Add support for WINDOWS_EXPORT_ALL_SYMBOLS when cross-compiling to Windows

Implement `__create_def` using `llvm-nm` (when given as `CMAKE_NM`).

Source/CMakeLists.txt

@@ -693,6 +693,8 @@ set(SRCS
 
   cmDuration.h
   cmDuration.cxx
+
+  bindexplib.cxx
   )
 
 SET_PROPERTY(SOURCE cmProcessOutput.cxx APPEND PROPERTY COMPILE_DEFINITIONS
@@ -715,7 +717,6 @@ if (WIN32)
   set(SRCS ${SRCS}
     cmCallVisualStudioMacro.cxx
     cmCallVisualStudioMacro.h
-    bindexplib.cxx
     )
 
   if(NOT UNIX)

Source/bindexplib.cxx

@@ -64,32 +64,36 @@
  */
 #include "bindexplib.h"
 
-#include <iostream>
+#include <cstddef>
 #include <sstream>
 #include <vector>
 
-#include <windows.h>
+#ifdef _WIN32
+#  include <windows.h>
+
+#  include "cmsys/Encoding.hxx"
+#endif
 
-#include "cmsys/Encoding.hxx"
 #include "cmsys/FStream.hxx"
 
 #include "cmSystemTools.h"
 
-#ifndef IMAGE_FILE_MACHINE_ARM
+#ifdef _WIN32
-#  define IMAGE_FILE_MACHINE_ARM 0x01c0 // ARM Little-Endian
+#  ifndef IMAGE_FILE_MACHINE_ARM
-#endif
+#    define IMAGE_FILE_MACHINE_ARM 0x01c0 // ARM Little-Endian
+#  endif
 
-#ifndef IMAGE_FILE_MACHINE_THUMB
+#  ifndef IMAGE_FILE_MACHINE_THUMB
-#  define IMAGE_FILE_MACHINE_THUMB 0x01c2 // ARM Thumb/Thumb-2 Little-Endian
+#    define IMAGE_FILE_MACHINE_THUMB 0x01c2 // ARM Thumb/Thumb-2 Little-Endian
-#endif
+#  endif
 
-#ifndef IMAGE_FILE_MACHINE_ARMNT
+#  ifndef IMAGE_FILE_MACHINE_ARMNT
-#  define IMAGE_FILE_MACHINE_ARMNT 0x01c4 // ARM Thumb-2 Little-Endian
+#    define IMAGE_FILE_MACHINE_ARMNT 0x01c4 // ARM Thumb-2 Little-Endian
-#endif
+#  endif
 
-#ifndef IMAGE_FILE_MACHINE_ARM64
+#  ifndef IMAGE_FILE_MACHINE_ARM64
-#  define IMAGE_FILE_MACHINE_ARM64 0xaa64 // ARM64 Little-Endian
+#    define IMAGE_FILE_MACHINE_ARM64 0xaa64 // ARM64 Little-Endian
-#endif
+#  endif
 
 typedef struct cmANON_OBJECT_HEADER_BIGOBJ
 {
@@ -306,6 +310,7 @@ private:
   SymbolTableType* SymbolTable;
   bool IsI386;
 };
+#endif
 
 bool DumpFileWithLlvmNm(std::string const& nmPath, const char* filename,
                         std::set<std::string>& symbols,
@@ -315,15 +320,15 @@ bool DumpFileWithLlvmNm(std::string const& nmPath, const char* filename,
   // break up command line into a vector
   std::vector<std::string> command;
   command.push_back(nmPath);
-  command.push_back("--no-weak");
+  command.emplace_back("--no-weak");
-  command.push_back("--defined-only");
+  command.emplace_back("--defined-only");
-  command.push_back("--format=posix");
+  command.emplace_back("--format=posix");
-  command.push_back(filename);
+  command.emplace_back(filename);
 
