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Oza, Hiral via llvm-dev

2016-Mar-14 16:17 UTC

[llvm-dev] LLVM-3.8.0 libcxx in-tree build fails with cmath error ::signbit has not been declared

cmake -E cmake_progress_report
llvm-3.8.0.src_bld_x86_64-rhel6.4-linux-gnu/CMakeFiles
In file included from llvm-3.8.0.src/projects/libcxx/include/__hash_table:19:0,
                 from llvm-3.8.0.src/projects/libcxx/src/hash.cpp:10:
llvm-3.8.0.src/projects/libcxx/include/cmath:310:9: error: '::signbit'
has not been declared
using ::signbit;
         ^
llvm-3.8.0.src/projects/libcxx/include/cmath:311:9: error:
'::fpclassify' has not been declared
using ::fpclassify;
         ^
llvm-3.8.0.src/projects/libcxx/include/cmath:312:9: error: '::isfinite'
has not been declared
using ::isfinite;
         ^
llvm-3.8.0.src/projects/libcxx/include/cmath:315:9: error: '::isnormal'
has not been declared
using ::isnormal;
         ^
llvm-3.8.0.src/projects/libcxx/include/cmath:316:9: error: '::isgreater'
has not been declared
using ::isgreater;
         ^
llvm-3.8.0.src/projects/libcxx/include/cmath:317:9: error:
'::isgreaterequal' has not been declared
using ::isgreaterequal;
         ^
llvm-3.8.0.src/projects/libcxx/include/cmath:318:9: error: '::isless'
has not been declared
using ::isless;
         ^
llvm-3.8.0.src/projects/libcxx/include/cmath:319:9: error:
'::islessequal' has not been declared
using ::islessequal;
         ^
llvm-3.8.0.src/projects/libcxx/include/cmath:320:9: error:
'::islessgreater' has not been declared
using ::islessgreater;
         ^
llvm-3.8.0.src/projects/libcxx/include/cmath:321:9: error:
'::isunordered' has not been declared
using ::isunordered;
         ^
llvm-3.8.0.src/projects/libcxx/include/cmath:322:9: error:
'::isunordered' has not been declared
using ::isunordered;
         ^
llvm-3.8.0.src/projects/libcxx/include/cmath:328:9: error: '::abs' has
not been declared
using ::abs;
         ^
In file included from llvm-3.8.0.src/projects/libcxx/include/functional:475:0,
                 from
llvm-3.8.0.src/projects/libcxx/include/experimental/optional:144,
                 from llvm-3.8.0.src/projects/libcxx/src/optional.cpp:10:
llvm-3.8.0.src/projects/libcxx/include/typeinfo: In member function 'size_t
std::type_info::hash_code() const':
llvm-3.8.0.src/projects/libcxx/include/typeinfo:116:62: warning: dereferencing
type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
         {return *reinterpret_cast<const size_t*>(&__type_name);}
                                                              ^
cmake -E cmake_progress_report
llvm-3.8.0.src_bld_x86_64-rhel6.4-linux-gnu/CMakeFiles
In file included from llvm-3.8.0.src/projects/libcxx/include/__hash_table:14:0,
                 from llvm-3.8.0.src/projects/libcxx/src/hash.cpp:10:
llvm-3.8.0.src/projects/libcxx/include/__config:448:50: warning:
'__unused__' attribute ignored [-Wattributes]
#define _LIBCPP_UNUSED __attribute__((__unused__))
                                                  ^
Thank you.
-H

From: Eric Fiselier [mailto:eric at efcs.ca]
Sent: Monday, March 14, 2016 8:55 PM
To: Oza, Hiral <Hiral.Oza at netapp.com>
Cc: cfe-dev at lists.llvm.org; LLVM Dev <llvm-dev at lists.llvm.org>
Subject: Re: [llvm-dev] LLVM-3.8.0 libcxx in-tree build fails with cmath error
::signbit has not been declared

Can you post the full error log please?

/Eric

On Mon, Mar 14, 2016 at 3:10 AM, Oza, Hiral via llvm-dev <llvm-dev at
lists.llvm.org<mailto:llvm-dev at lists.llvm.org>> wrote:
Greetings!

