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What are mkspecs for clang to create qt?

if I want to build qt under Windows with gcc, the configure parameter is platform32 win32-g ++, but what is the option when I want to build qt with clang?

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For the clang / windows combination, no. I assume that you can easily change win32-g ++ to win32-clang, though, following the differences between linux-g ++ and linux-clang:

diff -w -u ../linux-g++/qmake.conf ./qmake.conf
--- ../linux-g++/qmake.conf 2012-11-20 16:38:28.000000000 +0100
+++ ./qmake.conf    2012-11-20 16:38:28.000000000 +0100
@@ -1,12 +1,16 @@
 #
-# qmake configuration for linux-g++
+# qmake configuration for linux-clang
 #

 MAKEFILE_GENERATOR = UNIX
-CONFIG += incremental gdb_dwarf_index
+CONFIG += incremental
+
 QMAKE_INCREMENTAL_STYLE = sublib

 include(../common/linux.conf)
 include(../common/gcc-base-unix.conf)
-include(../common/g++-unix.conf)
+include(../common/clang.conf)
+
+QMAKE_LFLAGS += -ccc-gcc-name g++
+
 load(qt_config)
 diff -w -u ../linux-g++/qplatformdefs.h ./qplatformdefs.h
--- ../linux-g++/qplatformdefs.h    2013-01-28 17:42:15.170318229 +0100
+++ ./qplatformdefs.h   2013-01-28 17:42:15.170318229 +0100
@@ -67,6 +66,7 @@
 #include <grp.h>
 #include <pwd.h>
 #include <signal.h>
+#include <dlfcn.h>

 #include <sys/types.h>
 #include <sys/ioctl.h>
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