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digitalmars.D - Help for .h to D pain?

reply jfd <jfd nospam.com> writes:
I was trying to translate Apache module include files to D, but it soon leads
to a labyrinth of tangled nested #includes and #define and typedef's.  The
tools, `dmc -c -e -l', htod, etc. immediately choked.  It is getting really,
really,... time consuming, and the words "man years" flashes before my eyes
:O...  I'm beginning to see why C++ supports the .h's... after years of
knocking it... :(

There's gotta be a easier way... Help me!...

DMC is spewing out errors:

-----------------------------------------
$ dmc -I. -c httpd.h -e -l
#define __STDC_IEC_559__
                       ^
features.h(327) : Preprocessor error: macro '__STDC_IEC_559__' can't be #undef'd
 or #define'd
#define __STDC_IEC_559_COMPLEX__
                               ^
features.h(328) : Preprocessor error: macro '__STDC_IEC_559_COMPLEX__' can't be
#undef'd or #define'd
typedef __signed__ char
                      ^
asm-generic/int-ll64.h(19) : Error: '=', ';' or ',' expected
typedef __signed__ short __s16;
                             ^
asm-generic/int-ll64.h(22) : Error: illegal combination of types
typedef __signed__ int __s32;
                           ^
asm-generic/int-ll64.h(25) : Error: illegal combination of types
Fatal error: too many errors
--- errorlevel 1
-----------------------------------------

HTOD too:

-----------------------------------------
$ htod httpd.h
Fatal error: unable to open input file 'features.h'

$ htod -I. httpd.h
#define __STDC_IEC_559__                1
                       ^
features.h(327) : Preprocessor error: macro '__STDC_IEC_559__' can't be #undef'd
 or #define'd
#define __STDC_IEC_559_COMPLEX__        1
                               ^
features.h(328) : Preprocessor error: macro '__STDC_IEC_559_COMPLEX__' can't be
#undef'd or #define'd
Fatal error: unable to open input file 'stddef.h'
-----------------------------------------

And what tool is there on Linux?

Hey, here's a crazy idea: Why not support #include "x.h"?  Now that's
"seamless"!  That's ONLY, and I emphasize ONLY (before someone goes nuts with
it), for supporting existing C libraries, not for general D programming.
Internally, it would import everything in .h that it reads as `extern(C)'
objects for D, or something like that.

LLVM has C compiler, right?  Why not borrow its header file parser (if license
allows)?

BTW, LDC and clang LLVM C compiler both compile to LLVM, so they should be
able to read each other's stuff, right?  That maybe a discussion more for the
LDC forums, but it also would involve D language change.

I'm okay with a "standard tool" instead of new "language feature", if that
tool makes it EEEASY..., and works "flawlessly" and "seamlessly" on Linux,
Windows, Mac, etc.  Hey, maybe that's beginning to sound like a big project in
itself, close to a full C compiler... :)

Help, anyone?  Thank you.
Nov 11 2010
next sibling parent reply div0 <div0 sourceforge.net> writes:
On 12/11/2010 04:01, jfd wrote:

 Help, anyone?  Thank you.


The easiest way is to simply compile a one liner C module.
Then you get all the necessary stuff included and all the irritating 
macros stripped out and converted to what they are actually supposed to 
be. You can then probably run htod successfully; even if not it's much 
easier converting the code by hand.

-- 
My enormous talent is exceeded only by my outrageous laziness.
http://www.ssTk.co.uk
Nov 12 2010
parent reply div0 <div0 sourceforge.net> writes:
On 12/11/2010 13:21, div0 wrote:

 On 12/11/2010 04:01, jfd wrote:

 Help, anyone? Thank you.


 The easiest way is to simply compile a one liner C module.
 Then you get all the necessary stuff included and all the irritating
 macros stripped out and converted to what they are actually supposed to
 be. You can then probably run htod successfully; even if not it's much
 easier converting the code by hand.


Doh, I forgot the most important bit:
Use the keep preprocessed file option of your compiler.

for gcc I think it's -E; in visual studio it's one of the options on the 
Preprocessor properties page.

