Patrick Georgi (pgeorgi@google.com) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/12294
-gerrit
commit d2bf503f8cea28b95ce4fcd4dead9b69b2196ac1 Author: Patrick Georgi patrick@georgi-clan.de Date: Wed Jan 27 08:18:16 2016 +0100
Provide a gcc-safe null pointer
nullptr is a linker object pointing at 0 that can be used to thwart GCC's (and other compilers') "dereferencing NULL is undefined" optimization strategy when it gets in the way.
Change-Id: I6aa6f28283281ebae73d6349811e290bf1b99483 Signed-off-by: Patrick Georgi patrick@georgi-clan.de --- src/include/stddef.h | 4 ++++ src/lib/program.ld | 4 ++++ 2 files changed, 8 insertions(+)
diff --git a/src/include/stddef.h b/src/include/stddef.h index b58f645..4fe4e05 100644 --- a/src/include/stddef.h +++ b/src/include/stddef.h @@ -34,4 +34,8 @@ typedef unsigned int wint_t; #define MAYBE_STATIC static #endif
+#ifndef __ROMCC__ +extern void *nullptr; +#endif + #endif /* STDDEF_H */ diff --git a/src/lib/program.ld b/src/lib/program.ld index 865b5f6..0a966ad 100644 --- a/src/lib/program.ld +++ b/src/lib/program.ld @@ -133,6 +133,10 @@ _eprogram = .;
/* Discard the sections we don't need/want */
+.nullptr 0 (NOLOAD) : { + nullptr = .; +} + /DISCARD/ : { *(.comment) *(.comment.*)