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new e999ea73bc configure: keep -march=native for --cpu=host
e999ea73bc is described below
commit e999ea73bcb09eaec2f894039df26519bb9c5ab9
Author: Kacper Michajłow <[email protected]>
AuthorDate: Fri Jun 5 11:35:19 2026 +0200
Commit: Kacper Michajłow <[email protected]>
CommitDate: Mon Jun 22 21:02:17 2026 +0000
configure: keep -march=native for --cpu=host
--cpu=host resolved =native to the concrete CPU name and passed that to
the compiler. The name is a strict superset of the actual machine: it
discards the per-feature adjustments the compiler makes for =native
(e.g. AVX-512 left disabled by the OS or a VM), so the build could emit
instructions that fault at runtime.
Keep the resolved name for per-arch feature gating, but feed
-march/-mcpu=native for the codegen so that information is preserved.
Signed-off-by: Kacper Michajłow <[email protected]>
---
configure | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/configure b/configure
index 7160664603..9eb9d75326 100755
--- a/configure
+++ b/configure
@@ -5627,7 +5627,11 @@ if test "$cpu" = host; then
q
}" $TMPE
}
- cpu=$(check_native -march || check_native -mcpu)
+ if cpu=$(check_native -march); then
+ native_cpuflags="-march=native"
+ elif cpu=$(check_native -mcpu); then
+ native_cpuflags="-mcpu=native"
+ fi
;;
clang)
check_native(){
@@ -5639,7 +5643,7 @@ if test "$cpu" = host; then
q
}" $TMPE
}
- cpu=$(check_native -march)
+ cpu=$(check_native -march) && native_cpuflags="-march=native"
;;
esac
@@ -6011,6 +6015,9 @@ else
fi
if [ "$cpu" != generic ]; then
+ # For --cpu=host, use the compiler's =native for codegen. $cpu is
+ # only the resolved name used for feature gating above.
+ test -n "$native_cpuflags" && cpuflags=$native_cpuflags
add_allcflags $cpuflags
add_asflags $cpuflags
test "$cc_type" = "$ld_type" && add_ldflags $cpuflags
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