Hello, `-fdirectives-only' handles directives, but not macros. I am looking for the something like the opposite: expand macros, and include and defined directives, but leave currently undefined directives (and do preprocessing steps prior to handling macros and directives). So that compiling the header foobar.h with -x c-header /*This is foobar.h*/ #include "incl.h" #define DEFINED #if defined DEFINED #endif /*This is incl.h*/ #if defined UNDEFINED #endif would yield: # 1 "foobar.h" # 1 "<built-in>" # 1 "<command-line>" # 1 "foobar.h" # 1 "incl.h" 1 #if defined UNDEFINED #endif # 3 "foobar.h" 2 Is there anything like that, or close, or do I have to modify the sources and recompile gcc myself? It seems that it would be a useful option. What you could do with it, is "precompile" each header file, not in the sense currently used, but in such a way that you could then for each #include "foobar.h" line in a C/C++ source file, include the "precompiled" header instead, and the result of the compilation of the C/C++ source would be the same. Does this make sense? Thank you for any insight, Mark Galeck