I have been building llvm-3.6.x, 3.7.1 and 3.7.2 with (glibc-2.12.1,
binutils-2.24, gcc-4.9.2) almost same set if CMake flags.
However while building LLVM-3.8.0 using same CMake flags I am observing
projects/libcxx/include/cmath errors...
        ...'::signbit' has not been declared
        ...'::fpclassify' has not been declared
        ...'::isfinite' has not been declared
        ...

My environment is...
        Glibc-2.12.1
        Binutils-2.24
        Gcc-4.92.
        Llvm-3.8.0

Cmake flags...
        -DBUILD_SHARED_LIBS=ON \
        -DCMAKE_BUILD_TYPE="Release" \
        -DCMAKE_CXX_COMPILER=$GCC_ROOT/bin/g++ \
        -DCMAKE_CXX_FLAGS="$CXXFLAGS" \
        -DCMAKE_CXX_LINK_FLAGS="$LDFLAGS" \
        -DCMAKE_C_COMPILER=$GCC_ROOT/bin/gcc \
        -DCMAKE_C_FLAGS="$CFLAGS" \
       -DCMAKE_C_LINK_FLAGS="$LDFLAGS" \
        -DCMAKE_INSTALL_PREFIX=$PREFIX_DIR \
        -DCMAKE_LIBRARY_PATH=${BASE_DIR}/lib \
        -DCMAKE_SKIP_INSTALL_RPATH=OFF \
        -DCMAKE_SKIP_RPATH=OFF \
        -DCMAKE_SYSTEM_INCLUDE_PATH=$myincpath \
        -DCMAKE_SYSTEM_LIBRARY_PATH=$mylibpath \
        -DCMAKE_VERBOSE_MAKEFILE=ON \
        -DCURSES_NEED_NCURSES=TRUE \
        -DFFI_INCLUDE_DIR=$DESTROOT/lib/libffi-3.0.11/include \
        -DFFI_LIBRARY_DIR=$DESTROOT/lib \
        -DGCC_INSTALL_PREFIX=$GCC_ROOT \
        -DLLVM_BINUTILS_INCDIR=${DESTROOT}/include \
        -DLLVM_BUILD_32_BITS=OFF \
        -DLLVM_BUILD_EXAMPLES=ON \
        -DLLVM_ENABLE_CXX1Y=ON \
        -DLLVM_ENABLE_EH=ON \
        -DLLVM_ENABLE_FFI=ON \
        -DLLVM_ENABLE_LIBCXX=ON \
        -DLLVM_ENABLE_RTTI=ON \
        -DLLVM_ENABLE_THREADS=ON \
        -DLLVM_ENABLE_ZLIB=ON \
        -DLLVM_INCLUDE_EXAMPLES=ON \
        -DLLVM_INCLUDE_UTILS=ON \
        -DLLVM_OPTIMIZED_TABLEGEN=ON \
        -DLLVM_PARALLEL_COMPILE_JOBS=15 \
        -DLLVM_PARALLEL_LINK_JOBS=15 \
        -DLLVM_TARGETS_TO_BUILD="X86" \
        -DLLVM_TARGETS_WITH_JIT="X86"

Any suggestions?

Thank you in advance.
-H

_______________________________________________
LLVM Developers mailing list
llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>
http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev

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Eric Fiselier via llvm-dev

2016-Mar-14 16:45 UTC

head link

[llvm-dev] LLVM-3.8.0 libcxx in-tree build fails with cmath error ::signbit has not been declared

Well unfortunately that doesn't help me either. Something really weird
seems to be going on because libc++ provides the definition for these
functions itself it libcxx/include/math.h. I suspect that maybe CMake is
really messing up the compiler invocation but honestly I have no clue.

Could you provide the compiler invocation used for that file?

