file: Add GENERATE command to produce files at generate time

The idea is to write to a temp file which contains generator
expressions, and at generate time, evaluate the generator expressions,
and write the result to a file.

Because executables on Windows are limited in the length of command line
it is possible to use, it is common to write command line arguments to a
file instead and specify the file as a source of arguments.

This new FILE(GENERATE) subcommand allows the use of generator
expressions to create such files so that they can be used with
add_custom_command for example.

20 files changed, 71 insertions, 0 deletions

diff --git a/Tests/RunCMake/CMakeLists.txt b/Tests/RunCMake/CMakeLists.txt
index 402c8a9..53bb8d8 100644
--- a/Tests/RunCMake/CMakeLists.txt
+++ b/Tests/RunCMake/CMakeLists.txt
@@ -86,3 +86,5 @@ if("${CMAKE_TEST_GENERATOR}" MATCHES "Visual Studio [^6]")
   add_RunCMake_test(include_external_msproject)
   add_RunCMake_test(SolutionGlobalSections)
 endif()
+
+add_RunCMake_test(File_Generate)
diff --git a/Tests/RunCMake/File_Generate/BadCondition-result.txt b/Tests/RunCMake/File_Generate/BadCondition-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/File_Generate/BadCondition-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/File_Generate/BadCondition-stderr.txt b/Tests/RunCMake/File_Generate/BadCondition-stderr.txt
new file mode 100644
index 0000000..bab8368
--- /dev/null
+++ b/Tests/RunCMake/File_Generate/BadCondition-stderr.txt
@@ -0,0 +1,3 @@
+CMake Error in CMakeLists.txt:
+  Evaluation file condition \"\$<1:Bad>\" did not evaluate to valid content.
+  Got \"Bad\".
diff --git a/Tests/RunCMake/File_Generate/BadCondition.cmake b/Tests/RunCMake/File_Generate/BadCondition.cmake
new file mode 100644
index 0000000..82ad672
--- /dev/null
+++ b/Tests/RunCMake/File_Generate/BadCondition.cmake
@@ -0,0 +1,5 @@
+
+file(GENERATE OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/output.txt"
+              INPUT "${CMAKE_CURRENT_SOURCE_DIR}/input.txt"
+              CONDITION $<1:Bad>
+)
diff --git a/Tests/RunCMake/File_Generate/CMakeLists.txt b/Tests/RunCMake/File_Generate/CMakeLists.txt
new file mode 100644
index 0000000..e8db6b0
--- /dev/null
+++ b/Tests/RunCMake/File_Generate/CMakeLists.txt
@@ -0,0 +1,3 @@
+cmake_minimum_required(VERSION 2.8)
+project(${RunCMake_TEST} NONE)
+include(${RunCMake_TEST}.cmake)
diff --git a/Tests/RunCMake/File_Generate/CommandConflict-result.txt b/Tests/RunCMake/File_Generate/CommandConflict-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/File_Generate/CommandConflict-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/File_Generate/CommandConflict-stderr.txt b/Tests/RunCMake/File_Generate/CommandConflict-stderr.txt
new file mode 100644
index 0000000..da97ba4
--- /dev/null
+++ b/Tests/RunCMake/File_Generate/CommandConflict-stderr.txt
@@ -0,0 +1 @@
+CMake Error: File to be generated by multiple different commands: .*CommandConflict-build/output_.*.txt
diff --git a/Tests/RunCMake/File_Generate/CommandConflict.cmake b/Tests/RunCMake/File_Generate/CommandConflict.cmake
new file mode 100644
index 0000000..d57bc12
--- /dev/null
+++ b/Tests/RunCMake/File_Generate/CommandConflict.cmake
@@ -0,0 +1,9 @@
+
+file(GENERATE OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/output_$<CONFIGURATION>.txt"
+              INPUT "${CMAKE_CURRENT_SOURCE_DIR}/input.txt"
+              CONDITION $<CONFIG:$<CONFIGURATION>>
+)
+file(GENERATE OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/output_$<CONFIGURATION>.txt"
+              INPUT "${CMAKE_CURRENT_SOURCE_DIR}/input.txt"
+              CONDITION $<CONFIG:$<CONFIGURATION>>
+)
diff --git a/Tests/RunCMake/File_Generate/DebugEvaluate.cmake b/Tests/RunCMake/File_Generate/DebugEvaluate.cmake
new file mode 100644
index 0000000..1fa9b62
--- /dev/null
+++ b/Tests/RunCMake/File_Generate/DebugEvaluate.cmake
@@ -0,0 +1,5 @@
+
+file(GENERATE OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/output.txt"
+              INPUT "${CMAKE_CURRENT_SOURCE_DIR}/input.txt"
