diff --git a/pkgs/development/compilers/gcc-4.5/builder.sh b/pkgs/development/compilers/gcc-4.5/builder.sh
index e684fbc951e..e1e56c8574a 100644
--- a/pkgs/development/compilers/gcc-4.5/builder.sh
+++ b/pkgs/development/compilers/gcc-4.5/builder.sh
@@ -46,7 +46,7 @@ if test "$noSysDirs" = "1"; then
         export NIX_FIXINC_DUMMY=/usr/include
     fi
 
-    extraFlags="-g0 -O2 -I$NIX_FIXINC_DUMMY $extraFlags"
+    extraFlags="-I$NIX_FIXINC_DUMMY $extraFlags"
     extraLDFlags="-L$glibc_libdir -rpath $glibc_libdir $extraLDFlags"
 
     EXTRA_FLAGS="$extraFlags"
@@ -63,7 +63,7 @@ if test "$noSysDirs" = "1"; then
         unset LIBRARY_PATH
         unset CPATH
         if test -z "$crossStageStatic"; then
-            EXTRA_TARGET_CFLAGS="-g0 -O2 -B${libcCross}/lib -idirafter ${libcCross}/include"
+            EXTRA_TARGET_CFLAGS="-B${libcCross}/lib -idirafter ${libcCross}/include"
             EXTRA_TARGET_LDFLAGS="-Wl,-L${libcCross}/lib"
         fi
     else
@@ -89,7 +89,7 @@ if test "$noSysDirs" = "1"; then
             # The path to the Glibc binaries such as `crti.o'.
             glibc_libdir="$(cat $NIX_GCC_CROSS/nix-support/orig-libc)/lib"
 
-            extraFlags="-g0 -O2 -I$NIX_FIXINC_DUMMY_CROSS $extraFlags"
+            extraFlags="-I$NIX_FIXINC_DUMMY_CROSS $extraFlags"
             extraLDFlags="-L$glibc_libdir -rpath $glibc_libdir $extraLDFlags"
 
             EXTRA_TARGET_CFLAGS="$extraFlags"
diff --git a/pkgs/development/compilers/gcc-4.5/default.nix b/pkgs/development/compilers/gcc-4.5/default.nix
index 1acbb82702b..9d4aeaf01e1 100644
--- a/pkgs/development/compilers/gcc-4.5/default.nix
+++ b/pkgs/development/compilers/gcc-4.5/default.nix
@@ -347,7 +347,7 @@ stdenv.mkDerivation ({
 
   EXTRA_TARGET_CFLAGS =
     if cross != null && libcCross != null
-    then "-g0 -O2 -idirafter ${libcCross}/include"
+    then "-idirafter ${libcCross}/include"
     else null;
 
   EXTRA_TARGET_LDFLAGS =