cmake: remove obsolete SYSLIBS

Can cause unnecessary extra linking to system libraries. We should
add linking libraries directly to each target that needs it.

build/unix/compiledata.sh

@@ -13,8 +13,6 @@ CXXFLAGS=$5
 SOFLAGS=$6
 LDFLAGS=$7
 SOEXT=$8
-SYSLIBS=$9
-shift
 LIBDIR=$9
 shift
 ROOTLIBS=$9
@@ -123,7 +121,7 @@ else
    echo "#define MAKESHAREDLIB \"$CUSTOMSHARED\"" >> ${COMPILEDATA}.tmp
 fi
 if [ "$CUSTOMEXE" = "" ]; then
-   echo "#define MAKEEXE \"cd \$BuildDir ; $BXX -c $OPT $CXXFLAGS \$IncludePath \$SourceFiles; $BXX \$ObjectFiles $LDFLAGS -o \$ExeName \$LinkedLibs $SYSLIBS\""  >> ${COMPILEDATA}.tmp
+   echo "#define MAKEEXE \"cd \$BuildDir ; $BXX -c $OPT $CXXFLAGS \$IncludePath \$SourceFiles; $BXX \$ObjectFiles $LDFLAGS -o \$ExeName \$LinkedLibs\""  >> ${COMPILEDATA}.tmp
 else
    echo "#define MAKEEXE \"$CUSTOMEXE\"" >> ${COMPILEDATA}.tmp
 fi

cmake/modules/RootConfiguration.cmake

@@ -680,7 +680,7 @@ else()
   execute_process(COMMAND ${CMAKE_SOURCE_DIR}/build/unix/compiledata.sh
     ${CMAKE_BINARY_DIR}/include/compiledata.h "${CMAKE_CXX_COMPILER}"
         "${CMAKE_CXX_FLAGS_RELEASE}" "${CMAKE_CXX_FLAGS_DEBUG}" "${CMAKE_CXX_FLAGS}"
-        "${CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS}" "${CMAKE_EXE_FLAGS}" "so" "${SYSLIBS}"
+        "${CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS}" "${CMAKE_EXE_FLAGS}" "so"
         "${libdir}" "-lCore" "-lRint" "${incdir}" "" "" "${ROOT_ARCHITECTURE}" "" "${explicitlink}" )
 endif()
 

cmake/modules/SetUpLinux.cmake

@@ -85,7 +85,6 @@ else()
   endif()
 endif()
 
-set(SYSLIBS "-lm -ldl ${CMAKE_THREAD_LIBS_INIT} -rdynamic")
 # JIT must be able to resolve symbols from all ROOT binaries.
 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -rdynamic")
 

cmake/modules/SetUpMacOS.cmake

 set(ROOT_ARCHITECTURE macosx)
 set(ROOT_PLATFORM macosx)
 
-set(SYSLIBS "-lm ${EXTRA_LDFLAGS} ${FINK_LDFLAGS} ${CMAKE_THREAD_LIBS_INIT} -ldl")
-
 #---This is needed to help CMake to locate the X11 headers in the correct place and not under /usr/include
 set(CMAKE_PREFIX_PATH ${CMAKE_PREFIX_PATH} /usr/X11R6)
 #---------------------------------------------------------------------------------------------------------

cmake/modules/SetUpWindows.cmake

 set(ROOT_PLATFORM win32)
 
-#---Global variables for Win32 platform-------------------------------------------------
-set(SYSLIBS advapi32.lib)
-
 #----Check the compiler that is used-----------------------------------------------------
 if(CMAKE_COMPILER_IS_GNUCXX)
 

etc/Makefile.arch

@@ -373,8 +373,8 @@ endif
 
 CXXFLAGS     += $(ROOTCFLAGS)
 LDFLAGS      += $(ROOTLDFLAGS)
-LIBS          = $(ROOTLIBS) $(SYSLIBS)
-GLIBS         = $(ROOTGLIBS) $(SYSLIBS)
+LIBS          = $(ROOTLIBS)
+GLIBS         = $(ROOTGLIBS)
 
 ifneq ($(ALTCC),)
    CC  = $(ALTCC)

proof/proofd/CMakeLists.txt

@@ -51,7 +51,6 @@ else()
       ${PROOFD_SOURCES}
       LIBRARIES
         ${XROOTD_LIBRARIES}
-        ${SYSLIBS}
       BUILTINS
         XROOTD
     )
@@ -73,7 +72,5 @@ else()
     proofexecv.cxx
     ${CMAKE_SOURCE_DIR}/net/rpdutils/src/rpdconn.cxx
     ${CMAKE_SOURCE_DIR}/net/rpdutils/src/rpdpriv.cxx
-    LIBRARIES
-      ${SYSLIBS}
   )
 endif()