[LLVMdev] [Clang] [lld] [llvm-link] Whole program (original) (raw)

[LLVMdev] [Clang] [lld] [llvm-link] Whole program / dead-code optimization

Nick Lewycky nicholas at mxc.ca
Thu Jul 16 23:15:37 PDT 2015

ed at modk.it wrote:

Is there a reason why LLVM's link-time optimization won't work for you? http://llvm.org/docs/GoldPlugin.html <https://urldefense.proofpoint.com/v2/url?u=http-3A_llvm.orgdocsGoldPlugin.html&d=AwMFaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=Mfk2qtn1LTDThVkh6-oGglNfMADXfJdty4bhmuhMHA&m=rF94h73bKDdWVhxOWqRXpvw5pSMgvuHQXJ_qw8n2LU&s=PR31BXeMANGrAQP2Tt9Eg5psH82vj8Oq1WmyprGhyn8&e=> http://llvm.org/docs/LinkTimeOptimization.html <https://urldefense.proofpoint.com/v2/url?u=http-3A_llvm.orgdocsLinkTimeOptimization.html&d=AwMFaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=Mfk2qtn1LTDThVkh6-oGglNfMADXfJdty4bhmuhMHA&m=rF94h73bKDdWVhxOWqRXpvw5pSMgvuHQXJ_qw8n2LU&s=PoqmeRXrssdG9xj6FkoSKttwLPWqUVkxFH41dOcg4w&e=>

Well the primary motivation to move to LLVM is licensing which is why we also ditched binutils since we can't package gcc for iOS due to the GPL. So in the end the gold plugin wouldn't work for licensing reasons even if we can get it to work technically but thanks for the links I'm still trying to wrap my head around the problem and any info helps.

The right future is a world where lld performs llvm lto for you.

Until then, the technique in Gao's PDF is what I would recommend.

Nick

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