[gcc r12-5764] gcc: Fix "argument list too long" from install-plugins

[gcc r12-5764] gcc: Fix "argument list too long" from install-plugins

[Jeff Law]

https://gcc.gnu.org/g:66e157188bd2f789809e17e85f917534c9381599

commit r12-5764-g66e157188bd2f789809e17e85f917534c9381599
Author: Richard Purdie <richard.purdie@linuxfoundation.org>
Date:   Thu Dec 2 22:00:04 2021 -0500

    gcc: Fix "argument list too long" from install-plugins
    
    When building in longer build paths (200+ characters), the
    "echo $(PLUGIN_HEADERS)" from the install-plugins target would cause an
    "argument list too long error" on some systems.
    
    Avoid this by calling make's sort function on the list which removes
    duplicates and stops the overflow from reaching the echo command.
    The original sort is left to handle the the .h and .def files.
    
    2021-10-26 Richard Purdie <richard.purdie@linuxfoundation.org>
    
    gcc/ChangeLog:
    
            * Makefile.in: Fix "argument list too long" from install-plugins.
    
    Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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

diff --git a/gcc/Makefile.in b/gcc/Makefile.in
index 81ea8a73b99..2a0be9e66a6 100644
--- a/gcc/Makefile.in
+++ b/gcc/Makefile.in
@@ -3691,7 +3691,7 @@ install-plugin: installdirs lang.install-plugin s-header-vars install-gengtype
 # We keep the directory structure for files in config, common/config or
 # c-family and .def files. All other files are flattened to a single directory.
 	$(mkinstalldirs) $(DESTDIR)$(plugin_includedir)
-	headers=`echo $(PLUGIN_HEADERS) $$(cd $(srcdir); echo *.h *.def) | tr ' ' '\012' | sort -u`; \
+	headers=`echo $(sort $(PLUGIN_HEADERS)) $$(cd $(srcdir); echo *.h *.def) | tr ' ' '\012' | sort -u`; \
 	srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*|]/\\\\&/g'`; \
 	for file in $$headers; do \
 	  if [ -f $$file ] ; then \