Merge topic 'cygwin-patches'

ecc1961768 FindTclsh: Drop Cygwin-specific behavior and use POSIX code path
af666acdf4 FindOpenGL: Drop Cygwin-specific behavior and use POSIX code path
8edbc59e46 install: Use case-sensitive pattern matching on Cygwin
24482499ea FindPerlLibs: Add versioned perl library name for Cygwin

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !5092

Modules/FindOpenGL.cmake

@@ -132,19 +132,7 @@ endforeach()
 
 set(_OpenGL_CACHE_VARS)
 
-if (CYGWIN)
-  find_path(OPENGL_INCLUDE_DIR GL/gl.h )
-  list(APPEND _OpenGL_REQUIRED_VARS OPENGL_INCLUDE_DIR)
-
-  find_library(OPENGL_gl_LIBRARY opengl32 )
-  find_library(OPENGL_glu_LIBRARY glu32 )
-
-  list(APPEND _OpenGL_CACHE_VARS
-    OPENGL_INCLUDE_DIR
-    OPENGL_gl_LIBRARY
-    OPENGL_glu_LIBRARY
-    )
-elseif (WIN32)
+if (WIN32)
 
   if(BORLAND)
     set (OPENGL_gl_LIBRARY import32 CACHE STRING "OpenGL library for win32")

Modules/FindPerlLibs.cmake

@@ -108,6 +108,9 @@ if (PERL_EXECUTABLE)
   if (NOT PERL_POSSIBLE_LIBRARY_NAMES)
     set(PERL_POSSIBLE_LIBRARY_NAMES perl${PERL_VERSION_STRING} perl)
   endif()
+  if(CMAKE_SYSTEM_NAME MATCHES "CYGWIN")
+    list (APPEND PERL_POSSIBLE_LIBRARY_NAMES perl${PERL_VERSION_STRING})
+  endif()
   if (CMAKE_SYSTEM_NAME MATCHES "MSYS|CYGWIN")
     # on MSYS and CYGWIN environments, current perl -V:libperl gives shared library name
     # rather than the import library. So, extends possible library names

Modules/FindTclsh.cmake

@@ -15,15 +15,8 @@ library is.  This code sets the following variables:
 
   TCLSH_FOUND = TRUE if tclsh has been found
   TCL_TCLSH = the path to the tclsh executable
-
-In cygwin, look for the cygwin version first.  Don't look for it later
-to avoid finding the cygwin version on a Win32 build.
 #]=======================================================================]
 
-if(CYGWIN)
-  find_program(TCL_TCLSH NAMES cygtclsh83 cygtclsh80)
-endif()
-
 get_filename_component(TK_WISH_PATH "${TK_WISH}" PATH)
 get_filename_component(TK_WISH_PATH_PARENT "${TK_WISH_PATH}" PATH)
 string(REGEX REPLACE

Source/cmInstallCommand.cxx

@@ -1157,7 +1157,7 @@ bool HandleDirectoryMode(std::vector<std::string> const& args,
     } else if (doing == DoingRegex) {
       literal_args += " REGEX \"";
 // Match rules are case-insensitive on some platforms.
-#if defined(_WIN32) || defined(__APPLE__) || defined(__CYGWIN__)
+#if defined(_WIN32) || defined(__APPLE__)
       std::string regex = cmSystemTools::LowerCase(args[i]);
 #else
       std::string regex = args[i];