On Mon, 26 Apr 2004, D. Richard Hipp wrote: ~ If I make use of alloca() in SQLite version 3, will this ~ cause any extreme hardships? Who is using a C compiler to ~ build SQLite that does not support alloca()?
I have been avoiding using it for my programs heeding the following warnings from the man pages: NOTES ON THE GNU VERSION Normally, gcc translates calls to alloca by inlined code. This is not done when either the -ansi or the -fno-builtin option is given. But beware! By default the glibc version of <stdlib.h> includes <alloca.h> and that contains the line # define alloca(size) __builtin_alloca (size) with messy consequences if one has a private version of this function. The fact that the code is inlined, means that it is impossible to take the address of this function, or to change its behaviour by linking with a different library. The inlined code often consists of a single instruction adjusting the stack pointer, and does not check for stack overflow. Thus, there is no NULL error return. BUGS The alloca function is machine and compiler dependent. On many systems its implementation is buggy. Its use is discouraged. On many systems alloca cannot be used inside the list of arguments of a function call, because the stack space reserved by alloca would appear on the stack in the middle of the space for the function arguments. -- Amit Upadhyay --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
