Bug#1129949: llvm-toolchain-21: FTBFS on ppc64el on Trixie

[Trupti]

Hi Fabin,

As a quick update, I was able to reproduce the issue on ppc64el with 
Trixie. With below errors:

/build/reproducible-path/llvm-toolchain-21-21.1.8/cmake/Modules/../../libc/src/stdio/printf_core/float_hex_converter.h:43:30: 
error: no member named 'is_neg' in 
'__llvm_libc_common_utils::fputil::FPBits<long double>'
    43 |     is_negative = float_bits.is_neg();
       |                   ~~~~~~~~~~ ^
/build/reproducible-path/llvm-toolchain-21-21.1.8/cmake/Modules/../../libc/src/stdio/printf_core/float_hex_converter.h:44:27: 
error: no member named 'get_explicit_exponent' in 
'__llvm_libc_common_utils::fputil::FPBits<long double>'
    44 |     exponent = float_bits.get_explicit_exponent();
       |                ~~~~~~~~~~ ^
/build/reproducible-path/llvm-toolchain-21-21.1.8/cmake/Modules/../../libc/src/stdio/printf_core/float_hex_converter.h:45:27: 
error: no member named 'get_explicit_mantissa' in 
'__llvm_libc_common_utils::fputil::FPBits<long double>'
    45 |     mantissa = float_bits.get_explicit_mantissa();
       |                ~~~~~~~~~~ ^
/build/reproducible-path/llvm-toolchain-21-21.1.8/cmake/Modules/../../libc/src/stdio/printf_core/float_hex_converter.h:46:32: 
error: no member named 'is_inf_or_nan' in 
'__llvm_libc_common_utils::fputil::FPBits<long double>'
    46 |     is_inf_or_nan = float_bits.is_inf_or_nan();
       |                     ~~~~~~~~~~ ^
/build/reproducible-path/llvm-toolchain-21-21.1.8/cmake/Modules/../../libc/src/stdio/printf_core/float_hex_converter.h:87:16: 
error: no member named 'FRACTION_LEN' in 
'__llvm_libc_common_utils::fputil::FPBits<long double>'
    87 |       (LDBits::FRACTION_LEN / BITS_IN_HEX_DIGIT) + 1;
       |                ^~~~~~~~~~~~
/build/reproducible-path/llvm-toolchain-21-21.1.8/cmake/Modules/../../libc/src/stdio/printf_core/float_hex_converter.h:88:20: 
warning: variable length arrays in C++ are a Clang extension 
[-Wvla-cxx-extension]
    88 |   char mant_buffer[MANT_BUFF_LEN];
       |                    ^~~~~~~~~~~~~
/build/reproducible-path/llvm-toolchain-21-21.1.8/cmake/Modules/../../libc/src/stdio/printf_core/float_hex_converter.h:88:20: 
note: initializer of 'MANT_BUFF_LEN' is unknown
/build/reproducible-path/llvm-toolchain-21-21.1.8/cmake/Modules/../../libc/src/stdio/printf_core/float_hex_converter.h:86:20: 
note: declared here
    86 |   constexpr size_t MANT_BUFF_LEN =
       |                    ^
fatal error: too many errors emitted, stopping now [-ferror-limit=]




I'm currently testing the build with your suggested patches from 
https://github.com/llvm/llvm-project/pull/184995

I'm also discussing this with PowerPC toolchain experts to better 
understand
if there are any implications from the PPC side.

I will update here once I have more information.

Thanks,
Trupti