From 45dc41d758bc434b3a00e2083d9808d12c4be3eb Mon Sep 17 00:00:00 2001
From: Marko Petric <marko.petric@cern.ch>
Date: Fri, 20 Nov 2020 21:16:13 +0100
Subject: [PATCH] Resolve which type of linker is used and pass appropriate
flags
---
cmake/DD4hepBuild.cmake | 22 +++++++++++++++++++---
1 file changed, 19 insertions(+), 3 deletions(-)
diff --git a/cmake/DD4hepBuild.cmake b/cmake/DD4hepBuild.cmake
index 088abfa8c..5b5c88c08 100644
--- a/cmake/DD4hepBuild.cmake
+++ b/cmake/DD4hepBuild.cmake
@@ -80,12 +80,28 @@ macro(dd4hep_set_compiler_flags)
message( STATUS "Unknown thread library: CMAKE_SHARED_LINKER_FLAGS ${CMAKE_SHARED_LINKER_FLAGS}" )
endif()
- if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "AppleClang")
+ # resolve which linker we use
+ execute_process(COMMAND ${CMAKE_CXX_COMPILER} -Wl,--version OUTPUT_VARIABLE stdout ERROR_QUIET)
+ if("${stdout}" MATCHES "GNU ")
+ set(LINKER_TYPE "GNU")
+ dd4hep_debug("|DDD> Detected GNU compatible linker: ${stdout}" )
+ else()
+ execute_process(COMMAND ${CMAKE_CXX_COMPILER} -Wl,-v ERROR_VARIABLE stderr )
+ if(("${stderr}" MATCHES "PROGRAM:ld") AND ("${stderr}" MATCHES "PROJECT:ld64"))
+ set(LINKER_TYPE "APPLE")
+ dd4hep_debug("|DDD> Detected Apple linker: ${stderr}" )
+ else()
+ set(LINKER_TYPE "unknown")
+ dd4hep_debug("|DDD> Detected unknown linker: ${stdout} ${stderr}" )
+ endif()
+ endif()
+
+ if("${LINKER_TYPE}" STREQUAL "APPLE")
SET ( CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-undefined,error")
- elseif ( ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang") OR ( "${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" ))
+ elseif("${LINKER_TYPE}" STREQUAL "GNU")
SET ( CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,--no-undefined")
else()
- MESSAGE( WARNING "We do not test with the ${CMAKE_CXX_COMPILER_ID} compiler, use at your own discretion" )
+ MESSAGE( WARNING "No known linker (GNU or Apple) has been detected, pass no flags to linker" )
endif()
#---RPATH options-------------------------------------------------------------------------------
--
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