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<p class="MsoNormal">Hmm, I thought CMake did something more sensible with PRIVATE/INTERFACE/PUBLIC dependencies on static libraries, but now I’m not so sure…<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’m continuing to investigate more, but I’ll revert in the meantime.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black"><cbieneman@apple.com> on behalf of Chris Bieneman <beanz@apple.com><br>
<b>Date: </b>Friday, July 12, 2019 at 9:08 AM<br>
<b>To: </b>Shoaib Meenai <smeenai@fb.com><br>
<b>Cc: </b>Alex Bradbury <asb@lowrisc.org>, cfe-commits <cfe-commits@lists.llvm.org><br>
<b>Subject: </b>Re: r365825 - [clang-shlib] Fix clang-shlib for PRIVATE dependencies<o:p></o:p></span></p>
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<p class="MsoNormal">Ah! I see what is going on here. This is kinda a silliness of CMake. `PRIVATE` linkage for a static archive is silly, and shouldn't be possible. All link dependencies for static archives are really `INTERFACE` dependencies, and it looks
like CMake is doing something kinda silly instead of producing a reasonable error or warning like it probably should do.
<o:p></o:p></p>
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<p class="MsoNormal">For context, `PRIVATE` linkage in the context of that change would mean DirectoryWalker links something, but things that link DirectoryWalker don't. That just isn't possible with static archives, so they become interface dependencies (and
CMake seems to insert a generator expression to make that work).<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">In `llvm_add_library` we always use `PRIVATE` linkage for shared libraries, and `INTERFACE` for static, which does the right thing.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Unless there is a better reason than a new patch coming in, I think the right fix is to revert this back and expect the new patch to correct its linkage behavior.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">-Chris<o:p></o:p></p>
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<p class="MsoNormal">On Jul 12, 2019, at 8:53 AM, Shoaib Meenai <<a href="mailto:smeenai@fb.com">smeenai@fb.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">See<span class="apple-converted-space"> </span><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__reviews.llvm.org_D58418-231577670&d=DwMFAg&c=5VD0RTtNlTh3ycd41b3MUw&r=o3kDXzdBUE3ljQXKeTWOMw&m=BaInVCyhXHMyre_oyIEnYhuQC5zsW6p65QBgZLR7ujc&s=7bhRDMtKEyVqFDlMWzo361mQT2N8lcOt-YDh-XGjZok&e="><span style="color:purple">https://reviews.llvm.org/D58418#1577670</span></a>.
More generally it would appear for any static library with a PRIVATE dependency though.<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">I guess an alternative would be to use the LINK_LIBRARIES property (which should be free of generator expressions, I believe) to propagate dependencies instead of INTERFACE_LINK_LIBRARIES, and just assume that no one is gonna set an INTERFACE
dependency on a static library. (Supporting PRIVATE dependencies on a static library definitely seems more valuable than supporting INTERFACE dependencies.)<o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt">From:<span class="apple-converted-space"> </span></span></b><span style="font-size:12.0pt"><<a href="mailto:cbieneman@apple.com">cbieneman@apple.com</a>> on behalf of Chris Bieneman <<a href="mailto:beanz@apple.com">beanz@apple.com</a>><br>
<b>Date:<span class="apple-converted-space"> </span></b>Friday, July 12, 2019 at 8:49 AM<br>
<b>To:<span class="apple-converted-space"> </span></b>Shoaib Meenai <<a href="mailto:smeenai@fb.com">smeenai@fb.com</a>><br>
<b>Cc:<span class="apple-converted-space"> </span></b>Alex Bradbury <<a href="mailto:asb@lowrisc.org">asb@lowrisc.org</a>>, cfe-commits <<a href="mailto:cfe-commits@lists.llvm.org">cfe-commits@lists.llvm.org</a>><br>
<b>Subject:<span class="apple-converted-space"> </span></b>Re: r365825 - [clang-shlib] Fix clang-shlib for PRIVATE dependencies</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">One of the benefits of the object library approach for generating the clang dylib is that it was compatible with BUILD_SHARED_LIBS. We had lots of issues with libLLVM where people using BUILD_SHARED_LIBS would make changes that broke it,
so I was trying to make the clang dylib in a way that it could always be enabled.<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">Do we know where the nested generator expression was coming from?<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">-Chris<o:p></o:p></p>
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<p class="MsoNormal">On Jul 12, 2019, at 8:32 AM, Shoaib Meenai <<a href="mailto:smeenai@fb.com"><span style="color:purple">smeenai@fb.com</span></a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">Oops, sorry about the breakage.<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">Chris, aren't BUILD_SHARED_LIBS and the combined Clang dylib incompatible? Should we disable building the latter if the former is set?<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt">From:<span class="apple-converted-space"> </span></span></b><span style="font-size:12.0pt">Alex Bradbury <<a href="mailto:asb@lowrisc.org"><span style="color:purple">asb@lowrisc.org</span></a>><br>
<b>Date:<span class="apple-converted-space"> </span></b>Friday, July 12, 2019 at 2:02 AM<br>
<b>To:<span class="apple-converted-space"> </span></b>Shoaib Meenai <<a href="mailto:smeenai@fb.com"><span style="color:purple">smeenai@fb.com</span></a>><br>
<b>Cc:<span class="apple-converted-space"> </span></b>cfe-commits <<a href="mailto:cfe-commits@lists.llvm.org"><span style="color:purple">cfe-commits@lists.llvm.org</span></a>><br>
