python3-grpcio: Fix build with gcc-14

* crypto: use _Generic only if !defined(__cplusplus)

* fixes build with gcc-14 which has __builtin_addc and __builtin_subc
  with gcc-13 it was already using the #else branch because of missing builtins

* fixes
  https://github.com/grpc/grpc/issues/35945
  http://errors.yoctoproject.org/Errors/Details/766916/

* _Generic was introduced in boringssl with:
  https://boringssl.googlesource.com/boringssl/+/70ca6bc24be103dabd68e448cd3af29b929b771d%5E%21/#F4

* but e.g. third_party/boringssl-with-bazel/src/ssl/d1_both.cc includes
  this internal.h and from the .cc extension gcc will process it as C++
  where _Generic isn't available, causing:

In file included from third_party/boringssl-with-bazel/src/ssl/d1_both.cc:125:
third_party/boringssl-with-bazel/src/ssl/../crypto/internal.h: In function 'uint32_t CRYPTO_addc_u32(uint32_t, uint32_t, uint32_t, uint32_t*)':
third_party/boringssl-with-bazel/src/ssl/../crypto/internal.h:1159:7: error: expected primary-expression before 'unsigned'
 1159 |       unsigned: __builtin_addc,                     \
      |       ^~~~~~~~
third_party/boringssl-with-bazel/src/ssl/../crypto/internal.h:1166:10: note: in expansion of macro 'CRYPTO_GENERIC_ADDC'
 1166 |   return CRYPTO_GENERIC_ADDC(x, y, carry, out_carry);
      |          ^~~~~~~~~~~~~~~~~~~
third_party/boringssl-with-bazel/src/ssl/../crypto/internal.h:1160:7: error: expected primary-expression before 'unsigned'
 1160 |       unsigned long: __builtin_addcl,               \
      |       ^~~~~~~~
third_party/boringssl-with-bazel/src/ssl/../crypto/internal.h:1166:10: note: in expansion of macro 'CRYPTO_GENERIC_ADDC'
 1166 |   return CRYPTO_GENERIC_ADDC(x, y, carry, out_carry);
      |          ^~~~~~~~~~~~~~~~~~~
third_party/boringssl-with-bazel/src/ssl/../crypto/internal.h:1161:7: error: expected primary-expression before 'unsigned'
 1161 |       unsigned long long: __builtin_addcll))((x), (y), (carry), (out_carry))
      |       ^~~~~~~~
third_party/boringssl-with-bazel/src/ssl/../crypto/internal.h:1166:10: note: in expansion of macro 'CRYPTO_GENERIC_ADDC'
 1166 |   return CRYPTO_GENERIC_ADDC(x, y, carry, out_carry);
      |          ^~~~~~~~~~~~~~~~~~~
third_party/boringssl-with-bazel/src/ssl/../crypto/internal.h:1158:4: error: '_Generic' was not declared in this scope
 1158 |   (_Generic((x),                                    \
      |    ^~~~~~~~
third_party/boringssl-with-bazel/src/ssl/../crypto/internal.h:1166:10: note: in expansion of macro 'CRYPTO_GENERIC_ADDC'
 1166 |   return CRYPTO_GENERIC_ADDC(x, y, carry, out_carry);
      |          ^~~~~~~~~~~~~~~~~~~

Signed-off-by: Martin Jansa <martin.jansa@gmail.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

0 files changed, 0 insertions, 0 deletions