-- 
My enormous talent is exceeded only by my outrageous laziness.
http://www.ssTk.co.uk
Nov 12 2010
parent jfd <jfd nospam.com> writes:
== Quote from div0 (div0 sourceforge.net)'s article

 On 12/11/2010 13:21, div0 wrote:

 On 12/11/2010 04:01, jfd wrote:

 Help, anyone? Thank you.


 The easiest way is to simply compile a one liner C module.
 Then you get all the necessary stuff included and all the irritating
 macros stripped out and converted to what they are actually supposed to
 be. You can then probably run htod successfully; even if not it's much
 easier converting the code by hand.


 Doh, I forgot the most important bit:
 Use the keep preprocessed file option of your compiler.
 for gcc I think it's -E; in visual studio it's one of the options on the
 Preprocessor properties page.


This LLVM video at GoogleTechTalks illustrates my "pain index" -- in charts!

Please see video starting at time 0:38:14:

http://www.youtube.com/watch?v=VeRaLPupGks

Thanks for the help!
Nov 12 2010
prev sibling parent Matthias Pleh <sufu alter.com> writes:
Am 12.11.2010 05:01, schrieb jfd:

 I was trying to translate Apache module include files to D, but it soon leads
 to a labyrinth of tangled nested #includes and #define and typedef's.  The
 tools, `dmc -c -e -l', htod, etc. immediately choked.  It is getting really,
 really,... time consuming, and the words "man years" flashes before my eyes
 :O...  I'm beginning to see why C++ supports the .h's... after years of
 knocking it... :(

 There's gotta be a easier way... Help me!...

 DMC is spewing out errors:

 -----------------------------------------
 $ dmc -I. -c httpd.h -e -l
 #define __STDC_IEC_559__
                         ^
 features.h(327) : Preprocessor error: macro '__STDC_IEC_559__' can't be
#undef'd
   or #define'd
 #define __STDC_IEC_559_COMPLEX__
                                 ^
 features.h(328) : Preprocessor error: macro '__STDC_IEC_559_COMPLEX__' can't be
 #undef'd or #define'd
 typedef __signed__ char
                        ^
 asm-generic/int-ll64.h(19) : Error: '=', ';' or ',' expected
 typedef __signed__ short __s16;
                               ^
 asm-generic/int-ll64.h(22) : Error: illegal combination of types
 typedef __signed__ int __s32;
                             ^
 asm-generic/int-ll64.h(25) : Error: illegal combination of types
 Fatal error: too many errors
 --- errorlevel 1
 -----------------------------------------

 HTOD too:

 -----------------------------------------
 $ htod httpd.h
 Fatal error: unable to open input file 'features.h'

 $ htod -I. httpd.h
 #define __STDC_IEC_559__                1
                         ^
 features.h(327) : Preprocessor error: macro '__STDC_IEC_559__' can't be
#undef'd
   or #define'd
 #define __STDC_IEC_559_COMPLEX__        1
                                 ^
 features.h(328) : Preprocessor error: macro '__STDC_IEC_559_COMPLEX__' can't be
 #undef'd or #define'd
 Fatal error: unable to open input file 'stddef.h'
 -----------------------------------------

 And what tool is there on Linux?

 Hey, here's a crazy idea: Why not support #include "x.h"?  Now that's
 "seamless"!  That's ONLY, and I emphasize ONLY (before someone goes nuts with
 it), for supporting existing C libraries, not for general D programming.
 Internally, it would import everything in .h that it reads as `extern(C)'
 objects for D, or something like that.

 LLVM has C compiler, right?  Why not borrow its header file parser (if license
 allows)?

 BTW, LDC and clang LLVM C compiler both compile to LLVM, so they should be
 able to read each other's stuff, right?  That maybe a discussion more for the
 LDC forums, but it also would involve D language change.

 I'm okay with a "standard tool" instead of new "language feature", if that
 tool makes it EEEASY..., and works "flawlessly" and "seamlessly" on Linux,
 Windows, Mac, etc.  Hey, maybe that's beginning to sound like a big project in
 itself, close to a full C compiler... :)

 Help, anyone?  Thank you.



I've found this tool very usefull to translate C/C++ files to d
http://www.cabaret.demon.co.uk/filepp/

It's just a preprocessor, but gives very nice output!
(much nicier than g++, dmc or cl)
Afterwards you can use htod, or translate by hand.

greets
Matthias
Nov 13 2010