clang:错误:未知参数:来自macos上libtool的'-n‘

Question

/Applications/Xcode.app/Contents/Developer/usr/bin/make  all-am                                                                          
/bin/sh ./libtool  --tag=CXX   --mode=link /Applications/Xcode.app/Contents/Developer/usr/bin/g++  -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -I/Users/unhammer/src/macdivvun-service/Dependencies
/Static/x86_64/include -fvisibility=hidden -std=c++1z  -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -L/Users/unhammer/src/macdivvun-service/Dependencies/Static/x86_64/lib -o hfst-ospell main.o lib
hfstospell.la -n  -L/usr/local/lib -licui18n -licuuc -licudata                                                                           
libtool: link: /Applications/Xcode.app/Contents/Developer/usr/bin/g++ -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -I/Users/unhammer/src/macdivvun-service/Dependencies/Static/x86_64/include -fvisi
bility=hidden -std=c++1z -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -o hfst-ospell main.o -n -Wl,-bind_at_load  -L/Users/unhammer/src/macdivvun-service/Dependencies/Static/x86_64/lib ./.libs/lib
hfstospell.a -L/usr/local/lib -licui18n -licuuc -licudata                                                                                
clang: error: unknown argument: '-n'                                                                                                     
make[1]: *** [hfst-ospell] Error 1                                                                                                       
make: *** [all] Error 2      

这个-n是从哪里来的？我怎么才能知道呢？我使用的是xcodebuild，但是xcodebuild -showBuildSettings -scheme Dependencies|grep -e -n没有提供任何东西，而且在实际的(autotools)项目中，我在Makefile.am或configure.ac的任何标志中都没有看到-n。

Answer 1

我从$(AM_V_CXXLD)$(hfst_ospell_LINK) $(hfst_ospell_OBJECTS) $(hfst_ospell_LDADD) $(LIBS)行开始，查看了在生成的Makefile中构建的实际目标，并递归地手动检查了那里的所有变量。最后，我看到LIBS有-n -L/usr/local/lib -licui18n -licuuc -licudata。LIBS是Makefile.in中的LIBS = @LIBS@，所以由configure.ac设置，它运行icu-config --ldflags来设置它。

由于某些原因，我给了-n -L/usr/local/lib -licui18n -licuuc -licudata而不是-L/usr/local/lib -licui18n -licuuc -licudata的icu-config --ldflags版本(57.1)。升级icu解决了这个问题。