[CMake] Remove HAVE_DLFCN_H and HAVE_DLADDR (#123879)

It is sufficient to just use `HAVE_DLOPEN`.

Author: MaskRay

llvm/cmake/config-ix.cmake

@@ -18,23 +18,20 @@ include(CheckProblematicConfigurations)
 include(HandleLLVMStdlib)
 
 if (ANDROID OR CYGWIN OR CMAKE_SYSTEM_NAME MATCHES "AIX|DragonFly|FreeBSD|Haiku|Linux|NetBSD|OpenBSD|SunOS")
-  set(HAVE_DLFCN_H 1)
   set(HAVE_MACH_MACH_H 0)
   set(HAVE_MALLOC_MALLOC_H 0)
   set(HAVE_PTHREAD_H 1)
   set(HAVE_SYS_MMAN_H 1)
   set(HAVE_SYSEXITS_H 1)
   set(HAVE_UNISTD_H 1)
 elseif (APPLE)
-  set(HAVE_DLFCN_H 1)
   set(HAVE_MACH_MACH_H 1)
   set(HAVE_MALLOC_MALLOC_H 1)
   set(HAVE_PTHREAD_H 1)
   set(HAVE_SYS_MMAN_H 1)
   set(HAVE_SYSEXITS_H 1)
   set(HAVE_UNISTD_H 1)
 elseif (PURE_WINDOWS)
-  set(HAVE_DLFCN_H 0)
   set(HAVE_MACH_MACH_H 0)
   set(HAVE_MALLOC_MALLOC_H 0)
   set(HAVE_PTHREAD_H 0)
@@ -44,7 +41,6 @@ elseif (PURE_WINDOWS)
 elseif (ZOS)
   # Confirmed in
   # https://github.com/llvm/llvm-project/pull/104706#issuecomment-2297109613
-  set(HAVE_DLFCN_H 1)
   set(HAVE_MACH_MACH_H 0)
   set(HAVE_MALLOC_MALLOC_H 0)
   set(HAVE_PTHREAD_H 1)
@@ -53,7 +49,6 @@ elseif (ZOS)
   set(HAVE_UNISTD_H 1)
 else()
   # Other platforms that we don't promise support for.
-  check_include_file(dlfcn.h HAVE_DLFCN_H)
   check_include_file(mach/mach.h HAVE_MACH_MACH_H)
   check_include_file(malloc/malloc.h HAVE_MALLOC_MALLOC_H)
   check_include_file(pthread.h HAVE_PTHREAD_H)
@@ -390,15 +385,11 @@ if (NOT PURE_WINDOWS)
   if (LLVM_PTHREAD_LIB)
     list(REMOVE_ITEM CMAKE_REQUIRED_LIBRARIES ${LLVM_PTHREAD_LIB})
   endif()
-endif()
 
-# This check requires _GNU_SOURCE.
-if( HAVE_DLFCN_H )
   if( HAVE_LIBDL )
     list(APPEND CMAKE_REQUIRED_LIBRARIES dl)
   endif()
   check_symbol_exists(dlopen dlfcn.h HAVE_DLOPEN)
-  check_symbol_exists(dladdr dlfcn.h HAVE_DLADDR)
   if( HAVE_LIBDL )
     list(REMOVE_ITEM CMAKE_REQUIRED_LIBRARIES dl)
   endif()

llvm/include/llvm/Config/config.h.cmake

@@ -54,15 +54,9 @@
    don't. */
 #cmakedefine01 HAVE_DECL_STRERROR_S
 
-/* Define to 1 if you have the <dlfcn.h> header file. */
-#cmakedefine HAVE_DLFCN_H ${HAVE_DLFCN_H}
-
 /* Define if dlopen() is available on this platform. */
 #cmakedefine HAVE_DLOPEN ${HAVE_DLOPEN}
 
-/* Define if dladdr() is available on this platform. */
-#cmakedefine HAVE_DLADDR ${HAVE_DLADDR}
-
 /* Define to 1 if we can register EH frames on this platform. */
 #cmakedefine HAVE_REGISTER_FRAME ${HAVE_REGISTER_FRAME}
 

llvm/lib/Support/Unix/DynamicLibrary.inc

@@ -10,7 +10,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-#if defined(HAVE_DLFCN_H) && defined(HAVE_DLOPEN)
+#if defined(HAVE_DLOPEN)
 #include <dlfcn.h>
 