/Eric

On Mon, Mar 14, 2016 at 10:17 AM, Oza, Hiral <Hiral.Oza at netapp.com>
wrote:
> cmake -E cmake_progress_report
> llvm-3.8.0.src_bld_x86_64-rhel6.4-linux-gnu/CMakeFiles
>
> In file included from
> llvm-3.8.0.src/projects/libcxx/include/__hash_table:19:0,
>
>                  from llvm-3.8.0.src/projects/libcxx/src/hash.cpp:10:
>
> llvm-3.8.0.src/projects/libcxx/include/cmath:310:9: error:
'::signbit' has
> not been declared
>
> using ::signbit;
>
>          ^
>
> llvm-3.8.0.src/projects/libcxx/include/cmath:311:9: error:
'::fpclassify'
> has not been declared
>
> using ::fpclassify;
>
>          ^
>
> llvm-3.8.0.src/projects/libcxx/include/cmath:312:9: error:
'::isfinite'
> has not been declared
>
> using ::isfinite;
>
>          ^
>
> llvm-3.8.0.src/projects/libcxx/include/cmath:315:9: error:
'::isnormal'
> has not been declared
>
> using ::isnormal;
>
>          ^
>
> llvm-3.8.0.src/projects/libcxx/include/cmath:316:9: error:
'::isgreater'
> has not been declared
>
> using ::isgreater;
>
>          ^
>
> llvm-3.8.0.src/projects/libcxx/include/cmath:317:9: error:
> '::isgreaterequal' has not been declared
>
> using ::isgreaterequal;
>
>          ^
>
> llvm-3.8.0.src/projects/libcxx/include/cmath:318:9: error:
'::isless' has
> not been declared
>
> using ::isless;
>
>          ^
>
> llvm-3.8.0.src/projects/libcxx/include/cmath:319:9: error:
'::islessequal'
> has not been declared
>
> using ::islessequal;
>
>          ^
>
> llvm-3.8.0.src/projects/libcxx/include/cmath:320:9: error:
> '::islessgreater' has not been declared
>
> using ::islessgreater;
>
>          ^
>
> llvm-3.8.0.src/projects/libcxx/include/cmath:321:9: error:
'::isunordered'
> has not been declared
>
> using ::isunordered;
>
>          ^
>
> llvm-3.8.0.src/projects/libcxx/include/cmath:322:9: error:
'::isunordered'
> has not been declared
>
> using ::isunordered;
>
>          ^
>
> llvm-3.8.0.src/projects/libcxx/include/cmath:328:9: error: '::abs'
has not
> been declared
>
> using ::abs;
>
>          ^
>
> In file included from
> llvm-3.8.0.src/projects/libcxx/include/functional:475:0,
>
>                  from
> llvm-3.8.0.src/projects/libcxx/include/experimental/optional:144,
>
>                  from llvm-3.8.0.src/projects/libcxx/src/optional.cpp:10:
>
> llvm-3.8.0.src/projects/libcxx/include/typeinfo: In member function
> 'size_t std::type_info::hash_code() const':
>
> llvm-3.8.0.src/projects/libcxx/include/typeinfo:116:62: warning:
> dereferencing type-punned pointer will break strict-aliasing rules
> [-Wstrict-aliasing]
>
>          {return *reinterpret_cast<const size_t*>(&__type_name);}
>
>                                                               ^
>
> cmake -E cmake_progress_report
> llvm-3.8.0.src_bld_x86_64-rhel6.4-linux-gnu/CMakeFiles
>
> In file included from
> llvm-3.8.0.src/projects/libcxx/include/__hash_table:14:0,
>
>                  from llvm-3.8.0.src/projects/libcxx/src/hash.cpp:10:
>
