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Re: [Qemu-devel] CMSG_SPACE() causing compile time error on Mac OS X


From: Programmingkid
Subject: Re: [Qemu-devel] CMSG_SPACE() causing compile time error on Mac OS X
Date: Mon, 18 Jan 2016 20:23:18 -0500

On Jan 18, 2016, at 5:09 PM, Peter Maydell wrote:

> On 18 January 2016 at 21:09, Programmingkid <address@hidden> wrote:
>> 
>> On Jan 18, 2016, at 3:49 PM, Peter Maydell wrote:
>>> Can you say what 'gcc --version' prints for you? That will
>>> tell us the clang version number, which is more interesting
>>> than what clang claims its gcc-compatibility is.
>> 
>> $ gcc-4.9 --version
>> gcc-4.9 (Homebrew gcc49 4.9.2_1) 4.9.2
>> Copyright (C) 2014 Free Software Foundation, Inc.
>> This is free software; see the source for copying conditions.  There is NO
>> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
> 
> Ah, I misread your earlier message and I thought you said that
> gcc-4.9 worked ok and it was plain 'gcc' that caused the warning.
> Is that expansion of the macro the one produced by gcc-4.9, then?

Actually it should have but wasn't. It is of gcc 4.2.1.

Here is gcc 4.9.2's output:

char control[(((__darwin_size_t)((char *)(__darwin_size_t)(sizeof(struct 
cmsghdr)) + (sizeof(__uint32_t) - 1)) &~ (sizeof(__uint32_t) - 1)) + 
((__darwin_size_t)((char *)(__darwin_size_t)(sizeof(int) * 16) + 
(sizeof(__uint32_t) - 1)) &~ (sizeof(__uint32_t) - 1)))] = { 0 };

This is gcc 4.2.1's output:

char control[(((__darwin_size_t)((char *)(__darwin_size_t)(sizeof(struct 
cmsghdr)) + (sizeof(__uint32_t) - 1)) &~ (sizeof(__uint32_t) - 1)) + 
((__darwin_size_t)((char *)(__darwin_size_t)(sizeof(int) * 16) + 
(sizeof(__uint32_t) - 1)) &~ (sizeof(__uint32_t) - 1)))] = { 0 };

They appear to be identical. 

> 
> Also, you're right that we should figure out why it seems to
> be using the wrong C compiler. Can you use 'V=1' to look at
> what command line make is using to compile this file, please?
> (you'll probably want to dump the whole make output to a file
> and then search through it).

It says gcc-4.9 for the compiler. I wonder if the wrong header file is being 
used somewhere. 

> Also:
> *  what does your config-host.mak say (in particular about what
> it's set CC, HOST_CC, CXX, etc to)?

CC=gcc-4.9
HOST_CC=cc
CXX=gcc-4.9
CPP=gcc-4.9 -E
OBJCC=gcc-4.9

> * can you check your environment doesn't have CC set to anything?
> ("env | grep CC" should tell you if it is)

Nothing is returned.




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