llvm dev - Mar 2008 - [LLVMdev] Subversion head: build problem on cygwin?

Not sure if this is me or not, because this is the first time I've built 
LLVM on Cygwin, but I can't get a working compile.  I've configured with
the following options:

$ ./configure --with-llvmgccdir=/cygdrive/i/Projects/llvm-gcc4.2-2.2 
--enable-debug-runtime --enable-jit --enable-targets=x86

Configure doesn't suggest there's anything wrong, but when I try make, I
almost immediately get the following error:

make[1]: Entering directory `/cygdrive/i/Projects/llvm/lib/System'
llvm[1]: Compiling Path.cpp for Debug build
In file included from Path.cpp:201:
Unix/Path.inc: In static member function `static llvm::sys::Path 
llvm::sys::Path::GetMainExecutable(const char*, void*)':
Unix/Path.inc:256: error: `Dl_info' undeclared (first use this function)
Unix/Path.inc:256: error: (Each undeclared identifier is reported only 
once for each function it appears in.)
Unix/Path.inc:256: error: expected `;' before "DLInfo"
Unix/Path.inc:257: error: `DLInfo' undeclared (first use this function)
Unix/Path.inc:257: error: `dladdr' undeclared (first use this function)
make[1]: *** [/cygdrive/i/Projects/llvm/lib/System/Debug/Path.o] Error 1
make[1]: Leaving directory `/cygdrive/i/Projects/llvm/lib/System'
make: *** [all] Error 1

I have svn revision 48243, a relatively recent cygwin (1.5.24-2) with 
gcc 3.4.4 (i.e. not the 3.3.3 version described in the docs as not 
working), and WinXP.

Any ideas?

Hi, Jules.

On Tue, March 11, 2008 2:14 pm, Jules wrote:
> Not sure if this is me or not, because this is the first time I've
built
> LLVM on Cygwin, but I can't get a working compile.
Last I checked, LLVM-on-Cygwin has at least two problems, and you've hit
one of them.  Working around them isn't too bad, though patches to fix
them would be appreciated.
> llvm::sys::Path::GetMainExecutable(const char*, void*)':
> Unix/Path.inc:256: error: `Dl_info' undeclared (first use this
function)
> Unix/Path.inc:256: error: (Each undeclared identifier is reported only
> once for each function it appears in.)
> Unix/Path.inc:256: error: expected `;' before "DLInfo"
> Unix/Path.inc:257: error: `DLInfo' undeclared (first use this function)
> Unix/Path.inc:257: error: `dladdr' undeclared (first use this function)
> ...
> Any ideas?
What LLVM is trying to do here is determine its own path.  I don't know
if the approach being used will work on Cygwin.  (The code is very new,
and it's never worked on Cygwin.)  You could try reading the
/proc/$$/exe symlink.  I don't know how long Cygwin has been emulating
/proc, though.

Once you get past that, the other build errors you'll get will be due to
code assuming that uint32_t is typedefed to int.  On 32-bit Cygwin, it's
typedefed to long.  (They're the same size, but it still confuses the
compiler.)  This is an on-going problem, and I only use Cygwin in a
pinch, so I've just modified the 32-bit typedefs in my
/usr/include/stdint.h file.  I've chosen to fight other battles.  :)

Hope this helps.

Sam

Sam Bishop wrote:
> What LLVM is trying to do here is determine its own path.  I don't know
> if the approach being used will work on Cygwin.  (The code is very new,
> and it's never worked on Cygwin.)  You could try reading the
> /proc/$$/exe symlink.  I don't know how long Cygwin has been emulating
> /proc, though.
The dladdr() code won't work on Cygwin; the function isn't available. 
  However, I've attached a (tested) patch which implements the 
/proc/$$/exe approach.
> Once you get past that, the other build errors you'll get will be due
to
> code assuming that uint32_t is typedefed to int.  On 32-bit Cygwin,
it's
> typedefed to long.  (They're the same size, but it still confuses the
> compiler.)  This is an on-going problem, and I only use Cygwin in a
> pinch, so I've just modified the 32-bit typedefs in my
> /usr/include/stdint.h file.  I've chosen to fight other battles.  :)
LLVM compiles fine with my stdint.h changes, for what that's worth.

Sam
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Sam Bishop wrote:
> Once you get past that, the other build errors you'll get will be due
to
> code assuming that uint32_t is typedefed to int.  On 32-bit Cygwin,
it's
> typedefed to long.  (They're the same size, but it still confuses the
> compiler.)  This is an on-going problem, and I only use Cygwin in a
> pinch, so I've just modified the 32-bit typedefs in my
> /usr/include/stdint.h file.  I've chosen to fight other battles.  :)
>   
I think I'm with you.  It's not like I can't run a Linux virtual
machine
on this hardware. :)