Build failure on clang/libc++ 4.0

[copumpkin]

I'm attempting to build 2.8 against clang and libc++ 4.0 but am getting immediate build errors:

$ make
Scanning dependencies of target rtags
[  1%] Building CXX object src/CMakeFiles/rtags.dir/ClangIndexer.cpp.o
In file included from /private/var/folders/vv/17b_hycx691699h20v458fnh0000gn/T/nix-build-rtags-2.8-p1.drv-0/rtags-f85bd60/src/ClangIndexer.cpp:17:
In file included from /private/var/folders/vv/17b_hycx691699h20v458fnh0000gn/T/nix-build-rtags-2.8-p1.drv-0/rtags-f85bd60/src/ClangIndexer.h:20:
In file included from /private/var/folders/vv/17b_hycx691699h20v458fnh0000gn/T/nix-build-rtags-2.8-p1.drv-0/rtags-f85bd60/src/Token.h:19:
In file included from /private/var/folders/vv/17b_hycx691699h20v458fnh0000gn/T/nix-build-rtags-2.8-p1.drv-0/rtags-f85bd60/src/rct/rct/Serializer.h:12:
In file included from /private/var/folders/vv/17b_hycx691699h20v458fnh0000gn/T/nix-build-rtags-2.8-p1.drv-0/rtags-f85bd60/src/rct/rct/Hash.h:5:
In file included from /nix/store/cl5xf788rlhc290cx69vhw1jlm929jj9-libc++-4.0.0/include/c++/v1/unordered_map:369:
In file included from /nix/store/cl5xf788rlhc290cx69vhw1jlm929jj9-libc++-4.0.0/include/c++/v1/__hash_table:19:
/nix/store/cl5xf788rlhc290cx69vhw1jlm929jj9-libc++-4.0.0/include/c++/v1/cmath:313:9: error: no member named 'signbit' in the global namespace
using ::signbit;
      ~~^
/nix/store/cl5xf788rlhc290cx69vhw1jlm929jj9-libc++-4.0.0/include/c++/v1/cmath:314:9: error: no member named 'fpclassify' in the global namespace
using ::fpclassify;
      ~~^
/nix/store/cl5xf788rlhc290cx69vhw1jlm929jj9-libc++-4.0.0/include/c++/v1/cmath:315:9: error: no member named 'isfinite' in the global namespace; did you mean 'finite'?
using ::isfinite;
      ~~^
/nix/store/759w4ay4qf3lpmash8bglgsizz66n2gr-MacOS_SDK-10.10/include/math.h:718:12: note: 'finite' declared here
extern int finite(double) __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_0, __MAC_10_9, __IPHONE_NA, __IPHONE_NA);
           ^
In file included from /private/var/folders/vv/17b_hycx691699h20v458fnh0000gn/T/nix-build-rtags-2.8-p1.drv-0/rtags-f85bd60/src/ClangIndexer.cpp:17:
In file included from /private/var/folders/vv/17b_hycx691699h20v458fnh0000gn/T/nix-build-rtags-2.8-p1.drv-0/rtags-f85bd60/src/ClangIndexer.h:20:
In file included from /private/var/folders/vv/17b_hycx691699h20v458fnh0000gn/T/nix-build-rtags-2.8-p1.drv-0/rtags-f85bd60/src/Token.h:19:
In file included from /private/var/folders/vv/17b_hycx691699h20v458fnh0000gn/T/nix-build-rtags-2.8-p1.drv-0/rtags-f85bd60/src/rct/rct/Serializer.h:12:
In file included from /private/var/folders/vv/17b_hycx691699h20v458fnh0000gn/T/nix-build-rtags-2.8-p1.drv-0/rtags-f85bd60/src/rct/rct/Hash.h:5:
In file included from /nix/store/cl5xf788rlhc290cx69vhw1jlm929jj9-libc++-4.0.0/include/c++/v1/unordered_map:369:
In file included from /nix/store/cl5xf788rlhc290cx69vhw1jlm929jj9-libc++-4.0.0/include/c++/v1/__hash_table:19:
/nix/store/cl5xf788rlhc290cx69vhw1jlm929jj9-libc++-4.0.0/include/c++/v1/cmath:316:9: error: no member named 'isinf' in the global namespace
using ::isinf;
      ~~^
/nix/store/cl5xf788rlhc290cx69vhw1jlm929jj9-libc++-4.0.0/include/c++/v1/cmath:317:9: error: no member named 'isnan' in the global namespace
using ::isnan;
      ~~^
/nix/store/cl5xf788rlhc290cx69vhw1jlm929jj9-libc++-4.0.0/include/c++/v1/cmath:318:9: error: no member named 'isnormal' in the global namespace
using ::isnormal;
      ~~^
/nix/store/cl5xf788rlhc290cx69vhw1jlm929jj9-libc++-4.0.0/include/c++/v1/cmath:319:9: error: no member named 'isgreater' in the global namespace
using ::isgreater;
      ~~^
/nix/store/cl5xf788rlhc290cx69vhw1jlm929jj9-libc++-4.0.0/include/c++/v1/cmath:320:9: error: no member named 'isgreaterequal' in the global namespace
using ::isgreaterequal;
      ~~^
/nix/store/cl5xf788rlhc290cx69vhw1jlm929jj9-libc++-4.0.0/include/c++/v1/cmath:321:9: error: no member named 'isless' in the global namespace
using ::isless;
      ~~^
/nix/store/cl5xf788rlhc290cx69vhw1jlm929jj9-libc++-4.0.0/include/c++/v1/cmath:322:9: error: no member named 'islessequal' in the global namespace
using ::islessequal;
      ~~^
/nix/store/cl5xf788rlhc290cx69vhw1jlm929jj9-libc++-4.0.0/include/c++/v1/cmath:323:9: error: no member named 'islessgreater' in the global namespace
using ::islessgreater;
      ~~^
/nix/store/cl5xf788rlhc290cx69vhw1jlm929jj9-libc++-4.0.0/include/c++/v1/cmath:324:9: error: no member named 'isunordered' in the global namespace
using ::isunordered;
      ~~^
/nix/store/cl5xf788rlhc290cx69vhw1jlm929jj9-libc++-4.0.0/include/c++/v1/cmath:325:9: error: no member named 'isunordered' in the global namespace
using ::isunordered;
      ~~^
13 errors generated.
make[2]: *** [src/CMakeFiles/rtags.dir/build.make:63: src/CMakeFiles/rtags.dir/ClangIndexer.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:198: src/CMakeFiles/rtags.dir/all] Error 2
make: *** [Makefile:128: all] Error 2

I'm using Nix to provide clang and libc++ so there's a slight chance that it's something strange about my environment, but it seems to work for everything else so it seems unlikely. Happy to try on a more traditional setup if this proves difficult to reproduce.

[copumpkin]

Oh I think it's actually a bug in my (wrapper) build script, not in this package. Sorry!

[hyc]

What was your error and fix? I just hit the same problem, google led me here.

[copumpkin]

@hyc in my case, I had some machinery that was inserting a traditional C-only math.h earlier in the search path than the same file from libc++. libc++ expects its "wrapper" math.h to come early so that it can #include_next the standard C math.h and wrap the functions in there properly.

[hyc]

Thanks, that helps.