treewide: Use pkgs/build-support/roles.bash to remove copy pasta

Also fix some setup hooks that unnecessarily used environment hooks,
which revolted in the same variable being modified too many times.

1 files changed, 4 insertions, 12 deletions

diff --git a/pkgs/development/compilers/gcc/libstdc++-hook.sh b/pkgs/development/compilers/gcc/libstdc++-hook.sh
index 2325eeb9e2cf..8b1d5d2da678 100644
--- a/pkgs/development/compilers/gcc/libstdc++-hook.sh
+++ b/pkgs/development/compilers/gcc/libstdc++-hook.sh
@@ -1,13 +1,5 @@
-# The `hostOffset` describes how the host platform of the dependencies are slid
-# relative to the depending package. It is brought into scope of the setup hook
-# defined as the role of the dependency whose hooks is being run.
-case $hostOffset in
-    -1) local role='BUILD_' ;;
-    0)  local role='' ;;
-    1)  local role='TARGET_' ;;
-    *)  echo "cc-wrapper: Error: Cannot be used with $hostOffset-offset deps" >2;
-        return 1 ;;
-esac
+# See pkgs/build-support/setup-hooks/role.bash
+getHostRole
 
-export NIX_${role}CXXSTDLIB_COMPILE+=" -isystem $(echo -n @gcc@/include/c++/*) -isystem $(echo -n @gcc@/include/c++/*)/$(@gcc@/bin/gcc -dumpmachine)"
-export NIX_${role}CXXSTDLIB_LINK=" -stdlib=libstdc++"
+export NIX_${role_pre}CXXSTDLIB_COMPILE+=" -isystem $(echo -n @gcc@/include/c++/*) -isystem $(echo -n @gcc@/include/c++/*)/$(@gcc@/bin/gcc -dumpmachine)"
+export NIX_${role_pre}CXXSTDLIB_LINK=" -stdlib=libstdc++"