Gcc Error
Contents |
your program. GCC reports errors with the source file gcc warnings name and line number where the problem is gcc pragma warning apparent. Warnings report other unusual conditions in your code that may indicate a
Gcc Error Message Format
problem, although compilation can (and does) proceed. Warning messages also report the source file name and line number, but include the text
Gcc Errors List
‘warning:’ to distinguish them from error messages. Warnings may indicate danger points where you should check to make sure that your program really does what you intend; or the use of obsolete features; or the use of nonstandard features of GNU C or gcc error messages C++. Many warnings are issued only if you ask for them, with one of the -W options (for instance, -Wall requests a variety of useful warnings). GCC always tries to compile your program if possible; it never gratuitously rejects a program whose meaning is clear merely because (for instance) it fails to conform to a standard. In some cases, however, the C and C++ standards specify that certain extensions are forbidden, and a diagnostic must be issued by a conforming compiler. The -pedantic option tells GCC to issue warnings in such cases; -pedantic-errors says to make them errors instead. This does not mean that all non-ISO constructs get warnings or errors. See Options to Request or Suppress Warnings, for more detail on these and related command-line options.
…and How-to Solve The Problem1.1 Compilation Errors1.1.1 Error: …discards qualifiers1.1.2 Error: storage size of ‘foo' isn't known1.1.3 Error: multiple types in one declaration1.1.4 Error: invalid use of undefined type ‘struct Foo’1.1.5 Error: no matching
Gcc Flags
function for call to ‘FooClass::foo()'1.1.6 Error: undefined reference to ‘FooClass::foo()'1.1.7 Error: invalid gcc fatal error operands of types `const char[31]' and `const char[7]' to binary `operator+'1.1.8 Error: `QValueList' undeclared (first use this function)1.1.9 Error: cannot gcc #error call member function `Foo* Foo::instance() const' without object1.1.10 Errors: non-pointer type, non-aggregate type, cannot convert1.1.11 Error: syntax error before `*' token1.1.12 Error: `foo' is not a type1.1.13 Error: unable to find a https://gcc.gnu.org/onlinedocs/gcc/Warnings-and-Errors.html register to spill in class `FOO'1.1.14 Error: invalid operands to binary ‘operator<<‘1.2 Qt Peculiarities1.2.1 Using Qt - invalid use of void expression1.2.2 Using Qt - …before ‘protected’1.2.3 Using Qt - …vtable1.3 Serious Warnings1.3.1 Warning: Control reaches the end of a non-void function1.3.2 Warning: ‘foo’ is used uninitialized in this function1.3.3 Warning: cannot pass objects of non-POD type ‘struct std::string' through ‘…' This page has been http://digitalfanatics.org/resources/gcc-error-messages/ converted from a Wiki formatted article. If I've missed anything in the conversion process, please tell. Sometimes GCC emits something that can be described as Haiku poems - and you have no clue as to what it really is complaining about. This page is a collection of such gems, their meaning in English and how to solve the problem. If you run into an error that you feel belongs here, feel free to mail me. I'm using GMail as e8johan. Compilation Errors This is a list of compilation errors that you might find yourself trying to interpret in no particular order. Error: …discards qualifiers Error message: passing ‘const ClassName’ as ‘this’ argument of ‘virtual void ClassName::methodName()’ discards qualifiers. You have called a method that isn't const using a const object (const ClassName *foo). Either add const to you method, e.g. class ClassName
{
public:
void methodName() const;
}; Alternatively, you remove the const from your object, declaring it as ClassName *foo instead of const ClassName *foo. Sometimes it is possible to solve this issue using const_cast (thanks Witold). Refer to this DevX article for an example of this. Error: s
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