message: [lldb] Use local definition of get_cpuid_count
  Summary:
  This is needed for gcc/cstdlib++ 5.4.0, where __get_cpuid_count is not
  defined in cpuid.h.
  Reviewers: labath
  Subscribers: lldb-commits
  Tags: #lldb
diff: #include <cpuid.h>
  #include <linux/elf.h>
  +// Newer toolchains define __get_cpuid_count in cpuid.h, but some
  +// older-but-still-supported ones (e.g. gcc 5.4.0) don't, so we
  +// define it locally here, following the definition in clang/lib/Headers.
  +static inline int get_cpuid_count(unsigned int __leaf,
  + unsigned int __subleaf,
  + unsigned int *__eax, unsigned int *__ebx,
  + unsigned int *__ecx, unsigned int *__edx)
  +{
  + unsigned int __max_leaf = __get_cpuid_max(__leaf & 0x80000000, 0);
  +
  + if (__max_leaf == 0 || __max_leaf < __leaf)
  + return 0;
  +
  + __cpuid_count(__leaf, __subleaf, *__eax, *__ebx, *__ecx, *__edx);
  + return 1;
  +}
  +
  using namespace lldb_private;
  using namespace lldb_private::process_linux;
  @@ -269,7 +286,7 @@ static std::size_t GetXSTATESize() {
  return sizeof(FPR);
  // Then fetch the maximum size of the area.
  - if (!__get_cpuid_count(0x0d, 0, &eax, &ebx, &ecx, &edx))
  + if (!get_cpuid_count(0x0d, 0, &eax, &ebx, &ecx, &edx))
  return sizeof(FPR);
  return std::max<std::size_t>(ecx, sizeof(FPR));
  }
  