On Sun, 22 Jan 2012, Vincent Torri wrote:
when using AC_FUNC_ALLOCA, the autoconf documentation says that one should
paste some code. That code generates a warning because:
1) the doc says to paste
#elif defined __GNUC__
# define alloca __builtin_alloca
2) the MinGW-w64 compiler already defines alloca in malloc.h, that header
files being included by stdlib.h because STDC_HEADERS is defined.
I don't know how to properly fix the doc. One solution would be:
#elif defined __GNUC__
# ifndef alloca
# define alloca __builtin_alloca
# endif
what do you think ?
I think that your work-around is the safe approach and that the docs
should be fixed.
Other build environments (e.g. Solaris 10) also use a similar macro
definition and it becomes enabled by the compiler:
#define alloca(x) __builtin_alloca(x)
Bob
--
Bob Friesenhahn
bfriesen@xxxxxxxxxxxxxxxxxxx, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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