Export of internal Abseil changes

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1801102e11205861bc063e067e9fd4754b625c5a by Derek Mauro <dmauro@google.com>:

Internal change

PiperOrigin-RevId: 398562681

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485008445725d4013f60f4b2876f84b6b47932ec by Jorg Brown <jorg@google.com>:

Replace calls to std::isinf with comparison against max().

PiperOrigin-RevId: 398534255

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9b99d074d39ad677cf92f99549d22bb73f504f8f by Saleem Abdulrasool <abdulras@google.com>:

debugging: add support for non-glibc targets for debugging

This relaxes the ELF mem_image handling and subsequently enables the VDSO
support for non-glibc targets.  The primary need for the restriction was the
use of the `__GLIBC_PREREQ` macro.  If it is undefined, assume that the glibc
pre-requisite is unavailable.  This allows building the debugging_internal
target on musl targets.

PiperOrigin-RevId: 398499050

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3cc3630ef2226ae1981a944573f0f9c27a527ebf by Abseil Team <absl-team@google.com>:

Replace usages of `auto` with proper typedefs.

PiperOrigin-RevId: 398479551
GitOrigin-RevId: 1801102e11205861bc063e067e9fd4754b625c5a
Change-Id: Ib13e8612d1b263b9c1ae7f56a9f394b24c3add2e

1 files changed, 11 insertions, 10 deletions

diff --git a/absl/debugging/internal/elf_mem_image.cc b/absl/debugging/internal/elf_mem_image.cc
index 24cc0130..d6832eaf 100644
--- a/absl/debugging/internal/elf_mem_image.cc
+++ b/absl/debugging/internal/elf_mem_image.cc
@@ -22,6 +22,7 @@
 #include <string.h>
 #include <cassert>
 #include <cstddef>
+#include "absl/base/config.h"
 #include "absl/base/internal/raw_logging.h"
 
 // From binutils/include/elf/common.h (this doesn't appear to be documented
@@ -43,11 +44,11 @@ namespace debugging_internal {
 
 namespace {
 
-#if __WORDSIZE == 32
+#if __SIZEOF_POINTER__ == 4
 const int kElfClass = ELFCLASS32;
 int ElfBind(const ElfW(Sym) *symbol) { return ELF32_ST_BIND(symbol->st_info); }
 int ElfType(const ElfW(Sym) *symbol) { return ELF32_ST_TYPE(symbol->st_info); }
-#elif __WORDSIZE == 64
+#elif __SIZEOF_POINTER__ == 8
 const int kElfClass = ELFCLASS64;
 int ElfBind(const ElfW(Sym) *symbol) { return ELF64_ST_BIND(symbol->st_info); }
 int ElfType(const ElfW(Sym) *symbol) { return ELF64_ST_TYPE(symbol->st_info); }
@@ -175,17 +176,17 @@ void ElfMemImage::Init(const void *base) {
   }
   switch (base_as_char[EI_DATA]) {
     case ELFDATA2LSB: {
-      if (__LITTLE_ENDIAN != __BYTE_ORDER) {
-        assert(false);
-        return;
-      }
+#ifndef ABSL_IS_LITTLE_ENDIAN
+      assert(false);
+      return;
+#endif
       break;
     }
     case ELFDATA2MSB: {
-      if (__BIG_ENDIAN != __BYTE_ORDER) {
-        assert(false);
-        return;
-      }
+#ifndef ABSL_IS_BIG_ENDIAN
+      assert(false);
+      return;
+#endif
       break;
     }
     default: {