> llvm-3.8.0.src/projects/libcxx/include/__config:448:50: warning:
> '__unused__' attribute ignored [-Wattributes]
>
> #define _LIBCPP_UNUSED __attribute__((__unused__))
>
>                                                   ^
>
> Thank you.
>
> -H
>
>
>
> *From:* Eric Fiselier [mailto:eric at efcs.ca]
> *Sent:* Monday, March 14, 2016 8:55 PM
> *To:* Oza, Hiral <Hiral.Oza at netapp.com>
> *Cc:* cfe-dev at lists.llvm.org; LLVM Dev <llvm-dev at
lists.llvm.org>
> *Subject:* Re: [llvm-dev] LLVM-3.8.0 libcxx in-tree build fails with
> cmath error ::signbit has not been declared
>
>
>
> Can you post the full error log please?
>
>
>
> /Eric
>
>
>
> On Mon, Mar 14, 2016 at 3:10 AM, Oza, Hiral via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
> Greetings!
>
> I have been building llvm-3.6.x, 3.7.1 and 3.7.2 with (glibc-2.12.1,
> binutils-2.24, gcc-4.9.2) almost same set if CMake flags.
> However while building LLVM-3.8.0 using same CMake flags I am observing
> projects/libcxx/include/cmath errors...
>         ...'::signbit' has not been declared
>         ...'::fpclassify' has not been declared
>         ...'::isfinite' has not been declared
>         ...
>
> My environment is...
>         Glibc-2.12.1
>         Binutils-2.24
>         Gcc-4.92.
>         Llvm-3.8.0
>
> Cmake flags...
>         -DBUILD_SHARED_LIBS=ON \
>         -DCMAKE_BUILD_TYPE="Release" \
>         -DCMAKE_CXX_COMPILER=$GCC_ROOT/bin/g++ \
>         -DCMAKE_CXX_FLAGS="$CXXFLAGS" \
>         -DCMAKE_CXX_LINK_FLAGS="$LDFLAGS" \
>         -DCMAKE_C_COMPILER=$GCC_ROOT/bin/gcc \
>         -DCMAKE_C_FLAGS="$CFLAGS" \
>        -DCMAKE_C_LINK_FLAGS="$LDFLAGS" \
>         -DCMAKE_INSTALL_PREFIX=$PREFIX_DIR \
>         -DCMAKE_LIBRARY_PATH=${BASE_DIR}/lib \
>         -DCMAKE_SKIP_INSTALL_RPATH=OFF \
>         -DCMAKE_SKIP_RPATH=OFF \
>         -DCMAKE_SYSTEM_INCLUDE_PATH=$myincpath \
>         -DCMAKE_SYSTEM_LIBRARY_PATH=$mylibpath \
>         -DCMAKE_VERBOSE_MAKEFILE=ON \
>         -DCURSES_NEED_NCURSES=TRUE \
>         -DFFI_INCLUDE_DIR=$DESTROOT/lib/libffi-3.0.11/include \
>         -DFFI_LIBRARY_DIR=$DESTROOT/lib \
>         -DGCC_INSTALL_PREFIX=$GCC_ROOT \
>         -DLLVM_BINUTILS_INCDIR=${DESTROOT}/include \
>         -DLLVM_BUILD_32_BITS=OFF \
>         -DLLVM_BUILD_EXAMPLES=ON \
>         -DLLVM_ENABLE_CXX1Y=ON \
>         -DLLVM_ENABLE_EH=ON \
>         -DLLVM_ENABLE_FFI=ON \
>         -DLLVM_ENABLE_LIBCXX=ON \
>         -DLLVM_ENABLE_RTTI=ON \
>         -DLLVM_ENABLE_THREADS=ON \
>         -DLLVM_ENABLE_ZLIB=ON \
>         -DLLVM_INCLUDE_EXAMPLES=ON \
>         -DLLVM_INCLUDE_UTILS=ON \
>         -DLLVM_OPTIMIZED_TABLEGEN=ON \
>         -DLLVM_PARALLEL_COMPILE_JOBS=15 \
>         -DLLVM_PARALLEL_LINK_JOBS=15 \
>         -DLLVM_TARGETS_TO_BUILD="X86" \
>         -DLLVM_TARGETS_WITH_JIT="X86"
>
> Any suggestions?
>
> Thank you in advance.
> -H
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>
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Oza, Hiral via llvm-dev

