[SR-235] The package manager fails to link C static libraries #5439
Comments
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I've PRed a workaround for this issue, #107. If that PR is merged, we can say extraLinkerOptions: ["-Lpath/to/folder", "-lcfcgi"] to work around this bug. |
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So this doesn't work even though the library path is: /usr/local/lib/libcfgi.a? |
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Comment by Valentin Radu (JIRA) Yes, that is correct. It does work if the library is dynamic, in the same location: `/usr/local/lib/libcfgi.dylib` |
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Comment by James Richard (JIRA) I had a similar problem where the .a file was targeted for Mac OS, but the build system was Linux, so it couldn't find the symbols. Could your .a have been built improperly, such as that, or only with 32bit support? |
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Comment by Valentin Radu (JIRA) Yes, the lib was properly built. I had the exact same lib linked manually with clang in C and it worked. |
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Comment by Dr. Kibitz (JIRA) I had a similar issue while trying to link against libgit2, which was installed in '/usr/local/lib'. After some fighting, I finally landed on this issue and landed on doing this: swift build -v -Xlinker -L/usr/local/lib Some more info is when I was inspecting the output of `swift build -v`. I noticed that it was specifying '-sdk' as '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk' Just for testing, I tried this: ln -s /usr/local/lib/libgit2.dylib /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk/usr/lib With that, just plain ol' `swift build -v` works. I really think `/usr/local` should be a default, and wonder why it's not. |
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Comment by Valentin Radu (JIRA) @mxcl This is fixed in swift-DEVELOPMENT-SNAPSHOT-2016-03-24. Should I close it, or needs to be tested by you guys? |
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I'll verify. Thanks. |
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If this is verified as fixed by the originator, then it can be closed. Sending back as resolved. |
Environment
OS: OSX El Capitan
Toolchain: swift-2.2-SNAPSHOT-2015-12-01-a
Additional Detail from JIRA
md5: 9e4f456ddc0b50ca3c704f851d707f05
Issue Description:
Out of the box, with no tweaks or workarounds, trying to link a C system module pointing to a static library fails. It works fine when the same library is dynamic.
An example module map:
module CFCGI [system] {
header "/usr/local/include/cfcgi/cfcgi.h"
link "cfcgi"
export *
}
And the output:
swift build --clean && swift build -v
Cloning into '/Users/valentinradu/Playgrounds/April/Packages/libcfcgi'...
warning: --depth is ignored in local clones; use file:// instead.
done.
/Library/Developer/Toolchains/swift-2.2-SNAPSHOT-2015-12-01-a.xctoolchain/usr/bin/swiftc -module-name April -incremental -emit-dependencies -emit-module -emit-module-path /Users/valentinradu/Playgrounds/April/.build/debug/April.swiftmodule -output-file-map /Users/valentinradu/Playgrounds/April/.build/debug/April.o/April/output-file-map.json -c /Users/valentinradu/Playgrounds/April/Sources/main.swift -I /Users/valentinradu/Playgrounds/April/.build/debug -j8 -Onone -g -target x86_64-apple-macosx10.10 -sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk -Xcc -F-module-map=/Users/valentinradu/Playgrounds/April/Packages/libcfcgi-1.0.0/module.modulemap -I /Users/valentinradu/Playgrounds/April/Packages/libcfcgi-1.0.0 -I /usr/local/include
/Library/Developer/Toolchains/swift-2.2-SNAPSHOT-2015-12-01-a.xctoolchain/usr/bin/swiftc -o /Users/valentinradu/Playgrounds/April/.build/debug/April /Users/valentinradu/Playgrounds/April/.build/debug/April.o/Sources/main.swift.o -Xlinker -all_load -target x86_64-apple-macosx10.10 -sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk -L/usr/local/lib
Undefined symbols for architecture x86_64:
"_cfcgi_create", referenced from:
_main in main.swift.o
"_cfcgi_free", referenced from:
_main in main.swift.o
"_cfcgi_start_and_wait", referenced from:
_main in main.swift.o
ld: symbol(s) not found for architecture x86_64
<unknown>:0: error: build had 1 command failures
swift-build: exit(1): ["/Library/Developer/Toolchains/swift-2.2-SNAPSHOT-2015-12-01-a.xctoolchain/usr/bin/swift-build-tool", "-v", "-f", "/Users/valentinradu/Playgrounds/April/.build/debug/April.o/llbuild.yaml"]
It looks like the linker ignores the `link cfcgi` part.
Additional info:
libcfcgi.a is in /usr/local/lib and it’s compiled for x86_64
libcfcgi.a contains the above mentioned symbols, tested it with nm and linked it in a small C program: it works.
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