compiling the project

[wstucco]

I'm trying to compile this project

I then run emcmake cmake -G "Unix Makefiles" . followed by emmake make

But all I get is a lot of errors (the complete output is attached below).

Can you point me to the right direction to build it from the sources?

make: ['make']
[  1%] Building CXX object xlnt-build/source/third-party/libstudxml/CMakeFiles/libstudxml.dir/xml/parser.cxx.o
In file included from $HOME/src/lab/xlnt-wasm/xlnt-src/third-party/libstudxml/xml/parser.cxx:5:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/new:85:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/exception:81:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/cstddef:38:
$HOME/src/lab/xlnt-wasm/xlnt-src/third-party/libstudxml/version:1:1: error: expected unqualified-id
1.1.0-a5
^
In file included from $HOME/src/lab/xlnt-wasm/xlnt-src/third-party/libstudxml/xml/parser.cxx:5:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/new:85:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/exception:81:
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/cstddef:51:9: error: no member named 'size_t' in the global namespace
using ::size_t;
      ~~^
In file included from $HOME/src/lab/xlnt-wasm/xlnt-src/third-party/libstudxml/xml/parser.cxx:5:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/new:85:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/exception:82:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/cstdlib:86:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/stdlib.h:94:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/compat/stdlib.h:14:
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libc/stdlib.h:38:15: error: use of undeclared identifier 'size_t'; did you mean 'sizeof'?
void *malloc (size_t);
              ^
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libc/stdlib.h:38:21: error: expected expression
void *malloc (size_t);
                    ^
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libc/stdlib.h:39:15: error: use of undeclared identifier 'size_t'; did you mean 'sizeof'?
void *calloc (size_t, size_t);
              ^
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libc/stdlib.h:39:21: error: expected expression
void *calloc (size_t, size_t);
                    ^
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libc/stdlib.h:39:23: error: use of undeclared identifier 'size_t'; did you mean 'sizeof'?
void *calloc (size_t, size_t);
                      ^
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libc/stdlib.h:40:24: error: unknown type name 'size_t'
void *realloc (void *, size_t);
                       ^
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libc/stdlib.h:42:21: error: unknown type name 'size_t'
void *aligned_alloc(size_t alignment, size_t size);
                    ^
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libc/stdlib.h:42:39: error: unknown type name 'size_t'
void *aligned_alloc(size_t alignment, size_t size);
                                      ^
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libc/stdlib.h:55:44: error: C++ requires a type specifier for all declarations
void *bsearch (const void *, const void *, size_t, size_t, int (*)(const void *, const void *));
                                           ^
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libc/stdlib.h:55:52: error: C++ requires a type specifier for all declarations
void *bsearch (const void *, const void *, size_t, size_t, int (*)(const void *, const void *));
                                                   ^
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libc/stdlib.h:55:52: error: redefinition of parameter 'size_t'
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libc/stdlib.h:55:44: note: previous declaration is here
void *bsearch (const void *, const void *, size_t, size_t, int (*)(const void *, const void *));
                                           ^
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libc/stdlib.h:56:21: error: C++ requires a type specifier for all declarations
void qsort (void *, size_t, size_t, int (*)(const void *, const void *));
                    ^
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libc/stdlib.h:56:29: error: C++ requires a type specifier for all declarations
void qsort (void *, size_t, size_t, int (*)(const void *, const void *));
                            ^
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libc/stdlib.h:56:29: error: redefinition of parameter 'size_t'
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libc/stdlib.h:56:21: note: previous declaration is here
void qsort (void *, size_t, size_t, int (*)(const void *, const void *));
                    ^
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libc/stdlib.h:70:26: error: unknown type name 'size_t'
int mblen (const char *, size_t);
                         ^
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libc/stdlib.h:71:58: error: unknown type name 'size_t'
int mbtowc (wchar_t *__restrict, const char *__restrict, size_t);
                                                         ^
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libc/stdlib.h:73:1: error: unknown type name 'size_t'
size_t mbstowcs (wchar_t *__restrict, const char *__restrict, size_t);
^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
shared:ERROR: '$HOME/src/sdk/emsdk/fastcomp/fastcomp/bin/clang++ -target asmjs-unknown-emscripten -D__EMSCRIPTEN_major__=1 -D__EMSCRIPTEN_minor__=38 -D__EMSCRIPTEN_tiny__=43 -D_LIBCPP_ABI_VERSION=2 -Werror=implicit-function-declaration -Xclang -nostdsysteminc -Xclang -isystem$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx -Xclang -isystem$HOME/src/sdk/emsdk/fastcomp/emscripten/system/lib/libcxxabi/include -Xclang -isystem$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/compat -Xclang -isystem$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include -Xclang -isystem$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libc -Xclang -isystem$HOME/src/sdk/emsdk/fastcomp/emscripten/system/lib/libc/musl/arch/emscripten -Xclang -isystem$HOME/src/sdk/emsdk/fastcomp/emscripten/system/local/include -DEMSCRIPTEN -DLIBSTUDXML_STATIC_LIB=1 -DXML_STATIC=1 -I$HOME/src/lab/xlnt-wasm/xlnt-src/third-party/libstudxml -std=gnu++11 -c $HOME/src/lab/xlnt-wasm/xlnt-src/third-party/libstudxml/xml/parser.cxx -Xclang -disable-O0-optnone -Xclang -isystem$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/SDL -c -o CMakeFiles/libstudxml.dir/xml/parser.cxx.o -emit-llvm' failed (1)
make[2]: *** [xlnt-build/source/third-party/libstudxml/CMakeFiles/libstudxml.dir/build.make:64: xlnt-build/source/third-party/libstudxml/CMakeFiles/libstudxml.dir/xml/parser.cxx.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:303: xlnt-build/source/third-party/libstudxml/CMakeFiles/libstudxml.dir/all] Error 2
make: *** [Makefile:130: all] Error 2

