* Masahiro Yamada <masahiroy@xxxxxxxxxx>: > On Sat, Apr 25, 2020 at 2:47 PM Masahiro Yamada <masahiroy@xxxxxxxxxx> wrote: > > > > 'make ARCH=parisc clean' emits a tons of error messages as follows: > > > > $ make ARCH=parisc clean > > gcc: error: unrecognized command line option '-mno-space-regs' > > gcc: error: unrecognized command line option '-mfast-indirect-calls'; did you mean '-mforce-indirect-call'? > > gcc: error: unrecognized command line option '-mdisable-fpregs' > > gcc: error: missing argument to '-Wframe-larger-than=' > > gcc: error: unrecognized command line option '-mno-space-regs' > > gcc: error: unrecognized command line option '-mfast-indirect-calls'; did you mean '-mforce-indirect-call'? > > gcc: error: unrecognized command line option '-mdisable-fpregs' > > gcc: error: missing argument to '-Wframe-larger-than=' > > ... > > > > You can supporess them except '-Wframe-larger-than' by setting correct > > CROSS_COMPILE=, but we should not require any compiler for cleaning. > > > > This $(shell ...) is evaluated so many times because LIBGCC is exported. > > Use the ':=' operator to evaluate it just once, and sink the stderr. > > > > Applied to linux-kbuild. That patch breaks then building the boot loader/compressor: ... hppa-linux-gnu-ld -X -e startup --as-needed -T arch/parisc/boot/compressed/vmlinux.lds arch/parisc/boot/compressed/head.o arch/parisc/boot/compressed/real2.o arch/parisc/boot/compressed/firmware.o arch/parisc/boot/compressed/misc.o arch/parisc/boot/compressed/piggy.o -o arch/parisc/boot/compressed/vmlinux hppa-linux-gnu-ld: arch/parisc/boot/compressed/misc.o: in function `dec_vli': (.text+0x104): undefined reference to `__ashldi3' hppa-linux-gnu-ld: arch/parisc/boot/compressed/misc.o: in function `lzma_len': (.text+0x2b0): undefined reference to `$$mulI' hppa-linux-gnu-ld: (.text+0x344): undefined reference to `$$mulI' hppa-linux-gnu-ld: (.text+0x3f8): undefined reference to `$$mulI' The patch below works, but I wonder if it's possible to avoid to examine LIBGCC twice....? Helge diff --git a/arch/parisc/Makefile b/arch/parisc/Makefile index 628cd8bb7ad8..aeea20abbf01 100644 --- a/arch/parisc/Makefile +++ b/arch/parisc/Makefile @@ -21,8 +21,7 @@ KBUILD_IMAGE := vmlinuz NM = sh $(srctree)/arch/parisc/nm CHECKFLAGS += -D__hppa__=1 -LIBGCC = $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name) -export LIBGCC +LIBGCC := $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name) ifdef CONFIG_64BIT UTS_MACHINE := parisc64 diff --git a/arch/parisc/boot/compressed/Makefile b/arch/parisc/boot/compressed/Makefile index 1e5879c6a752..b008cf1b5c1e 100644 --- a/arch/parisc/boot/compressed/Makefile +++ b/arch/parisc/boot/compressed/Makefile @@ -22,6 +22,8 @@ ifndef CONFIG_64BIT KBUILD_CFLAGS += -mfast-indirect-calls endif +LIBGCC := $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name) + OBJECTS += $(obj)/head.o $(obj)/real2.o $(obj)/firmware.o $(obj)/misc.o $(obj)/piggy.o LDFLAGS_vmlinux := -X -e startup --as-needed -T
