* Empty element in CPATH variable
@ 2022-07-24 12:40 aiishymanel
2022-07-24 19:25 ` Jonathan Wakely
0 siblings, 1 reply; 2+ messages in thread
From: aiishymanel @ 2022-07-24 12:40 UTC (permalink / raw)
To: Gcc Help
Hi everyone,
the documentation explicitly states that empty elements in CPATH and other variables that control header search path can appear at thebeginning or end of a list.
https://gcc.gnu.org/onlinedocs/cpp/Environment-Variables.html
But in reality nothing stops you from putting empty element anywhere in the list.
export CPATH="$HOME/include::$HOME/project/include"
cpp -nostdinc /dev/null -o /dev/null -v 2>&1 | awk '/#include/,/End/'
#include "..." search starts here:
#include <...> search starts here:
/root/include
.
/root/project/include
End of search list.
In general I would not consider it to be a bug, but the accent on the beginning and end of the list makes me wonder it it is a bug or a bad description.
Thanks,
Andrii
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Empty element in CPATH variable
2022-07-24 12:40 Empty element in CPATH variable aiishymanel
@ 2022-07-24 19:25 ` Jonathan Wakely
0 siblings, 0 replies; 2+ messages in thread
From: Jonathan Wakely @ 2022-07-24 19:25 UTC (permalink / raw)
To: aiishymanel; +Cc: Gcc Help
On Sun, 24 Jul 2022, 13:41 aiishymanel--- via Gcc-help, <
gcc-help@gcc.gnu.org> wrote:
> Hi everyone,
>
> the documentation explicitly states that empty elements in CPATH and other
> variables that control header search path can appear at thebeginning or end
> of a list.
>
> https://gcc.gnu.org/onlinedocs/cpp/Environment-Variables.html
>
> But in reality nothing stops you from putting empty element anywhere in
> the list.
>
I think the idea is that it's obvious that "::" in the middle is an empty
path, but it's saying that it can also appear at the ends, like ":foo".
> export CPATH="$HOME/include::$HOME/project/include"
>
> cpp -nostdinc /dev/null -o /dev/null -v 2>&1 | awk '/#include/,/End/'
>
> #include "..." search starts here:
> #include <...> search starts here:
> /root/include
> .
> /root/project/include
> End of search list.
>
> In general I would not consider it to be a bug, but the accent on the
> beginning and end of the list makes me wonder it it is a bug or a bad
> description.
>
I suppose it could say empty elements can appear anywhere, including the
beginning or end.
> Thanks,
> Andrii
>
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