Comment on web page https://gcc.gnu.org/projects/cxx-status.html#cxx11

Comment on web page https://gcc.gnu.org/projects/cxx-status.html#cxx11

[Dr. Jürgen Sauermann]

Hi,

not sure if this matters or how int can be fixed, but today I observed 
the following:

Your web page says that "Static assertions" are supported by GCC since 
version 4.3.

Today I tried to use "Static assertions" on an  avr-g++ resp. avr-gcc 
which identifies
itself as:

eedjsa@server68:~/projects/AVR_workspace/ATMEGA8U2_32U2$ avr-g++ --version
avr-g++ (GCC) 5.4.0
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

eedjsa@server68:~/projects/AVR_workspace/ATMEGA8U2_32U2$ avr-gcc --version
avr-gcc (GCC) 5.4.0
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

but it seems not to support static assertions.

The "regular" g++ works:

eedjsa@server68:~/projects/AVR_workspace/ATMEGA8U2_32U2$ echo '
static_assert(0, "error"); int main() {}' | g++ -S -o /dev/null -x c++ -
<stdin>:2:15: error: static assertion failed: error

while the avr-g++ fails:

eedjsa@server68:~/projects/AVR_workspace/ATMEGA8U2_32U2$ echo '
static_assert(0, "error"); int main() {}' | avr-g++ -S -o /dev/null -x c++ -
<stdin>:2:14: error: expected constructor, destructor, or type 
conversion before ‘(’ token

Maybe this should be mentioned on the web page.

Best Regards,
Jürgen Sauermann

Re: Comment on web page https://gcc.gnu.org/projects/cxx-status.html#cxx11

[Jonathan Wakely]

On Fri, 3 Dec 2021, 18:58 Dr. Jürgen Sauermann, <mail@juergen-sauermann.de>
wrote:

> Hi,
>
> not sure if this matters or how int can be fixed, but today I observed
> the following:
>
> Your web page says that "Static assertions" are supported by GCC since
> version 4.3.
>
> Today I tried to use "Static assertions" on an  avr-g++ resp. avr-gcc
> which identifies
> itself as:
>
> eedjsa@server68:~/projects/AVR_workspace/ATMEGA8U2_32U2$ avr-g++ --version
> avr-g++ (GCC) 5.4.0
> Copyright (C) 2015 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions.  There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
>
> eedjsa@server68:~/projects/AVR_workspace/ATMEGA8U2_32U2$ avr-gcc --version
> avr-gcc (GCC) 5.4.0
> Copyright (C) 2015 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions.  There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
>
> but it seems not to support static assertions.
>
> The "regular" g++ works:
>
> eedjsa@server68:~/projects/AVR_workspace/ATMEGA8U2_32U2$ echo '
> static_assert(0, "error"); int main() {}' | g++ -S -o /dev/null -x c++ -
> <stdin>:2:15: error: static assertion failed: error
>
> while the avr-g++ fails:
>
> eedjsa@server68:~/projects/AVR_workspace/ATMEGA8U2_32U2$ echo '
> static_assert(0, "error"); int main() {}' | avr-g++ -S -o /dev/null -x c++
> -
> <stdin>:2:14: error: expected constructor, destructor, or type
> conversion before ‘(’ token
>
> Maybe this should be mentioned on the web page.
>


Static assertions are a C++11 feature, so you simply need to use -std=c++11
or -std=gnu++11

Re: Comment on web page https://gcc.gnu.org/projects/cxx-status.html#cxx11

[Dr. Jürgen Sauermann]

On 12/3/21 9:12 PM, Jonathan Wakely wrote:
>
>
> On Fri, 3 Dec 2021, 18:58 Dr. Jürgen Sauermann, 
> <mail@juergen-sauermann.de <mailto:mail@juergen-sauermann.de>> wrote:
>
>     Hi,
>
>     not sure if this matters or how int can be fixed, but today I
>     observed
>     the following:
>
>     Your web page says that "Static assertions" are supported by GCC
>     since
>     version 4.3.
>
>     Today I tried to use "Static assertions" on an  avr-g++ resp. avr-gcc
>     which identifies
>     itself as:
>
>     eedjsa@server68:~/projects/AVR_workspace/ATMEGA8U2_32U2$ avr-g++
>     --version
>     avr-g++ (GCC) 5.4.0
>     Copyright (C) 2015 Free Software Foundation, Inc.
>     This is free software; see the source for copying conditions. 
>     There is NO
>     warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
>     PURPOSE.
>
>     eedjsa@server68:~/projects/AVR_workspace/ATMEGA8U2_32U2$ avr-gcc
>     --version
>     avr-gcc (GCC) 5.4.0
>     Copyright (C) 2015 Free Software Foundation, Inc.
>     This is free software; see the source for copying conditions. 
>     There is NO
>     warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
>     PURPOSE.
>
>     but it seems not to support static assertions.
>
>     The "regular" g++ works:
>
>     eedjsa@server68:~/projects/AVR_workspace/ATMEGA8U2_32U2$ echo '
>     static_assert(0, "error"); int main() {}' | g++ -S -o /dev/null -x
>     c++ -
>     <stdin>:2:15: error: static assertion failed: error
>
>     while the avr-g++ fails:
>
>     eedjsa@server68:~/projects/AVR_workspace/ATMEGA8U2_32U2$ echo '
>     static_assert(0, "error"); int main() {}' | avr-g++ -S -o
>     /dev/null -x c++ -
>     <stdin>:2:14: error: expected constructor, destructor, or type
>     conversion before ‘(’ token
>
>     Maybe this should be mentioned on the web page.
>
>
>
> Static assertions are a C++11 feature, so you simply need to use 
> -std=c++11 or -std=gnu++11
>
>
Hi Jonathan,

thanks a lot. This works indeed, even with avr-gcc/g++.