+              CONDITION $<CONFIG:Debug>
+)
diff --git a/Tests/RunCMake/File_Generate/EmptyCondition1-result.txt b/Tests/RunCMake/File_Generate/EmptyCondition1-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/File_Generate/EmptyCondition1-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/File_Generate/EmptyCondition1-stderr.txt b/Tests/RunCMake/File_Generate/EmptyCondition1-stderr.txt
new file mode 100644
index 0000000..9fe39cc
--- /dev/null
+++ b/Tests/RunCMake/File_Generate/EmptyCondition1-stderr.txt
@@ -0,0 +1,4 @@
+CMake Error at EmptyCondition1.cmake:2 \(file\):
+  file Incorrect arguments to GENERATE subcommand.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)
diff --git a/Tests/RunCMake/File_Generate/EmptyCondition1.cmake b/Tests/RunCMake/File_Generate/EmptyCondition1.cmake
new file mode 100644
index 0000000..8574a5f
--- /dev/null
+++ b/Tests/RunCMake/File_Generate/EmptyCondition1.cmake
@@ -0,0 +1,5 @@
+
+file(GENERATE OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/output.txt"
+              INPUT "${CMAKE_CURRENT_SOURCE_DIR}/input.txt"
+              CONDITION
+)
diff --git a/Tests/RunCMake/File_Generate/EmptyCondition2-result.txt b/Tests/RunCMake/File_Generate/EmptyCondition2-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/File_Generate/EmptyCondition2-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/File_Generate/EmptyCondition2-stderr.txt b/Tests/RunCMake/File_Generate/EmptyCondition2-stderr.txt
new file mode 100644
index 0000000..73d5f25
--- /dev/null
+++ b/Tests/RunCMake/File_Generate/EmptyCondition2-stderr.txt
@@ -0,0 +1,4 @@
+CMake Error at EmptyCondition2.cmake:2 \(file\):
+  file CONDITION of sub-command GENERATE must not be empty if specified.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)
diff --git a/Tests/RunCMake/File_Generate/EmptyCondition2.cmake b/Tests/RunCMake/File_Generate/EmptyCondition2.cmake
new file mode 100644
index 0000000..626bfb4
--- /dev/null
+++ b/Tests/RunCMake/File_Generate/EmptyCondition2.cmake
@@ -0,0 +1,5 @@
+
+file(GENERATE OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/output.txt"
+              INPUT "${CMAKE_CURRENT_SOURCE_DIR}/input.txt"
+              CONDITION ""
+)
diff --git a/Tests/RunCMake/File_Generate/OutputConflict-result.txt b/Tests/RunCMake/File_Generate/OutputConflict-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/File_Generate/OutputConflict-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/File_Generate/OutputConflict-stderr.txt b/Tests/RunCMake/File_Generate/OutputConflict-stderr.txt
new file mode 100644
index 0000000..dbd39de
--- /dev/null
+++ b/Tests/RunCMake/File_Generate/OutputConflict-stderr.txt
@@ -0,0 +1,5 @@
+CMake Error in CMakeLists.txt:
+  Evaluation file to be written multiple times for different configurations
+  with different content:
+
+  .*output.txt
diff --git a/Tests/RunCMake/File_Generate/OutputConflict.cmake b/Tests/RunCMake/File_Generate/OutputConflict.cmake
new file mode 100644
index 0000000..7f3e8c7
--- /dev/null
+++ b/Tests/RunCMake/File_Generate/OutputConflict.cmake
@@ -0,0 +1,4 @@
+
+file(GENERATE OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/output.txt"
+              INPUT "${CMAKE_CURRENT_SOURCE_DIR}/input.txt"
+)
diff --git a/Tests/RunCMake/File_Generate/RunCMakeTest.cmake b/Tests/RunCMake/File_Generate/RunCMakeTest.cmake
new file mode 100644
index 0000000..f07431c
--- /dev/null
+++ b/Tests/RunCMake/File_Generate/RunCMakeTest.cmake
@@ -0,0 +1,10 @@
+include(RunCMake)
+
+run_cmake(CommandConflict)
+if("${RunCMake_GENERATOR}" MATCHES "Visual Studio" OR "${RunCMake_GENERATOR}" MATCHES "XCode" )
+    run_cmake(OutputConflict)
+endif()
+run_cmake(EmptyCondition1)
+run_cmake(EmptyCondition2)
+run_cmake(BadCondition)
+run_cmake(DebugEvaluate)
diff --git a/Tests/RunCMake/File_Generate/input.txt b/Tests/RunCMake/File_Generate/input.txt
new file mode 100644
index 0000000..3db429d
--- /dev/null
+++ b/Tests/RunCMake/File_Generate/input.txt
@@ -0,0 +1 @@
+Some $<$<CONFIG:Debug>:conflicting> $<$<NOT:$<CONFIG:Debug>>:content>