[cfe-users] Clang issues warning in system header

[Pavel Chuprikov via cfe-users]

Hello,

I'm trying to compile a test library, that uses boost.asio using clang, But
clang issues* a warning in a boost's header*, despite the fact that it is
passed using "*-isystem*".
I would be glad to investigate the problem further, but I just don't know
where to dig, since everything seems OK to me.

I use NixOS linux distribution, so that's where all the other parameters
are from (NixOS uses some kind of wrapper). But I don't see anything that
could affect warnings.

An output from a clang execution follows:

clang version 3.7.1 (tags/RELEASE_371/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
Found candidate GCC installation:
/nix/store/d2ljpb414jpmzik3cvl0xlmr5m4aggp7-gcc-5.3.0/lib/gcc/x86_64-unknown-linux-gnu/5.3.0
Found candidate GCC installation:
/nix/store/d2ljpb414jpmzik3cvl0xlmr5m4aggp7-gcc-5.3.0/lib64/gcc/x86_64-unknown-linux-gnu/5.3.0
Selected GCC installation:
/nix/store/d2ljpb414jpmzik3cvl0xlmr5m4aggp7-gcc-5.3.0/lib64/gcc/x86_64-unknown-linux-gnu/5.3.0
Candidate multilib: .;@m64
Selected multilib: .;@m64
 "/nix/store/x5v3p89l3i8v0jfnilr71yjv2vxqcfk5-clang-3.7.1/bin/clang-3.7"
-cc1 -triple x86_64-unknown-linux-gnu -emit-obj -mrelax-all -disable-free
-disable-llvm-verifier -main-file-name test.cpp -mrelocation-model static
-mthread-model posix -mdisable-fp-elim -fmath-errno -masm-verbose
-mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64
-v -dwarf-column-info -coverage-file
/home/pschuprikov/test/build/CMakeFiles/test.dir/test.o -nostdsysteminc
-resource-dir
/nix/store/x5v3p89l3i8v0jfnilr71yjv2vxqcfk5-clang-3.7.1/bin/../lib/clang/3.7.1
*-isystem
/nix/store/n6q76296i7vv03a6w07ii5q17vgn331x-boost-1.59.0-dev/include*
-idirafter /nix/store/bb32xf954imhdrzn7j8h82xs1bx7p3fr-glibc-2.23/include
-idirafter
/nix/store/x5v3p89l3i8v0jfnilr71yjv2vxqcfk5-clang-3.7.1/lib/gcc/*/*/include-fixed
*-isystem
/nix/store/n6q76296i7vv03a6w07ii5q17vgn331x-boost-1.59.0-dev/include*
-isystem
/nix/store/d2ljpb414jpmzik3cvl0xlmr5m4aggp7-gcc-5.3.0/include/c++/5.3.0
-isystem
/nix/store/d2ljpb414jpmzik3cvl0xlmr5m4aggp7-gcc-5.3.0/include/c++/5.3.0/x86_64-unknown-linux-gnu
-internal-isystem
/nix/store/x5v3p89l3i8v0jfnilr71yjv2vxqcfk5-clang-3.7.1/bin/../lib/clang/3.7.1/include
-Weverything -Wall -fdeprecated-macro -fdebug-compilation-dir
/home/pschuprikov/test/build -ferror-limit 19 -fmessage-length 239
-mstackrealign -fobjc-runtime=gcc -fcxx-exceptions -fexceptions
-fdiagnostics-show-option -fcolor-diagnostics -o CMakeFiles/test.dir/test.o
-x c++ /home/pschuprikov/test/test.cpp
clang -cc1 version 3.7.1 based upon LLVM 3.7.1 default target
x86_64-unknown-linux-gnu
ignoring nonexistent directory
"/nix/store/x5v3p89l3i8v0jfnilr71yjv2vxqcfk5-clang-3.7.1/lib/gcc/*/*/include-fixed"
ignoring duplicate directory
"/nix/store/n6q76296i7vv03a6w07ii5q17vgn331x-boost-1.59.0-dev/include"
#include "..." search starts here:
#include <...> search starts here:
 /nix/store/n6q76296i7vv03a6w07ii5q17vgn331x-boost-1.59.0-dev/include
 /nix/store/d2ljpb414jpmzik3cvl0xlmr5m4aggp7-gcc-5.3.0/include/c++/5.3.0
 /nix/store/d2ljpb414jpmzik3cvl0xlmr5m4aggp7-gcc-5.3.0/include/c++/5.3.0/x86_64-unknown-linux-gnu
 /nix/store/x5v3p89l3i8v0jfnilr71yjv2vxqcfk5-clang-3.7.1/bin/../lib/clang/3.7.1/include
 /nix/store/bb32xf954imhdrzn7j8h82xs1bx7p3fr-glibc-2.23/include
End of search list.
In file included from /home/pschuprikov/test/test.cpp:1:
In file included from include/boost/system/error_code.hpp:15:
*include/boost/cstdint.hpp:33:11: warning: macro name is a reserved
identifier [-Wreserved-id-macro]*
#  define __STDC_CONSTANT_MACROS

Thank you,
Pavel Chuprikov
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