 DynamicLibrary::HandleSet::~HandleSet() {

llvm/lib/Support/Unix/Path.inc

@@ -318,7 +318,7 @@ std::string getMainExecutable(const char *argv0, void *MainAddr) {
       return std::string(real_path);
     break; // Found entry, but realpath failed.
   }
-#elif defined(HAVE_DLFCN_H) && defined(HAVE_DLADDR)
+#elif defined(HAVE_DLOPEN)
   // Use dladdr to get executable path if available.
   Dl_info DLInfo;
   int err = dladdr(MainAddr, &DLInfo);

llvm/lib/Support/Unix/Signals.inc

@@ -52,9 +52,7 @@
 #endif
 #include <signal.h>
 #include <sys/stat.h>
-#if HAVE_DLFCN_H
 #include <dlfcn.h>
-#endif
 #if HAVE_MACH_MACH_H
 #include <mach/mach.h>
 #endif
@@ -814,7 +812,7 @@ void llvm::sys::PrintStackTrace(raw_ostream &OS, int Depth) {
   OS << "Stack dump without symbol names (ensure you have llvm-symbolizer in "
         "your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point "
         "to it):\n";
-#if HAVE_DLFCN_H && HAVE_DLADDR
+#if HAVE_DLOPEN
   int width = 0;
   for (int i = 0; i < depth; ++i) {
     Dl_info dlinfo;

llvm/lib/Support/Unix/Unix.h

@@ -39,9 +39,7 @@
 #include <sys/time.h>
 #include <time.h>
 
-#ifdef HAVE_DLFCN_H
-# include <dlfcn.h>
-#endif
+#include <dlfcn.h>
 
 # include <fcntl.h>
 

llvm/unittests/Support/DynamicLibrary/DynamicLibraryTest.cpp

@@ -32,7 +32,7 @@ std::string LibPath(const std::string Name = "PipSqueak") {
   return std::string(Buf.str());
 }
 
-#if defined(_WIN32) || (defined(HAVE_DLFCN_H) && defined(HAVE_DLOPEN))
+#if defined(_WIN32) || defined(HAVE_DLOPEN)
 
 typedef void (*SetStrings)(std::string &GStr, std::string &LStr);
 typedef void (*TestOrder)(std::vector<std::string> &V);

llvm/utils/gn/secondary/llvm/include/llvm/Config/BUILD.gn

@@ -201,8 +201,6 @@ write_cmake_config("config") {
   if (current_os == "win") {
     values += [
       "HAVE_DECL_STRERROR_S=1",
-      "HAVE_DLADDR=",
-      "HAVE_DLFCN_H=",
       "HAVE_DLOPEN=",
       "HAVE_FUTIMES=",
       "HAVE_GETPAGESIZE=",
@@ -230,8 +228,6 @@ write_cmake_config("config") {
     # POSIX-y system defaults.
     values += [
       "HAVE_DECL_STRERROR_S=",
-      "HAVE_DLADDR=1",
-      "HAVE_DLFCN_H=1",
       "HAVE_DLOPEN=1",
       "HAVE_FUTIMES=1",
       "HAVE_GETPAGESIZE=1",

utils/bazel/llvm-project-overlay/llvm/include/llvm/Config/config.h

@@ -66,15 +66,9 @@
    don't. */
 #define HAVE_DECL_STRERROR_S 0
 
-/* Define to 1 if you have the <dlfcn.h> header file. */
-#define HAVE_DLFCN_H 1
-
 /* Define if dlopen() is available on this platform. */
 #define HAVE_DLOPEN 1
 
-/* Define if dladdr() is available on this platform. */
-#define HAVE_DLADDR 1
-
 /* Define to 1 if we can register EH frames on this platform. */
 /* HAVE_REGISTER_FRAME defined in Bazel*/
 

utils/bazel/llvm_configs/config.h.cmake

@@ -54,15 +54,9 @@
    don't. */
 #cmakedefine01 HAVE_DECL_STRERROR_S
 
-/* Define to 1 if you have the <dlfcn.h> header file. */
-#cmakedefine HAVE_DLFCN_H ${HAVE_DLFCN_H}
-
 /* Define if dlopen() is available on this platform. */
 #cmakedefine HAVE_DLOPEN ${HAVE_DLOPEN}
 
-/* Define if dladdr() is available on this platform. */
-#cmakedefine HAVE_DLADDR ${HAVE_DLADDR}
-
 /* Define to 1 if we can register EH frames on this platform. */
 #cmakedefine HAVE_REGISTER_FRAME ${HAVE_REGISTER_FRAME}