[llvm-dev] error building LLVM opt tool under Cygwin

[Rui Ueyama via llvm-dev]

On Thu, Feb 28, 2019 at 3:15 PM Eli Friedman via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> > -----Original Message-----
> > From: llvm-dev <llvm-dev-bounces at lists.llvm.org> On Behalf Of s n via
> llvm-dev
> > Sent: Wednesday, February 27, 2019 9:31 PM
> > To: llvm-dev at lists.llvm.org
> > Subject: [EXT] [llvm-dev] error building LLVM opt tool under Cygwin
> >
> > Hello, I downloaded and built llvm-7.0.1 as per the instructions on the
> > website docs. It seems that I can run many of the tools in build/bin (eg
> > llvm-diff or count etc) with the exception of opt where I get "-bash:
> > ./opt.exe: cannot execute binary file: Exec format error". I tried
> > rebuilding just opt but still no luck. An ideas?
>
> "Exec format error" means the file is corrupted, or not an executable.
> Not sure how you would get that result without the build producing some
> sort of error message.  You could try "file opt.exe" to rule out the
> possibility that it's something that isn't an executable.  Maybe try
> cleaning and rebuilding.  Also, use a verbose build ("make VERBOSE=1" or
> "ninja -v") to see the command that actually produces opt.exe.
>

When the disk is almost full, some tools create broken executable. I don't
know if this is the case though. (If that's the case, you need to delete
files to fix it.)

In general, Cygwin is not well tested; if you can, I'd recommend using
> mingw or Visual Studio instead.
>
> >
> > This is frustrating because opt is the tool I am most interested in, and
> > the reason I built llvm at all instead of relying on the binary
> > distribution.
> >
> > On a somewhat unrelated note, what does make install actually do. I ran
> > "cmake -DMAKE_INSTALL_PREFIX=..../llvm-project/install -P
> > cmake_Install.cmake" and it ran for a long time, but I couldn't tell
> > what it actually did. eg I couldn't see any directory called
> > ..../llvm=project/install"
>
> The correct option is "-DCMAKE_INSTALL_PREFIX=..."; like you would expect,
> it's supposed to set the install prefix.
>
> -Eli
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