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

[Eric Fiselier via cfe-dev]

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
>
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