Hi Paul, > Eli Zaretskii wrote: > > #ifndef alloca > > # ifdef __GNUC__ > > -# define alloca __builtin_alloca > > +# if HAVE_ALLOCA_H > > +# include_next <alloca.h> > > +# else > > +# define alloca __builtin_alloca > > +# endif > > # elif defined _AIX > > Why do the 'include_next' only for GCC? Why not do it for all compilers?
'include_next' needs absolute file name for some compilers, and our mechanics for determining the absolute file name of a .h file does not work when the .h file defines only macros. See m4/include_next.m4: # Note: This macro assumes that the header file is not empty after # preprocessing, i.e. it does not only define preprocessor macros but also # provides some type/enum definitions or function/variable declarations. alloca.h unfortunately may be in this category. > Also, what platforms don't work with the current Gnulib alloca module, and > why? Yes, Eli, I'd like to know this as well: what is the proposed change doing to fix/improve? Bruno
