Fixes for Ubuntu 22.04. Do not link libraries loaded later (#1466)

* Switch off trapfpe in case of problematic libxml2

* Do not link libraries that are loaded later

---------

Co-authored-by: hristov <peter.Hristov@cern.ch>

ALIROOT/CMakeLists.txt

@@ -18,11 +18,15 @@
 # Module include folder
 include_directories(${AliRoot_SOURCE_DIR}/ALIROOT)
 
+find_package(LibXml2 REQUIRED)
+message("LIBXML2_INCLUDE_DIR ->  ${LIBXML2_INCLUDE_DIR}")
+
 # Additional include folders in alphabetical order
 include_directories(
                     ${AliRoot_BINARY_DIR}/version
                     ${AliRoot_SOURCE_DIR}/STEER/STEER
                     ${AliRoot_SOURCE_DIR}/STEER/STEERBase
+		    ${LIBXML2_INCLUDE_DIR}
                    )
 
 # aliroot executable

ALIROOT/fpu.c

@@ -1,4 +1,6 @@
 #ifdef __linux
+#include <libxml/xmlversion.h>
+#if LIBXML_VERSION < 20913
 #define _GNU_SOURCE 1
 #include <fenv.h>
 static void __attribute__ ((constructor)) trapfpe(void)
@@ -9,3 +11,6 @@ static void __attribute__ ((constructor)) trapfpe(void)
 #else
 void trapfpe () {}
 #endif
+#else
+void trapfpe () {}
+#endif

PYTHIA6/AliPythia6/CMakeLists.txt

@@ -62,7 +62,7 @@ generate_dictionary("${MODULE}" "${MODULE}LinkDef.h" "${HDRS}" "${incdirs}")
 
 # Generate the ROOT map
 # Dependecies
-set(LIBDEPS STEERBase STEER EVGEN FASTSIM EGPythia6 pythia6 microcern lhapdfbase)
+set(LIBDEPS STEERBase STEER EVGEN EGPythia6)
 generate_rootmap("${MODULE}" "${LIBDEPS}" "${CMAKE_CURRENT_SOURCE_DIR}/${MODULE}LinkDef.h")