From f4c7688946646bd3be4ee84c694dd987ea344bf6 Mon Sep 17 00:00:00 2001
From: Alexey Neyman <stilor@att.net>
Date: Wed, 9 Nov 2016 16:46:01 -0800
Subject: Do not run 'make install' in parallel in GCC.

Signed-off-by: Alexey Neyman <stilor@att.net>

diff --git a/scripts/build/cc/100-gcc.sh b/scripts/build/cc/100-gcc.sh
index bab4c7b..0e0f8ed 100644
--- a/scripts/build/cc/100-gcc.sh
+++ b/scripts/build/cc/100-gcc.sh
@@ -696,8 +696,16 @@ do_gcc_core_backend() {
     CT_DoLog EXTRA "Building ${log_txt}"
     CT_DoExecLog ALL ${make} ${JOBSFLAGS} ${core_targets_all}
 
+    # Do not pass ${JOBSFLAGS} here: recent GCC builds have been failing
+    # in parallel 'make install' at random locations: libitm, libcilk,
+    # always for the files that are installed more than once to the same
+    # location (such as libitm.info).
+    # The symptom is that the install command fails with "File exists"
+    # error; running the same command manually succeeds. It looks like
+    # attempts to remove the destination and re-create it, but another
+    # install gets in the way.
     CT_DoLog EXTRA "Installing ${log_txt}"
-    CT_DoExecLog ALL ${make} ${JOBSFLAGS} ${core_targets_install}
+    CT_DoExecLog ALL ${make} ${core_targets_install}
 
     # Remove the libtool "pseudo-libraries": having them in the installed
     # tree makes the libtoolized utilities that are built next assume
@@ -1128,11 +1136,12 @@ do_gcc_backend() {
     CT_DoLog EXTRA "Building final gcc compiler"
     CT_DoExecLog ALL ${make} ${JOBSFLAGS} all
 
+    # See the note on issues with parallel 'make install' in GCC above.
     CT_DoLog EXTRA "Installing final gcc compiler"
     if [ "${CT_STRIP_TARGET_TOOLCHAIN_EXECUTABLES}" = "y" ]; then
-        CT_DoExecLog ALL ${make} ${JOBSFLAGS} install-strip
+        CT_DoExecLog ALL ${make} install-strip
     else
-        CT_DoExecLog ALL ${make} ${JOBSFLAGS} install
+        CT_DoExecLog ALL ${make} install
     fi
 
     # Remove the libtool "pseudo-libraries": having them in the installed
-- 
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