Issue 42002: Breakpad DWARF parser: avoid using <stdint.h> type

It seems that a use of the <stdint.h> type uintptr_t has crept into
the DWARF parser. This defines a workaround for the GNU compilers
(tested on both Mac and Linux) which will raise an error if it doesn't
work.

My personal preference would be just to assume that the <stdint.h>
header is available and use the standard types everywhere, but 1) that
would be a large change, likely to make merges with the other branches
of the DWARF parser more difficult, and 2) it would make it quite
difficult to build under Microsoft Visual Studio, which doesn't have
the <stdint.h> header; Microsoft has said they have no plans to
provide it, as they would rather "focus their efforts" on C++ and
.NET.

a=jimblandy, r=nealsid


git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@448 4c0a9323-5329-0410-9bdc-e9ce6186880e

src/common/dwarf/dwarf2reader.cc

@@ -605,7 +605,7 @@ bool LineInfo::ProcessOneOpcode(ByteReader* reader,
                                 const char* start,
                                 struct LineStateMachine* lsm,
                                 size_t* len,
-                                uintptr_t pc,
+                                uintptr pc,
                                 bool *lsm_passes_pc) {
   size_t oplen = 0;
   size_t templen;
@@ -806,7 +806,8 @@ void LineInfo::ReadLines() {
     while (!lsm.end_sequence) {
       size_t oplength;
       bool add_line = ProcessOneOpcode(reader_, handler_, header_,
-                                       lineptr, &lsm, &oplength, (uintptr_t)-1, NULL);
+                                       lineptr, &lsm, &oplength, (uintptr)-1,
+                                       NULL);
       if (add_line)
         handler_->AddLine(lsm.address, lsm.file_num, lsm.line_num,
                           lsm.column_num);

src/common/dwarf/dwarf2reader.h

@@ -110,7 +110,7 @@ class LineInfo {
                                const char* start,
                                struct LineStateMachine* lsm,
                                size_t* len,
-                               uintptr_t pc,
+                               uintptr pc,
                                bool *lsm_passes_pc);
 
  private:

src/common/dwarf/types.h

@@ -43,4 +43,11 @@ typedef unsigned short     uint16;
 typedef unsigned int       uint32;
 typedef unsigned long long uint64;
 
+#ifdef __PTRDIFF_TYPE__
+typedef          __PTRDIFF_TYPE__ intptr;
+typedef unsigned __PTRDIFF_TYPE__ uintptr;
+#else
+#error "Can't find pointer-sized integral types."
+#endif
+
 #endif // _COMMON_DWARF_TYPES_H__