diff --git a/pkgs/development/compilers/gcc/10/default.nix b/pkgs/development/compilers/gcc/10/default.nix
index e4cebab266e84..ae5e64dc98faf 100644
--- a/pkgs/development/compilers/gcc/10/default.nix
+++ b/pkgs/development/compilers/gcc/10/default.nix
@@ -257,6 +257,7 @@ stdenv.mkDerivation ({
     })
     EXTRA_FLAGS_FOR_TARGET
     EXTRA_LDFLAGS_FOR_TARGET
+    hostEqualsTarget
     ;
 
   passthru = {
diff --git a/pkgs/development/compilers/gcc/11/default.nix b/pkgs/development/compilers/gcc/11/default.nix
index de764b9ccc7c2..e42ad6c4e5b5e 100644
--- a/pkgs/development/compilers/gcc/11/default.nix
+++ b/pkgs/development/compilers/gcc/11/default.nix
@@ -261,6 +261,7 @@ stdenv.mkDerivation ({
     })
     EXTRA_FLAGS_FOR_TARGET
     EXTRA_LDFLAGS_FOR_TARGET
+    hostEqualsTarget
     ;
 
   passthru = {
diff --git a/pkgs/development/compilers/gcc/12/default.nix b/pkgs/development/compilers/gcc/12/default.nix
index 3c9362fee1ad2..7486c6e5ddd2c 100644
--- a/pkgs/development/compilers/gcc/12/default.nix
+++ b/pkgs/development/compilers/gcc/12/default.nix
@@ -299,6 +299,7 @@ stdenv.mkDerivation ({
     })
     EXTRA_FLAGS_FOR_TARGET
     EXTRA_LDFLAGS_FOR_TARGET
+    hostEqualsTarget
     ;
 
   passthru = {
diff --git a/pkgs/development/compilers/gcc/4.8/default.nix b/pkgs/development/compilers/gcc/4.8/default.nix
index ba084af53ee52..d376eed8f46be 100644
--- a/pkgs/development/compilers/gcc/4.8/default.nix
+++ b/pkgs/development/compilers/gcc/4.8/default.nix
@@ -277,6 +277,7 @@ stdenv.mkDerivation ({
     })
     EXTRA_FLAGS_FOR_TARGET
     EXTRA_LDFLAGS_FOR_TARGET
+    hostEqualsTarget
     ;
 
   passthru = {
diff --git a/pkgs/development/compilers/gcc/4.9/default.nix b/pkgs/development/compilers/gcc/4.9/default.nix
index c28ef88ce9338..4c6e158e2b17f 100644
--- a/pkgs/development/compilers/gcc/4.9/default.nix
+++ b/pkgs/development/compilers/gcc/4.9/default.nix
@@ -297,6 +297,7 @@ stdenv.mkDerivation ({
     })
     EXTRA_FLAGS_FOR_TARGET
     EXTRA_LDFLAGS_FOR_TARGET
+    hostEqualsTarget
     ;
 
   passthru = {
diff --git a/pkgs/development/compilers/gcc/6/default.nix b/pkgs/development/compilers/gcc/6/default.nix
index 8bd9d41f1eaed..880967e71cd44 100644
--- a/pkgs/development/compilers/gcc/6/default.nix
+++ b/pkgs/development/compilers/gcc/6/default.nix
@@ -308,6 +308,7 @@ stdenv.mkDerivation ({
     })
     EXTRA_FLAGS_FOR_TARGET
     EXTRA_LDFLAGS_FOR_TARGET
+    hostEqualsTarget
     ;
 
   passthru = {
diff --git a/pkgs/development/compilers/gcc/7/default.nix b/pkgs/development/compilers/gcc/7/default.nix
index 637be9fd971c6..c4ed5e6dd9298 100644
--- a/pkgs/development/compilers/gcc/7/default.nix
+++ b/pkgs/development/compilers/gcc/7/default.nix
@@ -263,6 +263,7 @@ stdenv.mkDerivation ({
     })
     EXTRA_FLAGS_FOR_TARGET
     EXTRA_LDFLAGS_FOR_TARGET
+    hostEqualsTarget
     ;
 
   passthru = {
diff --git a/pkgs/development/compilers/gcc/8/default.nix b/pkgs/development/compilers/gcc/8/default.nix
index 4eb47d00c5c21..669a2404a8378 100644
--- a/pkgs/development/compilers/gcc/8/default.nix
+++ b/pkgs/development/compilers/gcc/8/default.nix
@@ -241,6 +241,7 @@ stdenv.mkDerivation ({
     })
     EXTRA_FLAGS_FOR_TARGET
     EXTRA_LDFLAGS_FOR_TARGET
+    hostEqualsTarget
     ;
 
   passthru = {
diff --git a/pkgs/development/compilers/gcc/9/default.nix b/pkgs/development/compilers/gcc/9/default.nix
index 4c49cdaa3e259..80d64b6a4bd32 100644
--- a/pkgs/development/compilers/gcc/9/default.nix
+++ b/pkgs/development/compilers/gcc/9/default.nix
@@ -256,6 +256,7 @@ stdenv.mkDerivation ({
     })
     EXTRA_FLAGS_FOR_TARGET
     EXTRA_LDFLAGS_FOR_TARGET
+    hostEqualsTarget
     ;
 
   passthru = {
diff --git a/pkgs/development/compilers/gcc/builder.sh b/pkgs/development/compilers/gcc/builder.sh
index 2d7a058fa015c..dc0f89ef404fb 100644
--- a/pkgs/development/compilers/gcc/builder.sh
+++ b/pkgs/development/compilers/gcc/builder.sh
@@ -96,7 +96,7 @@ if test "$noSysDirs" = "1"; then
         declare EXTRA_FLAGS${post}="${extraFlags[*]}"
     done
 
-    if test -z "${targetConfig-}"; then
+    if test "$hostEqualsTarget" == 1; then
         # host = target, so the flags are the same
         EXTRA_FLAGS_FOR_TARGET="$EXTRA_FLAGS"
         EXTRA_LDFLAGS_FOR_TARGET="$EXTRA_LDFLAGS"
@@ -128,7 +128,7 @@ if test "$noSysDirs" = "1"; then
         "FLAGS_FOR_TARGET=$EXTRA_FLAGS_FOR_TARGET $EXTRA_LDFLAGS_FOR_TARGET"
     )
 
-    if test -z "${targetConfig-}"; then
+    if test "$hostEqualsTarget" == 1; then
         makeFlagsArray+=(
             "BOOT_CFLAGS=$EXTRA_FLAGS $EXTRA_LDFLAGS"
             "BOOT_LDFLAGS=$EXTRA_FLAGS_FOR_TARGET $EXTRA_LDFLAGS_FOR_TARGET"
diff --git a/pkgs/development/compilers/gcc/common/extra-target-flags.nix b/pkgs/development/compilers/gcc/common/extra-target-flags.nix
index 4dedd333b0028..2550c48af36cc 100644
--- a/pkgs/development/compilers/gcc/common/extra-target-flags.nix
+++ b/pkgs/development/compilers/gcc/common/extra-target-flags.nix
@@ -5,6 +5,8 @@ let
 in
 
 {
+  hostEqualsTarget = stdenv.hostPlatform == stdenv.targetPlatform;
+
   # For non-cross builds these flags are currently assigned in builder.sh.
   # It would be good to consolidate the generation of makeFlags
   # ({C,CXX,LD}FLAGS_FOR_{BUILD,TARGET}, etc...) at some point.