change jmp_buf to share an underlying type and struct tag with sigjmp_buf

this is necessary to meet the C++ ABI target. alternatives were
considered to avoid the size increase for non-sig jmp_buf objects, but
they seemed to have worse properties. moreover, the relative size
increase is only extreme on x86[_64]; one way of interpreting this is
that, if the size increase from this patch makes jmp_buf use too much
memory, then the program was already using too much memory when built
for non-x86 archs.

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/x86_64/bits/setjmp.h b/arch/x86_64/bits/setjmp.h
index 81d4968a..63973a80 100644
--- a/arch/x86_64/bits/setjmp.h
+++ b/arch/x86_64/bits/setjmp.h
@@ -1 +1 @@
-typedef unsigned long jmp_buf[8];
+typedef unsigned long __jmp_buf[8];