PR libstdc++/81797 Add .NOTPARALLEL to include/Makefile for darwin

PR libstdc++/81797 Add .NOTPARALLEL to include/Makefile for darwin

[Jonathan Wakely]

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This adds the special .NOTPARALLEL target to include/Makefile when
building on darwin, to work around an apparent bug in the APFS
filesystem.


    PR libstdc++/81797
    * configure.ac (INCLUDE_DIR_NOTPARALLEL): Define.
    * configure: Regenerate.
    * include/Makefile.am (INCLUDE_DIR_NOTPARALLEL): Add .NOTPARALLEL when
    defined.
    * include/Makefile.in: Regenerate.


Tested powerpc64le-linux, and FX reports it works on Darwin. I'll
backport this to the active branches too.

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commit 35204421965912b09146585a143189d0d61d23ec
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Oct 27 01:09:52 2017 +0100

    PR libstdc++/81797 Add .NOTPARALLEL to include/Makefile for darwin
    
            PR libstdc++/81797
            * configure.ac (INCLUDE_DIR_NOTPARALLEL): Define.
            * configure: Regenerate.
            * include/Makefile.am (INCLUDE_DIR_NOTPARALLEL): Add .NOTPARALLEL when
            defined.
            * include/Makefile.in: Regenerate.

diff --git a/libstdc++-v3/configure.ac b/libstdc++-v3/configure.ac
index e110f579917..0ef96270c9c 100644
--- a/libstdc++-v3/configure.ac
+++ b/libstdc++-v3/configure.ac
@@ -473,6 +473,12 @@ AM_CONDITIONAL(BUILD_PDF,
 	       test $ac_cv_prog_DBLATEX = "yes" &&
 	       test $ac_cv_prog_PDFLATEX = "yes")
 
+case "$build" in
+ *-*-darwin* ) glibcxx_include_dir_notparallel=yes ;;
+ * ) glibcxx_include_dir_notparallel=no ;;
+esac
+AM_CONDITIONAL(INCLUDE_DIR_NOTPARALLEL,
+               test $glibcxx_include_dir_notparallel = "yes")
 
 # Propagate the target-specific source directories through the build chain.
 ATOMICITY_SRCDIR=config/${atomicity_dir}
diff --git a/libstdc++-v3/include/Makefile.am b/libstdc++-v3/include/Makefile.am
index 7cf0ef93eb4..70a662fa2f9 100644
--- a/libstdc++-v3/include/Makefile.am
+++ b/libstdc++-v3/include/Makefile.am
@@ -1479,3 +1479,8 @@ $(decimal_headers): ; @:
 $(ext_headers): ; @:
 $(experimental_headers): ; @:
 $(experimental_bits_headers): ; @:
+
+if INCLUDE_DIR_NOTPARALLEL
+# See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81797
+.NOTPARALLEL:
+endif