   // run the command
   int exit_code = 0;
-  cmSystemTools::RunSingleCommand(command, &output, &output, &exit_code, "",
+  cmSystemTools::RunSingleCommand(command, &output, &output, &exit_code,
-                                  cmSystemTools::OUTPUT_NONE);
+                                  nullptr, cmSystemTools::OUTPUT_NONE);
 
   if (exit_code != 0) {
     fprintf(stderr, "llvm-nm returned an error: %s\n", output.c_str());
@@ -336,7 +341,7 @@ bool DumpFileWithLlvmNm(std::string const& nmPath, const char* filename,
     if (line.empty()) { // last line
       continue;
     }
-    size_t sym_end = line.find(" ");
+    size_t sym_end = line.find(' ');
     if (sym_end == std::string::npos) {
       fprintf(stderr, "Couldn't parse llvm-nm output line: %s\n",
               line.c_str());
@@ -366,6 +371,9 @@ bool DumpFile(std::string const& nmPath, const char* filename,
               std::set<std::string>& symbols,
               std::set<std::string>& dataSymbols)
 {
+#ifndef _WIN32
+  return DumpFileWithLlvmNm(nmPath, filename, symbols, dataSymbols);
+#else
   HANDLE hFile;
   HANDLE hFileMapping;
   LPVOID lpFileBase;
@@ -446,6 +454,7 @@ bool DumpFile(std::string const& nmPath, const char* filename,
   CloseHandle(hFileMapping);
   CloseHandle(hFile);
   return true;
+#endif
 }
 
 bool bindexplib::AddObjectFile(const char* filename)

Source/cmGeneratorTarget.cxx

@@ -2508,11 +2508,11 @@ void cmGeneratorTarget::ComputeModuleDefinitionInfo(
   info.WindowsExportAllSymbols =
     this->Makefile->IsOn("CMAKE_SUPPORT_WINDOWS_EXPORT_ALL_SYMBOLS") &&
     this->GetPropertyAsBool("WINDOWS_EXPORT_ALL_SYMBOLS");
-#if defined(_WIN32) && !defined(CMAKE_BOOTSTRAP)
+#if !defined(CMAKE_BOOTSTRAP)
   info.DefFileGenerated =
     info.WindowsExportAllSymbols || info.Sources.size() > 1;
 #else
-  // Our __create_def helper is only available on Windows.
+  // Our __create_def helper is not available during CMake bootstrap.
   info.DefFileGenerated = false;
 #endif
   if (info.DefFileGenerated) {

Source/cmcmd.cxx

@@ -21,16 +21,15 @@
 
 #if !defined(CMAKE_BOOTSTRAP)
 #  include "cmDependsFortran.h" // For -E cmake_copy_f90_mod callback.
+#  include "cmFileTime.h"
 #  include "cmServer.h"
 #  include "cmServerConnection.h"
+
+#  include "bindexplib.h"
 #endif
 
 #if !defined(CMAKE_BOOTSTRAP) && defined(_WIN32)
 #  include "cmsys/ConsoleBuf.hxx"
-
-#  include "cmFileTime.h"
-
-#  include "bindexplib.h"
 #endif
 
 #if !defined(CMAKE_BOOTSTRAP) && defined(_WIN32) && !defined(__CYGWIN__)
@@ -581,11 +580,11 @@ int cmcmd::ExecuteCMakeCommand(std::vector<std::string> const& args)
       return 0;
     }
 
-#if defined(_WIN32) && !defined(CMAKE_BOOTSTRAP)
+#if !defined(CMAKE_BOOTSTRAP)
-    else if (args[1] == "__create_def") {
+    if (args[1] == "__create_def") {
       if (args.size() < 4) {
         std::cerr << "__create_def Usage: -E __create_def outfile.def "
-                     "objlistfile [-nm=nm-path]\n";
+                     "objlistfile [--nm=nm-path]\n";
         return 1;
       }
       cmsys::ifstream fin(args[3].c_str(), std::ios::in | std::ios::binary);
@@ -612,7 +611,7 @@ int cmcmd::ExecuteCMakeCommand(std::vector<std::string> const& args)
           return 0;
         }
       }
-      FILE* fout = cmsys::SystemTools::Fopen(args[2].c_str(), "w+");
+      FILE* fout = cmsys::SystemTools::Fopen(args[2], "w+");
       if (!fout) {
         std::cerr << "could not open output .def file: " << args[2].c_str()
                   << "\n";