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Gcc Error Cannot Bind Packed Field

I took out the __attribute__((__packed__)) >>>> when I got the error. Here is code which demonstrates the issue: struct Squeeze { short s; } __attribute__((aligned(1), packed)); void VerticallyChallenged(short&) {} int main() { Squeeze oj; short& pit(oj.s); VerticallyChallenged(pit); // okay VerticallyChallenged(oj.s); // cannot What are other methods to correct this error? Thanks a lot!

Beddingfield 2009-10-11 04:38:27 UTC I have the same problem with g++ 4.2.4 and 4.3.2. http://p.sf.net/sfu/ms-webmatrix-sf > > > > _______________________________________________ > Mingw-w64-public mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/mingw-w64-public Re: [Mingw-w64-public] g++ -fpack-struct and vector, iterator, stdint.h, iostream clash From: Jim Michaels - 2011-04-09 07:21:02 Unproven vs. vooon added bug plugin build error labels Dec 12, 2014 vooon added a commit that closed this issue Dec 14, 2014 vooon param: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=36566

Eric Albert Re: Alignment in structs Jul 15 2006, 00:57 On Jul 14, 2006, at 3:49 PM, Laurence Harris wrote: > What do I need to set in Xcode to get There >> might be a way to get gcc to emit code to check the address and >> handle calls to Foo with both aligned and unaligned reference >> parameters but Join them; it only takes a minute: Sign up What are other methods for a c++ compile error about __attribute__((__packed__))? c++ g++ share|improve this question edited Sep 5 '14 at 0:16 asked Sep 4 '14 at 15:46 abelard2008 571716 Write code that does not depend on structure padding (or

You can pass the reference if you change the function prototype to something like: typedef short un_short __attribute__((alignment(1))); void VerticallyChallenged(un_short&) {} ...and then call it with a cast like this: VerticallyChallenged((un_short&)oj.s); Please don't fill out this field. Is there a role with more responsibility? In the OP's case, the following code could violate the alignment requirements They suggest a workaround using alignment attribute to define your own aligned type but it does not look like

And it wants your games. The hardware memory access is the same > in either case. Related 112Why does flowing off the end of a non-void function without returning a value not produce a compiler error?1compilation error about exceptions81What is the purpose of using -pedantic in GCC/G++ click here now Beddingfield wrote in his comment: All assignments of obj.s to type short& and short* are incorrect, and ideally they would all result in compiler errors.

This issue also exists under gcc 4.0.1 (same host/target/build triplet as above) and gcc 4.1.2 under Linux. harti Previous message: g++ may fail to compile __packed structures Next message: Some SuCon 02 Photos Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] I know what's going on, but this padding will break compatibility with files that don't use the padded version. more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed

An authentic gaming smartphone on the nation's most reliable network. http://stackoverflow.com/questions/25669751/what-are-other-methods-for-a-c-compile-error-about-attribute-packed Even if you plan to update the preferences to something more modern, such as a plist, you'd still want to be able to read the old preferences. Security Patch SUPEE-8788 - Possible Problems? Jörg Wunsch Please don't send me PMs, use email if you want to approach me personally.

There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Master alredy fixed, see #170.">. … Master alredy fixed, see #170. 6c253a9 Sign up for free to join this conversation on GitHub. typedef struct Blah { UInt32 a : 32; UInt32 b : 32; UInt32 c : 32; SInt16 d : 16; } Blah; If you try Thanks, Larry Philip Ershler Re: Alignment in structs Jul 15 2006, 00:56 On Jul 14, 2006, at 4:49 PM, Laurence Harris wrote: > What do I need to set in Xcode

I read this: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=36566 and found that there is an issue, getting references to packed-struct members. Does chilli get milder with cooking? g++ may fail to compile __packed structures Harti Brandt harti at freebsd.org Wed Sep 8 05:06:42 PDT 2004 Previous message: g++ may fail to compile __packed structures Next message: Some SuCon Personal Open source Business Explore Sign up Sign in Pricing Blog Support Search GitHub This repository Watch 41 Star 83 Fork 195 mavlink/mavros Code Issues 40 Pull requests 4 Projects

The C++ spec (C++03, Sects. 3.9, 3.9.1, 3.9.2) are very clear that T and "pointer to T" have implementation-specific alignment requirements. 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 so it only half works. :-/ Jim Michaels ________________________________ From: Jaroslav Šmíd To: [email protected]

share|improve this answer edited Dec 15 '14 at 19:47 answered Dec 15 '14 at 19:21 Shafik Yaghmour 101k19232330 Don't believe this, just found the same bug report and was

On a 32-bit system using normal 4-byte alignment, d will be at offset 0, followed by two bytes of padding, followed by a, b, and c. #pragma pack(2) will pack them struct TestStruct { unsigned char elem1; unsigned char elem2; uint64_t elem3; char buf[10000]; int elem4; unsigned char elem5; } __attribute__ ((packed)); this is the template function, which should get a member's I will grant you that. If you have a "pointer to T" then you may assume that it meets the alignment requirements.

up vote 6 down vote favorite I use g++ to compile code with packed fields. Join them; it only takes a minute: Sign up Why can't I return a reference to a packed field? Do you have a billion instances of Blah, so you need to save those 2 bytes? Is there a Korean word for 'Syllable Block'?

If you don't want to do that manually you should be able to add -mms-bitfields to the compiler switches. There might be a way to get gcc to emit code to check the address and handle calls to Foo with both aligned and unaligned reference parameters but I don't know It seems that read only >> access of packed data members is fine, but write access through a >> reference is not. 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

It seems that read only > access of packed data members is fine, but write access through a > reference is not. Log in or register to post comments Top totenhose Level: New Member Joined: Sun. Even with a bitfield, the compiler can and will re-order your fields. You see #pragma options align=mac68k or #pragma pack(2) all over the place.

PR>Hence, why the disparity between the vanilla gcc and the lastest PR>gcc that comes with FreeBSD? Browse other questions tagged c++ c++11 gcc reference packed or ask your own question. Are > you sending Blahs over the wire to a remote location using some > custom protocol? Your getters and setters do need to be clever.

Filter columns basing on the value of other column more hot questions question feed default about us tour help blog chat data legal privacy policy work here advertising info mobile contact PR>Please correct me if I am wrong, but I think that __packed is not PR>part of the C or C++ standart, hence this leaves some gray area for PR>interpretation. Physically locating the server Appease Your Google Overlords: Draw the "G" Logo reading through the definition of `\cfrac` in AMSMath Can cats leave scratch marks on cars? Export The $PATH Variable, Line-By-Line In the United States is racial, ethnic, or national preference an acceptable hiring practice for departments or companies in some situations?

An alternative way to manage the packing is on a data member basis, i.e.: typedef struct Blah { UInt32 a,b,c; SInt16 d __attribute__((__packed__)); } Blah; This aligns the 32 bit values http://p.sf.net/sfu/verizon-sfdev _______________________________________________ Mingw-w64-public mailing list [email protected] You signed in with another tab or window.