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Merge pull request #4320 from kinke/dead_strip

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Be less conservative wrt. linker dead code elimination
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Martin Kinkelin 2023-02-22 16:10:19 +01:00 • committed by GitHub
commit aa9b2783bb
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6 changed files with 66 additions and 50 deletions
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16
driver/targetmachine.cpp
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@ -505,14 +505,14 @@ createTargetMachine(const std::string targetTriple, const std::string arch,
break;
}
// Right now, we only support linker-level dead code elimination on Linux
// and FreeBSD using GNU or LLD linkers (based on the --gc-sections flag).
// The Apple ld on OS X supports a similar flag (-dead_strip) that doesn't
// require emitting the symbols into different sections. The MinGW ld doesn't
// seem to support --gc-sections at all.
if (!noLinkerStripDead && (triple.getOS() == llvm::Triple::Linux ||
triple.getOS() == llvm::Triple::FreeBSD ||
triple.getOS() == llvm::Triple::Win32)) {
// Linker-level dead code elimination for ELF/wasm binaries using GNU or LLD
// linkers (based on the --gc-sections flag) requires a separate section per
// symbol.
// The Apple ld64 on macOS supports a similar flag (-dead_strip) that doesn't
// require emitting the symbols into different sections.
// On Windows, the MSVC link.exe / lld-link.exe has `/REF`; LLD enforces
// separate sections with LTO, so do the same here.
if (!noLinkerStripDead && !triple.isOSBinFormatMachO()) {
targetOptions.FunctionSections = true;
targetOptions.DataSections = true;
}