diff --git a/portage/env/gcc-nolto-nopie.conf b/portage/env/gcc-nolto-nopie.conf
index 68028c8..e609ff6 100644
--- a/portage/env/gcc-nolto-nopie.conf
+++ b/portage/env/gcc-nolto-nopie.conf
@@ -13,7 +13,7 @@ RANLIB="ranlib"
 
 # Flags.
 ## Hardening flags.
-C_HARDENING="-fPIC -fstack-protector-all -fstack-clash-protection -D_FORTIFY_SOURCE=2"
+C_HARDENING="-fPIC -fstack-protector-all -fstack-clash-protection -D_FORTIFY_SOURCE=2 -ftrivial-auto-var-init=zero -fwrapv"
 LD_HARDENING="-Wl,--strip-all -Wl,-z,defs -Wl,-z,now -Wl,-z,relro"
 
 ## Common flags.
diff --git a/portage/env/gcc-nolto.conf b/portage/env/gcc-nolto.conf
index 0d2d6ba..13e3391 100644
--- a/portage/env/gcc-nolto.conf
+++ b/portage/env/gcc-nolto.conf
@@ -13,7 +13,7 @@ RANLIB="ranlib"
 
 # Flags.
 ## Hardening flags.
-C_HARDENING="-fPIE -fPIC -fstack-protector-all -fstack-clash-protection -D_FORTIFY_SOURCE=2"
+C_HARDENING="-fPIE -fPIC -fstack-protector-all -fstack-clash-protection -D_FORTIFY_SOURCE=2 -ftrivial-auto-var-init=zero -fwrapv"
 LD_HARDENING="-Wl,-pie -Wl,--strip-all -Wl,-z,defs -Wl,-z,now -Wl,-z,relro"
 
 ## Common flags.
diff --git a/portage/env/gcc-nopie.conf b/portage/env/gcc-nopie.conf
index 1695d7c..38d38ea 100644
--- a/portage/env/gcc-nopie.conf
+++ b/portage/env/gcc-nopie.conf
@@ -13,7 +13,7 @@ RANLIB="ranlib"
 
 # Flags.
 ## Hardening flags.
-C_HARDENING="-fPIC -fstack-protector-all -fstack-clash-protection -D_FORTIFY_SOURCE=2"
+C_HARDENING="-fPIC -fstack-protector-all -fstack-clash-protection -D_FORTIFY_SOURCE=2 -ftrivial-auto-var-init=zero -fwrapv"
 LD_HARDENING="-Wl,--strip-all -Wl,-z,defs -Wl,-z,now -Wl,-z,relro"
 
 ## Common flags.
diff --git a/portage/env/gcc.conf b/portage/env/gcc.conf
index 47b0dbe..feb3ac8 100644
--- a/portage/env/gcc.conf
+++ b/portage/env/gcc.conf
@@ -13,7 +13,7 @@ RANLIB="ranlib"
 
 # Flags.
 ## Hardening flags.
-C_HARDENING="-fPIE -fPIC -fstack-protector-all -fstack-clash-protection -D_FORTIFY_SOURCE=2"
+C_HARDENING="-fPIE -fPIC -fstack-protector-all -fstack-clash-protection -D_FORTIFY_SOURCE=2 -ftrivial-auto-var-init=zero -fwrapv"
 LD_HARDENING="-Wl,-pie -Wl,--strip-all -Wl,-z,defs -Wl,-z,now -Wl,-z,relro"
 
 ## Common flags.