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bazel warnings on mac #5145

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RussTedrake opened this issue Feb 12, 2017 · 2 comments
Closed

bazel warnings on mac #5145

RussTedrake opened this issue Feb 12, 2017 · 2 comments
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@david-german-tri
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component: distribution Nightly binaries, monthly releases, docker, installation configuration: bazel configuration: mac priority: low

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@RussTedrake
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fyi — building master w/ bazel on mac, I get spammed with e.g.

INFO: From Linking drake/systems/framework/libleaf_system.pic.a:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool: file: bazel-out/osx-opt/bin/drake/systems/framework/_objs/leaf_system/drake/systems/framework/leaf_system.pic.o has no symbols
warning: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool: warning for library: bazel-out/osx-opt/bin/drake/systems/framework/libleaf_system.pic.a the table of contents is empty (no object file members in the library define global symbols)
INFO: From Linking drake/systems/framework/libleaf_system.a:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool: file: bazel-out/osx-opt/bin/drake/systems/framework/_objs/leaf_system/drake/systems/framework/leaf_system.o has no symbols
warning: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool: warning for library: bazel-out/osx-opt/bin/drake/systems/framework/libleaf_system.a the table of contents is empty (no object file members in the library define global symbols)
@david-german-tri
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Yeah, I've noticed this too, on all our header-only targets. Thanks for opening an issue. There's probably a linker flag we can specify in CROSSTOOL to silence it.

@jwnimmer-tri jwnimmer-tri mentioned this issue Feb 15, 2017
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@david-german-tri
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Closing as duplicate of #5183, which has some additional detail.

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component: distribution Nightly binaries, monthly releases, docker, installation configuration: bazel configuration: mac priority: low
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@RussTedrake @david-german-tri