[isc30]

Could you please try using the docker image for emscripten? This way we can get deterministic errors and check what is wrong (im quite sure something changed in emscripten since i wrote the article and generates some build errors)

[wstucco]

@isc30 Thanks!
I will try the Docker image, meanwhile I'm running emscripten version 1.38.43 (emsdk activate 1.38.43)

[isc30]

also, as a good thing to check, what happens if you fix the build error you are getting or change C++ version? if I remember correctly, I was using C++14 target for this

[wstucco]

I've tried with the Docker image, same results.

Changing C++ std doesn't change anything, apparently no matter which standard I set in CMakeLists.txt clang++ is called with the param -std=gnu++11 as you can see in the log below.

I've noticed that by swapping line 45 and 46 of $EMSDK/fastcomp/emscripten/system/include/libcxx/cstddef from

// Don't include our own <stddef.h>; we don't want to declare ::nullptr_t.
#include_next <stddef.h>
#include <__nullptr>

to

// Don't include our own <stddef.h>; we don't want to declare ::nullptr_t.
#include <__nullptr>
#include_next <stddef.h>

the errors about size_t disappear, but now it fails in other places.

[  1%] Building CXX object xlnt-build/source/third-party/libstudxml/CMakeFiles/libstudxml.dir/xml/parser.cxx.o
In file included from $HOME/src/lab/xlnt-wasm/xlnt-src/third-party/libstudxml/xml/parser.cxx:5:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/new:85:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/exception:81:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/cstddef:38:
$HOME/src/lab/xlnt-wasm/xlnt-src/third-party/libstudxml/version:1:1: error: expected unqualified-id
1.1.0-a5
^
In file included from $HOME/src/lab/xlnt-wasm/xlnt-src/third-party/libstudxml/xml/parser.cxx:5:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/new:85:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/exception:83:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/type_traits:407:
$HOME/src/lab/xlnt-wasm/xlnt-src/third-party/libstudxml/version:1:1: error: expected unqualified-id
1.1.0-a5
^
In file included from $HOME/src/lab/xlnt-wasm/xlnt-src/third-party/libstudxml/xml/parser.cxx:5:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/new:85:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/exception:84:
$HOME/src/lab/xlnt-wasm/xlnt-src/third-party/libstudxml/version:1:1: error: expected unqualified-id
1.1.0-a5
^
In file included from $HOME/src/lab/xlnt-wasm/xlnt-src/third-party/libstudxml/xml/parser.cxx:5:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/new:88:
$HOME/src/lab/xlnt-wasm/xlnt-src/third-party/libstudxml/version:1:1: error: expected unqualified-id
1.1.0-a5
^
In file included from $HOME/src/lab/xlnt-wasm/xlnt-src/third-party/libstudxml/xml/parser.cxx:8:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/istream:163:
$HOME/src/lab/xlnt-wasm/xlnt-src/third-party/libstudxml/version:1:1: error: expected unqualified-id
1.1.0-a5
^
In file included from $HOME/src/lab/xlnt-wasm/xlnt-src/third-party/libstudxml/xml/parser.cxx:8:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/istream:164:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/ostream:138:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/ios:215:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/iosfwd:96:
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/wchar.h:137:77: error: use of undeclared identifier 'wcschr'
wchar_t* __libcpp_wcschr(const wchar_t* __s, wchar_t __c) {return (wchar_t*)wcschr(__s, __c);}
                                                                            ^
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/wchar.h:144:87: error: use of undeclared identifier 'wcspbrk'
wchar_t* __libcpp_wcspbrk(const wchar_t* __s1, const wchar_t* __s2) {return (wchar_t*)wcspbrk(__s1, __s2);}
                                                                                      ^
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/wchar.h:151:78: error: use of undeclared identifier 'wcsrchr'; did you mean
      'wcschr'?
wchar_t* __libcpp_wcsrchr(const wchar_t* __s, wchar_t __c) {return (wchar_t*)wcsrchr(__s, __c);}
                                                                             ^
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/wchar.h:139:16: note: 'wcschr' declared here
const wchar_t* wcschr(const wchar_t* __s, wchar_t __c) {return __libcpp_wcschr(__s, __c);}
               ^
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/wchar.h:158:86: error: use of undeclared identifier 'wcsstr'; did you mean 'wcschr'?
wchar_t* __libcpp_wcsstr(const wchar_t* __s1, const wchar_t* __s2) {return (wchar_t*)wcsstr(__s1, __s2);}
                                                                                     ^
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/wchar.h:141:16: note: 'wcschr' declared here
      wchar_t* wcschr(      wchar_t* __s, wchar_t __c) {return __libcpp_wcschr(__s, __c);}
               ^
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/wchar.h:158:86: error: no matching function for call to 'wcschr'
wchar_t* __libcpp_wcsstr(const wchar_t* __s1, const wchar_t* __s2) {return (wchar_t*)wcsstr(__s1, __s2);}
                                                                                     ^
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/wchar.h:141:16: note: candidate disabled: <no message provided>
      wchar_t* wcschr(      wchar_t* __s, wchar_t __c) {return __libcpp_wcschr(__s, __c);}
               ^
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/wchar.h:158:93: error: cannot initialize a parameter of type 'wchar_t *' with an
      lvalue of type 'const wchar_t *'
wchar_t* __libcpp_wcsstr(const wchar_t* __s1, const wchar_t* __s2) {return (wchar_t*)wcsstr(__s1, __s2);}
                                                                                            ^~~~
