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.

15 files changed, 64 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)
diff --git a/Tests/TryCompile/CMakeLists.txt b/Tests/TryCompile/CMakeLists.txt
index b6b66d8..4540fd0 100644
--- a/Tests/TryCompile/CMakeLists.txt
+++ b/Tests/TryCompile/CMakeLists.txt
@@ -71,6 +71,24 @@ if(SHOULD_FAIL)
    message(SEND_ERROR "Should fail passed ${TRY_OUT}")
 endif()
 
+# try to compile two files that should compile
+try_compile(SHOULD_PASS
+    ${TryCompile_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp
+    SOURCES ${TryCompile_SOURCE_DIR}/pass2a.c ${TryCompile_SOURCE_DIR}/pass2b.cxx
+    OUTPUT_VARIABLE TRY_OUT)
+if(NOT SHOULD_PASS)
+  message(SEND_ERROR "should pass failed ${TRY_OUT}")
+endif()
+
+# try to compile two files that should not compile
+try_compile(SHOULD_FAIL
+    ${TryCompile_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp
+    SOURCES ${TryCompile_SOURCE_DIR}/fail2a.c ${TryCompile_SOURCE_DIR}/fail2b.c
+    OUTPUT_VARIABLE TRY_OUT)
+if(SHOULD_FAIL)
+   message(SEND_ERROR "Should fail passed ${TRY_OUT}")
+endif()
+
 if(NOT SHOULD_FAIL)
   if(SHOULD_PASS)
     message("All Tests passed, ignore all previous output.")
diff --git a/Tests/TryCompile/fail2a.c b/Tests/TryCompile/fail2a.c
new file mode 100644
index 0000000..78f2de1
--- /dev/null
+++ b/Tests/TryCompile/fail2a.c
@@ -0,0 +1 @@
+int main(void) { return 0; }
diff --git a/Tests/TryCompile/fail2b.c b/Tests/TryCompile/fail2b.c
new file mode 100644
index 0000000..5ee809c
--- /dev/null
+++ b/Tests/TryCompile/fail2b.c
@@ -0,0 +1 @@
+does_not_compile
diff --git a/Tests/TryCompile/pass2a.c b/Tests/TryCompile/pass2a.c
new file mode 100644
index 0000000..bbfe6d5
--- /dev/null
+++ b/Tests/TryCompile/pass2a.c
@@ -0,0 +1,2 @@
+extern int pass2b(void);
+int main() { return pass2b(); }
diff --git a/Tests/TryCompile/pass2b.cxx b/Tests/TryCompile/pass2b.cxx
new file mode 100644
index 0000000..4c539e2
--- /dev/null
+++ b/Tests/TryCompile/pass2b.cxx
@@ -0,0 +1 @@
+extern "C" int pass2b(void) { return 0; }