try_compile: Add signature to allow multiple SOURCES

Extend the signature

 try_compile(RESULT_VAR <bindir> <srcfile> ...)

to allow multiple sources as

 try_compile(RESULT_VAR <bindir> SOURCES <srcfile>... ...)

Process the sources to generate a CMakeLists.txt that enables all needed
languages.

Teach the TryCompile test to try cases with two sources of the same
language and of mixed languages.  Teach RunCMake.try_compile to cover
error cases for the signature.

10 files changed, 41 insertions, 0 deletions

diff --git a/Tests/RunCMake/try_compile/BadSources1-result.txt b/Tests/RunCMake/try_compile/BadSources1-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/try_compile/BadSources1-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/try_compile/BadSources1-stderr.txt b/Tests/RunCMake/try_compile/BadSources1-stderr.txt
new file mode 100644
index 0000000..864a294
--- /dev/null
+++ b/Tests/RunCMake/try_compile/BadSources1-stderr.txt
@@ -0,0 +1,12 @@
+CMake Error at BadSources1.cmake:1 \(try_compile\):
+  Unknown extension ".c" for file
+
+    .*/Tests/RunCMake/try_compile/src.c
+
+  try_compile\(\) works only for enabled languages.  Currently these are:
+
+    NONE
+
+  See project\(\) command to enable other languages.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)
diff --git a/Tests/RunCMake/try_compile/BadSources1.cmake b/Tests/RunCMake/try_compile/BadSources1.cmake
new file mode 100644
index 0000000..aa4dc5e
--- /dev/null
+++ b/Tests/RunCMake/try_compile/BadSources1.cmake
@@ -0,0 +1 @@
+try_compile(RESULT ${CMAKE_CURRENT_BINARY_DIR} SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/src.c)
diff --git a/Tests/RunCMake/try_compile/BadSources2-result.txt b/Tests/RunCMake/try_compile/BadSources2-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/try_compile/BadSources2-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/try_compile/BadSources2-stderr.txt b/Tests/RunCMake/try_compile/BadSources2-stderr.txt
new file mode 100644
index 0000000..3313f99
--- /dev/null
+++ b/Tests/RunCMake/try_compile/BadSources2-stderr.txt
@@ -0,0 +1,12 @@
+CMake Error at BadSources2.cmake:2 \(try_compile\):
+  Unknown extension ".cxx" for file
+
+    .*/Tests/RunCMake/try_compile/src.cxx
+
+  try_compile\(\) works only for enabled languages.  Currently these are:
+
+    C NONE( RC)?
+
+  See project\(\) command to enable other languages.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)
diff --git a/Tests/RunCMake/try_compile/BadSources2.cmake b/Tests/RunCMake/try_compile/BadSources2.cmake
new file mode 100644
index 0000000..ed2b036
--- /dev/null
+++ b/Tests/RunCMake/try_compile/BadSources2.cmake
@@ -0,0 +1,5 @@
+enable_language(C)
+try_compile(RESULT ${CMAKE_CURRENT_BINARY_DIR}
+  SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/src.c
+          ${CMAKE_CURRENT_SOURCE_DIR}/src.cxx
+  )
diff --git a/Tests/RunCMake/try_compile/NoSources-result.txt b/Tests/RunCMake/try_compile/NoSources-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/try_compile/NoSources-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/try_compile/NoSources-stderr.txt b/Tests/RunCMake/try_compile/NoSources-stderr.txt
new file mode 100644
index 0000000..023032b
--- /dev/null
+++ b/Tests/RunCMake/try_compile/NoSources-stderr.txt
@@ -0,0 +1,4 @@
+CMake Error at NoSources.cmake:1 \(try_compile\):
+  SOURCES must be followed by at least one source file
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)
diff --git a/Tests/RunCMake/try_compile/NoSources.cmake b/Tests/RunCMake/try_compile/NoSources.cmake
new file mode 100644
index 0000000..8a73af4
--- /dev/null
+++ b/Tests/RunCMake/try_compile/NoSources.cmake
@@ -0,0 +1 @@
+try_compile(RESULT ${CMAKE_CURRENT_BINARY_DIR} SOURCES)
diff --git a/Tests/RunCMake/try_compile/RunCMakeTest.cmake b/Tests/RunCMake/try_compile/RunCMakeTest.cmake
index 31643cf..3494695 100644
--- a/Tests/RunCMake/try_compile/RunCMakeTest.cmake
+++ b/Tests/RunCMake/try_compile/RunCMakeTest.cmake
@@ -7,6 +7,9 @@ run_cmake(NoCopyFile)
 run_cmake(NoCopyFile2)
 run_cmake(NoOutputVariable)
 run_cmake(NoOutputVariable2)
+run_cmake(NoSources)
 run_cmake(BadLinkLibraries)
+run_cmake(BadSources1)
+run_cmake(BadSources2)
 run_cmake(NonSourceCopyFile)
 run_cmake(NonSourceCompileDefinitions)