build: build with -Wl,--no-undefined

This should make updating submodules much more straightforward.
quixdb · Oct 31, 2015 · e3e906e · e3e906e
1 parent df073d2
commit e3e906e
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diff --git a/CMakeLists.txt b/CMakeLists.txt
@@ -9,6 +9,7 @@ include (ExtraWarningFlags)
 include (CheckFunctionExists)
 include (CheckIncludeFile)
 include (AddCompilerFlags)
+include (NoUndefined)
 
 enable_testing ()
 

diff --git a/cmake/NoUndefined.cmake b/cmake/NoUndefined.cmake
@@ -0,0 +1,14 @@
+# This adds -Wl,--no-undefined (if it works).  It should help identify
+# issues, especially when updating submodules.
+
+include (CheckCCompilerFlag)
+
+set (OLD_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
+set (CMAKE_REQUIRED_FLAGS "-Wl,--no-undefined")
+check_c_compiler_flag ("" CFLAG_Wl___no_undefined)
+if (CFLAG_Wl___no_undefined)
+  set (CMAKE_SHARED_LINKER_FLAGS "-Wl,--no-undefined ${CMAKE_SHARED_LINKER_FLAGS}")
+  set (CMAKE_MODULE_LINKER_FLAGS "-Wl,--no-undefined ${CMAKE_MODULE_LINKER_FLAGS}")
+  set (CMAKE_EXE_LINKER_FLAGS "-Wl,--no-undefined ${CMAKE_EXE_LINKER_FLAGS}")
+endif ()
+set (CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")