151559 2015-11-23 02:41:01 -0800 [CMake] Do not use LLVM static libraries for FTL JIT 2016-01-26 07:04:47 -0800 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build PC Linux RESOLVED FIXED P3 Blocker --- 153484 143605 1 guillaume.webkit webkit-unassigned achristensen bugs-noreply cgarcia fpizlo gyuyoung.kim jeremyhu mcatanzaro mrobinson ossy tpopela oldest_to_newest 1144146 0 guillaume.webkit 2015-11-23 02:41:01 -0800 When I'm trying to compile WebkitGTK 2.11.2, I get: > No rule to make target '/usr/lib64/libLLVMSupport.a', needed by 'DerivedSources/JavaScriptCore/WebKitLLVMLibraryToken.h'. I can build WebkitGTK 2.11.1 successfully with the same configuration flags. 1144179 1 mcatanzaro 2015-11-23 07:28:18 -0800 It's because we turned on FTL JIT. You need to either install LLVM on your system, including LLVM static libraries (the llvm-static package on Fedora), or run cmake with -DENABLE_FTL_JIT=OFF. But this is also a bug in our CMake build system. You should have gotten a nice error message when running CMake. Currently our build system is smart enough to check that you have LLVM itself installed, but we additionally depend on those static libraries, and while we check for those separately, we don't error out properly if they're missing. 1144188 2 mcatanzaro 2015-11-23 10:22:04 -0800 Also, we need to determine if there is a good reason for depending on LLVM static libs. Gentoo does not ship these at all. We ship them in Fedora, but in a separate llvm-static package. We're only allowed to link Fedora packages to static libraries in "exceptional circumstances," and to my knowledge we do not have one here. Hey Filip, do you know why we are linking with LLVM static libs instead of a proper shared library? 1144189 3 ossy 2015-11-23 10:26:02 -0800 (In reply to comment #2) > Also, we need to determine if there is a good reason for depending on LLVM > static libs. Gentoo does not ship these at all. We ship them in Fedora, but > in a separate llvm-static package. We're only allowed to link Fedora > packages to static libraries in "exceptional circumstances," and to my > knowledge we do not have one here. > > Hey Filip, do you know why we are linking with LLVM static libs instead of a > proper shared library? https://trac.webkit.org/changeset/157260 answers the question why. ( https://bugs.webkit.org/show_bug.cgi?id=142128#c18 ) 1144201 4 mcatanzaro 2015-11-23 11:22:22 -0800 That explains why we need to load a shared library with dlopen (libllvmForJSC.so) instead of linking to LLVM normally. That's unconventional but fine. Now, libllvmForJSC.so is linked statically to LLVM, which is not generally permitted in Fedora. I want to know why we don't dynamically link libllvmForJSC.so to the system LLVM. Surely we can override cxa_atexit regardless, so I don't think we need to link statically. 1151495 5 mcatanzaro 2015-12-28 16:40:22 -0800 OK, my vote is to either fix this or disable FTL again before 2.12. Using static libs is not considered acceptable on Linux, and it's causing build problems for openSUSE and Gentoo, which don't have LLVM static libs at all; no doubt it will be problematic for other distros too. openSUSE came up with a rather innovative solution [1] to use -DLLVM_CONFIG_EXE at cmake time to pointing cmake to a script that wraps llvm-config like so: #!