[MacPorts] #55592: libunwind @5.0.1: unrecognized command line option '-stdlib=libstdc++' with clang-3.4

MacPorts noreply at macports.org
Wed Dec 27 20:38:11 UTC 2017


#55592: libunwind @5.0.1: unrecognized command line option '-stdlib=libstdc++' with
clang-3.4
---------------------------+----------------------
  Reporter:  sideeffect42  |      Owner:  jeremyhu
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.4.2
Resolution:                |   Keywords:
      Port:  libunwind     |
---------------------------+----------------------

Comment (by sideeffect42):

 I do agree that clang is a bad choice on PowerPC. So many ports that just
 don't compile properly with clang.

 Does anyone know more about how clang works internally?
 I just set up this little test to figure out what's going on and it looks
 like clang is just a wrapper for GCC:

 hello.cxx:
 {{{
 #include <cstdio>

 int main() {
         printf("Hello World\n");
 }
 }}}

 {{{
 $ clang++-mp-3.4 -v -stdlib=libstdc++ hello.cxx
 clang version 3.4.2 (tags/RELEASE_34/dot2-final)
 Target: powerpc-apple-darwin9.8.0
 Thread model: posix
 Selected GCC installation:
  "/opt/local/libexec/llvm-3.4/bin/clang" -cc1 -triple powerpc-apple-
 darwin9.8.0 -S -disable-free -disable-llvm-verifier -main-file-name
 hello.cxx -mrelocation-model static -mdisable-fp-elim -fmath-errno
 -target-linker-version 127.2 -v -resource-dir
 /opt/local/libexec/llvm-3.4/bin/../lib/clang/3.4.2 -stdlib=libstdc++
 -fdeprecated-macro -fno-dwarf2-cfi-asm -fno-dwarf-directory-asm -fno-
 autolink -fdebug-compilation-dir /tmp -ferror-limit 19 -fmessage-length
 115 -mstackrealign -fobjc-runtime=gcc -fcxx-exceptions -fexceptions
 -fdiagnostics-show-option -fcolor-diagnostics -vectorize-slp -o
 /var/folders/+n/+nOIyIexGQyIeCv9kUV2mU+++TI/-Tmp-/hello-b09da6.s -x c++
 hello.cxx
 clang -cc1 version 3.4.2 based upon LLVM 3.4.2 default target powerpc-
 apple-darwin9.8.0
 ignoring nonexistent directory "/usr/include/c++/4.2.1"
 ignoring nonexistent directory "/usr/include/c++/4.2.1/powerpc-apple-
 darwin10/"
 ignoring nonexistent directory "/usr/include/c++/4.2.1/backward"
 #include "..." search starts here:
 #include <...> search starts here:
  /usr/include/c++/4.0.0
  /usr/include/c++/4.0.0/powerpc-apple-darwin8
  /usr/include/c++/4.0.0/backward
  /usr/local/include
  /opt/local/libexec/llvm-3.4/bin/../lib/clang/3.4.2/include
  /usr/include
  /System/Library/Frameworks (framework directory)
  /Library/Frameworks (framework directory)
 End of search list.
  "/opt/local/bin/g++" -v -stdlib=libstdc++ -c -arch ppc -m32 -o
 /var/folders/+n/+nOIyIexGQyIeCv9kUV2mU+++TI/-Tmp-/hello-6a3a66.o -x
 assembler /var/folders/+n/+nOIyIexGQyIeCv9kUV2mU+++TI/-Tmp-/hello-b09da6.s
 Using built-in specs.
 COLLECT_GCC=/opt/local/bin/g++
 g++: error: unrecognized command line option '-stdlib=libstdc++'; did you
 mean '-static-libstdc++'?
 Target: ppc-apple-darwin9
 Configured with:
 /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_lang_gcc7/gcc7/work/gcc-7.2.0/configure
 --prefix=/opt/local --build=ppc-apple-darwin9 --enable-
 languages=c,c++,objc,obj-c++,lto,fortran --libdir=/opt/local/lib/gcc7
 --includedir=/opt/local/include/gcc7 --infodir=/opt/local/share/info
 --mandir=/opt/local/share/man --datarootdir=/opt/local/share/gcc-7 --with-
 local-prefix=/opt/local --with-system-zlib --disable-nls --program-
 suffix=-mp-7 --with-gxx-include-dir=/opt/local/include/gcc7/c++/ --with-
 gmp=/opt/local --with-mpfr=/opt/local --with-mpc=/opt/local --with-
 isl=/opt/local --enable-stage1-checking --disable-multilib --enable-lto
 --enable-libstdcxx-time --with-build-config=bootstrap-debug --with-
 as=/opt/local/bin/as --with-ld=/opt/local/bin/ld --with-
 ar=/opt/local/bin/ar --with-bugurl=https://trac.macports.org/newticket
 --disable-tls --with-pkgversion='MacPorts gcc7 7.2.0_0'
 Thread model: posix
 gcc version 7.2.0 (MacPorts gcc7 7.2.0_0)
 clang: error: assembler (via gcc) command failed with exit code 1 (use -v
 to see invocation)
 }}}

--
Ticket URL: <https://trac.macports.org/ticket/55592#comment:5>
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