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[libstdc++, patch] Fix build on APFS file system

From: FX <fxcoudert at gmail dot com>
To: gcc patches <gcc-patches at gcc dot gnu dot org>, libstdc++ at gcc dot gnu dot org
Date: Wed, 18 Oct 2017 16:51:37 +0200
Subject: [libstdc++, patch] Fix build on APFS file system
Authentication-results: sourceware.org; auth=none

Parallel builds of libstdc++ on APFS filesystem (with 1 ns granularity) on macOS 10.13 often fail (failure rate for “make -j2” to “make -j8” is about 60% from my own builds and results reported by others): https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81797
This is reproducible with several versions of GNU make.

Changing libstdc++’s makefile to mark install-headers with .NOTPARALLEL fixes the issue. We've carried that patch in Homebrew (https://brew.sh) for a few months now, and have had no report of build issues since then.

Bootstrapped and regtested on x86_64-apple-darwin17 (as well as other platforms). OK to commit?

FX

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Follow-Ups:
- Re: [libstdc++, patch] Fix build on APFS file system
  - From: Petr Ovtchenkov
- Re: [libstdc++, patch] Fix build on APFS file system
  - From: Jonathan Wakely
- Re: [libstdc++, patch] Fix build on APFS file system
  - From: Hans-Peter Nilsson
- Re: [libstdc++, patch] Fix build on APFS file system
  - From: Mike Stump

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