[xen stable-4.19] xen/x86: fix usage of [[:blank:]] with BSD grep

[patchbot@xxxxxxx]

commit 2d88bf5b69cbec182e6bc9a5fa4de44215dd620f
Author:     Roger Pau Monné <roger.pau@xxxxxxxxxx>
AuthorDate: Wed Mar 4 14:54:02 2026 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Mar 4 14:54:02 2026 +0100

    xen/x86: fix usage of [[:blank:]] with BSD grep
    
    BSD grep only recognizes [[:blank:]] as a valid expression when using
    extended (modern) regular expressions.  Pass -E to the grep call used in
    efi-nr-fixups.
    
    Additionally, the return from `wc -l` is space padded on BSD, and hence
    the content of efi-nr-fixups is "       2", not plain "2".  Strip the
    spaces in the Makefile using $(strip ...).
    
    Fixes: 1be65ec4c8bc ('x86/EFI: avoid use of GNU ld's 
--disable-reloc-section when possible')
    Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
    master commit: c13335b5c1292e90436746ec04ed0553b688160b
    master date: 2026-02-13 16:42:34 +0100
---
 xen/arch/x86/arch.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/x86/arch.mk b/xen/arch/x86/arch.mk
index 85d3e7cbfe..4924d3c660 100644
--- a/xen/arch/x86/arch.mk
+++ b/xen/arch/x86/arch.mk
@@ -114,7 +114,7 @@ endif
 ifeq ($(XEN_BUILD_PE),y)
 
 # Check if the linker produces fixups in PE by default
-efi-nr-fixups := $(shell LC_ALL=C $(OBJDUMP) -p $(efi-check).efi | grep 
'^[[:blank:]]*reloc[[:blank:]]*[0-9][[:blank:]].*DIR64$$' | wc -l)
+efi-nr-fixups := $(strip $(shell LC_ALL=C $(OBJDUMP) -p $(efi-check).efi | 
grep -E '^[[:blank:]]*reloc[[:blank:]]*[0-9][[:blank:]].*DIR64$$' | wc -l))
 
 ifeq ($(efi-nr-fixups),2)
 MKRELOC := :
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.19