+ Masahiro, linux-kbuild (EOM) On Mon, Jul 19, 2021 at 12:07 PM H. Nikolaus Schaller <hns@xxxxxxxxxxxxx> wrote: > > Any chance that it gets merged? > > > Am 08.07.2021 um 10:57 schrieb H. Nikolaus Schaller <hns@xxxxxxxxxxxxx>: > > > > Trying to run the x86 relocs tool on a BSD based HOSTCC (cross > > compilation environment) leads to errors like > > > > VOFFSET arch/x86/boot/compressed/../voffset.h - due to: vmlinux > > CC arch/x86/boot/compressed/misc.o - due to: arch/x86/boot/compressed/../voffset.h > > OBJCOPY arch/x86/boot/compressed/vmlinux.bin - due to: vmlinux > > RELOCS arch/x86/boot/compressed/vmlinux.relocs - due to: vmlinux > > empty (sub)expressionarch/x86/boot/compressed/Makefile:118: recipe for target 'arch/x86/boot/compressed/vmlinux.relocs' failed > > make[3]: *** [arch/x86/boot/compressed/vmlinux.relocs] Error 1 > > > > and when cross compiling a MIPS kernel on a BSD based HOSTCC > > we get errors like > > > > SYNC include/config/auto.conf.cmd - due to: .config > > egrep: empty (sub)expression > > UPD include/config/kernel.release > > HOSTCC scripts/dtc/dtc.o - due to target missing > > > > It turns out that relocs.c on x86 uses patterns like > > > > "something(|_end)" > > > > while MIPS uses egrep with > > > > (|MINOR_|PATCHLEVEL_) > > > > In both cases it is not valid syntax or gives undefined results > > according to POSIX 9.5.3 ERE Grammar > > > > https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html > > > > It seems to be silently accepted by the Linux regcmp() or egrep > > implementation while a BSD host complains. > > > > Such patterns can be replaced by a transformation like > > > > "(|p1|p2)" -> "(p1|p2)?" > > > > Test Linux: > > > > root@letux:~# echo foo | egrep '^(|foo)$' > > foo > > root@letux:~# echo fool | egrep '^(foo)?$' > > root@letux:~# echo fun | egrep '^(|foo)$' > > root@letux:~# echo f | egrep '^(|foo)$' > > root@letux:~# echo | egrep '^(|foo)$' > > > > root@letux:~# echo foo | egrep '^(foo)?$' > > foo > > root@letux:~# echo fool | egrep '^(foo)?$' > > root@letux:~# echo fun | egrep '^(foo)?$' > > root@letux:~# echo f | egrep '^(foo)?$' > > root@letux:~# echo | egrep '^(foo)?$' > > > > root@letux:~# > > > > Test BSD: > > > > iMac:master hns$ echo foo | egrep '^(|foo)$' > > egrep: empty (sub)expression > > iMac:master hns$ echo fool | egrep '^(foo)?$' > > egrep: empty (sub)expression > > iMac:master hns$ echo fun | egrep '^(|foo)$' > > egrep: empty (sub)expression > > iMac:master hns$ echo f | egrep '^(|foo)$' > > egrep: empty (sub)expression > > iMac:master hns$ echo | egrep '^(|foo)$' > > egrep: empty (sub)expression > > iMac:master hns$ echo foo | egrep '^(foo)?$' > > foo > > iMac:master hns$ echo fool | egrep '^(foo)?$' > > iMac:master hns$ echo fun | egrep '^(foo)?$' > > iMac:master hns$ echo f | egrep '^(foo)?$' > > iMac:master hns$ echo | egrep '^(foo)?$' > > > > iMac:master hns$ > > > > > > H. Nikolaus Schaller (2): > > x86/tools/relocs: Fix non-POSIX regexp > > arch: mips: Fix non-POSIX regexp > > > > arch/mips/Makefile | 2 +- > > arch/x86/tools/relocs.c | 8 ++++---- > > 2 files changed, 5 insertions(+), 5 deletions(-) > > > > -- > > 2.31.1 > > > -- Thanks, ~Nick Desaulniers
