Build Error

[Lee-creator]

The following error occurs when compiling and installing LLVM20 from source on a server with a KunPeng-920 as the CPU：

It can be solved by comment /llvm-project/libc/src/__support/complex_type.h:42 and three lines after this line.
Maybe float128 and long double are the same thing on KunPeng-920.

[llvmbot]

@llvm/issue-subscribers-libc

Author: Zhuohang Lee (Lee-creator)

The following error occurs when compiling and installing LLVM20 from source on a server with a KunPeng-920 as the CPU：

It can be solved by comment /home/lzh/llvm-project/libc/src/__support/complex_type.h:42 and three lines after this line.
Maybe float128 and long double are the same thing on KunPeng-920.

[nickdesaulniers]

KunPeng-920 as the CPU

For reference for other reviewers; that's an aarch64 cpu (from hisilicon).

The following error

Please copy the text directly into the issue report next time, rather than attach a screenshot.

cc @Sh0g0-1758 , author of the recently added cproj in c98e79d.

Perhaps this was fixed recently by abd9102? This issue was filed on the day that commit was authored...

[Sh0g0-1758]

Hello @Lee-creator! Can you please share which commit you checked out of ? The bug that you shared should have been patched by #119324 and #119330

[Sh0g0-1758]

Marking this as closed because the issue is:

1. not reproducible
2. is most likely patched by the PRs I linked above.

Feel free to reopen this if the issue persists for you and don't forget to share the cmake command and the commit you checked out of.

[nablajs]

FYI - just hit this compiling for arm64 in a linux arm64 vm building with pre-built Clang at release tag llvmorg-20.1.7:

FAILED: [code=1] projects/libc/src/complex/generic/CMakeFiles/libc.src.complex.generic.cproj.dir/cproj.cpp.o 
/usr/bin/c++ -DLIBC_NAMESPACE=__llvm_libc_20_1_7_ -I<...>/dev/build/llvmorg-20.1.7/projects/libc/src/complex/generic -I<...>/dev/repos/3p/llvm-project/libc/src/complex/generic -I<...>/dev/repos/3p/llvm-project/libc -isystem <...>/dev/build/llvmorg-20.1.7/projects/libc/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -fno-lifetime-dse -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-maybe-uninitialized -Wno-nonnull -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wno-misleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O2 -g -DNDEBUG -std=c++17 -DLIBC_QSORT_IMPL=LIBC_QSORT_QUICK_SORT -DLIBC_ADD_NULL_CHECKS -fpie -fno-builtin -fno-exceptions -fno-lax-vector-conversions -fno-unwind-tables -fno-asynchronous-unwind-tables -fno-rtti -ftrivial-auto-var-init=pattern -fno-omit-frame-pointer -Wall -Wextra -Werror -Wconversion -Wno-sign-conversion -fext-numeric-literals -Wno-pedantic -Wimplicit-fallthrough -Wwrite-strings -Wextra-semi -O3 -DLIBC_COPT_PUBLIC_PACKAGING -MD -MT projects/libc/src/complex/generic/CMakeFiles/libc.src.complex.generic.cproj.dir/cproj.cpp.o -MF projects/libc/src/complex/generic/CMakeFiles/libc.src.complex.generic.cproj.dir/cproj.cpp.o.d -o projects/libc/src/complex/generic/CMakeFiles/libc.src.complex.generic.cproj.dir/cproj.cpp.o -c <...>/dev/repos/3p/llvm-project/libc/src/complex/generic/cproj.cpp
In file included from <...>/dev/repos/3p/llvm-project/libc/src/__support/complex_basic_ops.h:12,
                 from <...>/dev/repos/3p/llvm-project/libc/src/complex/generic/cproj.cpp:11:
<...>/dev/repos/3p/llvm-project/libc/src/__support/complex_type.h:40:20: error: redefinition of ‘struct __llvm_libc_20_1_7_::make_complex<long double>’
   40 | template <> struct make_complex<float128> {
      |                    ^~~~~~~~~~~~~~~~~~~~~~
<...>/dev/repos/3p/llvm-project/libc/src/__support/complex_type.h:30:20: note: previous definition of ‘struct __llvm_libc_20_1_7_::make_complex<long double>’
   30 | template <> struct make_complex<long double> {
      |                    ^~~~~~~~~~~~~~~~~~~~~~~~~

[nablajs]

looks like this precompiler check may be broken for arm64 or something:

 39 #ifdef LIBC_TYPES_CFLOAT128_IS_NOT_COMPLEX_LONG_DOUBLE
 40 template <> struct make_complex<float128> {
 41   using type = cfloat128;
 42 };
 43 #endif

[michaelrj-google]

Please create a new issue if you'd like to report a bug. Also I'd recommend checking out the latest sources since your issue may already be resolved.