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/wchar.h:141:38: note: passing argument to parameter '__s' here
      wchar_t* wcschr(      wchar_t* __s, wchar_t __c) {return __libcpp_wcschr(__s, __c);}
                                     ^
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/wchar.h:165:90: error: use of undeclared identifier 'wmemchr'; did you mean
      'memchr'?
wchar_t* __libcpp_wmemchr(const wchar_t* __s, wchar_t __c, size_t __n) {return (wchar_t*)wmemchr(__s, __c, __n);}
                                                                                         ^
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/string.h:97:13: note: 'memchr' declared here
const void* memchr(const void* __s, int __c, size_t __n) {return __libcpp_memchr(__s, __c, __n);}
            ^
In file included from $HOME/src/lab/xlnt-wasm/xlnt-src/third-party/libstudxml/xml/parser.cxx:8:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/istream:164:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/ostream:138:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/ios:215:
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/iosfwd:190:14: error: use of undeclared identifier 'mbstate_t'
typedef fpos<mbstate_t>    streampos;
             ^
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/iosfwd:191:14: error: use of undeclared identifier 'mbstate_t'
typedef fpos<mbstate_t>    wstreampos;
             ^
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/iosfwd:196:14: error: use of undeclared identifier 'mbstate_t'
typedef fpos<mbstate_t>    u16streampos;
             ^
$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/iosfwd:197:14: error: use of undeclared identifier 'mbstate_t'
typedef fpos<mbstate_t>    u32streampos;
             ^
In file included from $HOME/src/lab/xlnt-wasm/xlnt-src/third-party/libstudxml/xml/parser.cxx:8:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/istream:164:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/ostream:138:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/ios:216:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/__locale:15:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/string:505:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/string_view:176:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/__string:57:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/algorithm:643:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/utility:206:
$HOME/src/lab/xlnt-wasm/xlnt-src/third-party/libstudxml/version:1:1: error: expected unqualified-id
1.1.0-a5
^
In file included from $HOME/src/lab/xlnt-wasm/xlnt-src/third-party/libstudxml/xml/parser.cxx:8:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/istream:164:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/ostream:138:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/ios:216:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/__locale:15:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/string:505:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/string_view:176:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/__string:57:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/algorithm:644:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/memory:659:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/limits:122:
$HOME/src/lab/xlnt-wasm/xlnt-src/third-party/libstudxml/version:1:1: error: expected unqualified-id
1.1.0-a5
^
In file included from $HOME/src/lab/xlnt-wasm/xlnt-src/third-party/libstudxml/xml/parser.cxx:8:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/istream:164:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/ostream:138:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/ios:216:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/__locale:15:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/string:505:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/string_view:176:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/__string:57:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/algorithm:644:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/memory:660:
In file included from $HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx/iterator:421:
$HOME/src/lab/xlnt-wasm/xlnt-src/third-party/libstudxml/version:1:1: error: expected unqualified-id
1.1.0-a5
^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
shared:ERROR: '$HOME/src/sdk/emsdk/fastcomp/fastcomp/bin/clang++ -target asmjs-unknown-emscripten -D__EMSCRIPTEN_major__=1 -D__EMSCRIPTEN_minor__=38 -D__EMSCRIPTEN_tiny__=43 -D_LIBCPP_ABI_VERSION=2 -Werror=implicit-function-declaration -Xclang -nostdsysteminc -Xclang -isystem$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx -Xclang -isystem$HOME/src/sdk/emsdk/fastcomp/emscripten/system/lib/libcxxabi/include -Xclang -isystem$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/compat -Xclang -isystem$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include -Xclang -isystem$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libc -Xclang -isystem$HOME/src/sdk/emsdk/fastcomp/emscripten/system/lib/libc/musl/arch/emscripten -Xclang -isystem$HOME/src/sdk/emsdk/fastcomp/emscripten/system/local/include -DEMSCRIPTEN -DLIBSTUDXML_STATIC_LIB=1 -DXML_STATIC=1 -I$HOME/src/lab/xlnt-wasm/xlnt-src/third-party/libstudxml -std=gnu++11 -c $HOME/src/lab/xlnt-wasm/xlnt-src/third-party/libstudxml/xml/parser.cxx -Xclang -disable-O0-optnone -Xclang -isystem$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/SDL -c -o CMakeFiles/libstudxml.dir/xml/parser.cxx.o -emit-llvm' failed (1)
make[2]: *** [xlnt-build/source/third-party/libstudxml/CMakeFiles/libstudxml.dir/build.make:64: xlnt-build/source/third-party/libstudxml/CMakeFiles/libstudxml.dir/xml/parser.cxx.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:303: xlnt-build/source/third-party/libstudxml/CMakeFiles/libstudxml.dir/all] Error 2
make: *** [Makefile:130: all] Error 2

