Add option to control 'bin' directory of CMake's own installation (#16076)

Add a `CMAKE_BIN_DIR` cache entry to CMake's own build configuration.
Add a `--bindir` option to the `bootstrap` script to set it.

5 files changed, 22 insertions, 9 deletions

diff --git a/Source/CMakeInstallDestinations.cmake b/Source/CMakeInstallDestinations.cmake
index 2f9d95a..023f6c0 100644
--- a/Source/CMakeInstallDestinations.cmake
+++ b/Source/CMakeInstallDestinations.cmake
@@ -1,27 +1,32 @@
 # Keep formatting here consistent with bootstrap script expectations.
 if(BEOS)
+  set(CMAKE_BIN_DIR_DEFAULT "bin") # HAIKU
   set(CMAKE_DATA_DIR_DEFAULT "share/cmake-${CMake_VERSION_MAJOR}.${CMake_VERSION_MINOR}") # HAIKU
   set(CMAKE_MAN_DIR_DEFAULT "documentation/man") # HAIKU
   set(CMAKE_DOC_DIR_DEFAULT "documentation/doc/cmake-${CMake_VERSION_MAJOR}.${CMake_VERSION_MINOR}") # HAIKU
   set(CMAKE_XDGDATA_DIR_DEFAULT "share") # HAIKU
 elseif(CYGWIN)
+  set(CMAKE_BIN_DIR_DEFAULT "bin") # CYGWIN
   set(CMAKE_DATA_DIR_DEFAULT "share/cmake-${CMake_VERSION}") # CYGWIN
   set(CMAKE_DOC_DIR_DEFAULT "share/doc/cmake-${CMake_VERSION}") # CYGWIN
   set(CMAKE_MAN_DIR_DEFAULT "share/man") # CYGWIN
   set(CMAKE_XDGDATA_DIR_DEFAULT "share") # CYGWIN
 else()
+  set(CMAKE_BIN_DIR_DEFAULT "bin") # OTHER
   set(CMAKE_DATA_DIR_DEFAULT "share/cmake-${CMake_VERSION_MAJOR}.${CMake_VERSION_MINOR}") # OTHER
   set(CMAKE_DOC_DIR_DEFAULT "doc/cmake-${CMake_VERSION_MAJOR}.${CMake_VERSION_MINOR}") # OTHER
   set(CMAKE_MAN_DIR_DEFAULT "man") # OTHER
   set(CMAKE_XDGDATA_DIR_DEFAULT "share") # OTHER
 endif()
 
+set(CMAKE_BIN_DIR_DESC "bin")
 set(CMAKE_DATA_DIR_DESC "data")
 set(CMAKE_DOC_DIR_DESC "docs")
 set(CMAKE_MAN_DIR_DESC "man pages")
 set(CMAKE_XDGDATA_DIR_DESC "XDG specific files")
 
 foreach(v
+    CMAKE_BIN_DIR
     CMAKE_DATA_DIR
     CMAKE_DOC_DIR
     CMAKE_MAN_DIR
diff --git a/Source/CMakeLists.txt b/Source/CMakeLists.txt
index 3223831..3f00c8e 100644
--- a/Source/CMakeLists.txt
+++ b/Source/CMakeLists.txt
@@ -786,7 +786,7 @@ endif()
 
 foreach(_tool ${_tools})
   CMake_OPTIONAL_COMPONENT(${_tool})
-  install(TARGETS ${_tool} DESTINATION bin ${COMPONENT})
+  install(TARGETS ${_tool} DESTINATION ${CMAKE_BIN_DIR} ${COMPONENT})
 endforeach()
 
 install(FILES cmCPluginAPI.h DESTINATION ${CMAKE_DATA_DIR}/include)
diff --git a/Source/CursesDialog/CMakeLists.txt b/Source/CursesDialog/CMakeLists.txt
index 93ff425..55599b6 100644
--- a/Source/CursesDialog/CMakeLists.txt
+++ b/Source/CursesDialog/CMakeLists.txt
@@ -48,4 +48,4 @@ else()
 endif()
 
