On Sat, Jul 12, 2025 at 11:48:16PM +0100, Maciej W. Rozycki wrote:
> On Fri, 11 Jul 2025, Richard Fontana wrote:
> I don't know what the legal status of the statement referred is, however
> the original exception as published[1] by FSF says:
>
> '"GCC" means a version of the GNU Compiler Collection, with or without
> modifications, governed by version 3 (or a specified later version) of the
> GNU General Public License (GPL) with the option of using any subsequent
> versions published by the FSF.'
(which is likely the wrong license, the code in the kernel was taken
from something GPLv2).
> which I think makes it clear that "GCC" is a collection of "GNU compilers"
> and therefore the two terms are synonymous to each other for the purpose
> of said exception (in the old days "GCC" stood for "GNU C Compiler", but
> the old meaning makes no sense anymore now that we have compilers for Ada,
> Fortran and many other languages included in GCC).
Since, what, 2001? If this matters for these files, they were forked
*very* long ago!
And, of course, the much better way to solve these self-inflicted
problems is to just use the libgcc that your version of GCC want to use,
the one it ships with itself, it being a necessary portion of the
compiler!
Here, an old patch of mine, this one for SuperH (I have stacks of such
patches, for many archs):
===
commit 9289694955c6105fb6bcc35fbf9ce7acddd60674
Author: Segher Boessenkool <seg...@kernel.crashing.org>
Date: Mon Nov 24 09:36:50 2014 -0800
sh: Use libgcc
Building the kernel with non-ancient compilers fails, because some
newer libgcc functions are missing from the kernel's clone of it.
Use the compiler's libgcc, instead.
diff --git a/arch/sh/Makefile b/arch/sh/Makefile
index 5c8776482530..eae83b76f17c 100644
--- a/arch/sh/Makefile
+++ b/arch/sh/Makefile
@@ -171,6 +171,8 @@ KBUILD_CFLAGS += -pipe $(cflags-y)
KBUILD_CPPFLAGS += $(cflags-y)
KBUILD_AFLAGS += $(cflags-y)
+LIBGCC := $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name)
+
ifeq ($(CONFIG_MCOUNT),y)
KBUILD_CFLAGS += -pg
endif
@@ -180,6 +182,7 @@ ifeq ($(CONFIG_DWARF_UNWINDER),y)
endif
libs-y := arch/sh/lib/ $(libs-y)
+libs-y += $(LIBGCC)
BOOT_TARGETS = uImage uImage.bz2 uImage.gz uImage.lzma uImage.xz uImage.lzo \
uImage.srec uImage.bin zImage vmlinux.bin vmlinux.srec \
diff --git a/arch/sh/lib/Makefile b/arch/sh/lib/Makefile
index eb473d373ca4..2acb2d8c0366 100644
--- a/arch/sh/lib/Makefile
+++ b/arch/sh/lib/Makefile
@@ -6,11 +6,6 @@
lib-y = delay.o memmove.o memchr.o \
checksum.o strlen.o div64.o div64-generic.o
-# Extracted from libgcc
-obj-y += movmem.o ashldi3.o ashrdi3.o lshrdi3.o \
- ashlsi3.o ashrsi3.o ashiftrt.o lshrsi3.o \
- udiv_qrnnd.o
-
udivsi3-y := udivsi3_i4i-Os.o
ifneq ($(CONFIG_CC_OPTIMIZE_FOR_SIZE),y)
===
Segher