/bin/bash /usr/bin/llvm-config $1 |sed "s,\\.a,\\.so,g" Yuck, but their package is reportedly working without issues, so I doubt the static libs were ever really needed. It would be better to use a similar wrapper around llvm-config to handle this automagically than to continue using static libs. [1] https://build.opensuse.org/package/rdiff/GNOME:Next/webkit2gtk3?opackage=webkit2gtk3&oproject=GNOME:Factory&rev=87 1155055 6 cgarcia 2016-01-13 03:23:18 -0800 (In reply to comment #5) > OK, my vote is to either fix this or disable FTL again before 2.12. Using > static libs is not considered acceptable on Linux, and it's causing build > problems for openSUSE and Gentoo, which don't have LLVM static libs at all; > no doubt it will be problematic for other distros too. > > openSUSE came up with a rather innovative solution [1] to use > -DLLVM_CONFIG_EXE at cmake time to pointing cmake to a script that wraps > llvm-config like so: > > #!/bin/bash > > /usr/bin/llvm-config $1 |sed "s,\\.a,\\.so,g" > > Yuck, but their package is reportedly working without issues, so I doubt the > static libs were ever really needed. It would be better to use a similar > wrapper around llvm-config to handle this automagically than to continue > using static libs. It's not that easy, this hack works for SUSE because they are building llvm with CMake, so they have a .so for each static library. However, if llvm is built using autotools (like debian and fedora do) what we have is a single .so file. So we need to detect this as well at configure. 1155056 7 268863 cgarcia 2016-01-13 03:29:03 -0800 Created attachment 268863 Patch I've tested this in debian, having both the global .so and the individual .a files installed, and it uses the global .so. It would be great if someone could test this in other distros, fedora, gentoo and suse at least. It first checks if there's a global .so, and if it isn't it uses the libs information from llvm-config instead of the lib files, so that in case of having both the .so and .a files for the individual libs, it will still prefer the .so ones, and if only .a files are installed, it will use those. 1155075 8 268863 mcatanzaro 2016-01-13 07:37:31 -0800 Comment on attachment 268863 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=268863&action=review Thanks for working on this. I will test in on my Fedora box and on openSUSE OBS. > Source/cmake/FindLLVM.cmake:33 > +# We need to build the soname manually in any case, since there's no way to get it from llvm-config. There's currently no way to get it from llvm-config. I've heard this might be possible with LLVM 3.8. 1155127 9 mcatanzaro 2016-01-13 10:46:03 -0800 It builds and runs fine on Fedora. It also builds fine on openSUSE. 1155381 10 cgarcia 2016-01-13 23:34:31 -0800 Committed r195009: <http://trac.webkit.org/changeset/195009> 1156261 11 jeremyhu 2016-01-16 21:37:23 -0800 This doesn't work on Windows or OSX, and it doesn't work for current development versions of llvm (on any platform). Followup in bug #153191. 268863 2016-01-13 03:29:03 -0800 2016-01-13 07:37:31 -0800 Patch jsc-llvm-linking.diff text/plain 7442 cgarcia ZGlmZiAtLWdpdCBhL0NoYW5nZUxvZyBiL0NoYW5nZUxvZwppbmRleCAzYzgwNzExLi40MGRhNTI5 IDEwMDY0NAotLS0gYS9DaGFuZ2VMb2cKKysrIGIvQ2hhbmdlTG9nCkBAIC0xLDMgKzEsMTUgQEAK KzIwMTYtMDEtMTMgIENhcmxvcyBHYXJjaWEgQ2FtcG9zICA8Y2dhcmNpYUBpZ2FsaWEuY29tPgor CisgICAgICAgIFtDTWFrZV0gRG8gbm90IHVzZSBMTFZNIHN0YXRpYyBsaWJyYXJpZXMgZm9yIEZU TCBKSVQKKyAgICAgICAgaHR0cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTE1 MTU1OQorCisgICAgICAgIFJldmlld2VkIGJ5IE5PQk9EWSAoT09QUyEpLgorCisgICAgICAgIEFs c28gZXhwb3J0IExMVk1fTElCUkFSSUVTIHZhcmlhYmxlIHRoYXQgY2FuIGJlIHVzZWQgdG8gcHJl ZmVyCisgICAgICAgIGxpbmtpbmcgdG8gdGhlIGxsdm0gZHluYW1pYyBsaWJyYXJpZXMuCisKKyAg ICAgICAgKiBTb3VyY2UvY21ha2UvRmluZExMVk0uY21ha2U6CisKIDIwMTYtMDEtMTIgIENhcmxv cyBHYXJjaWEgQ2FtcG9zICA8Y2dhcmNpYUBpZ2FsaWEuY29tPgogCiAgICAgICAgIFVucmV2aWV3 ZWQuIFVwZGF0ZSBPcHRpb25zR1RLLmNtYWtlIGFuZCBORVdTIGZvciAyLjExLjMgcmVsZWFzZS4K 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