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[PATCH] build: also exclude .data.rel.ro in $(cmd_obj_init_o)
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 7 Sep 2026 14:18:18 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Roger Pau Monné <roger@xxxxxxxxxxxxxx>
- Delivery-date: Mon, 07 Sep 2026 12:18:28 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
.data.rel.ro really is merely a special case of .rodata: r/o data, but
with runtime relocations (not relevant to Xen), i.e. r/o only after
relocations were performed (by the dynamic loader).
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
.*.local did already cover gcc's use of .data.rel.ro.local, but doesn't
cover Clang using e.g. .data.rel.ro..Lswitch.table.<function>.
Beyond exclusion being similarly (slightly) fragile as that of .rodata,
there's an extra naming issue here: A writable file scope variable named
"ro" with an initializer taking the address of another identifier would,
with -fdata-sections and -fpic, be put in .data.rel.ro by gcc (Clang uses
.data.ro irrespective of -fpic). See also
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127240.
--- a/xen/Rules.mk
+++ b/xen/Rules.mk
@@ -263,7 +263,7 @@ quiet_cmd_obj_init_o = INIT_O $@
define cmd_obj_init_o
$(OBJDUMP) -h $< | while read idx name sz rest; do \
case "$$name" in \
- .*.local) ;; \
+ .*.local|.data.rel.ro|.data.rel.ro.*) ;; \
.text|.text.*|.data|.data.*|.bss|.bss.*) \
test $$(echo $$sz | sed 's,00*,0,') != 0 || continue; \
echo "Error: size of $<:$$name is 0x$$sz" >&2; \
|
