On Monday, August 7, 2017 at 1:13:46 PM UTC-5, Brad Larson wrote:
>
> Hello, I'm getting a compiler error when using GCC to target ARM 
> platforms.  I've patched this locally, but would like to upstream my patch 
> and am not sure on the best generally-acceptable solution.
>
> src/google/protobuf/io/coded_stream.h: In static
> member function 'static bool 
> google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic()':
> C:\projects\cycling\carlton\external\protobuf\src/google/protobuf/io/coded_stream.h:868:53:
>  
> error: invalid conversion from 'google::protobuf::internal::AtomicWord* 
> {aka int*}' to 'const volatile
> Atomic32* {aka const volatile long int*}' [-fpermissive]
>      return 
> google::protobuf::internal::Acquire_Load(&default_serialization_deterministic_);
>                                                     
>  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> On my platform, int32 is defined as long int and intptr_t is defined as 
> int (They both are 4 bytes).  This is causing the above error.
>
> Locally, I can easily change the type of Atomic32 to intptr_t or just int, 
> or change the type of AtomicWord to int32 or intptr_t.  But this isn't 
> generally acceptable of course.
>
> I'm not sure on what a better solution might be.  I see we already have a 
> check #if GOOGLE_PROTOBUF_ARCH_POWER to typedef Atomic32 to intptr_t in 
> some cases, and extra logic around #if defined(__ILP32__) || 
> defined(GOOGLE_PROTOBUF_OS_NACL).  Could this be simplified with a #if 
> sizeof intptr_t == sizeof int32 check (or similar)?
>
> Very open to any suggestions on how to upstream a fix for this!
>
> Thanks,
> Brad
>


If it is helpful, here are the current typedefs, from atomicops.h:

#if defined(GOOGLE_PROTOBUF_ARCH_POWER)
#if defined(_LP64) || defined(__LP64__)
typedef int32 Atomic32;
typedef intptr_t Atomic64;
#else
typedef intptr_t Atomic32;
typedef int64 Atomic64;
#endif
#else
typedef intptr_t Atomic32;
#ifdef GOOGLE_PROTOBUF_ARCH_64_BIT
// We need to be able to go between Atomic64 and AtomicWord implicitly. 
 This
// means Atomic64 and AtomicWord should be the same type on 64-bit.
#if defined(__ILP32__) || defined(GOOGLE_PROTOBUF_OS_NACL)
// NaCl's intptr_t is not actually 64-bits on 64-bit!
// http://code.google.com/p/nativeclient/issues/detail?id=1162
// sparcv9's pointer type is 32bits
typedef int64 Atomic64;
#else
typedef intptr_t Atomic64;
#endif
#endif
#endif

// Use AtomicWord for a machine-sized pointer.  It will use the Atomic32 or
// Atomic64 routines below, depending on your architecture.
typedef intptr_t AtomicWord; 

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