This seems to work on my system: gcc -E -x c myheader.h An odd thing I noticed about cpp is that it appears to be a wrapper for gcc on Darwin: cpp --version powerpc-apple-darwin8-gcc-4.0.1 (GCC) 4.0.1 (Apple Computer, Inc. build 5367) Copyright (C) 2005 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. Ruben On 13/04/2007, at 12:01 PM, Duncan Coutts wrote:
On Fri, 2007-04-13 at 11:09 +1000, Ruben Zilibowitz wrote:
All these seemed to work except for 2. In the c2hs output it says: cpp -x c ... not: cpp -x -c ... I think that might be a key issue.
Doh! That was my mistake. :-) It really should be "-x c" not "-x -c". The latter means something totally different :-)
Sorry, could you try again with my mistake corrected.
Here's an excerpt from the cpp man page on my system:
-x c -x c++ -x objective-c -x assembler-with-cpp Specify the source language: C, C++, Objective-C, or assembly. This has nothing to do with standards conformance or extensions; it merely selects which base syntax to expect. If you give none of these options, cpp will deduce the language from the extension of the source file: .c, .cc, .m, or .S. Some other common extensions for C++ and assembly are also recognized. If cpp does not recognize the extension, it will treat the file as C; this is the most generic mode.
I thought this -x c feature was portable, where as relying on cpp to default to C mode for a .h file seems much less so. Perhaps we should just spit out a .c file instead of a .h file. It wouldn't make much difference to c2hs as far as I can see.
Duncan