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Gcc Error Cannot Bind Packed Field

I'd avoid packing your struct if at >> all possible or doing: >> >> Blah data = { 1, 2, 3, 4 }; >> UInt32 a = data.a; >> err = It seems that read only > access of packed data members is fine, but write access through a > reference is not. I will grant you that. What's the purpose of passing a pointer as a reference parameter, anyway?

c++ c++11 gcc reference packed share|improve this question edited Dec 15 '14 at 19:24 0x499602D2 57.2k1990166 asked Dec 15 '14 at 19:17 gexicide 15.9k84380 6 If it's packed, the field I wonder if there was some kind of > compiler error the first time. > From what I've read, it appears that gcc would not complain if the calling argument were A reference is just like a pointer (with > fewer capabilities) and wouldn't handle unaligned loads/stores. > There might be a way to get gcc to emit code to check the Security Patch SUPEE-8788 - Possible Problems?

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Jonathan Wakely wrote: A const-reference causes a temporary to be created, you didn't bind to the packed field The bottom line is that it's not a bug itself that you can't Why did my electrician put metal plates wherever the stud is drilled through? more hot questions question feed lang-cpp about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation asked 1 year ago viewed 526 times active 1 year ago Related 384Why isn't sizeof for a struct equal to the sum of sizeof of each member?1458How do I pass a

There is no error, no warning, but the incorrect address is passed to the function. Is it plausible for my creature to have similar IQ as humans? On x86/x86_64 it's *usually* no big deal because the CPU will gracefully handle unaligned memory access (with a performance penalty). Bonuses If you have a "pointer to T" then you may assume that it meets the alignment requirements.

In the OP's case, the following code could violate the alignment requirements: short& pit(obj.s); /* invalid */ For example &obj.s could have an address 0x602011 (which has 1-byte alignement). If the calling argument is a pointer to UInt32, >> that will be okay with the compiler too. computer memory (RAM) is measured in MiB and GiB. Then I put it back and was going to use your suggestion, but I don't get the error now.

If I explicitly create a reference to the member variable first and pass that, things work fine. http://stackoverflow.com/questions/25669751/what-are-other-methods-for-a-c-compile-error-about-attribute-packed vooon closed this Dec 14, 2014 vooon added a commit that referenced this issue Mar 4, 2015 vooon

I took out the __attribute__((__packed__)) >>>> when I got the error. GCC Bugzilla – Bug36566 Cannot bind packed field Last modified: 2015-03-18 01:55:54 UTC Home | New | Browse | Search | [?] | Reports | Help | NewAccount | Log In Thanks a lot! Is there a Korean word for 'Syllable Block'?

https://lists.sourceforge.net/lists/listinfo/mingw-w64-public Re: [Mingw-w64-public] g++ -fpack-struct and vector, iterator, stdint.h, iostream clash From: Earnie - 2011-04-11 13:37:36 Jim Michaels wrote: > the point is, I shouldn't have to modify the code. Dec 20, 2002 Posts: 7524 View posts Location: Dresden, Germany #3 Posted by dl8dtl: Wed. You signed in with another tab or window.

but not with g++.

date: invalid date '2016-10-16' In Harry Potter book 7, why didn't the Order flee Britain after Harry turned seventeen? struct Squeeze { short s; } __attribute__((aligned(1), packed)); void VerticallyChallenged(const short&) {} int main() { Squeeze oj; const short& pit(oj.s); VerticallyChallenged(pit); VerticallyChallenged(oj.s); } Comment 8 Jonathan Wakely 2015-03-18 01:55:54 UTC (In I'd avoid packing your struct if > at all possible or doing: > > Blah data = { 1, 2, 3, 4 }; > UInt32 a = data.a; > err = unless your method of "packing" is compiler > independent. > > the compiler shouldn't balk when I throw the -fpack-struct switch. > so why did they even make the switch if

Re: [Mingw-w64-public] g++ -fpack-struct and vector, iterator, stdint.h, iostream clash From: Jaroslav Šmíd - 2011-04-08 08:15:50 Looks like GCC requires that the field is aligned in order to create reference Reload to refresh your session. up vote 1 down vote favorite 2 I encountered a problem, passing struct member to a template function. This code compiles ok with Dev-Cpp, so i think it's the avr-gcc idiomatique.

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