<b>Subject:<span class="apple-converted-space"> </span></b>Re: r365825 - [clang-shlib] Fix clang-shlib for PRIVATE dependencies</span><o:p></o:p></p>
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<p class="MsoNormal">On Thu, 11 Jul 2019 at 22:20, Shoaib Meenai via cfe-commits<o:p></o:p></p>
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<p class="MsoNormal"><<a href="mailto:cfe-commits@lists.llvm.org"><span style="color:purple">cfe-commits@lists.llvm.org</span></a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">Author: smeenai<o:p></o:p></p>
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<p class="MsoNormal">Date: Thu Jul 11 14:20:38 2019<o:p></o:p></p>
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<p class="MsoNormal">New Revision: 365825<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">URL:<span class="apple-converted-space"> </span><a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__llvm.org_viewvc_llvm-2Dproject-3Frev-3D365825-26view-3Drev&d=DwIBaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=o3kDXzdBUE3ljQXKeTWOMw&m=ETCU2JhfBcjWz-nbe6LUVSRQR0T1f3wCzxLIhKlMmQo&s=R9NSZG1XQDVSiE0wJUgb1kMUrG6bJkG3v5GDcTdkpAk&e="><span style="color:purple">https://urldefense.proofpoint.com/v2/url?u=http-3A__llvm.org_viewvc_llvm-2Dproject-3Frev-3D365825-26view-3Drev&d=DwIBaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=o3kDXzdBUE3ljQXKeTWOMw&m=ETCU2JhfBcjWz-nbe6LUVSRQR0T1f3wCzxLIhKlMmQo&s=R9NSZG1XQDVSiE0wJUgb1kMUrG6bJkG3v5GDcTdkpAk&e=</span></a><o:p></o:p></p>
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<p class="MsoNormal">Log:<o:p></o:p></p>
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<p class="MsoNormal">[clang-shlib] Fix clang-shlib for PRIVATE dependencies<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">Any static library with a PRIVATE dependency ends up with a<o:p></o:p></p>
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<p class="MsoNormal">$<LINK_ONLY:...> generator expression in its INTERFACE_LINK_LIBRARIES,<o:p></o:p></p>
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<p class="MsoNormal">which won't be evaluated by the $<TARGET_PROPERTY:...>, so we end up<o:p></o:p></p>
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<p class="MsoNormal">with an unevaluated generator expression in the generated build file and<o:p></o:p></p>
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<p class="MsoNormal">Ninja chokes on the dollar sign. Just use the static library directly<o:p></o:p></p>
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<p class="MsoNormal">for its dependencies instead of trying to propagate dependencies<o:p></o:p></p>
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<p class="MsoNormal">manually.<o:p></o:p></p>
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<p class="MsoNormal">Differential Revision:<span class="apple-converted-space"> </span><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__reviews.llvm.org_D64579&d=DwIBaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=o3kDXzdBUE3ljQXKeTWOMw&m=ETCU2JhfBcjWz-nbe6LUVSRQR0T1f3wCzxLIhKlMmQo&s=mutN2zF1KixMEVFjNzG_Q7iVJzG5ECbrU4tX3AKWLVQ&e="><span style="color:purple">https://urldefense.proofpoint.com/v2/url?u=https-3A__reviews.llvm.org_D64579&d=DwIBaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=o3kDXzdBUE3ljQXKeTWOMw&m=ETCU2JhfBcjWz-nbe6LUVSRQR0T1f3wCzxLIhKlMmQo&s=mutN2zF1KixMEVFjNzG_Q7iVJzG5ECbrU4tX3AKWLVQ&e=</span></a><o:p></o:p></p>
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<p class="MsoNormal">This seems to break a -DBUILD_SHARED_LIBS build for me. It fails at<o:p></o:p></p>
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<p class="MsoNormal">the point of linking lib/libclang_shared.so.9svn with errors like:<o:p></o:p></p>
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<p class="MsoNormal">ld.lld: error: undefined symbol: llvm::llvm_unreachable_internal(char<o:p></o:p></p>
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<p class="MsoNormal">const*, char const*, unsigned int)<o:p></o:p></p>
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<p class="MsoNormal">referenced by Attributes.cpp:34 (/home/asb/llvm-project/clang/lib/Basic/Attributes.cpp:34)<o:p></o:p></p>
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<p class="MsoNormal"> tools/clang/lib/Basic/CMakeFiles/obj.clangBasic.dir/Attributes.cpp.o:(clang::attr::getSubjectMatchRuleSpelling(clang::attr::SubjectMatchRule))<o:p></o:p></p>
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<p class="MsoNormal">referenced by TargetCXXABI.h:168 (/home/asb/llvm-project/clang/include/clang/Basic/TargetCXXABI.h:168)<o:p></o:p></p>
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<p class="MsoNormal"> tools/clang/lib/Basic/CMakeFiles/obj.clangBasic.dir/Attributes.cpp.o:(clang::TargetCXXABI::isMicrosoft() const)<o:p></o:p></p>
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<p class="MsoNormal">referenced by TargetCXXABI.h:149 (/home/asb/llvm-project/clang/include/clang/Basic/TargetCXXABI.h:149)<o:p></o:p></p>
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<p class="MsoNormal"> tools/clang/lib/Basic/CMakeFiles/obj.clangBasic.dir/Attributes.cpp.o:(clang::TargetCXXABI::isItaniumFamily() const)<o:p></o:p></p>
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<p class="MsoNormal">referenced by Attributes.cpp<o:p></o:p></p>
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<p class="MsoNormal"> tools/clang/lib/Basic/CMakeFiles/obj.clangBasic.dir/Attributes.cpp.o:(llvm::VerifyEnableABIBreakingChecks)<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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