[ng] dist: do not exceed command line length limits, even with many files

* lib/am/distdir.am (am.mkdir-for-dist, am.write-list-of-distfiles): New
internal functions.
(distdir): Using them and the 'am.xargs-map' function, in a way that
should prevent failures due to excessive command line lengths.

With this, the tests 'dist-many.sh' and 'dist-many2.sh' pass on the
systems where we verified they were previously failing.

Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>

diff --git a/lib/am/distdir.am b/lib/am/distdir.am
index 371a57d3355f2a584cb5cfc2a9cace9a7128d0a9..fd2c39d4b216177605cd70f84622dafb56575b48 100644 (file)
--- a/lib/am/distdir.am
+++ b/lib/am/distdir.am
@@ -69,6 +69,12 @@ am__dist_parent_dirs = \
   $(call am__memoize,am__dist_parent_dirs,$(strip $(sort \
     $(filter-out ., $(patsubst ./%,%,$(dir $(am__dist_files_cooked)))))))
 
+am.mkdir-for-dist = \
+  @$(MKDIR_P) $(patsubst %,"$(distdir)"/%,$1)$(am__newline)
+am.write-list-of-distfiles = \
+  @lst='$1'; for x in $$lst; do echo $$x; done \
+    >> $(am__dir)/$@-list$(am__newline)
+
 if %?TOPDIR_P%
 distdir = $(PACKAGE)-$(VERSION)
 top_distdir = $(distdir)
@@ -127,7 +133,7 @@ if %?SUBDIRS%
 AM_RECURSIVE_TARGETS += distdir
 endif %?SUBDIRS%
 
-distdir: $(am__dist_files)
+distdir: $(am__dist_files) | $(am__dir)
 ##
 ## For Gnits users, this is pretty handy.  Look at 15 lines
 ## in case some explanatory text is desirable.
@@ -149,16 +155,19 @@ if %?TOPDIR_P%
        $(am__remove_distdir)
        test -d "$(distdir)" || mkdir "$(distdir)"
 endif %?TOPDIR_P%
-## Make the subdirectories for the files.
-       @$(if $(am__dist_parent_dirs),\
-          $(MKDIR_P) $(patsubst %,"$(distdir)"/%,$(am__dist_parent_dirs)))
+## Make the subdirectories for the files, avoiding to exceed command
+## line length limitations.
+       $(call am.xargs-map,am.mkdir-for-dist,$(am__dist_parent_dirs))
 ## Install the files and directories, applying a "VPATH rewrite"
 ## by hand where needed.
 ## To get the files in the distribution directory, use 'cp', not 'ln'.
 ## There are situations in which 'ln' can fail.  For instance a file to
 ## distribute could actually be a cross-filesystem symlink -- this can
 ## easily happen if "gettextize" was run on the distribution.
-       @lst='$(am__dist_files_cooked)'; for file in $$lst; do \
+       @rm -f $(am__dir)/$@-list
+       $(call am.xargs-map,am.write-list-of-distfiles, \
+              $(am__dist_files_cooked))
+       @while read file; do \
 ## Always look for the file or directory to distribute in the build
 ## directory first, in VPATH spirit.
          if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
@@ -191,7 +200,7 @@ endif %?TOPDIR_P%
            || cp -p $$d/$$file "$(distdir)/$$file" \
            || exit 1; \
          fi; \
-       done
+       done < $(am__dir)/$@-list
 ##
 ## Test for directory existence here because previous automake
 ## invocation might have created some directories.  Note that we