Forbid undefined symbols in shared libraries.

Also a little bit of refactoring:
- Moved add_cflag and friends from CMakeLists.txt to a separate
  AddCompilerFlag module.
- Build the spectest SUT if msgpack is found, even if spectest itself is
  not found, so once it exists, users can run it themselves or
  reconfigure cmake.

1 files changed, 46 insertions, 0 deletions

diff --git a/cmake/AddCompilerFlag.cmake b/cmake/AddCompilerFlag.cmake
new file mode 100644
index 00000000..78102dcc
--- /dev/null
+++ b/cmake/AddCompilerFlag.cmake
@@ -0,0 +1,46 @@
+include(CheckCCompilerFlag)
+include(CheckCXXCompilerFlag)
+
+function(add_cflag flag)
+  string(REGEX REPLACE "[^a-zA-Z0-9_]" "_" var ${flag})
+  if(NOT DEFINED HAVE_C${var})
+    message(STATUS "checking for C compiler flag: ${flag}")
+  endif()
+  set(CMAKE_REQUIRED_QUIET TRUE)
+
+  check_c_compiler_flag("${flag}" HAVE_C${var} QUIET)
+  if(HAVE_C${var})
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${flag}" PARENT_SCOPE)
+  endif()
+endfunction()
+
+function(add_cxxflag flag)
+  string(REGEX REPLACE "[^a-zA-Z0-9_]" "_" var ${flag})
+  if(NOT DEFINED HAVE_CXX${var})
+    message(STATUS "checking for C++ compiler flag: ${flag}")
+  endif()
+  set(CMAKE_REQUIRED_QUIET TRUE)
+
+  check_cxx_compiler_flag("${flag}" HAVE_CXX${var} QUIET)
+  if(HAVE_CXX${var})
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}" PARENT_SCOPE)
+  endif()
+endfunction()
+
+function(add_dllflag flag)
+  string(REGEX REPLACE "[^a-zA-Z0-9_]" "_" var ${flag})
+  if(NOT DEFINED HAVE_LD${var})
+    message(STATUS "checking for C++ compiler flag: ${flag}")
+  endif()
+  set(CMAKE_REQUIRED_QUIET TRUE)
+
+  check_c_compiler_flag("${flag}" HAVE_LD${var} QUIET)
+  if(HAVE_LD${var})
+    set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${flag}" PARENT_SCOPE)
+  endif()
+endfunction()
+
+macro(add_flag flag)
+  add_cflag(${flag})
+  add_cxxflag(${flag})
+endmacro()