Compile Error on macOS High Sierra when lib idn2 is installed

[tobiasschweizer]

I had the following problem when compiling Sipi (develop):

[ 54%] Linking CXX executable sipi
Undefined symbols for architecture x86_64:
  "_idn2_check_version", referenced from:
      _fix_hostname in libcurl.a(libcurl_la-url.o)
      _curl_version in libcurl.a(libcurl_la-version.o)
      _curl_version_info in libcurl.a(libcurl_la-version.o)
  "_idn2_free", referenced from:
      _Curl_disconnect in libcurl.a(libcurl_la-url.o)
      _create_conn in libcurl.a(libcurl_la-url.o)
  "_idn2_lookup_ul", referenced from:
      _fix_hostname in libcurl.a(libcurl_la-url.o)
  "_idn2_strerror", referenced from:
      _fix_hostname in libcurl.a(libcurl_la-url.o)
ld: symbol(s) not found for architecture x86_64

It turned out that my local/lib/libcurl.la looked like this (see build/CMakeFiles/sipi.dir/link.txt for the linking command):

# Libraries that this one depends upon.
dependency_libs=' -L/usr/local/Cellar/openssl/1.0.2o_1/lib -L/usr/local/Cellar/libidn2/2.0.4/lib -lidn2 -lssl -lcrypto -lz'

On my laptop (same OS version, same version of clang) the compilation worked fine and -L/usr/local/Cellar/libidn2/2.0.4/lib -lidn2 was not added as a dependency since it was not even installed.

Steps to resolve my problem:

• brew remove wget (depends on libidn2)
• brew remove libidn2

I even have wget installed on my laptop (but without libidn2).

I do not know why this dependency was added in local/lib/libcurl.la for curl. It does not seem correct to me when wget depends on it.

However, all works now and tests pass. I made this issue in case someone has the same problem.

[tobiasschweizer]

I also had discovered that two versions of clang exist on my iMac:

• /Library/Developer/CommandLineTools/usr/bin/c++
• /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++

First, the one from /Library/Developer was used.

xcode-select --reset sets the settings to default which is /Applications/Xcode.app.

[tobiasschweizer]

This is the working setup:

macOS High Sierra 10.13.5

$ clang -v
Apple LLVM version 9.1.0 (clang-902.0.39.2)
Target: x86_64-apple-darwin17.6.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

[tobiasschweizer]

Should curl package maintainers enable libidn2 by default or no?

https://curl.haxx.se/mail/lib-2017-10/0157.html

[subotic]

Cool, thanks. I have the same issue, and it solved it.

[ezbinden]

For me it seems to be a different cause. My output is the following:

[ 54%] Linking CXX executable sipi Undefined symbols for architecture x86_64: "_BrotliDecoderCreateInstance", referenced from: _brotli_init_writer in libcurl.a(libcurl_la-content_encoding.o) "_BrotliDecoderDecompressStream", referenced from: _brotli_unencode_write in libcurl.a(libcurl_la-content_encoding.o) "_BrotliDecoderDestroyInstance", referenced from: _brotli_unencode_write in libcurl.a(libcurl_la-content_encoding.o) _brotli_close_writer in libcurl.a(libcurl_la-content_encoding.o) "_BrotliDecoderGetErrorCode", referenced from: _brotli_unencode_write in libcurl.a(libcurl_la-content_encoding.o) "_BrotliDecoderVersion", referenced from: _curl_version_info in libcurl.a(libcurl_la-version.o) _brotli_version in libcurl.a(libcurl_la-version.o) "_idn2_check_version", referenced from: _fix_hostname in libcurl.a(libcurl_la-url.o) _curl_version in libcurl.a(libcurl_la-version.o) _curl_version_info in libcurl.a(libcurl_la-version.o) "_idn2_free", referenced from: _Curl_disconnect in libcurl.a(libcurl_la-url.o) _create_conn in libcurl.a(libcurl_la-url.o) "_idn2_lookup_ul", referenced from: _fix_hostname in libcurl.a(libcurl_la-url.o) "_idn2_strerror", referenced from: _fix_hostname in libcurl.a(libcurl_la-url.o) ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) make[2]: *** [sipi] Error 1 make[1]: *** [CMakeFiles/sipi.dir/all] Error 2 make: *** [all] Error 2

I did not have wget installed, neither libidn2. Removing curl did not help either.

My setup is: macOS Mojave 10.14.2

clang -v Apple LLVM version 10.0.0 (clang-1000.11.45.5) Target: x86_64-apple-darwin18.2.0 Thread model: posix InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

Any ideas? Cheers, E

[lrosenth]

Seems to be a problem with libcurl - missing library... Will have a look at it...

Lukas

Am 15.12.2018 um 17:45 schrieb ez <[email protected]mailto:[email protected]>:

For me it seems to be a different cause. My output is the following:

[ 54%] Linking CXX executable sipi Undefined symbols for architecture x86_64: "_BrotliDecoderCreateInstance", referenced from: _brotli_init_writer in libcurl.a(libcurl_la-content_encoding.o) "_BrotliDecoderDecompressStream", referenced from: _brotli_unencode_write in libcurl.a(libcurl_la-content_encoding.o) "_BrotliDecoderDestroyInstance", referenced from: _brotli_unencode_write in libcurl.a(libcurl_la-content_encoding.o) _brotli_close_writer in libcurl.a(libcurl_la-content_encoding.o) "_BrotliDecoderGetErrorCode", referenced from: _brotli_unencode_write in libcurl.a(libcurl_la-content_encoding.o) "_BrotliDecoderVersion", referenced from: _curl_version_info in libcurl.a(libcurl_la-version.o) _brotli_version in libcurl.a(libcurl_la-version.o) "_idn2_check_version", referenced from: _fix_hostname in libcurl.a(libcurl_la-url.o) _curl_version in libcurl.a(libcurl_la-version.o) _curl_version_info in libcurl.a(libcurl_la-version.o) "_idn2_free", referenced from: _Curl_disconnect in libcurl.a(libcurl_la-url.o) _create_conn in libcurl.a(libcurl_la-url.o) "_idn2_lookup_ul", referenced from: _fix_hostname in libcurl.a(libcurl_la-url.o) "_idn2_strerror", referenced from: _fix_hostname in libcurl.a(libcurl_la-url.o) ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) make[2]: *** [sipi] Error 1 make[1]: *** [CMakeFiles/sipi.dir/all] Error 2 make: *** [all] Error 2

I did not have wget installed, neither libidn2. Removing curl did not help either.

My setup is: macOS Mojave 10.14.2

clang -v Apple LLVM version 10.0.0 (clang-1000.11.45.5) Target: x86_64-apple-darwin18.2.0 Thread model: posix InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

Any ideas? Cheers, E

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