[MacPorts] #43828: clang-3.4 package uses mismatched libc++ headers and libraries

26 May 2014

      #43828: clang-3.4 package uses mismatched libc++ headers and libraries
-----------------------------------+--------------------------------
 Reporter:  howarth.at.macports@…  |      Owner:  macports-tickets@…
     Type:  defect                 |     Status:  new
 Priority:  Normal                 |  Milestone:
Component:  ports                  |    Version:  2.3.0
 Keywords:  lang                   |       Port:  clang-3.4
-----------------------------------+--------------------------------
 On 10.7, I noticed that the MacPort's clang++-mp-3.4 compiler from the
 clang-3.4 package is using a mismatched set of libc++ headers and
 libraries…

 {{{
 % clang++-mp-3.4 -stdlib=libc++ hello.cc -v
 clang version 3.4 (tags/RELEASE_34/final)
 Target: x86_64-apple-darwin11.4.2
 Thread model: posix
  "/opt/local/libexec/llvm-3.4/bin/clang" -cc1 -triple x86_64-apple-
 macosx10.7.0 -emit-obj -mrelax-all -disable-free -main-file-name hello.cc
 -mrelocation-model pic -pic-level 2 -mdisable-fp-elim -masm-verbose
 -munwind-tables -target-cpu core2 -target-linker-version 136 -v -resource-
 dir /opt/local/libexec/llvm-3.4/bin/../lib/clang/3.4 -stdlib=libc++
 -fdeprecated-macro -fdebug-compilation-dir /Users/howarth -ferror-limit 19
 -fmessage-length 125 -stack-protector 1 -mstackrealign -fblocks -fobjc-
 runtime=macosx-10.7.0 -fencode-extended-block-signature -fcxx-exceptions
 -fexceptions -fdiagnostics-show-option -fcolor-diagnostics -vectorize-slp
 -o /var/folders/b8/ybr6czsd73s1qds_6bh5v0v80000gn/T/hello-8467e9.o -x c++
 hello.cc
 clang -cc1 version 3.4 based upon LLVM 3.4 default target x86_64-apple-
 darwin11.4.2
 ignoring nonexistent directory "/usr/include/c++/v1"
 ignoring nonexistent directory "/usr/local/include"
 #include "..." search starts here:
 #include <...> search starts here:
  /opt/local/libexec/llvm-3.4/bin/../include/c++/v1
  /opt/local/libexec/llvm-3.4/bin/../lib/clang/3.4/include
  /usr/include
  /System/Library/Frameworks (framework directory)
  /Library/Frameworks (framework directory)
 End of search list.
  "/opt/local/libexec/llvm-3.4/bin/ld" -demangle -dynamic -arch x86_64
 -macosx_version_min 10.7.0 -o a.out -lcrt1.10.6.o
 /var/folders/b8/ybr6czsd73s1qds_6bh5v0v80000gn/T/hello-8467e9.o -lc++
 -lSystem
 /opt/local/libexec/llvm-3.4/bin/../lib/clang/3.4/lib/darwin/libclang_rt.osx.a

 % otool -L ./a.out
 ./a.out:
         /usr/lib/libc++.1.dylib (compatibility version 1.0.0, current
 version 28.4.0)
         /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current
 version 159.1.0)

 So the newer libc++ 3.4.1 headers stored in
 /opt/local/libexec/llvm-3.4/include are being used the much older system
 libc++…

 % otool -L /usr/lib/libc++.1.dylib
 /usr/lib/libc++.1.dylib:
         /usr/lib/libc++.1.dylib (compatibility version 1.0.0, current
 version 28.4.0)
         /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current
 version 159.1.0)
         /usr/lib/libc++abi.dylib (compatibility version 1.0.0, current
 version 14.0.0)
 }}}

 We fixed this on fink by adding…

 {{{
         # Adjust path for relocation of libc++ headers
         if test "$darwin_vers" -ge 13
                 then sed -i.orig2 -e
 's|AddPath("/usr/include/c++/v1"|AddPath("/Library/Developer/CommandLineTools/usr/lib/c++/v1"|'
 \
                         tools/clang/lib/Frontend/InitHeaderSearch.cpp
         elif test "$darwin_vers" -ge 11
                 then sed -i.orig2 -e
 's|AddPath("/usr/include/c++/v1"|AddPath("/usr/lib/c++/v1"|' \
                         tools/clang/lib/Frontend/InitHeaderSearch.cpp
         fi
 }}}

 so clang-3.4 in MacPorts needs something like…

 {{{
 if {${os.major} > 12} {
     post-patch {
       reinplace
 "s|AddPath(\"/usr/include/c++/v1\"|AddPath(\"/Library/Developer/CommandLineTools/usr/lib/c++/v1\"|"
 ${worksrcpath}/tools/clang/lib/Frontend/InitHeaderSearch.cpp
     }
 elseif {${os.major} > 10} {
     post-patch {
       reinplace
 "s|AddPath(\"/usr/include/c++/v1\"|AddPath(\"/usr/lib/c++/v1\"|"
 ${worksrcpath}/tools/clang/lib/Frontend/InitHeaderSearch.cpp
    }
 }
 }}}

 As you can see from the verbose output of clang-3.4 at the beginning of
 this report…

 ignoring nonexistent directory "/usr/include/c++/v1"

 …the stock sources default to a /usr/include/c++/v1 directory which Apple
 has never used instead of /usr/lib/c++/v1 on 10.7/10.8 and
 /Library/Developer/CommandLineTools/usr/lib/c++/v1 on 10.9.

-- 
Ticket URL: <https://trac.macports.org/ticket/43828>
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