qmake: add 'ldlibs_common' to Qt5 apps

* add the '-lgcc' to ldlibs_common and use ldlibs_common
  also for qmake (as done by the other build systems)
* remove libgcc locating code for qmake

issue genodelabs#68

share/goa/lib/build/qmake.tcl

@@ -45,19 +45,11 @@ proc create_or_update_build_dir { } {
 	append qmake_cflags "-I$build_dir/qmake_root/include/QtCore/spec/$qmake_platform"
 
 	set qmake_ldlibs { }
-	lappend qmake_ldlibs -nostdlib
-	lappend qmake_ldlibs -L$abi_dir
 	lappend qmake_ldlibs -l:libc.lib.so
 	lappend qmake_ldlibs -l:libm.lib.so
 	lappend qmake_ldlibs -l:stdcxx.lib.so
 	lappend qmake_ldlibs -l:qt5_component.lib.so
 
-	if {$arch == "x86_64"} {
-		lappend qmake_ldlibs [file normalize [exec $cross_dev_prefix\gcc -m64 -print-libgcc-file-name]]
-	} else {
-		lappend qmake_ldlibs [file normalize [exec $cross_dev_prefix\gcc -print-libgcc-file-name]]
-	}
-
 	set ::env(GENODE_QMAKE_CC)           "${cross_dev_prefix}gcc"
 	set ::env(GENODE_QMAKE_CXX)          "${cross_dev_prefix}g++"
 	set ::env(GENODE_QMAKE_LINK)         "${cross_dev_prefix}g++"
@@ -66,7 +58,7 @@ proc create_or_update_build_dir { } {
 	set ::env(GENODE_QMAKE_NM)           "${cross_dev_prefix}nm"
 	set ::env(GENODE_QMAKE_STRIP)        "${cross_dev_prefix}strip"
 	set ::env(GENODE_QMAKE_CFLAGS)       "$qmake_cflags"
-	set ::env(GENODE_QMAKE_LFLAGS_APP)   "-nostdlib $ldflags $ldlibs_exe $qmake_ldlibs"
+	set ::env(GENODE_QMAKE_LFLAGS_APP)   "-nostdlib $ldflags $ldlibs_common $ldlibs_exe $qmake_ldlibs"
 	set ::env(GENODE_QMAKE_LFLAGS_SHLIB) "-nostdlib $ldflags_so $ldlibs_common $ldlibs_so $qmake_ldlibs"
 
 

share/goa/lib/flags.tcl

@@ -90,6 +90,7 @@ lappend ldlibs_common -L$abi_dir
 
 set     ldlibs_exe    { }
 lappend ldlibs_exe   -Wl,--dynamic-linker=ld.lib.so
+lappend ldlibs_exe   -Wl,-lgcc
 #
 # this is neeed so "main", "Component::construct" are dynamic symbols
 # and ld.lib.so can find them