Re: [RFA/mingw32] environment variables are case-insensitive on win32

Corinna Vinschen
2012-12-10T16:17:48Z

On Dec 10 18:09, Eli Zaretskii wrote:
> > Date: Mon, 10 Dec 2012 16:57:52 +0100
> > From: Corinna Vinschen <vinschen@redhat.com>
> >
> > On Dec 10 16:42, Jerome Guitton wrote:
> > > Corinna Vinschen (vinschen@redhat.com):
> > >
> > > > Cygwin is not Windows. Cygwin is a UNIX-like system like Linux,
> > > > Solaris, OpenBSD, etc. The question you should ask is this: Would
> > > > you like to match environment variable names case-insensitive on Linux,
> > > > Solaris, OpenBSD? If the answer is "no", the answer for Cygwin is "no",
> > > > too.
> > >
> > > Something may be broken in Cygwin's GDB, or maybe my version of Cygwin
> > > is too old, because environment variables that have the same names are
> > > identified in the inferior:
> > >
> > > guitton@kerel ~
> > > $ export TEST_GDB_V=1
> > > guitton@kerel ~
> > > $ export TEST_GDB_v=2
> > >
> > > guitton@kerel ~
> > > $ env | grep TEST_GDB
> > > TEST_GDB_V=1
> > > TEST_GDB_v=2
> > >
> > > guitton@kerel ~
> > > $ /bin/gdb ./gdb/testsuite/gdb.base/testenv.exe
> > > [...]
> > > (gdb) r
> > > Starting program: /home/guitton/GIT/GDB/builds/obj.gdb-fsf.cygwin/gdb/testsuite/gdb.base/testenv.exe
> > > [New thread 12692.0x16ac]
> > > [New thread 12692.0x22b0]
> > > TEST_GDB_V=2
> > > Program found 1 variables starting with TEST_GDB
> >
> > Probably an old Cygwin version. Older versions of Cygwin did not
> > honor the case of env vars, but rather converted them all to uppercase,
> > but this is pre-2008!
> >
> > I don't have GDB test environment set up, but this works for me with the
> > most recent Cygwin version 1.7.18:
>
> If some versions of Cygwin are case-insensitive in this context, while
> others aren't, then a run-time test of the kind coded by Jerome is
> _exactly_ the Right Thing.

These old versions are not at all supported anymore. The right thing to
do in this case is update.

Corinna

--
Corinna Vinschen
Cygwin Project Co-Leader
Red Hat