From 23e6fbf571a6638ce9642fc1f50baf1af0f54268 Mon Sep 17 00:00:00 2001
From: Michael Forney <mforney@mforney.org>
Date: Mon, 16 Mar 2020 23:08:02 -0700
Subject: Use ULONG_MAX instead of __WORDSIZE to determine native ELF
 architecture

__WORDSIZE is an internal libc definition. Instead, we can use
ULONG_MAX from limits.h, whose value corresponds to the machine's
native word size.

This allows us to remove the fallback definition of __WORDSIZE in
the Android compatibility headers.

Bug: google-breakpad:631
Change-Id: I7b9e6f3b2121f78ccad9e32bf26acac518aefd8f
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/2107100
Reviewed-by: Mike Frysinger <vapier@chromium.org>
---
 src/common/dwarf/elf_reader.cc | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

(limited to 'src/common/dwarf')

diff --git a/src/common/dwarf/elf_reader.cc b/src/common/dwarf/elf_reader.cc
index 4135a51a..7dc46fd2 100644
--- a/src/common/dwarf/elf_reader.cc
+++ b/src/common/dwarf/elf_reader.cc
@@ -20,8 +20,8 @@
 // Although most of this code can deal with arbitrary ELF files of
 // either word size, the public ElfReader interface only examines
 // files loaded into the current address space, which must all match
-// __WORDSIZE. This code cannot handle ELF files with a non-native
-// byte ordering.
+// the machine's native word size. This code cannot handle ELF files
+// with a non-native byte ordering.
 //
 // TODO(chatham): It would be nice if we could accomplish this task
 // without using malloc(), so we could use it as the process is dying.
@@ -30,12 +30,13 @@
 #define _GNU_SOURCE  // needed for pread()
 #endif
 
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/mman.h>
-#include <unistd.h>
 #include <fcntl.h>
+#include <limits.h>
 #include <string.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
 
 #include <algorithm>
 #include <map>
@@ -1053,9 +1054,9 @@ ElfReader::~ElfReader() {
 
 
 // The only word-size specific part of this file is IsNativeElfFile().
-#if __WORDSIZE == 32
+#if ULONG_MAX == 0xffffffff
 #define NATIVE_ELF_ARCH Elf32
-#elif __WORDSIZE == 64
+#elif ULONG_MAX == 0xffffffffffffffff
 #define NATIVE_ELF_ARCH Elf64
 #else
 #error "Invalid word size"
-- 
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