Ninja: Fix variable duplication in RSP rules
Stream clear() resets stream state but does not actually clear its content.
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@ -205,7 +205,7 @@ void cmGlobalNinjaGenerator::WriteBuild(std::ostream& os,
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&& args.size() + buildstr.size() + assignments.size()
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> (size_t) cmdLineLimit) {
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buildstr += "_RSP_FILE";
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variable_assignments.clear();
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variable_assignments.str(std::string());
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cmGlobalNinjaGenerator::WriteVariable(variable_assignments,
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"RSP_FILE", rspfile, "", 1);
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assignments += variable_assignments.str();
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