try_compile: Add SOURCE_FROM_{ARG,VAR}

Add ability to "feed" try_compile (and try_run) sources more directly,
either from literal content, or from a CMake variable which contains
literal content. This saves the user from needing a separate step to
write the content to a file, and allows for the sources to only exist in
the scratch directory.

11 files changed, 64 insertions, 0 deletions

diff --git a/Tests/RunCMake/try_compile/RunCMakeTest.cmake b/Tests/RunCMake/try_compile/RunCMakeTest.cmake
index bb11a57..0aa9039 100644
--- a/Tests/RunCMake/try_compile/RunCMakeTest.cmake
+++ b/Tests/RunCMake/try_compile/RunCMakeTest.cmake
@@ -20,6 +20,10 @@ set(RunCMake_TEST_OPTIONS -Dtry_compile_DEFS=new_signature.cmake)
 include(${RunCMake_SOURCE_DIR}/old_and_new_signature_tests.cmake)
 unset(RunCMake_TEST_OPTIONS)
 
+run_cmake(SourceFromOneArg)
+run_cmake(SourceFromThreeArgs)
+run_cmake(SourceFromBadName)
+
 run_cmake(ProjectCopyFile)
 run_cmake(NonSourceCopyFile)
 run_cmake(NonSourceCompileDefinitions)
diff --git a/Tests/RunCMake/try_compile/SourceFromBadName-result.txt b/Tests/RunCMake/try_compile/SourceFromBadName-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/try_compile/SourceFromBadName-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/try_compile/SourceFromBadName-stderr.txt b/Tests/RunCMake/try_compile/SourceFromBadName-stderr.txt
new file mode 100644
index 0000000..ef6847c
--- /dev/null
+++ b/Tests/RunCMake/try_compile/SourceFromBadName-stderr.txt
@@ -0,0 +1,4 @@
+CMake Error at SourceFromBadName.cmake:[0-9]+ \(try_compile\):
+  SOURCES_FROM_ARG given invalid filename "bad/name.c"
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)
diff --git a/Tests/RunCMake/try_compile/SourceFromBadName.cmake b/Tests/RunCMake/try_compile/SourceFromBadName.cmake
new file mode 100644
index 0000000..e53a73f
--- /dev/null
+++ b/Tests/RunCMake/try_compile/SourceFromBadName.cmake
@@ -0,0 +1 @@
+try_compile(RESULT SOURCE_FROM_ARG bad/name.c "int main();")
diff --git a/Tests/RunCMake/try_compile/SourceFromOneArg-result.txt b/Tests/RunCMake/try_compile/SourceFromOneArg-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/try_compile/SourceFromOneArg-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/try_compile/SourceFromOneArg-stderr.txt b/Tests/RunCMake/try_compile/SourceFromOneArg-stderr.txt
new file mode 100644
index 0000000..bebe8bb
--- /dev/null
+++ b/Tests/RunCMake/try_compile/SourceFromOneArg-stderr.txt
@@ -0,0 +1,4 @@
+CMake Error at SourceFromOneArg.cmake:[0-9]+ \(try_compile\):
+  SOURCE_FROM_ARG requires exactly two arguments
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)
diff --git a/Tests/RunCMake/try_compile/SourceFromOneArg.cmake b/Tests/RunCMake/try_compile/SourceFromOneArg.cmake
new file mode 100644
index 0000000..39ca11e
--- /dev/null
+++ b/Tests/RunCMake/try_compile/SourceFromOneArg.cmake
@@ -0,0 +1 @@
+try_compile(RESULT SOURCE_FROM_ARG test.c)
diff --git a/Tests/RunCMake/try_compile/SourceFromThreeArgs-result.txt b/Tests/RunCMake/try_compile/SourceFromThreeArgs-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/try_compile/SourceFromThreeArgs-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/try_compile/SourceFromThreeArgs-stderr.txt b/Tests/RunCMake/try_compile/SourceFromThreeArgs-stderr.txt
new file mode 100644
index 0000000..2cf201d
--- /dev/null
+++ b/Tests/RunCMake/try_compile/SourceFromThreeArgs-stderr.txt
@@ -0,0 +1,4 @@
+CMake Error at SourceFromThreeArgs.cmake:[0-9]+ \(try_compile\):
+  SOURCE_FROM_ARG requires exactly two arguments
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)
diff --git a/Tests/RunCMake/try_compile/SourceFromThreeArgs.cmake b/Tests/RunCMake/try_compile/SourceFromThreeArgs.cmake
new file mode 100644
index 0000000..af6340d
--- /dev/null
+++ b/Tests/RunCMake/try_compile/SourceFromThreeArgs.cmake
@@ -0,0 +1 @@
+try_compile(RESULT SOURCE_FROM_ARG test.c "int" "main();")
diff --git a/Tests/TryCompile/CMakeLists.txt b/Tests/TryCompile/CMakeLists.txt
index 8ebb00a..9560190 100644
--- a/Tests/TryCompile/CMakeLists.txt
+++ b/Tests/TryCompile/CMakeLists.txt
@@ -64,6 +64,48 @@ set(try_compile_compile_output_var COMPILE_OUT)
 set(try_compile_run_output_var RUN_OUTPUT)
 include(old_and_new_signature_tests.cmake)
 