2016-Mar-17 07:58 UTC

head link

[llvm-dev] LLVM-3.8.0 libcxx in-tree build fails with cmath error ::signbit has not been declared

Sorry Eric for late reply…
> Could you provide the compiler invocation used for that file?
Probably attached build log may help…

Appreciate your help.

Thank you.
-Hiral


From: Eric Fiselier [mailto:eric at efcs.ca]
Sent: Monday, March 14, 2016 10:16 PM
To: Oza, Hiral <Hiral.Oza at netapp.com>
Cc: cfe-dev at lists.llvm.org; LLVM Dev <llvm-dev at lists.llvm.org>
Subject: Re: [llvm-dev] LLVM-3.8.0 libcxx in-tree build fails with cmath error
::signbit has not been declared

Well unfortunately that doesn't help me either. Something really weird seems
to be going on because libc++ provides the definition for these functions itself
it libcxx/include/math.h. I suspect that maybe CMake is really messing up the
compiler invocation but honestly I have no clue.

Could you provide the compiler invocation used for that file?

/Eric

On Mon, Mar 14, 2016 at 10:17 AM, Oza, Hiral <Hiral.Oza at
netapp.com<mailto:Hiral.Oza at netapp.com>> wrote:
cmake -E cmake_progress_report
llvm-3.8.0.src_bld_x86_64-rhel6.4-linux-gnu/CMakeFiles
In file included from llvm-3.8.0.src/projects/libcxx/include/__hash_table:19:0,
                 from llvm-3.8.0.src/projects/libcxx/src/hash.cpp:10:
llvm-3.8.0.src/projects/libcxx/include/cmath:310:9: error: '::signbit'
has not been declared
using ::signbit;
         ^
llvm-3.8.0.src/projects/libcxx/include/cmath:311:9: error:
'::fpclassify' has not been declared
using ::fpclassify;
         ^
llvm-3.8.0.src/projects/libcxx/include/cmath:312:9: error: '::isfinite'
has not been declared
using ::isfinite;
         ^
llvm-3.8.0.src/projects/libcxx/include/cmath:315:9: error: '::isnormal'
has not been declared
using ::isnormal;
         ^
llvm-3.8.0.src/projects/libcxx/include/cmath:316:9: error: '::isgreater'
has not been declared
using ::isgreater;
         ^
llvm-3.8.0.src/projects/libcxx/include/cmath:317:9: error:
'::isgreaterequal' has not been declared
using ::isgreaterequal;
         ^
llvm-3.8.0.src/projects/libcxx/include/cmath:318:9: error: '::isless'
has not been declared
using ::isless;
         ^
llvm-3.8.0.src/projects/libcxx/include/cmath:319:9: error:
'::islessequal' has not been declared
using ::islessequal;
         ^
llvm-3.8.0.src/projects/libcxx/include/cmath:320:9: error:
'::islessgreater' has not been declared
using ::islessgreater;
         ^
llvm-3.8.0.src/projects/libcxx/include/cmath:321:9: error:
'::isunordered' has not been declared
using ::isunordered;
         ^
llvm-3.8.0.src/projects/libcxx/include/cmath:322:9: error:
'::isunordered' has not been declared
using ::isunordered;
         ^
llvm-3.8.0.src/projects/libcxx/include/cmath:328:9: error: '::abs' has
not been declared
using ::abs;
         ^
In file included from llvm-3.8.0.src/projects/libcxx/include/functional:475:0,
                 from
llvm-3.8.0.src/projects/libcxx/include/experimental/optional:144,
                 from llvm-3.8.0.src/projects/libcxx/src/optional.cpp:10:
llvm-3.8.0.src/projects/libcxx/include/typeinfo: In member function 'size_t
std::type_info::hash_code() const':
llvm-3.8.0.src/projects/libcxx/include/typeinfo:116:62: warning: dereferencing
type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
         {return *reinterpret_cast<const size_t*>(&__type_name);}
                                                              ^
cmake -E cmake_progress_report
llvm-3.8.0.src_bld_x86_64-rhel6.4-linux-gnu/CMakeFiles
In file included from llvm-3.8.0.src/projects/libcxx/include/__hash_table:14:0,
                 from llvm-3.8.0.src/projects/libcxx/src/hash.cpp:10:
llvm-3.8.0.src/projects/libcxx/include/__config:448:50: warning:
'__unused__' attribute ignored [-Wattributes]
#define _LIBCPP_UNUSED __attribute__((__unused__))
                                                  ^
Thank you.
-H

From: Eric Fiselier [mailto:eric at efcs.ca<mailto:eric at efcs.ca>]
Sent: Monday, March 14, 2016 8:55 PM
To: Oza, Hiral <Hiral.Oza at netapp.com<mailto:Hiral.Oza at
netapp.com>>
Cc: cfe-dev at lists.llvm.org<mailto:cfe-dev at lists.llvm.org>; LLVM Dev
<llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>>
Subject: Re: [llvm-dev] LLVM-3.8.0 libcxx in-tree build fails with cmath error
::signbit has not been declared

Can you post the full error log please?

