diff --git a/0001-fix-prototype-deprecated-and-expression-result-unuse.patch b/0001-fix-prototype-deprecated-and-expression-result-unuse.patch
new file mode 100644
index 0000000000000000000000000000000000000000..cf456520dd32df22ed0aca2e7f1ae93afb8f8a31
--- /dev/null
+++ b/0001-fix-prototype-deprecated-and-expression-result-unuse.patch
@@ -0,0 +1,59 @@
+From 8012e240a0427945fe9726ad8e6821984415f24f Mon Sep 17 00:00:00 2001
+From: yuncang123 <1050706328@qq.com>
+Date: Sat, 31 Aug 2024 02:13:17 +0800
+Subject: [PATCH] fix prototype deprecated and expression result unused
+
+---
+ lib/libswan/ckaid.c        | 2 +-
+ lib/libswan/subnettypeof.c | 3 +--
+ lib/libswan/ultot.c        | 7 ++-----
+ 3 files changed, 4 insertions(+), 8 deletions(-)
+
+diff --git a/lib/libswan/ckaid.c b/lib/libswan/ckaid.c
+index 5365946..d13fa38 100644
+--- a/lib/libswan/ckaid.c
++++ b/lib/libswan/ckaid.c
+@@ -81,7 +81,7 @@ ckaid_t ckaid_from_secitem(const SECItem *const nss_ckaid)
+ 	/* ckaid = { .len = min(...), } barfs with gcc 11.2.1 */
+ 	ckaid_t ckaid = {0};
+ 	/* should not be truncated but can be */
+-	ckaid.len = min(nss_ckaid_len, sizeof(ckaid.ptr/*array*/)),
++	ckaid.len = min(nss_ckaid_len, sizeof(ckaid.ptr/*array*/));
+ 	pexpect(ckaid.len == nss_ckaid_len);
+ 	memmove(ckaid.ptr, nss_ckaid->data, ckaid.len);
+ 	return ckaid;
+diff --git a/lib/libswan/subnettypeof.c b/lib/libswan/subnettypeof.c
+index 0413547..cbe8ee4 100644
+--- a/lib/libswan/subnettypeof.c
++++ b/lib/libswan/subnettypeof.c
+@@ -20,8 +20,7 @@
+  * masktocount - convert a mask, expressed as an address, to a bit count
+  */
+ int	/* -1 if not valid mask */
+-masktocount(src)
+-const ip_address * src;
++masktocount(const ip_address * src)
+ {
+ 	int b;
+ 	const unsigned char *p;
+diff --git a/lib/libswan/ultot.c b/lib/libswan/ultot.c
+index 0e7b413..9d90cf4 100644
+--- a/lib/libswan/ultot.c
++++ b/lib/libswan/ultot.c
+@@ -21,11 +21,8 @@
+    - ultot - convert unsigned long to text
+  */
+ size_t                          /* length required for full conversion */
+-ultot(n, base, dst, dstlen)
+-unsigned long n;
+-int base;
+-char *dst;                      /* need not be valid if dstlen is 0 */
+-size_t dstlen;
++ultot(unsigned long n, int base, char *dst, size_t dstlen)
++                     /* char *dst need not be valid if dstlen is 0 */
+ {
+ 	char buf[3 * sizeof(unsigned long) + 1];
+ 	char *bufend = buf + sizeof(buf);
+-- 
+2.43.0
+
diff --git a/libreswan.spec b/libreswan.spec
index 922ad09a8c1bcd5f02b7f84dcdccd9f8b87cf515..8cd32edc93ea0c027ffa49f7117d22c580047fea 100644
--- a/libreswan.spec
+++ b/libreswan.spec
@@ -26,7 +26,7 @@
 Name: libreswan
 Summary: IKE implementation for IPsec with IKEv1 and IKEv2 support
 Version: 4.15
-Release: 1
+Release: 2
 License: GPL-2.0-only
 Url: https://libreswan.org/
 Source0: https://download.libreswan.org/%{name}-%{version}.tar.gz
@@ -35,6 +35,7 @@ Source2: https://download.libreswan.org/cavs/ikev1_psk.fax.bz2
 Source3: https://download.libreswan.org/cavs/ikev2.fax.bz2
 Source4: openeuler-libreswan-sysctl.conf
 
+Patch0001: 0001-fix-prototype-deprecated-and-expression-result-unuse.patch
 
 BuildRequires: audit-libs-devel
 BuildRequires: bison
@@ -107,13 +108,23 @@ sed -i '/ipsec --checknss/s/$/ --nssdir \/etc\/ipsec.d/' ./initsystems/systemd/i
 linux_variant=`sed -n -e 's/"//g' -e 's/^ID_LIKE=//p' -e 's/^ID=//p' /etc/os-release|tr '\n' ' ' && echo`
 sed -i "s/filter fedora/filter fedora $linux_variant/" mk/defaults/linux.mk
 
+
 %build
+%if "%toolchain"=="clang"
+make %{?_smp_mflags} \
+    OPTIMIZE_CFLAGS="%{optflags}" \
+    WERROR_CFLAGS="-Werror -Wno-missing-field-initializers" \
+    USERLINK="-Wl,-z,relro -Wl,--as-needed  -Wl,-z,now -flto -fno-lto" \
+    %{libreswan_config} \
+    programs
+%else
 make %{?_smp_mflags} \
     OPTIMIZE_CFLAGS="%{optflags}" \
     WERROR_CFLAGS="-Werror -Wno-missing-field-initializers -Wno-lto-type-mismatch -Wno-maybe-uninitialized" \
     USERLINK="-Wl,-z,relro -Wl,--as-needed  -Wl,-z,now -flto --no-lto" \
     %{libreswan_config} \
     programs
+%endif
 FS=$(pwd)
 
 %install
@@ -191,6 +202,9 @@ certutil -N -d sql:$tmpdir --empty-password
 %attr(0644,root,root) %doc %{_mandir}/*/*
 
 %changelog
+* Sat Aug 31 2024 yuanchao <1050706328@qq.com> - 4.15-2
+- Fix prototype deprecated and expression result unused,support clang build
+
 * Tue Apr 30 2024 wangkai <13474090681@163.com> - 4.15-1
 - Update to 4.15 for fix CVE-2024-3652