[v2] Use builtin sort instead of shell sort

Message ID 20190418194153.2294-1-emeric.dupont@zii.aero
State Superseded
Headers show
  • [v2] Use builtin sort instead of shell sort
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Commit Message

Émeric Dupont April 18, 2019, 7:42 p.m.
Some build environments and configuration options may lead to the make
variable PLUGIN_HEADERS being too long to be passed as parameters to the
shell `echo` command, leading to a "write error" message when making the
target install-plugin.

The following patch fixes this issue by using the [Make $(sort list)][1]
function instead to remove duplicates from the list of headers. There is
no functional change, the value assigned to the shell variable is the

Tested in production on x86 and armv7 cross-compilation toolchains.
    - The length of the headers variable goes from 80000+ chars to 7500+

Tested with make bootstrap and make check on host-x86_64-pc-linux-gnu
    - make bootstrap successful
    - make check fails even before the patch is applied

        WARNING: program timed out.
        FAIL: libgomp.c/../libgomp.c-c++-common/cancel-parallel-1.c execution test
        make[4]: *** [Makefile:479: check-DEJAGNU] Error 1

2019-04-15  Emeric Dupont  <emeric.dupont@zii.aero>

        * Makefile.in: Use builtin sort instead of shell sort

[1]: https://www.gnu.org/software/make/manual/html_node/Text-Functions.html#index-sorting-words

Signed-off-by: Emeric Dupont <emeric.dupont@zii.aero>

 gcc/Makefile.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)



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diff --git a/gcc/Makefile.in b/gcc/Makefile.in
index d186d71c91e..3196e774a26 100644
--- a/gcc/Makefile.in
+++ b/gcc/Makefile.in
@@ -3538,7 +3538,7 @@  install-plugin: installdirs lang.install-plugin s-header-vars install-gengtype
 # We keep the directory structure for files in config or c-family and .def
 # files. All other files are flattened to a single directory.
 $(mkinstalldirs) $(DESTDIR)$(plugin_includedir)
-headers=`echo $(PLUGIN_HEADERS) $$(cd $(srcdir); echo *.h *.def) | tr ' ' '\012' | sort -u`; \
+headers=$(sort $(PLUGIN_HEADERS) $$(cd $(srcdir); echo *.h *.def)); \
 srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*|]/\\\\&/g'`; \
 for file in $$headers; do \
   if [ -f $$file ] ; then \