen require interfacing with the opaque FILE struct,
so they shouldn't be enabled in overlay mode. This patch moves both into
fullbuild only on all platforms.

Fixes llvm#128643

Author: michaelrj-google

libc/config/linux/aarch64/entrypoints.txt

@@ -212,8 +212,6 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.stdlib.realloc
 
     # stdio.h entrypoints
-    libc.src.stdio.fdopen
-    libc.src.stdio.fileno
     libc.src.stdio.fprintf
     libc.src.stdio.fscanf
     libc.src.stdio.vfscanf
@@ -918,6 +916,7 @@ if(LLVM_LIBC_FULL_BUILD)
     libc.src.stdio.clearerr
     libc.src.stdio.clearerr_unlocked
     libc.src.stdio.fclose
+    libc.src.stdio.fdopen
     libc.src.stdio.feof
     libc.src.stdio.feof_unlocked
     libc.src.stdio.ferror
@@ -926,6 +925,7 @@ if(LLVM_LIBC_FULL_BUILD)
     libc.src.stdio.fgetc
     libc.src.stdio.fgetc_unlocked
     libc.src.stdio.fgets
+    libc.src.stdio.fileno
     libc.src.stdio.flockfile
     libc.src.stdio.fopen
     libc.src.stdio.fopencookie

libc/config/linux/riscv/entrypoints.txt

@@ -211,8 +211,6 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.stdlib.realloc
 
     # stdio.h entrypoints
-    libc.src.stdio.fdopen
-    libc.src.stdio.fileno
     libc.src.stdio.fprintf
     libc.src.stdio.fscanf
     libc.src.stdio.vfscanf
@@ -857,6 +855,7 @@ if(LLVM_LIBC_FULL_BUILD)
     libc.src.stdio.clearerr
     libc.src.stdio.clearerr_unlocked
     libc.src.stdio.fclose
+    libc.src.stdio.fdopen
     libc.src.stdio.feof
     libc.src.stdio.feof_unlocked
     libc.src.stdio.ferror
@@ -865,6 +864,7 @@ if(LLVM_LIBC_FULL_BUILD)
     libc.src.stdio.fgetc
     libc.src.stdio.fgetc_unlocked
     libc.src.stdio.fgets
+    libc.src.stdio.fileno
     libc.src.stdio.flockfile
     libc.src.stdio.fopen
     libc.src.stdio.fopencookie

libc/config/linux/x86_64/entrypoints.txt

@@ -211,8 +211,6 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.stdlib.realloc
 
     # stdio.h entrypoints
-    libc.src.stdio.fdopen
-    libc.src.stdio.fileno
     libc.src.stdio.fprintf
     libc.src.stdio.fscanf
     libc.src.stdio.vfscanf
@@ -1018,6 +1016,7 @@ if(LLVM_LIBC_FULL_BUILD)
     libc.src.stdio.clearerr
     libc.src.stdio.clearerr_unlocked
     libc.src.stdio.fclose
+    libc.src.stdio.fdopen
     libc.src.stdio.feof
     libc.src.stdio.feof_unlocked
     libc.src.stdio.ferror
@@ -1026,6 +1025,7 @@ if(LLVM_LIBC_FULL_BUILD)
     libc.src.stdio.fgetc
     libc.src.stdio.fgetc_unlocked
     libc.src.stdio.fgets
+    libc.src.stdio.fileno
     libc.src.stdio.flockfile
     libc.src.stdio.fopen
     libc.src.stdio.fopencookie

libc/src/stdio/generic/fileno.cpp

@@ -1,5 +1,4 @@
-//===-- Implementation of fileno
-//-------------------------------------------===//
+//===-- Implementation of fileno ------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.