Error message formatting feature request

Error message formatting feature request

[Jeremiah Willcock]

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When compiling a program such as:

template <typename T>
void foo(T, typename T::type c) {c.y();}
struct x {typedef int type;};
void f() {foo(x(), 3);}

GCC 4.5.0 (correctly) produces the error message:

foo.cpp: In function Β‘void foo(T, typename T::type) [with T = x, typename 
T::type = int]Β’:
foo.cpp:4:21:   instantiated from here
foo.cpp:2:34: error: request for member Β‘yΒ’ in Β‘cΒ’, which is of non-class 
type Β‘x::typeΒ’

My feature request is to have the comma between "T = x" and "typename 
T::type = int" replaced by a semicolon.  In larger programs, the types 
given in the error message often themselves contain commas, while they do 
not typically contain semicolons.  Thus, this change would make the error 
messages easier to understand (and, in particular, to skim).

-- Jeremiah Willcock

Re: Error message formatting feature request

[Ian Lance Taylor]

Jeremiah Willcock <jewillco@osl.iu.edu> writes:

> When compiling a program such as:
>
> template <typename T>
> void foo(T, typename T::type c) {c.y();}
> struct x {typedef int type;};
> void f() {foo(x(), 3);}
>
> GCC 4.5.0 (correctly) produces the error message:
>
> foo.cpp: In function ‘void foo(T, typename T::type) [with T = x,
> typename T::type = int]’:
> foo.cpp:4:21:   instantiated from here
> foo.cpp:2:34: error: request for member ‘y’ in ‘c’, which is of
> non-class type ‘x::type’
>
> My feature request is to have the comma between "T = x" and "typename
> T::type = int" replaced by a semicolon.  In larger programs, the types
> given in the error message often themselves contain commas, while they
> do not typically contain semicolons.  Thus, this change would make the
> error messages easier to understand (and, in particular, to skim).

Thanks for the suggestion.  Please open a feature request at
http://gcc.gnu.org/bugzilla/ for this.  Otherwise I'm afraid this
suggestion will just be lost in the noise.

Ian