[llvm-bugs] [Bug 40415] New: __WORDSIZE defined as 32 for aarch64-linux-gnu

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https://bugs.llvm.org/show_bug.cgi?id=40415

            Bug ID: 40415
           Summary: __WORDSIZE defined as 32 for aarch64-linux-gnu
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Headers
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ndesaulniers at google.com
                CC: craig.topper at gmail.com, kristof.beyls at arm.com,
                    llvm-bugs at lists.llvm.org, peter.smith at linaro.org,
                    pirama at google.com, richard-llvm at metafoo.co.uk,
                    srhines at google.com

Created attachment 21365
  --> https://bugs.llvm.org/attachment.cgi?id=21365&action=edit
wordsize.c

glibc's stdint.h for aarch64-linux-gnu uses the preprocessor symbol __WORDSIZE
to set the typedef of uint64_t.  GCC sets this to symbol to 64, while Clang
sets it to 32 (I think Clang is in the wrong).

ex:
$ cat wordsize.c 
#include <stdint.h>
int foo() {
  return __WORDSIZE;
}
$ clang -target aarch64-linux-gnu -c wordsize.c
$ llvm-objdump -d wordsize.o

wordsize.o:     file format ELF64-aarch64-little

Disassembly of section .text:
0000000000000000 foo:
       0:       e0 03 1b 32     orr     w0, wzr, #0x20 ; 0x20 == 32
       4:       c0 03 5f d6     ret
$ aarch64-linux-gnu-gcc -c wordsize.c
$ llvm-objdump -d wordsize.o         

wordsize.o:     file format ELF64-aarch64-little

Disassembly of section .text:
0000000000000000 foo:
       0:       00 08 80 52     mov     w0, #64
       4:       c0 03 5f d6     ret

Relevant section from /usr/aarch64-linux-gnu/include/stdint.h:
#if __WORDSIZE == 64
typedef unsigned long int       uint64_t;
#else
__extension__
typedef unsigned long long int  uint64_t;
#endif

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