llvm dev - Jun 2008 - [LLVMdev] The first two lines of llvm tutorial don't compile.

I took the first two lines of the sample program in the tutorial:


hendrik at lovesong:~/dv/lang/hlvm$ cat broken.cpp 
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
hendrik at lovesong:~/dv/lang/hlvm$


and tried to compile them using the llvm-dev in Debian testing:


hendrik at lovesong:~/dv/lang/hlvm$ g++ -o broken.o -c broken.cpp
In file included from /usr/include/llvm/Type.h:16,
                 from /usr/include/llvm/DerivedTypes.h:21,
                 from broken.cpp:1:
/usr/include/llvm/Support/DataTypes.h:38:3: error: #error "Must #define
__STDC_LIMIT_MACROS before #including Support/DataTypes.h"
hendrik at lovesong:~/dv/lang/hlvm$


Did I do something wrong, or is something broken? In llvm or in g++?


hendrik at lovesong:~/dv/lang/hlvm$ g++ --version
g++ (GCC) 4.2.4 (Debian 4.2.4-1)
Copyright (C) 2007 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

hendrik at lovesong:~/dv/lang/hlvm$ 



-- hendrik

You need to use the script 'llvm-config' to pass correct arguments to g 
++:

g++ -o broken.o `llvm-config --cxxflags` broken.cpp


On Jun 2, 2008, at 9:43 AM, Hendrik Boom wrote:
> I took the first two lines of the sample program in the tutorial:
>
>
> hendrik at lovesong:~/dv/lang/hlvm$ cat broken.cpp
> #include "llvm/DerivedTypes.h"
> #include "llvm/Module.h"
> hendrik at lovesong:~/dv/lang/hlvm$
>
>
> and tried to compile them using the llvm-dev in Debian testing:
>
>
> hendrik at lovesong:~/dv/lang/hlvm$ g++ -o broken.o -c broken.cpp
> In file included from /usr/include/llvm/Type.h:16,
>                 from /usr/include/llvm/DerivedTypes.h:21,
>                 from broken.cpp:1:
> /usr/include/llvm/Support/DataTypes.h:38:3: error: #error "Must  
> #define __STDC_LIMIT_MACROS before #including Support/DataTypes.h"
> hendrik at lovesong:~/dv/lang/hlvm$
>
>
> Did I do something wrong, or is something broken? In llvm or in g++?
>
>
> hendrik at lovesong:~/dv/lang/hlvm$ g++ --version
> g++ (GCC) 4.2.4 (Debian 4.2.4-1)
> Copyright (C) 2007 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions.  There  
> is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR  
> PURPOSE.
>
> hendrik at lovesong:~/dv/lang/hlvm$
>
>
>
> -- hendrik
>
>
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev

On Jun 2, 2008, at 9:43 AM, Hendrik Boom wrote:
> I took the first two lines of the sample program in the tutorial:
> /usr/include/llvm/Support/DataTypes.h:38:3: error: #error "Must  
> #define __STDC_LIMIT_MACROS before #including Support/DataTypes.h"
The #error is unfortunate.  It all comes about because the C standards  
committee tried to define C++ and they got it wrong.  Then this wrong  
concept was burned into stdint.h, for poor project folks to deal with.

 From the header itself:

// Note that this header's correct operation depends on  
__STDC_LIMIT_MACROS
// being defined.  We would define it here, but in order to prevent  
Bad Things
// happening when system headers or C++ STL headers include stdint.h  
before
// we define it here, we define it on the g++ command line (in  
Makefile.rules).
#if !defined(__STDC_LIMIT_MACROS)
# error "Must #define __STDC_LIMIT_MACROS before #including Support/ 
DataTypes.h"
#endif

So, for now, it looks like you have to define the on the command  
line.  :-(


This code is bogus however, working stdint.h files don't need this  
defined and checking it like this is wrong.

On Mon, 02 Jun 2008 09:52:16 -0700, Thomas Hudson wrote:
> You need to use the script 'llvm-config' to pass correct arguments
to g
> ++:
> 
> g++ -o broken.o `llvm-config --cxxflags` broken.cpp
> 
> 
Interesting.  When I type the command as you provided it (using cut-and-paste) I
get:


hendrik at lovesong:~/dv/lang/hlvm$ g++ -o broken.o `llvm-config --cxxflags`
broken.cpp
g++: (Debian: No such file or directory
g++: 2.2-7): No such file or directory
hendrik at lovesong:~/dv/lang/hlvm$ 


So I execute the script by itself, and get


hendrik at lovesong:~/dv/lang/hlvm$ llvm-config --cxxflags
-I/usr/include/llvm  -D_DEBUG  -D_GNU_SOURCE -D__STDC_LIMIT_MACROS -O2
-fomit-frame-pointer -DLLVM_DEBIAN_INFO= (Debian 2.2-7) -Woverloaded-virtual
hendrik at lovesong:~/dv/lang/hlvm$ 


Putting that output into the command, and removing the
-DLLVM_DEBIAN_INFO= (Debian 2.2-7) from it, things work
as well as one might expect for a program without main():


hendrik at lovesong:~/dv/lang/hlvm$ g++ -o broken.o -I/usr/include/llvm 
-D_DEBUG  -D_GNU_SOURCE -D__STDC_LIMIT_MACROS -O2 -fomit-frame-pointer
-Woverloaded-virtual
broken.cpp/usr/lib/gcc/i486-linux-gnu/4.2.4/../../../../lib/crt1.o: In function
`_start':
(.text+0x18): undefined reference to `main'
collect2: ld returned 1 exit status
hendrik at lovesong:~/dv/lang/hlvm$ 


Do you suppose a bug should be logged against the Debian package?

-- hendrik