Avoid parallel GCC install in build-many-glibcs.py.

A recent build-many-glibcs.py build
<https://sourceware.org/ml/libc-testresults/2017-q1/msg00067.html> ran
into what proves to be an old known bug
<https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42980> with parallel
install of GCC (one which as discussed there might require automake
changes to fix).  This patch makes build-many-glibcs.py avoid such
intermittent failures from parallel install by using -j1 for GCC make
install (the code in question also applies to binutils make install,
but it doesn't seem worth trying to avoid -j1 there; the builds and
installs of different toolchains are still fully parallel with each
other, this is only about the case when there are few enough of those
that multiple jobs can get used within a single make install).

	* scripts/build-many-glibcs.py (Config.build_cross_tool): Use -j1
	for make install.

diff --git a/ChangeLog b/ChangeLog
index c9a6d804dbb2f44f941bd4c205a7bcf69880236f..9961dc420e14c67a218a5400f4fe6b25027add50 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2017-01-18  Joseph Myers  <joseph@codesourcery.com>
+
+       * scripts/build-many-glibcs.py (Config.build_cross_tool): Use -j1
+       for make install.
+
 2017-01-18  Siddhesh Poyarekar  <siddhesh@sourceware.org>
 
        * po/bg.po: Merge from Translation Project.

diff --git a/scripts/build-many-glibcs.py b/scripts/build-many-glibcs.py
index d27e70b8bdcf06c0ac6eb79a8acabdafc0d3dd5d..d2947e676b45647862cd4e9d033bfc00afe8d591 100755 (executable)
--- a/scripts/build-many-glibcs.py
+++ b/scripts/build-many-glibcs.py
@@ -1173,7 +1173,17 @@ class Config(object):
             cfg_cmd.extend(extra_opts)
         cmdlist.add_command('configure', cfg_cmd)
         cmdlist.add_command('build', ['make'])
-        cmdlist.add_command('install', ['make', 'install'])
+        # Parallel "make install" for GCC has race conditions that can
+        # cause it to fail; see
+        # <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42980>.  Such
+        # problems are not known for binutils, but doing the
+        # installation in parallel within a particular toolchain build
+        # (as opposed to installation of one toolchain from
+        # build-many-glibcs.py running in parallel to the installation
+        # of other toolchains being built) is not known to be
+        # significantly beneficial, so it is simplest just to disable
+        # parallel install for cross tools here.
+        cmdlist.add_command('install', ['make', '-j1', 'install'])
         cmdlist.cleanup_dir()
         cmdlist.pop_subdesc()