Revert "[libc] Add link.h and elf.h headers" (#97931)

Reverts #97924

Author: SchrodingerZhu

libc/config/linux/aarch64/headers.txt

@@ -2,15 +2,13 @@ set(TARGET_PUBLIC_HEADERS
     libc.include.assert
     libc.include.ctype
     libc.include.dlfcn
-    libc.include.elf
     libc.include.errno
     libc.include.features
     libc.include.fenv
     libc.include.float
     libc.include.stdint
     libc.include.inttypes
     libc.include.limits
-    libc.include.link
     libc.include.math
     libc.include.pthread
     libc.include.signal

libc/config/linux/x86_64/headers.txt

@@ -3,7 +3,6 @@ set(TARGET_PUBLIC_HEADERS
     libc.include.ctype
     libc.include.dirent
     libc.include.dlfcn
-    libc.include.elf
     libc.include.errno
     libc.include.fcntl
     libc.include.features
@@ -12,7 +11,6 @@ set(TARGET_PUBLIC_HEADERS
     libc.include.stdint
     libc.include.inttypes
     libc.include.limits
-    libc.include.link
     libc.include.math
     libc.include.pthread
     libc.include.sched

libc/include/CMakeLists.txt

@@ -56,7 +56,6 @@ add_gen_header(
   DEF_FILE dlfcn.h.def
   GEN_HDR dlfcn.h
   DEPENDS
-    .llvm-libc-types.Dl_info
     .llvm-libc-macros.dlfcn_macros
     .llvm_libc_common_h
 )
@@ -368,25 +367,6 @@ add_gen_header(
     .llvm-libc-types.posix_spawn_file_actions_t
 )
 
-add_gen_header(
-  link
-  DEF_FILE link.h.def
-  GEN_HDR link.h
-  DEPENDS
-    .llvm_libc_common_h
-    .llvm-libc-types.struct_dl_phdr_info
-    .llvm-libc-types.__dl_iterate_phdr_callback_t
-    .llvm-libc-macros.link_macros
-)
-
-add_gen_header(
-  elf
-  DEF_FILE elf.h.def
-  GEN_HDR elf.h
-  DEPENDS
-    .llvm-libc-macros.elf_macros
-)
-
 # TODO: Not all platforms will have a include/sys directory. Add the sys
 # directory and the targets for sys/*.h files conditional to the OS requiring
 # them.

libc/include/llvm-libc-macros/CMakeLists.txt

@@ -283,9 +283,3 @@ add_macro_header(
   HDR
     dlfcn-macros.h
 )
-
-add_macro_header(
-  elf_macros
-  HDR
-    elf-macros.h
-)

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

@@ -6,30 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_LIBC_MACROS_LINK_MACROS_H
-#define LLVM_LIBC_MACROS_LINK_MACROS_H
-
-#include "elf-macros.h"
-
 #ifdef __LP64__
-#define ElfW(type) Elf64_##type
+#define ElfW(type) Elf64_ ## type
 #else
-#define ElfW(type) Elf32_##type
-#endif
-
-struct link_map {
-  ElfW(Addr) l_addr;
-  char *l_name;
-  ElfW(Dyn) * l_ld;
-  struct link_map *l_next, *l_prev;
-};
-
-struct r_debug {
-  int r_version;
-  struct link_map *r_map;
-  ElfW(Addr) r_brk;
-  enum { RT_CONSISTENT, RT_ADD, RT_DELETE } r_state;
-  ElfW(Addr) r_ldbase;
-};
-
+#define ElfW(type) Elf32_ ## type
 #endif

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

@@ -89,22 +89,6 @@ add_header(thrd_t HDR thrd_t.h DEPENDS .__thread_type)
 add_header(tss_t HDR tss_t.h)
 add_header(tss_dtor_t HDR tss_dtor_t.h)
 add_header(__atexithandler_t HDR __atexithandler_t.h)
-add_header(Dl_info HDR Dl_info.h)
-add_header(
-  __dl_iterate_phdr_callback_t 
-  HDR __dl_iterate_phdr_callback_t.h
-  DEPENDS
-    .size_t
-)
-add_header(
-  struct_dl_phdr_info 
-  HDR struct_dl_phdr_info.h
-  DEPENDS
-    .__dl_iterate_phdr_callback_t
-    .size_t
-    libc.include.llvm-libc-macros.link_macros
-)
-
 add_header(speed_t HDR speed_t.h)
 add_header(tcflag_t HDR tcflag_t.h)
 add_header(struct_termios HDR struct_termios.h DEPENDS .cc_t .speed_t .tcflag_t)