Genex: Add a SHELL_PATH expression

Some commands on Windows do not understand forward slash paths and
require backslashes.  In order to help projects generate shell
invocations of such commands, provide a generator expression to convert
paths to the shell-preferred path format for the current generator.
This will allow custom commands to generate paths the same way CMake
does for compiler command invocations.

1 files changed, 17 insertions, 0 deletions

diff --git a/Tests/RunCMake/GeneratorExpression/BadSHELL_PATH-stderr.txt b/Tests/RunCMake/GeneratorExpression/BadSHELL_PATH-stderr.txt
new file mode 100644
index 0000000..8d3c4cc
--- /dev/null
+++ b/Tests/RunCMake/GeneratorExpression/BadSHELL_PATH-stderr.txt
@@ -0,0 +1,17 @@
+CMake Error at BadSHELL_PATH.cmake:[0-9]+ \(add_custom_target\):
+  Error evaluating generator expression:
+
+    \$<SHELL_PATH:>
+
+  "" is not an absolute path.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)
++
+CMake Error at BadSHELL_PATH.cmake:[0-9]+ \(add_custom_target\):
+  Error evaluating generator expression:
+
+    \$<SHELL_PATH:Relative/Path>
+
+  "Relative/Path" is not an absolute path.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)