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Both Rust static libraries carry a copy of std, and MSVC refuses the duplicate unmangled rust_eh_personality lang item. windows-msvc unwinds through __CxxFrameHandler3, so the bridge's copy is renamed after cargo builds it.
92 lines
3.3 KiB
CMake
92 lines
3.3 KiB
CMake
# This file is part of Telegram Desktop,
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# the official desktop application for the Telegram messaging service.
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#
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# For license and copyright information please follow this link:
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# https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
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# Run as a script after cargo builds td_e2e_openmls_bridge on Windows:
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# cmake -D library=<.lib> -D rustc=<rustc> -P rename_rust_eh_personality.cmake
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#
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# Telegram links two Rust static libraries, the openmls bridge and tlottie,
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# and each carries its own copy of std. Everything in std is mangled with the
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# toolchain hash except the rust_eh_personality lang item, so MSVC stops with
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# LNK2005 on it. windows-msvc code unwinds through __CxxFrameHandler3 and never
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# calls rust_eh_personality, so renaming the bridge's copy is safe; tlottie's
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# copy stays the only one with that name. The step is idempotent: a library
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# that already has no such symbol is left untouched.
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if (NOT library OR NOT rustc)
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message(FATAL_ERROR "library and rustc must be set")
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endif()
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set(symbol rust_eh_personality)
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set(renamed zsg_openmls_rust_eh_personality)
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execute_process(
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COMMAND ${rustc} --print sysroot
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OUTPUT_VARIABLE sysroot
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OUTPUT_STRIP_TRAILING_WHITESPACE
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COMMAND_ERROR_IS_FATAL ANY)
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execute_process(
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COMMAND ${rustc} -vV
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OUTPUT_VARIABLE rustc_version
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COMMAND_ERROR_IS_FATAL ANY)
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string(REGEX MATCH "host: ([^\n]+)" _ "${rustc_version}")
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set(tools ${sysroot}/lib/rustlib/${CMAKE_MATCH_1}/bin)
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foreach (tool llvm-ar llvm-nm llvm-objcopy)
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if (NOT EXISTS ${tools}/${tool}.exe)
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message(FATAL_ERROR "${tool} not found in ${tools}: "
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"add the llvm-tools component to rust-toolchain.toml")
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endif()
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endforeach()
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execute_process(
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COMMAND ${tools}/llvm-nm.exe --defined-only ${library}
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OUTPUT_VARIABLE symbols
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ERROR_QUIET
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COMMAND_ERROR_IS_FATAL ANY)
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if (NOT symbols MATCHES " T ${symbol}\n")
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return()
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endif()
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execute_process(
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COMMAND ${tools}/llvm-ar.exe t ${library}
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OUTPUT_VARIABLE members
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COMMAND_ERROR_IS_FATAL ANY)
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string(REGEX MATCHALL "std-[^\n]+\\.rcgu\\.o" std_members "${members}")
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list(REMOVE_DUPLICATES std_members)
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list(LENGTH std_members std_count)
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if (NOT std_count EQUAL 1)
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message(FATAL_ERROR "expected one std object in ${library}, "
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"found ${std_count}: review ${CMAKE_CURRENT_LIST_FILE}")
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endif()
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get_filename_component(library_dir ${library} DIRECTORY)
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set(work ${library_dir}/rename_eh_personality)
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file(REMOVE_RECURSE ${work})
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file(MAKE_DIRECTORY ${work})
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execute_process(
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COMMAND ${tools}/llvm-ar.exe x ${library} ${std_members}
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WORKING_DIRECTORY ${work}
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COMMAND_ERROR_IS_FATAL ANY)
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execute_process(
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COMMAND ${tools}/llvm-objcopy.exe
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--redefine-sym ${symbol}=${renamed}
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${std_members}
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WORKING_DIRECTORY ${work}
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COMMAND_ERROR_IS_FATAL ANY)
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execute_process(
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COMMAND ${tools}/llvm-ar.exe r ${library} ${std_members}
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WORKING_DIRECTORY ${work}
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COMMAND_ERROR_IS_FATAL ANY)
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file(REMOVE_RECURSE ${work})
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execute_process(
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COMMAND ${tools}/llvm-nm.exe --defined-only ${library}
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OUTPUT_VARIABLE symbols
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ERROR_QUIET
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COMMAND_ERROR_IS_FATAL ANY)
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if (symbols MATCHES " T ${symbol}\n")
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message(FATAL_ERROR "${symbol} is still defined in ${library}")
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endif()
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message(STATUS "Renamed ${symbol} to ${renamed} in ${library}")
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