The command being run is

$HOME/src/sdk/emsdk/fastcomp/fastcomp/bin/clang++ -target asmjs-unknown-emscripten -D__EMSCRIPTEN_major__=1 -D__EMSCRIPTEN_minor__=38 -D__EMSCRIPTEN_tiny__=43 -D_LIBCPP_ABI_VERSION=2 -Werror=implicit-function-declaration -Xclang -nostdsysteminc -Xclang -isystem$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libcxx -Xclang -isystem$HOME/src/sdk/emsdk/fastcomp/emscripten/system/lib/libcxxabi/include -Xclang -isystem$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/compat -Xclang -isystem$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include -Xclang -isystem$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/libc -Xclang -isystem$HOME/src/sdk/emsdk/fastcomp/emscripten/system/lib/libc/musl/arch/emscripten -Xclang -isystem$HOME/src/sdk/emsdk/fastcomp/emscripten/system/local/include -DEMSCRIPTEN -DLIBSTUDXML_STATIC_LIB=1 -DXML_STATIC=1 -I$HOME/src/lab/xlnt-wasm/xlnt-src/third-party/libstudxml -std=gnu++11 -c $HOME/src/lab/xlnt-wasm/xlnt-src/third-party/libstudxml/xml/parser.cxx -Xclang -disable-O0-optnone -Xclang -isystem$HOME/src/sdk/emsdk/fastcomp/emscripten/system/include/SDL -c -o CMakeFiles/libstudxml.dir/xml/parser.cxx.o -emit-llvm' failed (1)

[isc30]

Yeah, there is definitely something weird going on there. Will have a look this weekend.

