Refactor configure_link_flags for modularity. NFC
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@226174 91177308-0d34-0410-b5e6-96231b3b80d8
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		@@ -330,6 +330,20 @@ class Configuration(object):
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    def configure_link_flags(self):
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        self.link_flags += ['-nodefaultlibs']
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        # Configure library path
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        self.configure_link_flags_cxx_library_path()
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        self.configure_link_flags_abi_library_path()
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        # Configure libraries
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        self.configure_link_flags_cxx_library()
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        self.configure_link_flags_abi_library()
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        self.configure_extra_library_flags()
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        link_flags_str = self.get_lit_conf('link_flags', '')
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        self.link_flags += shlex.split(link_flags_str)
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    def configure_link_flags_cxx_library_path(self):
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        libcxx_library = self.get_lit_conf('libcxx_library')
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        # Configure libc++ library paths.
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        if libcxx_library is not None:
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@@ -347,20 +361,14 @@ class Configuration(object):
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        elif not self.use_system_cxx_lib:
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            self.link_flags += ['-L' + self.cxx_library_root,
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                                '-Wl,-rpath,' + self.cxx_library_root]
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    def configure_link_flags_abi_library_path(self):
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        # Configure ABI library paths.
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        abi_library_path = self.get_lit_conf('abi_library_path', '')
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        if abi_library_path:
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            self.link_flags += ['-L' + abi_library_path,
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                                '-Wl,-rpath,' + abi_library_path]
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        # Configure libraries
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        self.configure_link_flags_cxx_library()
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        self.configure_link_flags_abi_library()
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        self.configure_extra_library_flags()
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        link_flags_str = self.get_lit_conf('link_flags', '')
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        self.link_flags += shlex.split(link_flags_str)
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    def configure_link_flags_cxx_library(self):
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        libcxx_library = self.get_lit_conf('libcxx_library')
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        if libcxx_library:
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