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When cross compiling with clang-cl, clang splits the INCLUDE env variable around semicolons (clang/lib/Driver/ToolChains/MSVC.cpp, MSVCToolChain::AddClangSystemIncludeArgs) and lld splits the LIB variable similarly (lld/COFF/Driver.cpp, LinkerDriver::addLibSearchPaths). Therefore, the consensus for cross compilation with clang-cl and lld-link seems to be to use semicolons, despite path lists normally being separated by colons on unix and EnvPathSeparator being set to that. Therefore, handle the LIB variable similarly in Clang, when handling lib file arguments when driving linking via Clang. This fixes commands like "clang-cl test.c -Fetest.exe kernel32.lib" in a cross compilation setting. Normally, most users call (lld-)link directly, but meson happens to use this command syntax for has_function() tests. Differential Revision: https://reviews.llvm.org/D88002
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