Messages in this thread | | | From | Huacai Chen <> | Date | Tue, 6 Sep 2022 12:43:34 +0800 | Subject | Re: [PATCH v7 0/5] LoongArch: Support toolchain with new relocation types |
| |
Hi, Ruoyao,
On Tue, Sep 6, 2022 at 12:27 PM Xi Ruoyao <xry111@xry111.site> wrote: > > On Tue, 2022-09-06 at 09:52 +0800, Huacai Chen wrote: > > > cflags-$(CONFIG_LOONGARCH) := $(subst $(CC_FLAGS_FTRACE),,$(KBUILD_CFLAGS)) \ > > > - -fpic > > > + -fpie > > > > > > cflags-$(CONFIG_EFI_GENERIC_STUB) += -I$(srctree)/scripts/dtc/libfdt > > > > > > (Some explanation: -fpic does not only mean "generate position- > > > independent code", but "generate position-independent code *suitable for > > > use in a shared library*". On LoongArch -mdirect-extern-access cannot > > > work for a shared library so the "-fpic -mdirect-extern-access" > > > combination is rejected deliberately.) > > > > > > Not sure how to submit these changes properly... Do you prefer me to > > > send V8 of this series or a single patch on top of your tree on GitHub? > > > Don't need V8, I will squash it into the previous patch myself. But > > can we keep efistub as is? > > No, we can't allow -mdirect-extern-access -fpic on LoongArch because > without copy relocation such a combination just does not make sense (i. > e. we cannot find a sensible way to handle such a combination in GCC). > So such a combination will cause GCC refuse to run. > > Note that -fpic/-fPIC is "position-independent code *suitable for > use in a shared library*", while -fpie/-fPIE is more like just > "position-independent code". The names of those options are confusing. > (When -fpic was invented first time, people mostly believed "PIC had > been only for shared libraries", so it's named -fpic instead of -shlib > or something.) IMO in the EFI stub for other ports, -fpie should be > used instead of -fpic as well because the EFI stub is not similar to a > shared library in any means. You are right, but I guess that Ard doesn't want to squash the efistub change into the LoongArch efistub support patch. :)
Huacai > > -- > Xi Ruoyao <xry111@xry111.site> > School of Aerospace Science and Technology, Xidian University >
| |