Fixes to GetPrerequisites for cygwin

Fix IF(WIN32) guards check for cygwin. Fix checking if the depenency is in a system location to use cygwin style paths on cygwin. Also change GetPrerequisites to switch gp_tool to tools that are very unlikely to be found, ie. dumpbin on Apple and otool on Windows/Unix.

2 files changed, 32 insertions, 12 deletions

diff --git a/Modules/GetPrerequisites.cmake b/Modules/GetPrerequisites.cmake
index c877308..853b1a1 100644
--- a/Modules/GetPrerequisites.cmake
+++ b/Modules/GetPrerequisites.cmake
@@ -146,7 +146,7 @@ function(is_file_executable file result_var)
 
   # If file name ends in .exe on Windows, *assume* executable:
   #
-  if(WIN32)
+  if(WIN32 AND NOT UNIX)
     if("${file_full_lower}" MATCHES "\\.exe$")
       set(${result_var} 1 PARENT_SCOPE)
       return()
@@ -156,7 +156,7 @@ function(is_file_executable file result_var)
     # to determine ${result_var}. In 99%+? practical cases, the exe name
     # match will be sufficient...
     #
-  endif(WIN32)
+  endif(WIN32 AND NOT UNIX)
 
   # Use the information returned from the Unix shell command "file" to
   # determine if ${file_full} should be considered an executable file...
@@ -335,7 +335,7 @@ function(gp_resolve_item context item exepath dirs resolved_item_var)
   # Using find_program on Windows will find dll files that are in the PATH.
   # (Converting simple file names into full path names if found.)
   #
-  if(WIN32)
+  if(WIN32 AND NOT UNIX)
   if(NOT resolved)
     set(ri "ri-NOTFOUND")
     find_program(ri "${item}" PATHS "${exepath};${dirs}" NO_DEFAULT_PATH)
@@ -347,7 +347,7 @@ function(gp_resolve_item context item exepath dirs resolved_item_var)
       set(ri "ri-NOTFOUND")
     endif(ri)
   endif(NOT resolved)
-  endif(WIN32)
+  endif(WIN32 AND NOT UNIX)
 
   # Provide a hook so that projects can override item resolution
   # by whatever logic they choose:
@@ -413,7 +413,7 @@ function(gp_resolved_file_type original_file file exepath dirs type_var)
     string(TOLOWER "${resolved_file}" lower)
 
     if(UNIX)
-      if(resolved_file MATCHES "^(/lib/|/lib32/|/lib64/|/usr/lib/|/usr/lib32/|/usr/lib64/|/usr/X11R6/)")
+      if(resolved_file MATCHES "^(/lib/|/lib32/|/lib64/|/usr/lib/|/usr/lib32/|/usr/lib64/|/usr/X11R6/|/usr/bin/)")
         set(is_system 1)
       endif()
     endif()
@@ -434,7 +434,27 @@ function(gp_resolved_file_type original_file file exepath dirs type_var)
       if(lower MATCHES "^(${sysroot}/sys(tem|wow)|${windir}/sys(tem|wow)|(.*/)*msvc[^/]+dll)")
         set(is_system 1)
       endif()
-    endif()
+
+      if(UNIX)
+        # if cygwin, we can get the properly formed windows paths from cygpath
+        find_program(CYGPATH_EXECUTABLE cygpath)
+
+        if(CYGPATH_EXECUTABLE)
+          execute_process(COMMAND ${CYGPATH_EXECUTABLE} -W
+                          OUTPUT_VARIABLE env_windir
+                          OUTPUT_STRIP_TRAILING_WHITESPACE)
+          execute_process(COMMAND ${CYGPATH_EXECUTABLE} -S
+                          OUTPUT_VARIABLE env_sysdir
+                          OUTPUT_STRIP_TRAILING_WHITESPACE)
+          string(TOLOWER "${env_windir}" windir)
+          string(TOLOWER "${env_sysdir}" sysroot)
+
+          if(lower MATCHES "^(${sysroot}/sys(tem|wow)|${windir}/sys(tem|wow)|(.*/)*msvc[^/]+dll)")
+            set(is_system 1)
+          endif()
+        endif(CYGPATH_EXECUTABLE)
+      endif(UNIX)
+    endif(WIN32)
 
     if(NOT is_system)
       get_filename_component(original_path "${original_lower}" PATH)
@@ -519,9 +539,9 @@ function(get_prerequisites target prerequisites_var exclude_system recurse exepa
     if(APPLE)
       set(gp_tool "otool")
     endif(APPLE)
-    if(WIN32)
+    if(WIN32 AND NOT UNIX) # This is how to check for cygwin, har!
       set(gp_tool "dumpbin")
-    endif(WIN32)
+    endif(WIN32 AND NOT UNIX)
   endif("${gp_tool}" STREQUAL "")
 
   set(gp_tool_known 0)
diff --git a/Tests/CMakeTests/GetPrerequisitesTest.cmake.in b/Tests/CMakeTests/GetPrerequisitesTest.cmake.in
index 182c223..daf467b 100644
--- a/Tests/CMakeTests/GetPrerequisitesTest.cmake.in
+++ b/Tests/CMakeTests/GetPrerequisitesTest.cmake.in
@@ -121,11 +121,11 @@ message(STATUS "")
 message(STATUS "=============================================================================")
 message(STATUS "Test overriding 'gp_tool' with value unlikely to be found")
 message(STATUS "")
-if(WIN32 OR APPLE)
-  set(gp_tool "ldd")
-else(WIN32 OR APPLE)
+if(APPLE)
+  set(gp_tool "dumpbin")
+else()
   set(gp_tool "otool")
-endif(WIN32 OR APPLE)
+endif()
 set(gp_cmd "gp_cmd-NOTFOUND")
 list_prerequisites("${CMAKE_COMMAND}" 0 0 0)
 set(gp_cmd)