I am currently trying to build libcxx but well I am having trouble.
The current problem is that I am getting the following compile error:
In file included from
/home/user/dev/emscripten_dev/emscripten/system/lib/libcxx/exception.cpp:12:
In file included from
/home/user/dev/emscripten_dev/emscripten/system/include/libcxx/exception:81:
/home/user/dev/emscripten_dev/emscripten/system/include/libcxx/cstddef:43:15:
fatal error: 'stddef.h' file not
found
#include_next <stddef.h>
^
1 error generated.
#include_next is probably used to modify the system included stddef.h
header as the new version of libcxx provides their own
stddef.h/stdio.h/stdlib.h...
But clang couldn't find the header so I looked at the command line and
noticed that libcxx and libc include dirs should be swapped because
otherwise clang can't find the header, it's just how #include_next works I
guess.
The old command line (obtained by EMCC_DEBUG=1):
/home/user/dev/emscripten_dev/emscripten-fastcomp/build/bin/clang++ \
-target asmjs-unknown-emscripten \
-D__EMSCRIPTEN_major__=1 \
-D__EMSCRIPTEN_minor__=36 \
-D__EMSCRIPTEN_tiny__=3 \
-Werror=implicit-function-declaration \
-nostdinc \
-Xclang \
-nobuiltininc \
-Xclang \
-nostdsysteminc \
-Xclang \
-isystem/home/user/dev/emscripten_dev/emscripten/system/local/include \
-Xclang \
-isystem/home/user/dev/emscripten_dev/emscripten/system/include/compat \
-Xclang \
-isystem/home/user/dev/emscripten_dev/emscripten/system/include \
-Xclang \
-isystem/home/user/dev/emscripten_dev/emscripten/system/include/emscripten \
-Xclang \
-isystem/home/user/dev/emscripten_dev/emscripten/system/include/libc \
-Xclang \
-isystem/home/user/dev/emscripten_dev/emscripten/system/lib/libc/musl/arch/emscripten
\
-Xclang \
-isystem/home/user/dev/emscripten_dev/emscripten/system/include/libcxx \
-Xclang \
-isystem/home/user/dev/emscripten_dev/emscripten/system/lib/libcxxabi/include
\
-std=c++11 \
-Oz \
-mllvm \
-disable-llvm-optzns \
/home/user/dev/emscripten_dev/emscripten/system/lib/libcxx/exception.cpp \
-Xclang \
-isystem/home/user/dev/emscripten_dev/emscripten/system/include/SDL \
-emit-llvm \
-c \
-o /tmp/tmprVBuXXXX
I got this working by inserting
"-isystem/home/user/dev/emscripten_dev/emscripten/system/include/libcxx"
before the libc include dir.
So the current workaround is to reorder the include dirs (libcxx before
libc becuase of libc header modified using libcxx headers) but I am not
exactly sure how I could implement a proper fix for this as emcc somehow
automatically adds these default compiler flags. Is there any way to change
this?
Am Montag, 2. Mai 2016 02:17:18 UTC+2 schrieb Alon Zakai:
>
> We used to need some hacks due to limitations of our libc, but there have
> been fewer each time we update libc. I'm actually not sure if we need any
> more. It would be great it you checked if plain recent libcxx works, and if
> so, opened a PR with that update.
>
> On Sun, May 1, 2016 at 12:17 PM, <[email protected] <javascript:>> wrote:
>
>> Oh, I have just checked out the source of libcxx included in emscripten
>> and it seems that it has not been modified for emscripten. Am I wrong with
>> that? Does libcxx need modification to work with emscripten? In the case
>> that it doesn't any modification, it seems that I will give it a try using
>> a newer version of libcxx.
>>
>> Am Sonntag, 1. Mai 2016 20:59:09 UTC+2 schrieb [email protected]:
>>>
>>> Hey,
>>>
>>> I noticed that emscripten is using a pretty old version of libcxx and
>>> isn't fully C++14 compliant as for example there should be a constexpr
>>> version of operator[] in std::array but the constexpr version doesn't exist
>>> and so it means that that old version of libcxx may not fully support
>>> C++14. Is there any option to get an updated version of libcxx into
>>> emscripten?
>>>
>>> ~ Paul
>>>
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