From b7d677ac9a99ee137c2b8bb75503ce1156a7b650 Mon Sep 17 00:00:00 2001
From: "Tobias C. Berner" <tcberner@FreeBSD.org>
Date: Wed, 26 Dec 2018 11:37:55 +0100
Subject: [PATCH] FreeBSD: lld does not support -Wl,-z,nodump

---
 CMakeLists.txt                  |  6 +++++-
 cmake/modules/CheckNodump.cmake | 23 +++++++++++++++++++++++
 2 files changed, 28 insertions(+), 1 deletion(-)
 create mode 100644 cmake/modules/CheckNodump.cmake

diff --git CMakeLists.txt CMakeLists.txt
index c8e9b3715..5e4e4ceae 100644
--- CMakeLists.txt
+++ CMakeLists.txt
@@ -295,8 +295,12 @@ IF (UNIX OR APPLE OR ANDROID)
     SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${SEC_COMP_FLAGS}")
     SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${SEC_COMP_FLAGS}")
     SET(SEC_LINK_FLAGS "")
+
+    include("${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules/CheckNodump.cmake")
+    check_nodump(NODUMP_FLAGS)
+
     IF (NOT APPLE)
-        SET(SEC_LINK_FLAGS "${SEC_LINK_FLAGS} -Wl,-z,nodump -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,now")
+       SET(SEC_LINK_FLAGS "${SEC_LINK_FLAGS} ${NODUMP_FLAGS} -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,now")
     ENDIF ()
     IF (NOT ANDROID AND NOT APPLE)
         SET(SEC_LINK_FLAGS "${SEC_LINK_FLAGS} -pie")
diff --git cmake/modules/CheckNodump.cmake cmake/modules/CheckNodump.cmake
new file mode 100644
index 000000000..a04bc074b
--- /dev/null
+++ cmake/modules/CheckNodump.cmake
@@ -0,0 +1,23 @@
+# Check if the linker supports -Wl,z,nodump
+
+function(check_nodump result)
+  set(NODUMP_FLAGS "-Wl,-z,nodump")
+  cmake_policy(SET CMP0056 NEW)
+  set(CMAKE_EXE_LINKER_FLAGS "${NODUMP_FLAGS}")
+  set(TEST_PROGRAM "int main() { return 0 ; }")
+  set(TEST_FILE "${CMAKE_CURRENT_BINARY_DIR}/test_nodump.cc")
+  file(WRITE "${TEST_FILE}" "${TEST_PROGRAM}")
+
+  message(STATUS "Checking whether the linker supports ${NODUMP_FLAGS} ...")
+  try_compile(SUPPORT_NODUMP
+              "${CMAKE_CURRENT_BINARY_DIR}/try_has_nodump"
+              "${TEST_FILE}"
+  )
+  message(STATUS "  supports ${NODUMP_FLAGS}: ${SUPPORT_NODUMP}")
+
+  if(SUPPORT_NODUMP)
+    set(${result} "${NODUMP_FLAGS}")
+  else()
+    set(${result} "")
+  endif()
+endfunction()
-- 
2.20.1

