Dear Scott Wood,
In message 20101210230051.GA30739@udp111988uds.am.freescale.net you wrote:
Recent GCC (4.4+) performs out-of-line epilogues in some cases, when optimizing for size. It causes a link error for _restgpr_30_x (and similar) if libgcc is not linked.
It actually increases size with very small binaries, due to the fixed size of the out-of-line code, and not having any functions that actually need to restore more than 2 or 3 registers. But I don't see a way to turn it off, other than asking GCC to optimize for speed -- which may also increase size for some boards.
Signed-off-by: Scott Wood scottwood@freescale.com
nand_spl/board/amcc/acadia/Makefile | 2 +- nand_spl/board/amcc/bamboo/Makefile | 2 +- nand_spl/board/amcc/canyonlands/Makefile | 2 +- nand_spl/board/amcc/kilauea/Makefile | 2 +- nand_spl/board/amcc/sequoia/Makefile | 2 +- nand_spl/board/freescale/mpc8313erdb/Makefile | 2 +- nand_spl/board/freescale/mpc8315erdb/Makefile | 2 +- nand_spl/board/sheldon/simpc8313/Makefile | 2 +- 8 files changed, 8 insertions(+), 8 deletions(-)
diff --git a/nand_spl/board/amcc/acadia/Makefile b/nand_spl/board/amcc/acadia/Makefile index bee24bc..f8ca654 100644 --- a/nand_spl/board/amcc/acadia/Makefile +++ b/nand_spl/board/amcc/acadia/Makefile @@ -51,7 +51,7 @@ $(nandobj)u-boot-spl.bin: $(nandobj)u-boot-spl $(OBJCOPY) ${OBJCFLAGS} -O binary $< $@
$(nandobj)u-boot-spl: $(OBJS) $(nandobj)u-boot.lds
- cd $(LNDIR) && $(LD) $(LDFLAGS) $(__OBJS) \
- cd $(LNDIR) && $(LD) $(LDFLAGS) $(__OBJS) $(PLATFORM_LIBS) \ -Map $(nandobj)u-boot-spl.map \ -o $(nandobj)u-boot-spl
Just two questions:
Q1: Are we sure that the observed behaviour is intentional, and not eventually unintended behaviour (well, a bug) in the new versions of GCC? In general newer releases are supposed to provide better optimization, but with GCC regressions seem to be more common?
Q2: What happens with older compilers, that don't need this? Is this change a No-Op for these?
Best regards,
Wolfgang Denk