clang-devel seems to be broken on macOS 12

[catap (Kirill A. Korinsky)]

An attempt to compile a trivial program:

#include <iostream>

int main() {
    std::cout << "Hello World!";
    return 0;
}

fails as:

√ /tmp % /opt/local/libexec/llvm-devel/bin/clang++ test.cc                   
In file included from test.cc:1:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/iostream:43:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/ios:220:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/__ios/fpos.h:14:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/iosfwd:100:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/__mbstate_t.h:29:
/opt/local/libexec/llvm-devel/bin/../include/c++/v1/wchar.h:143:77: error: use of undeclared identifier 'wcschr'
wchar_t* __libcpp_wcschr(const wchar_t* __s, wchar_t __c) {return (wchar_t*)wcschr(__s, __c);}
                                                                            ^
/opt/local/libexec/llvm-devel/bin/../include/c++/v1/wchar.h:150:87: error: use of undeclared identifier 'wcspbrk'
wchar_t* __libcpp_wcspbrk(const wchar_t* __s1, const wchar_t* __s2) {return (wchar_t*)wcspbrk(__s1, __s2);}
                                                                                      ^
/opt/local/libexec/llvm-devel/bin/../include/c++/v1/wchar.h:157:78: 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);}
                                                                             ^
/opt/local/libexec/llvm-devel/bin/../include/c++/v1/wchar.h:145:16: note: 'wcschr' declared here
const wchar_t* wcschr(const wchar_t* __s, wchar_t __c) {return __libcpp_wcschr(__s, __c);}
               ^
/opt/local/libexec/llvm-devel/bin/../include/c++/v1/wchar.h:164:86: 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);}
                                                                                     ^
/opt/local/libexec/llvm-devel/bin/../include/c++/v1/wchar.h:147:16: note: 'wcschr' declared here
      wchar_t* wcschr(      wchar_t* __s, wchar_t __c) {return __libcpp_wcschr(__s, __c);}
               ^
/opt/local/libexec/llvm-devel/bin/../include/c++/v1/wchar.h:164:86: 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);}
                                                                                     ^
/opt/local/libexec/llvm-devel/bin/../include/c++/v1/wchar.h:147:16: note: candidate disabled: <no message provided>
      wchar_t* wcschr(      wchar_t* __s, wchar_t __c) {return __libcpp_wcschr(__s, __c);}
               ^
/opt/local/libexec/llvm-devel/bin/../include/c++/v1/wchar.h:164:93: 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);}
                                                                                            ^~~~
/opt/local/libexec/llvm-devel/bin/../include/c++/v1/wchar.h:147:38: note: passing argument to parameter '__s' here
      wchar_t* wcschr(      wchar_t* __s, wchar_t __c) {return __libcpp_wcschr(__s, __c);}
                                     ^
/opt/local/libexec/llvm-devel/bin/../include/c++/v1/wchar.h:171:90: error: use of undeclared identifier 'wmemchr'
wchar_t* __libcpp_wmemchr(const wchar_t* __s, wchar_t __c, size_t __n) {return (wchar_t*)wmemchr(__s, __c, __n);}
                                                                                         ^
In file included from test.cc:1:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/iostream:43:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/ios:220:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/__ios/fpos.h:14:
/opt/local/libexec/llvm-devel/bin/../include/c++/v1/iosfwd:218:14: error: reference to unresolved using declaration
typedef fpos<mbstate_t>    streampos;
             ^
/opt/local/libexec/llvm-devel/bin/../include/c++/v1/__mbstate_t.h:40:1: note: using declaration annotated with 'using_if_exists' here
using ::mbstate_t _LIBCPP_USING_IF_EXISTS;
^
In file included from test.cc:1:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/iostream:43:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/ios:220:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/__ios/fpos.h:14:
/opt/local/libexec/llvm-devel/bin/../include/c++/v1/iosfwd:218:14: error: reference to unresolved using declaration
typedef fpos<mbstate_t>    streampos;
             ^
/opt/local/libexec/llvm-devel/bin/../include/c++/v1/__mbstate_t.h:40:1: note: using declaration annotated with 'using_if_exists' here
using ::mbstate_t _LIBCPP_USING_IF_EXISTS;
^
In file included from test.cc:1:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/iostream:43:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/ios:220:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/__ios/fpos.h:14:
/opt/local/libexec/llvm-devel/bin/../include/c++/v1/iosfwd:219:14: error: reference to unresolved using declaration