+# try to compile an empty source specified directly
+try_compile(SHOULD_FAIL_DUE_TO_EMPTY_SOURCE
+  SOURCE_FROM_ARG empty.c "")
+if(SHOULD_FAIL_DUE_TO_EMPTY_SOURCE)
+  message(SEND_ERROR "Trying to compile an empty source succeeded?")
+endif()
+
+try_compile(SHOULD_FAIL_DUE_TO_EMPTY_SOURCE
+  SOURCE_FROM_VAR empty.c NAME_OF_A_VAR_THAT_IS_NOT_SET)
+if(SHOULD_FAIL_DUE_TO_EMPTY_SOURCE)
+  message(SEND_ERROR "Trying to compile an empty source succeeded?")
+endif()
+
+# try to run a source specified directly
+set(TRY_RUN_MAIN_CODE
+  "extern int answer(); \n"
+  "int main() { return answer(); }\n")
+set(TRY_RUN_EXT_CODE
+  "int answer() { return 42; }\n")
+
+try_run(SHOULD_EXIT_WITH_ERROR SHOULD_COMPILE
+  SOURCE_FROM_ARG main.c "${TRY_RUN_MAIN_CODE}"
+  SOURCE_FROM_ARG answer.c "${TRY_RUN_EXT_CODE}"
+  COMPILE_OUTPUT_VARIABLE COMPILE_OUTPUT)
+if(NOT SHOULD_COMPILE)
+  message(SEND_ERROR " SOURCE_FROM_ARG failed compiling: ${COMPILE_OUTPUT}")
+endif()
+if(NOT SHOULD_EXIT_WITH_ERROR EQUAL 42)
+  message(SEND_ERROR " SOURCE_FROM_ARG gave unexpected run result: ${SHOULD_EXIT_WITH_ERROR}")
+endif()
+
+try_run(SHOULD_EXIT_WITH_ERROR SHOULD_COMPILE
+  SOURCE_FROM_VAR main.c TRY_RUN_MAIN_CODE
+  SOURCE_FROM_VAR answer.c TRY_RUN_EXT_CODE
+  COMPILE_OUTPUT_VARIABLE COMPILE_OUTPUT)
+if(NOT SHOULD_COMPILE)
+  message(SEND_ERROR " SOURCE_FROM_VAR failed compiling: ${COMPILE_OUTPUT}")
+endif()
+if(NOT SHOULD_EXIT_WITH_ERROR EQUAL 42)
+  message(SEND_ERROR " SOURCE_FROM_VAR gave unexpected run result: ${SHOULD_EXIT_WITH_ERROR}")
+endif()
+
 # try to compile a project (old signature)
 message("Testing try_compile project mode (old signature)")
 try_compile(TEST_INNER