On 5/28/22 21:23, Masahiro Yamada wrote:
Guenter Roeck reported the build breakage for parisc and csky.
I confirmed nios2 and openrisc are broken as well.
The reason is that they borrow libgcc.a from the toolchains.
For example, see this line in arch/parisc/Makefile:
LIBGCC := $(shell $(CC) -print-libgcc-file-name)
Some objects in libgcc.a are linked to vmlinux.o, but they do not have
.*.cmd files.
Obviously, there is no EXPORT_SYMBOL in external objects. Ignore them.
(Most of the architectures import library code into the kernel tree.
Perhaps those 4 architectures can do similar, but I am not sure.)
Fixes: f292d875d0dc ("modpost: extract symbol versions from *.cmd files")
Link: https://lore.kernel.org/linux-kbuild/20220528224745.GA2501857@xxxxxxxxxxxx/T/#mac65c20c71c3e272db0350ecfba53fcd8905b0a0
Reported-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>
Tested-by: Guenter Roeck <linux@xxxxxxxxxxxx>
---
scripts/link-vmlinux.sh | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index a7f6196c7e41..68e4be463a76 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -344,9 +344,16 @@ ${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init need-builtin=1
modpost_link vmlinux.o
objtool_link vmlinux.o
-# Generate the list of objects in vmlinux
+# Generate the list of in-tree objects in vmlinux
+#
+# This is used to retrieve symbol versions generated by genksyms.
for f in ${KBUILD_VMLINUX_OBJS} ${KBUILD_VMLINUX_LIBS}; do
case ${f} in
+ *libgcc.a)
+ # Some architectures do '$(CC) --print-libgcc-file-name' to
+ # borrow libgcc.a from the toolchain.
+ # There is no EXPORT_SYMBOL in external objects. Ignore this.
+ ;;
*.a)
${AR} t ${f} ;;
*)