typedef fpos<mbstate_t>    wstreampos;
             ^
/opt/local/libexec/llvm-devel/bin/../include/c++/v1/__mbstate_t.h:40:1: note: using declaration annotated with 'using_if_exists' here
using ::mbstate_t _LIBCPP_USING_IF_EXISTS;
^
In file included from test.cc:1:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/iostream:43:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/ios:220:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/__ios/fpos.h:14:
/opt/local/libexec/llvm-devel/bin/../include/c++/v1/iosfwd:219:14: error: reference to unresolved using declaration
typedef fpos<mbstate_t>    wstreampos;
             ^
/opt/local/libexec/llvm-devel/bin/../include/c++/v1/__mbstate_t.h:40:1: note: using declaration annotated with 'using_if_exists' here
using ::mbstate_t _LIBCPP_USING_IF_EXISTS;
^
In file included from test.cc:1:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/iostream:43:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/ios:220:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/__ios/fpos.h:14:
/opt/local/libexec/llvm-devel/bin/../include/c++/v1/iosfwd:223:14: error: reference to unresolved using declaration
typedef fpos<mbstate_t>    u16streampos;
             ^
/opt/local/libexec/llvm-devel/bin/../include/c++/v1/__mbstate_t.h:40:1: note: using declaration annotated with 'using_if_exists' here
using ::mbstate_t _LIBCPP_USING_IF_EXISTS;
^
In file included from test.cc:1:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/iostream:43:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/ios:220:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/__ios/fpos.h:14:
/opt/local/libexec/llvm-devel/bin/../include/c++/v1/iosfwd:223:14: error: reference to unresolved using declaration
typedef fpos<mbstate_t>    u16streampos;
             ^
/opt/local/libexec/llvm-devel/bin/../include/c++/v1/__mbstate_t.h:40:1: note: using declaration annotated with 'using_if_exists' here
using ::mbstate_t _LIBCPP_USING_IF_EXISTS;
^
In file included from test.cc:1:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/iostream:43:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/ios:220:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/__ios/fpos.h:14:
/opt/local/libexec/llvm-devel/bin/../include/c++/v1/iosfwd:224:14: error: reference to unresolved using declaration
typedef fpos<mbstate_t>    u32streampos;
             ^
/opt/local/libexec/llvm-devel/bin/../include/c++/v1/__mbstate_t.h:40:1: note: using declaration annotated with 'using_if_exists' here
using ::mbstate_t _LIBCPP_USING_IF_EXISTS;
^
In file included from test.cc:1:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/iostream:43:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/ios:220:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/__ios/fpos.h:14:
/opt/local/libexec/llvm-devel/bin/../include/c++/v1/iosfwd:224:14: error: reference to unresolved using declaration
typedef fpos<mbstate_t>    u32streampos;
             ^
/opt/local/libexec/llvm-devel/bin/../include/c++/v1/__mbstate_t.h:40:1: note: using declaration annotated with 'using_if_exists' here
using ::mbstate_t _LIBCPP_USING_IF_EXISTS;
^
In file included from test.cc:1:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/iostream:43:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/ios:221:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/__locale:18:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/mutex:191:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/__memory/shared_ptr.h:22:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/__memory/allocation_guard.h:14:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/__memory/allocator_traits.h:14:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/__memory/construct_at.h:20:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/new:93:
In file included from /opt/local/libexec/llvm-devel/bin/../include/c++/v1/cstdlib:87:
/opt/local/libexec/llvm-devel/bin/../include/c++/v1/stdlib.h:150:34: error: unknown type name 'ldiv_t'
inline _LIBCPP_INLINE_VISIBILITY ldiv_t div(long __x, long __y) _NOEXCEPT {
                                 ^
/opt/local/libexec/llvm-devel/bin/../include/c++/v1/stdlib.h:151:12: error: no member named 'ldiv' in the global namespace
  return ::ldiv(__x, __y);
         ~~^
/opt/local/libexec/llvm-devel/bin/../include/c++/v1/stdlib.h:154:34: error: unknown type name 'lldiv_t'
inline _LIBCPP_INLINE_VISIBILITY lldiv_t div(long long __x,
                                 ^
/opt/local/libexec/llvm-devel/bin/../include/c++/v1/stdlib.h:156:12: error: no member named 'lldiv' in the global namespace
  return ::lldiv(__x, __y);
         ~~^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.

[jmroot (Joshua Root)]

Please remember to Cc the port maintainers.

