# --- T2-COPYRIGHT-BEGIN ---
# t2/package/*/firefox/hotfix-gcc-lto-sandbox-syscallasm.patch
# Copyright (C) 2026 The T2 SDE Project
# SPDX-License-Identifier: GPL-2.0 or patched project license
# --- T2-COPYRIGHT-END ---

Fix gcc LTO link failure of libmozsandbox: undefined reference to SyscallAsm

The workaround forcing a single LTO partition (so the file-scope asm in
seccomp-bpf/syscall.cc lands in the same partition as its user) checked
OS_CXXFLAGS for -flto, but the LTO flags are carried in MOZ_LTO_CFLAGS,
so it never applied. Check CONFIG["MOZ_LTO"] instead.

Signed-off-by: René Rebe <rene@exactco.de>

--- firefox-154.0/security/sandbox/linux/moz.build.orig
+++ firefox-154.0/security/sandbox/linux/moz.build
@@ -128,9 +128,9 @@ if CONFIG["CC_TYPE"] in ("clang", "gcc")
 # gcc lto likes to put the top level asm in syscall.cc in a different partition
 # from the function using it which breaks the build.  Work around that by
 # forcing there to be only one partition.
-for f in CONFIG["OS_CXXFLAGS"]:
-    if f.startswith("-flto") and CONFIG["CC_TYPE"] != "clang":
-        LDFLAGS += ["--param lto-partitions=1"]
+# The LTO flags live in MOZ_LTO_CFLAGS, not OS_CXXFLAGS, so check MOZ_LTO.
+if CONFIG["MOZ_LTO"] and CONFIG["CC_TYPE"] != "clang":
+    LDFLAGS += ["--param", "lto-partitions=1"]
 
 DEFINES["NS_NO_XPCOM"] = True
 DisableStlWrapping()