In Prefix, PATH should also be preserved, resulting in a mouthful of
  `env -i PATH=${PATH} ROOT=${ROOT}`.  The origin commit introducing
  env -i was for "cleanup".  Dropping env -i is cleaner.

Reference: 
https://gitweb.gentoo.org/repo/gentoo/historical.git/commit/?id=a8a64d1886cc5c9f975353b97237f2900a3ee88c
Reference: 
https://gitweb.gentoo.org/repo/gentoo/historical.git/commit/?id=7d9f89700a2ee50674c0d871ec6d21b468ac6206
---
 eclass/toolchain.eclass | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/eclass/toolchain.eclass b/eclass/toolchain.eclass
index ef932d2..8e04864 100644
--- a/eclass/toolchain.eclass
+++ b/eclass/toolchain.eclass
@@ -2119,13 +2119,13 @@ toolchain_pkg_postrm() {
 
 do_gcc_config() {
        if ! should_we_gcc_config ; then
-               env -i ROOT="${ROOT}" gcc-config --use-old --force
+               gcc-config --use-old --force
                return 0
        fi
 
        local current_gcc_config target
 
-       current_gcc_config=$(env -i ROOT="${ROOT}" gcc-config -c ${CTARGET} 
2>/dev/null)
+       current_gcc_config=$(gcc-config -c ${CTARGET} 2>/dev/null)
        if [[ -n ${current_gcc_config} ]] ; then
                local current_specs use_specs
                # figure out which specs-specific config is active
@@ -2159,12 +2159,12 @@ should_we_gcc_config() {
        # if the current config is invalid, we definitely want a new one
        # Note: due to bash quirkiness, the following must not be 1 line
        local curr_config
-       curr_config=$(env -i ROOT="${ROOT}" gcc-config -c ${CTARGET} 2>&1) || 
return 0
+       curr_config=$(gcc-config -c ${CTARGET} 2>&1) || return 0
 
        # if the previously selected config has the same major.minor (branch) as
        # the version we are installing, then it will probably be uninstalled
        # for being in the same SLOT, make sure we run gcc-config.
-       local curr_config_ver=$(env -i ROOT="${ROOT}" gcc-config -S 
${curr_config} | awk '{print $2}')
+       local curr_config_ver=$(gcc-config -S ${curr_config} | awk '{print $2}')
 
        local curr_branch_ver=$(get_version_component_range 1-2 
${curr_config_ver})
 
-- 
2.8.3


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