[patch][doc] Document JMP_BUF_SIZE

[Steven Bosscher]

Hello,

Documentation for this target macro is missing.
This patch adds it.  OK for trunk?

Ciao!
Steven

        * doc/tm.texi.in: Document JMP_BUF_SIZE.
        * doc/tm.texi: Regenerate.



Index: doc/tm.texi.in
===================================================================
--- doc/tm.texi.in      (revision 188917)
+++ doc/tm.texi.in      (working copy)
@@ -8856,6 +8856,14 @@ should use the @code{setjmp}/@code{longjmp} functi
 instead of the @code{__builtin_setjmp}/@code{__builtin_longjmp} machinery.
 @end defmac

+@defmac JMP_BUF_SIZE
+This macro has no effect unless @code{DONT_USE_BUILTIN_SETJMP} is also
+defined.  Define this macro if the default size of @code{jmp_buf} buffer
+for the @code{setjmp}/@code{longjmp}-based exception handling mechanism
+is not large enough, or if it is much too large.
+The default size is @code{FIRST_PSEUDO_REGISTER * sizeof(void *)}.
+@end defmac
+
 @defmac DWARF_CIE_DATA_ALIGNMENT
 This macro need only be defined if the target might save registers in the
 function prologue at an offset to the stack pointer that is not aligned to
Index: doc/tm.texi
===================================================================
--- doc/tm.texi (revision 188917)
+++ doc/tm.texi (working copy)
@@ -8961,6 +8961,14 @@ should use the @code{setjmp}/@code{longjmp} functi
 instead of the @code{__builtin_setjmp}/@code{__builtin_longjmp} machinery.
 @end defmac

+@defmac JMP_BUF_SIZE
+This macro has no effect unless @code{DONT_USE_BUILTIN_SETJMP} is also
+defined.  Define this macro if the default size of @code{jmp_buf} buffer
+for the @code{setjmp}/@code{longjmp}-based exception handling mechanism
+is not large enough, or if it is much too large.
+The default size is @code{FIRST_PSEUDO_REGISTER * sizeof(void *)}.
+@end defmac
+
 @defmac DWARF_CIE_DATA_ALIGNMENT
 This macro need only be defined if the target might save registers in the
 function prologue at an offset to the stack pointer that is not aligned to