std::runtime_error on std::locale("")

[Takashi Yano]

On Fri, 22 Sep 2023 08:48:45 +0200
ASSI  wrote:
> Takashi Yano via Cygwin writes:
> > I wonder why the following code throws std::runtime_error
> > even though the LC_ALL is set to valid locale other than "C".
> > This does not occur only when LC_ALL is set to "C".
> 
> This functionality is currently only supported for Glibc targets in
> libstdc++.  I seem to remember that I've looked into this some time ago,
> but there didn't seem to be an easy way of enabling it for Cygwin at
> that time.

Thanks for the answer.

It might not be an easy way, but I tried to enabling the locale
feature for libstdc++.

Please try:

1) Run cygport gcc prep
2) Remove libstdc++-v3/config/locale/generic
3) Copy libstdc++-v3/config/locale/gnu to libstdc++-v3/config/locale/generic
4) Apply patches attached to the working source directory.
5) Run cygport gcc compile

I also tried to automate above steps in gcc.cygport.

Further, I tested and confirmed that a few test cases works as expected.

What do you think of this idea?

-- 
Takashi Yano <takashi.yano@nifty.ne.jp>
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