[wstucco]

@isc30 Thanks a lot!

[isc30]

I'm extremely busy these days, can you try to force C++14 in emscripten somehow and see what happens pls?

[ejyanezp]

I am having this problem also, are there some news here?

I used the following lines, to compile just parser.cxx trying to isolate the problem, I already made the change indicated by @wstucco to avoid the size_t errors.

em++ -std=c++14 -c parser.cxx -I.. -o parser.o
em++ -std=c++17 -c parser.cxx -I.. -o parser.o

I got errors like:
`
In file included from parser.cxx:5:
In file included from /home/eduardo/webassembly/emsdk/upstream/emscripten/system/include/libcxx/new:90:
In file included from /home/eduardo/webassembly/emsdk/upstream/emscripten/system/include/libcxx/exception:80:
In file included from /home/eduardo/webassembly/emsdk/upstream/emscripten/system/include/libcxx/cstddef:37:
../version:1:1: error: expected unqualified-id
1.1.0-b.8
^

/home/eduardo/webassembly/emsdk/upstream/emscripten/system/include/libcxx/wchar.h:136:77: error: use of undeclared identifier 'wcschr'
wchar_t* __libcpp_wcschr(const wchar_t* __s, wchar_t __c) {return (wchar_t*)wcschr(__s, __c);}
^
/home/eduardo/webassembly/emsdk/upstream/emscripten/system/include/libcxx/wchar.h:143:87: error: use of undeclared identifier 'wcspbrk'
wchar_t* __libcpp_wcspbrk(const wchar_t* __s1, const wchar_t* __s2) {return (wchar_t*)wcspbrk(__s1, __s2);}
^
/home/eduardo/webassembly/emsdk/upstream/emscripten/system/include/libcxx/wchar.h:150:78: error: use of undeclared identifier 'wcsrchr'; did you mean 'wcschr'?
wchar_t* __libcpp_wcsrchr(const wchar_t* __s, wchar_t __c) {return (wchar_t*)wcsrchr(__s, __c);}
^
`
And a lot more errors.

[ejyanezp]

Another important data is that we can compile the file parser.cxx with the linux clang++ compiler:

clang++ -I.. -std=c++14 -c parser.cxx -o parcer.o

I am using clang 10.0 in Ubuntu:
clang version 10.0.0-4ubuntu1 Target: x86_64-pc-linux-gnu Thread model: posix InstalledDir: /usr/bin

But cannot compile the same file with em++ command line, which uses it own clang version 12:
clang version 12.0.0 (/b/s/w/ir/cache/git/chromium.googlesource.com-external-github.qkg1.top-llvm-llvm--project 9f21947a331203ee2579db87f1d1ec22a949e20a) Target: x86_64-unknown-linux-gnu Thread model: posix InstalledDir: /home/eduardo/webassembly/emsdk/upstream/bin/.

I used the following command line for compiling:
eduardo@mars:libstudxml$ em++ -c -std=c++14 -I.. parser.cxx -o parser.o In file included from parser.cxx:5: In file included from /home/eduardo/webassembly/emsdk/upstream/emscripten/system/include/libcxx/new:90: In file included from /home/eduardo/webassembly/emsdk/upstream/emscripten/system/include/libcxx/exception:80: In file included from /home/eduardo/webassembly/emsdk/upstream/emscripten/system/include/libcxx/cstddef:37: ../version:1:1: error: expected unqualified-id 1.1.0-b.8 ^

But if I use the clang++ compiler that comes with emscripten directly (not using em++ frontend)
/home/eduardo/webassembly/emsdk/upstream/bin/clang++ -c -I.. -std=c++14 parser.cxx -o parser.o

It compiles without problem to an object file parser.o

So, it is not the compiler, for me the root cause is in the port of the C/C++ libraries to emscripten, there is something weird hidden in those include files.

[ejyanezp]

I trace the error down:
The xlnt-wasm/build/xlnt-src/third-party/libstudxml/ folder had a "version" file, colliding with the file:
emsdk/upstream/emscripten/system/include/libcxx/version
Conclusion:
It is a very bad Idea to name a version file with the same name of a file in the C++ include files folder.
Put apart your own file with an .txt extension, remember C++ include files does not have extensions so it is an easy way.

Give it a name like:
xlnt-wasm/build/xlnt-src/third-party/libstudxml/version.txt
Instead of
xlnt-wasm/build/xlnt-src/third-party/libstudxml/version

After renaming this file I was able to compile xlnt-wasm without problems.