[kencu (Ken)]

working normally on MacOS 13 :

% clang++-mp-devel -v test.cc
clang version 16.0.0
Target: arm64-apple-darwin22.2.0
Thread model: posix
InstalledDir: /opt/local/libexec/llvm-devel/bin
 "/opt/local/libexec/llvm-devel/bin/clang" -cc1 -triple arm64-apple-macosx13.0.0 -Wundef-prefix=TARGET_OS_ -Werror=undef-prefix -Wdeprecated-objc-isa-usage -Werror=deprecated-objc-isa-usage -emit-obj -mrelax-all --mrelax-relocations -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name test.cc -mrelocation-model pic -pic-level 2 -mframe-pointer=non-leaf -ffp-contract=on -fno-rounding-math -funwind-tables=1 -target-sdk-version=13.1 -fcompatibility-qualified-id-block-type-checking -fvisibility-inlines-hidden-static-local-var -target-cpu apple-m1 -target-feature +v8.5a -target-feature +crc -target-feature +lse -target-feature +rdm -target-feature +crypto -target-feature +dotprod -target-feature +fp-armv8 -target-feature +neon -target-feature +fp16fml -target-feature +ras -target-feature +rcpc -target-feature +zcm -target-feature +zcz -target-feature +fullfp16 -target-feature +sm4 -target-feature +sha3 -target-feature +sha2 -target-feature +aes -target-abi darwinpcs -mllvm -treat-scalable-fixed-error-as-warning -debugger-tuning=lldb -target-linker-version 820.1 -v -fcoverage-compilation-dir=/Users/Shared -resource-dir /opt/local/libexec/llvm-devel/lib/clang/16 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk -I/usr/local/include -stdlib=libc++ -internal-isystem /opt/local/libexec/llvm-devel/bin/../include/c++/v1 -internal-isystem /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/local/include -internal-isystem /opt/local/libexec/llvm-devel/lib/clang/16/include -internal-externc-isystem /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include -fdeprecated-macro -fdebug-compilation-dir=/Users/Shared -ferror-limit 19 -stack-protector 1 -fblocks -fencode-extended-block-signature -fregister-global-dtors-with-atexit -fgnuc-version=4.2.1 -fcxx-exceptions -fexceptions -fmax-type-align=16 -fcolor-diagnostics -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /var/folders/97/nn3swcb52bg003_4bctdbyd80000gn/T/test-84bac6.o -x c++ test.cc
clang -cc1 version 16.0.0 based upon LLVM 16.0.0git default target arm64-apple-darwin22.2.0
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/local/include"
ignoring nonexistent directory "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/Library/Frameworks"
#include "..." search starts here:
#include <...> search starts here:
 /opt/local/libexec/llvm-devel/bin/../include/c++/v1
 /opt/local/libexec/llvm-devel/lib/clang/16/include
 /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include
 /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks (framework directory)
End of search list.
 "/opt/local/libexec/llvm-devel/bin/ld" -demangle -lto_library /opt/local/libexec/llvm-devel/lib/libLTO.dylib -no_deduplicate -dynamic -arch arm64 -platform_version macos 13.0.0 13.1 -syslibroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk -o a.out -L/usr/local/lib /var/folders/97/nn3swcb52bg003_4bctdbyd80000gn/T/test-84bac6.o -lc++ -lSystem /opt/local/libexec/llvm-devel/lib/clang/16/lib/darwin/libclang_rt.osx.a

if you use the "-v" option we might spot what is going wrong on your system. My first guess is it is not finding your MacOSX.sdk anywhere, but we shall see...

[catap (Kirill A. Korinsky)]

Ken, if I use clang++-mp-devel it works. It fails only when I call /opt/local/libexec/llvm-XXX/bin/clang++.

[kencu (Ken)]

Yeah, don't do that :>

when you go through clang++-mp-devel it calls clang through xcrun and that sets up the SDKROOT. Otherwise, if you want to call /opt/local/libexec/llvm-XXX/bin/clang++ then you must set up the SDKROOT yourself.

try it with "-v" like I said and you should see what I mean.

[kencu (Ken)]

At least I think that is what you will see when you try it -- you can tell me if that is what you see, after you do it.

[kencu (Ken)]

or do this:

/opt/local/libexec/llvm-devel/bin/clang++ -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk test.cc 

or this:

export SDKROOT=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk
/opt/local/libexec/llvm-devel/bin/clang++ test.cc

or -- etc etc

[catap (Kirill A. Korinsky)]

ah

=> feel free to close an issue.

[kencu (Ken)]

there are a lot of interactive moving parts to this equation, for sure!