 CMake_OPTIONAL_COMPONENT(ccmake)
-install(TARGETS ccmake DESTINATION bin ${COMPONENT})
+install(TARGETS ccmake DESTINATION ${CMAKE_BIN_DIR} ${COMPONENT})
diff --git a/Source/cmConfigure.cmake.h.in b/Source/cmConfigure.cmake.h.in
index 62128a7..11ff00b 100644
--- a/Source/cmConfigure.cmake.h.in
+++ b/Source/cmConfigure.cmake.h.in
@@ -15,4 +15,5 @@
 #cmakedefine CMAKE_USE_MACH_PARSER
 #cmakedefine CMAKE_ENCODING_UTF8
 #cmakedefine CMake_HAVE_CXX11_UNORDERED_MAP
+#define CMAKE_BIN_DIR "/@CMAKE_BIN_DIR@"
 #define CMAKE_DATA_DIR "/@CMAKE_DATA_DIR@"
diff --git a/Source/cmSystemTools.cxx b/Source/cmSystemTools.cxx
index 7dece47..99d8569 100644
--- a/Source/cmSystemTools.cxx
+++ b/Source/cmSystemTools.cxx
@@ -1930,11 +1930,11 @@ void cmSystemTools::FindCMakeResources(const char* argv0)
   }
   if (cmSystemTools::GetFilenameName(exe_dir) == "MacOS") {
     // The executable is inside an application bundle.
-    // Look for ../bin (install tree) and then fall back to
+    // Look for ..<CMAKE_BIN_DIR> (install tree) and then fall back to
     // ../../../bin (build tree).
     exe_dir = cmSystemTools::GetFilenamePath(exe_dir);
-    if (cmSystemTools::FileExists((exe_dir + "/bin/cmake").c_str())) {
-      exe_dir += "/bin";
+    if (cmSystemTools::FileExists(exe_dir + CMAKE_BIN_DIR "/cmake")) {
+      exe_dir += CMAKE_BIN_DIR;
     } else {
       exe_dir = cmSystemTools::GetFilenamePath(exe_dir);
       exe_dir = cmSystemTools::GetFilenamePath(exe_dir);
@@ -1985,13 +1985,20 @@ void cmSystemTools::FindCMakeResources(const char* argv0)
   }
 
 #ifdef CMAKE_BUILD_WITH_CMAKE
-  // Install tree has "<prefix>/bin/cmake" and "<prefix><CMAKE_DATA_DIR>".
-  std::string dir = cmSystemTools::GetFilenamePath(exe_dir);
-  cmSystemToolsCMakeRoot = dir + CMAKE_DATA_DIR;
-  if (!cmSystemTools::FileExists(
+  // Install tree has
+  // - "<prefix><CMAKE_BIN_DIR>/cmake"
+  // - "<prefix><CMAKE_DATA_DIR>"
+  if (cmHasSuffix(exe_dir, CMAKE_BIN_DIR)) {
+    std::string const prefix =
+      exe_dir.substr(0, exe_dir.size() - strlen(CMAKE_BIN_DIR));
+    cmSystemToolsCMakeRoot = prefix + CMAKE_DATA_DIR;
+  }
+  if (cmSystemToolsCMakeRoot.empty() ||
+      !cmSystemTools::FileExists(
         (cmSystemToolsCMakeRoot + "/Modules/CMake.cmake").c_str())) {
     // Build tree has "<build>/bin[/<config>]/cmake" and
     // "<build>/CMakeFiles/CMakeSourceDir.txt".
+    std::string dir = cmSystemTools::GetFilenamePath(exe_dir);
     std::string src_dir_txt = dir + "/CMakeFiles/CMakeSourceDir.txt";
     cmsys::ifstream fin(src_dir_txt.c_str());
     std::string src_dir;