BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  BCB 5.0 UP1 '          BorlandTalk.com Forum Index -> C++ Builder (Language C++) View previous topic :: View next topic   Author Message Stephen Phillips Guest Posted: Mon Apr 16, 2007 7:08 pm    Post subject: BCB 5.0 UP1 ' I'm getting a few puzzling messages especially since this has extern "C" { } defined around it ... BCB's compilor assumes the rules of C++ it appears -----------------------------8<--------------------------- [C++ Error] sqlite3.h(1778): E2232 Constant member 'sqlite3 _index_info::nConstraint' in class without constructors [C++ Error] sqlite3.h(1778): E2232 Constant member 'sqlite3 _index_info::aConstraint' in class without constructors [C++ Error] sqlite3.h(1778): E2232 Constant member 'sqlite3 _index_info::nOrderBy' in class without constructors [C++ Error] sqlite3.h(1778): E2232 Constant member 'sqlite3 _index_info::aOrderBy' in class without constructors [C++ Error] sqlite3.h(1778): E2232 Constant member 'sqlite3 _index_info::aConstraintUsage' in class without constructors -----------------------------8<--------------------------- offending code -----------------------------8<--------------------------- struct sqlite3_index_info { /* Inputs */ const int nConstraint; /* Number of entries in aConstraint */ const struct sqlite3_index_constraint { int iColumn; /* Column on left-hand side of constraint */ unsigned char op; /* Constraint operator */ unsigned char usable; /* True if this constraint is usable */ int iTermOffset; /* Used internally - xBestIndex should ignore */ } *const aConstraint; /* Table of WHERE clause constraints */ const int nOrderBy; /* Number of terms in the ORDER BY clause */ const struct sqlite3_index_orderby { int iColumn; /* Column number */ unsigned char desc; /* True for DESC. False for ASC. */ } *const aOrderBy; /* The ORDER BY clause */ /* Outputs */ struct sqlite3_index_constraint_usage { int argvIndex; /* if >0, constraint is part of argv to xFilter */ unsigned char omit; /* Do not code a test for this constraint */ } *const aConstraintUsage; int idxNum; /* Number used to identify the index */ char *idxStr; /* String, possibly obtained from sqlite3 _malloc */ int needToFreeIdxStr; /* Free idxStr using sqlite3_free() if true */ int orderByConsumed; /* True if output is already ordered */ double estimatedCost; /* Estimated cost of using this index */ }; -----------------------------8<--------------------------- I'll try compiling it using the command line compilor however, this won't rectify using it as a library (.lib) file. Obviously it doesn't like the use of const without initializing values for integer types. Suggestions welcome (I can post the entire .h file but that would be... rediculous?) I appreciate any help (and yes I am very tired). Stephen Back to top Chris Uzdavinis (TeamB) Guest Posted: Mon Apr 16, 2007 8:18 pm    Post subject: Re: BCB 5.0 UP1 ' Stephen Phillips <someone (AT) someplace (DOT) com> writes: Quote: I'm getting a few puzzling messages especially since this has extern "C" { } defined around it ... BCB's compilor assumes the rules of C++ it appears I think it's trying to be helpful, but isn't checking enough "stuff" before it decides the code is wrong. For example, if there are no constructors, but all data is public, it can still be initialized with aggregate initialization syntax. But BCB appears to have forgotten to check that case. Quote: -----------------------------8<--------------------------- [C++ Error] sqlite3.h(1778): E2232 Constant member 'sqlite3_index_info::nConstraint' in class without constructors struct sqlite3_index_info { /* Inputs */ const int nConstraint; /* Number of entries in aConstraint */ const struct sqlite3_index_constraint { int iColumn; /* Column on left-hand side of constraint */ unsigned char op; /* Constraint operator */ unsigned char usable; /* True if this constraint is usable */ int iTermOffset; /* Used internally - xBestIndex should ignore */ } *const aConstraint; /* Table of WHERE clause constraints */ Hmm, I'll have to think about it. Are you compiling the library yourself or trying to link to a binary with only a supplied header? -- Chris (TeamB); Back to top Chris Uzdavinis (TeamB) Guest Posted: Mon Apr 16, 2007 9:45 pm    Post subject: Re: BCB 5.0 UP1 ' Stephen Phillips <someone (AT) someplace (DOT) com> writes: Quote: Thanks for the ponderings. It compiles as itself (IE as the module) fine however linking it with the header file makes things go crazy. Unfortunatly, I cannot test with newer versions of BCB to see if this problem remains. If you don't force the header to have "C" linkage, you said it works? Can you simply build the library as C++ as well, and work around the problem that way? -- Chris (TeamB); Back to top Stephen Phillips Guest Posted: Mon Apr 16, 2007 9:57 pm    Post subject: Re: BCB 5.0 UP1 ' Chris Uzdavinis (TeamB) <chris (AT) uzdavinis (DOT) com> wrote in news:861wik2vr2.fsf (AT) explicit (DOT) atdesk.com: Quote: Stephen Phillips <someone (AT) someplace (DOT) com> writes: duplication truncated Hmm, I'll have to think about it. Are you compiling the library yourself or trying to link to a binary with only a supplied header? Here is the current 'state' the module sqlite3.c compiles fine however using the header file C++ spills it's guts all over me. :D That about sums things up. I am wondering if I need to make some changes to the compilor settings or start doing odd workarounds. It looks like it assumes (the compilor) that a struct is a class. This seems a bit ... odd for it's behavior. Thanks for the ponderings. It compiles as itself (IE as the module) fine however linking it with the header file makes things go crazy. :D Stephen Back to top Stephen Phillips Guest Posted: Tue Apr 17, 2007 8:10 am    Post subject: Re: BCB 5.0 UP1 C++ to C interface issues. Chris Uzdavinis (TeamB) <chris (AT) uzdavinis (DOT) com> wrote in news:86odlo1d5w.fsf (AT) explicit (DOT) atdesk.com: Quote: Stephen Phillips <someone (AT) someplace (DOT) com> writes: Unfortunatly, I cannot test with newer versions of BCB to see if this problem remains. If you don't force the header to have "C" linkage, you said it works? Can you simply build the library as C++ as well, and work around the problem that way? Well it builds fine as C code it uses this /* ** Make sure we can call this stuff from C++. */ #ifdef __cplusplus extern "C" { #endif The only fix for this problem is to rewrite the offending section of code, this will make it not conform to the proper typing conventions for the struct but it may actually 'accept it'. Since the module is compiled in C I can redefine it for __cplusplus only, and fix it. Although it seems a very lame way to fix something like this to be honest. Stephen Back to top Stephen Phillips Guest Posted: Thu Apr 19, 2007 1:54 am    Post subject: Re: BCB 5.0 UP1 ' Chris Uzdavinis (TeamB) <chris (AT) uzdavinis (DOT) com> wrote in news:86odlo1d5w.fsf (AT) explicit (DOT) atdesk.com: Quote: Unfortunatly, I cannot test with newer versions of BCB to see if this problem remains. If you don't force the header to have "C" linkage, you said it works? Can you simply build the library as C++ as well, and work around the problem that way? I broke down and removed the const statements and used an #ifdef __BCBPLUSPLUS__ as to use const or no const in the offending code. This rectifies the problem however I can't say I like it one bit. 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