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54 lines
1.9 KiB
CMake
54 lines
1.9 KiB
CMake
#[===================================================================[
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Patch executables to run in non-Nix environments.
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The Nix-based CI image links binaries against an ELF interpreter (loader)
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that lives in the Nix store, so the resulting binaries don't run elsewhere
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(including once installed from the .deb package). `patch_nix_binary` adds a
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POST_BUILD step that resets the interpreter to the system default loader and
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drops the rpath.
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This is only active inside the Nix-based image, detected by the presence of
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/tmp/loader-path.sh (shipped by that image, resolves the default loader). It
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is skipped for sanitizer builds, whose runtime libraries are resolved through
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the rpath. Everywhere else `patch_nix_binary` is a no-op.
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#]===================================================================]
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include_guard(GLOBAL)
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include(CompilationEnv)
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# Provided by the Nix-based CI image; prints the system default ELF loader path.
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set(_loader_path_script "/tmp/loader-path.sh")
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if(is_linux AND NOT SANITIZERS_ENABLED AND EXISTS "${_loader_path_script}")
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execute_process(
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COMMAND "${_loader_path_script}"
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OUTPUT_VARIABLE DEFAULT_LOADER_PATH
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OUTPUT_STRIP_TRAILING_WHITESPACE
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COMMAND_ERROR_IS_FATAL ANY
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)
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find_program(PATCHELF_COMMAND patchelf REQUIRED)
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set(PATCH_NIX_BINARIES TRUE)
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message(
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STATUS
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"Binaries will be patched to use loader '${DEFAULT_LOADER_PATH}'"
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)
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else()
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set(PATCH_NIX_BINARIES FALSE)
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endif()
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function(patch_nix_binary target)
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if(NOT PATCH_NIX_BINARIES)
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return()
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endif()
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add_custom_command(
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TARGET ${target}
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POST_BUILD
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COMMAND
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"${PATCHELF_COMMAND}" --set-interpreter "${DEFAULT_LOADER_PATH}"
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--remove-rpath "$<TARGET_FILE:${target}>"
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COMMENT "Patching ${target}: set default loader, remove rpath"
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VERBATIM
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)
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endfunction()
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