Test OBJECT library success cases

Add "ObjectLibrary" test to build and use OBJECT libraries.  Build
multiple object libraries in separate directories with different flags.
Use a custom command to generate a source file in one OBJECT library.

Reference the OBJECT libraries for inclusion in a STATIC library, a
SHARED library, and an EXECUTABLE target.  Use the static and shared
libraries each in executables that end up using the object library
symbols.  Verify that object library symbols are exported from the
shared library.

4 files changed, 27 insertions, 0 deletions

diff --git a/Tests/ObjectLibrary/A/CMakeLists.txt b/Tests/ObjectLibrary/A/CMakeLists.txt
new file mode 100644
index 0000000..e0a620e
--- /dev/null
+++ b/Tests/ObjectLibrary/A/CMakeLists.txt
@@ -0,0 +1,17 @@
+# Add -fPIC so objects can be used in shared libraries.
+# TODO: Need property for this.
+if(CMAKE_SHARED_LIBRARY_C_FLAGS)
+  set(CMAKE_C_FLAGS "${CMAKE_SHARED_LIBRARY_C_FLAGS} ${CMAKE_C_FLAGS}")
+endif()
+
+add_definitions(-DA)
+
+add_custom_command(
+  OUTPUT a1.c
+  DEPENDS a1.c.in
+  COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_CURRENT_SOURCE_DIR}/a1.c.in
+                                   ${CMAKE_CURRENT_BINARY_DIR}/a1.c
+  )
+include_directories(${CMAKE_CURRENT_SOURCE_DIR})
+
+add_library(A OBJECT a1.c a2.c)
diff --git a/Tests/ObjectLibrary/A/a.h b/Tests/ObjectLibrary/A/a.h
new file mode 100644
index 0000000..6bfbc82
--- /dev/null
+++ b/Tests/ObjectLibrary/A/a.h
@@ -0,0 +1,6 @@
+#ifndef A
+# error "A not defined"
+#endif
+#ifdef B
+# error "B must not be defined"
+#endif
diff --git a/Tests/ObjectLibrary/A/a1.c.in b/Tests/ObjectLibrary/A/a1.c.in
new file mode 100644
index 0000000..d1eaf58
--- /dev/null
+++ b/Tests/ObjectLibrary/A/a1.c.in
@@ -0,0 +1,2 @@
+#include "a.h"
+int a1(void) { return 0; }
diff --git a/Tests/ObjectLibrary/A/a2.c b/Tests/ObjectLibrary/A/a2.c
new file mode 100644
index 0000000..d8f225e
--- /dev/null
+++ b/Tests/ObjectLibrary/A/a2.c
@@ -0,0 +1,2 @@
+#include "a.h"
+int a2(void) { return 0; }