/Eric

On Mon, Mar 14, 2016 at 3:10 AM, Oza, Hiral via llvm-dev <llvm-dev at
lists.llvm.org<mailto:llvm-dev at lists.llvm.org>> wrote:
Greetings!

I have been building llvm-3.6.x, 3.7.1 and 3.7.2 with (glibc-2.12.1,
binutils-2.24, gcc-4.9.2) almost same set if CMake flags.
However while building LLVM-3.8.0 using same CMake flags I am observing
projects/libcxx/include/cmath errors...
        ...'::signbit' has not been declared
        ...'::fpclassify' has not been declared
        ...'::isfinite' has not been declared
        ...

My environment is...
        Glibc-2.12.1
        Binutils-2.24
        Gcc-4.92.
        Llvm-3.8.0

Cmake flags...
        -DBUILD_SHARED_LIBS=ON \
        -DCMAKE_BUILD_TYPE="Release" \
        -DCMAKE_CXX_COMPILER=$GCC_ROOT/bin/g++ \
        -DCMAKE_CXX_FLAGS="$CXXFLAGS" \
        -DCMAKE_CXX_LINK_FLAGS="$LDFLAGS" \
        -DCMAKE_C_COMPILER=$GCC_ROOT/bin/gcc \
        -DCMAKE_C_FLAGS="$CFLAGS" \
       -DCMAKE_C_LINK_FLAGS="$LDFLAGS" \
        -DCMAKE_INSTALL_PREFIX=$PREFIX_DIR \
        -DCMAKE_LIBRARY_PATH=${BASE_DIR}/lib \
        -DCMAKE_SKIP_INSTALL_RPATH=OFF \
        -DCMAKE_SKIP_RPATH=OFF \
        -DCMAKE_SYSTEM_INCLUDE_PATH=$myincpath \
        -DCMAKE_SYSTEM_LIBRARY_PATH=$mylibpath \
        -DCMAKE_VERBOSE_MAKEFILE=ON \
        -DCURSES_NEED_NCURSES=TRUE \
        -DFFI_INCLUDE_DIR=$DESTROOT/lib/libffi-3.0.11/include \
        -DFFI_LIBRARY_DIR=$DESTROOT/lib \
        -DGCC_INSTALL_PREFIX=$GCC_ROOT \
        -DLLVM_BINUTILS_INCDIR=${DESTROOT}/include \
        -DLLVM_BUILD_32_BITS=OFF \
        -DLLVM_BUILD_EXAMPLES=ON \
        -DLLVM_ENABLE_CXX1Y=ON \
        -DLLVM_ENABLE_EH=ON \
        -DLLVM_ENABLE_FFI=ON \
        -DLLVM_ENABLE_LIBCXX=ON \
        -DLLVM_ENABLE_RTTI=ON \
        -DLLVM_ENABLE_THREADS=ON \
        -DLLVM_ENABLE_ZLIB=ON \
        -DLLVM_INCLUDE_EXAMPLES=ON \
        -DLLVM_INCLUDE_UTILS=ON \
        -DLLVM_OPTIMIZED_TABLEGEN=ON \
        -DLLVM_PARALLEL_COMPILE_JOBS=15 \
        -DLLVM_PARALLEL_LINK_JOBS=15 \
        -DLLVM_TARGETS_TO_BUILD="X86" \
        -DLLVM_TARGETS_WITH_JIT="X86"

Any suggestions?

Thank you in advance.
-H

_______________________________________________
LLVM Developers mailing list
llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>
http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev


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llvm dev - Mar 2016 - LLVM-3.8.0 libcxx in-tree build fails with cmath error ::signbit has not been declared

[llvm-dev] LLVM-3.8.0 libcxx in-tree build fails with cmath error ::signbit has not been declared

[llvm-dev] LLVM-3.8.0 libcxx in-tree build fails with cmath error ::signbit has not been declared

[llvm-dev] LLVM-3.8.0 libcxx in-tree build fails with cmath error ::signbit has not been declared