diff --git a/llvm-core/llvm/llvm-23.1.0.ebuild b/llvm-core/llvm/llvm-23.1.0.ebuild
index 4612c8b5fb3eb..6a4092ea6e45b 100644
--- a/llvm-core/llvm/llvm-23.1.0.ebuild
+++ b/llvm-core/llvm/llvm-23.1.0.ebuild
@@ -388,6 +388,9 @@ multilib_src_configure() {
 	# LLVM with LTO anyway (which is not necessarily its fault).
 	tc-is-gcc && filter-lto
 
+	# https://github.com/llvm/llvm-project/issues/219693
+	append-flags -fno-strict-aliasing
+
 	local ffi_cflags ffi_ldflags
 	if use libffi; then
 		ffi_cflags=$($(tc-getPKG_CONFIG) --cflags-only-I libffi)
diff --git a/llvm-core/llvm/llvm-24.0.0.9999.ebuild b/llvm-core/llvm/llvm-24.0.0.9999.ebuild
index adc67333c68b0..f53515fafd1d5 100644
--- a/llvm-core/llvm/llvm-24.0.0.9999.ebuild
+++ b/llvm-core/llvm/llvm-24.0.0.9999.ebuild
@@ -387,6 +387,9 @@ multilib_src_configure() {
 	# LLVM with LTO anyway (which is not necessarily its fault).
 	tc-is-gcc && filter-lto
 
+	# https://github.com/llvm/llvm-project/issues/219693
+	append-flags -fno-strict-aliasing
+
 	local ffi_cflags ffi_ldflags
 	if use libffi; then
 		ffi_cflags=$($(tc-getPKG_CONFIG) --cflags-only-I libffi)
diff --git a/llvm-core/llvm/llvm-24.0.0_pre20260725.ebuild b/llvm-core/llvm/llvm-24.0.0_pre20260725.ebuild
index ab1a35bdebcea..c6831039007b6 100644
--- a/llvm-core/llvm/llvm-24.0.0_pre20260725.ebuild
+++ b/llvm-core/llvm/llvm-24.0.0_pre20260725.ebuild
@@ -387,6 +387,9 @@ multilib_src_configure() {
 	# LLVM with LTO anyway (which is not necessarily its fault).
 	tc-is-gcc && filter-lto
 
+	# https://github.com/llvm/llvm-project/issues/219693
+	append-flags -fno-strict-aliasing
+
 	local ffi_cflags ffi_ldflags
 	if use libffi; then
 		ffi_cflags=$($(tc-getPKG_CONFIG) --cflags-only-I libffi)