Handle targets in the LINK_LIBRARIES of try_compile.

Imported targets are re-exported so that they can be used by the
try_compile generated code with target_link_libraries.

This makes the use of the cmake_expand_imported_targets macro
obsolete. The macro is not able to expand the generator expressions
which may appear in the IMPORTED_LINK_INTERFACE_LIBRARIES content.
Instead it just sees them as 'not a target'.

1 files changed, 7 insertions, 1 deletions

diff --git a/Source/cmTryCompileCommand.h b/Source/cmTryCompileCommand.h
index 68ec666ecc..6caa130ce0 100644
--- a/Source/cmTryCompileCommand.h
+++ b/Source/cmTryCompileCommand.h
@@ -67,6 +67,7 @@ public:
       "  try_compile(RESULT_VAR <bindir> <srcfile>\n"
       "              [CMAKE_FLAGS flags...]\n"
       "              [COMPILE_DEFINITIONS flags...]\n"
+      "              [LINK_LIBRARIES libs...]\n"
       "              [OUTPUT_VARIABLE <var>]\n"
       "              [COPY_FILE <fileName>])\n"
       "Try building a source file into an executable.  "
@@ -90,7 +91,12 @@ public:
       "Some extra flags that can be included are,  "
       "INCLUDE_DIRECTORIES, LINK_DIRECTORIES, and LINK_LIBRARIES.  "
       "COMPILE_DEFINITIONS are -Ddefinition that will be passed to the "
-      "compile line.  "
+      "compile line.\n"
+      "The srcfile signature also accepts a LINK_LIBRARIES argument which "
+      "may contain a list of libraries or IMPORTED targets which will be "
+      "linked to in the generated project.  If LINK_LIBRARIES is specified "
+      "as a parameter to try_compile, then any LINK_LIBRARIES passed as "
+      "CMAKE_FLAGS will be ignored.\n"
       "try_compile creates a CMakeList.txt "
       "file on the fly that looks like this:\n"
       "  add_definitions( <expanded COMPILE_DEFINITIONS from calling "