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Gcc Error Cannot Bind Packed Field

You can test it by computing the difference between the address of the struct and the address of elem4, with and without packing the struct –Synxis Mar 30 '15 at 8:30 How much interest should I pay on a loan from a friend? Thanks a lot! Unsubstantiated Animal Shelter in Java IQ Puzzle with no pattern more hot questions question feed lang-cpp about us tour help blog chat data legal privacy policy work here advertising info mobile

Comment 3 Nevin Liber 2008-06-18 19:06:01 UTC Expanding on my last comment: which lines in the following code should fail to compile: struct Squeeze { short s; } __attribute__((aligned(1), packed)); void You signed in with another tab or window. Why did my electrician put metal plates wherever the stud is drilled through? I took out the __attribute__((__packed__)) when I > got the error. https://gcc.gnu.org/bugzilla/show_bug.cgi?id=36566

Have getPtr return a proxy instead. –Marc Glisse Dec 15 '14 at 19:45 @MarcGlisse: What do you mean with proxy here? –gexicide Dec 15 '14 at 19:47 Thanks, >> >> #pragma pack(2) >> >> typedef struct Blah { >> UInt32 a, b, c; >> SInt16 d; >> } Blah; >> >> #pragma actually, it only works in ANSI C code. And it wants your games.

up vote 4 down vote favorite when I compiled the following code: #include #include struct TupleHeader { timeval tuple_stime; // 34..37 }__attribute__((__packed__)); void set_value(timeval& stime){ } int main(){ TupleHeader http://JimsComputerRepairandWebDesign.com http://JesusnJim.com (my personal site, has software) http://DoLifeComputers.JesusnJim.com (group which I lead) --- Computer memory/disk size measurements: [KB KiB] [MB MiB] [GB GiB] [TB TiB] [10^3B=1,000B=1KB][2^10B=1,024B=1KiB] [10^6B=1,000,000B=1MB][2^20B=1,048,576B=1MiB] [10^9B=1,000,000,000B=1GB][2^30B=1,073,741,824B=1GiB] [10^12B=1,000,000,000,000B=1TB][2^40B=1,099,511,627,776B=1TiB] Note: disk the compiler shouldn't balk when I throw the -fpack-struct switch. Nov 8, 2006 - 01:13 PM 12345Total votes: 0 Compiles without complaints here, both GCC 3.4.6 and 4.1.0.

It seems that read only access of packed data members is fine, but write access through a reference is not. Do you have a > billion instances of Blah, so you need to save those 2 bytes? 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 Mar 14, 2004 Posts: 10 View posts #1 Posted by totenhose: Tue.

Comment 5 Hei 2013-09-13 04:14:47 UTC any update on this? What happens in the const T& case? How to use the binomial theorem to calculate binomials with a negative exponent reading through the definition of `\cfrac` in AMSMath Make all the statements true Why does this execution plan In file included from c:\mingw-w64-bin_i686-mingw_20101002_4.5_sezero\mingw64\bin\../lib/gcc/x86_64-w64-mingw32/4.5.2/../../../../x86_64-w64-mingw32/include/c++/4.5.2/ios:43:0, from c:\mingw-w64-bin_i686-mingw_20101002_4.5_sezero\mingw64\bin\../lib/gcc/x86_64-w64-mingw32/4.5.2/../../../../x86_64-w64-mingw32/include/c++/4.5.2/ostream:40, from c:\mingw-w64-bin_i686-mingw_20101002_4.5_sezero\mingw64\bin\../lib/gcc/x86_64-w64-mingw32/4.5.2/../../../../x86_64-w64-mingw32/include/c++/4.5.2/iterator:65, from diskgeom.cpp:49: c:\mingw-w64-bin_i686-mingw_20101002_4.5_sezero\mingw64\bin\../lib/gcc/x86_64-w64-mingw32/4.5.2/../../../../x86_64-w64-mingw32/include/c++/4.5.2/bits/ios_base.h: In member function 'std::ios_base::fmtflags std::ios_base::setf(std::ios_base::fmtflags)': c:\mingw-w64-bin_i686-mingw_20101002_4.5_sezero\mingw64\bin\../lib/gcc/x86_64-w64-mingw32/4.5.2/../../../../x86_64-w64-mingw32/include/c++/4.5.2/bits/ios_base.h:580:19: error: cannot bind packed field '((std::ios_base*)this)->std::ios_base::_M_flags' to 'std::_Ios_Fmtflags&' c:\mingw-w64-bin_i686-mingw_20101002_4.5_sezero\mingw64\bin\../lib/gcc/x86_64-w64-mingw32/4.5.2/../../../../x86_64-w64-mingw32/include/c++/4.5.2/bits/ios_base.h: In member function 'std::ios_base::fmtflags

gcc bug? http://stackoverflow.com/questions/25669751/what-are-other-methods-for-a-c-compile-error-about-attribute-packed Here is simple example: This is the struct. It seems that read only >> access of packed data members is fine, but write access through a >> reference is not. On less forgiving hardware platforms, trying to use `pit' will result in illegal instruction exceptions.

Sign up for the SourceForge newsletter: I agree to receive quotes, newsletters and other information from sourceforge.net and its partners regarding IT services and products. If the calling argument is a pointer >>> to UInt32, that will be okay with the compiler too. up vote 1 down vote favorite 2 I encountered a problem, passing struct member to a template function. Already have an account?

Is this an error in the compiler or is there a mistake in the code? Interesting enough, replacing const T& with T& in my template function, produces the error message: error: cannot bind packed field ‘testdata.TestStruct::elem4’ to ‘int&’ So, I have 2 questions: Why cannot packed-struct Can cats leave scratch marks on cars? There is no error and no warning (even with -Wall -Wextra), but not the right address is passed to the function.

Realloc "may" work but not malloc. ------------------- On the other hand, it's possible to use pointer-to-pointer method too :D And this way it works. An alignment is an implementation-defined integer value representing the number of bytes between successive addresses at which a given object can be allocated. I know what's going on, but this padding will break compatibility with files that don't use the padded version.

vooon closed this Dec 14, 2014 vooon added a commit that referenced this issue Mar 4, 2015 vooon

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 Karger's Algorithm question If Dumbledore is the most powerful wizard (allegedly), why would he work at a glorified boarding school? Is this the intended behavior or not? cov(x,y)=0 but corr(x,y)=1 Why doesn't ${@:-1} return the last element of [email protected]?