[openwrt/openwrt] build: call ipkg-remove using xargs if #args>=512

[LEDE Commits]

ynezz pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/78d1f3ac61b1740f2a45c40bcde0e83246308a18

commit 78d1f3ac61b1740f2a45c40bcde0e83246308a18
Author: Eneas U de Queiroz <cotequeiroz at gmail.com>
AuthorDate: Thu Feb 20 18:29:03 2020 -0300

    build: call ipkg-remove using xargs if #args>=512
    
    The wildcard call to clean up luci package (luci*) can pick up over
    2,300 files when the full tree is built. Running make package/luci/clean
    or a second run of make package/luci/compile would fail with an
    'Argument list too long' error.
    
    To avoid that, a maybe_use_xargs function was created that runs the
    command straight as usual if the number of arguments is < 512, or saves
    the list in a temporary file and feeds it to xargs otherwise.
    
    Signed-off-by: Eneas U de Queiroz <cotequeiroz at gmail.com>
---
 include/package-ipkg.mk | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/include/package-ipkg.mk b/include/package-ipkg.mk
index fa39c0927c..7fc0f86124 100644
--- a/include/package-ipkg.mk
+++ b/include/package-ipkg.mk
@@ -18,10 +18,20 @@ IPKG_REMOVE:= \
 
 IPKG_STATE_DIR:=$(TARGET_DIR)/usr/lib/opkg
 
+# 1: command and initial arguments
+# 2: arguments list
+# 3: tmp filename
+define maybe_use_xargs
+  $(if $(word 512,$(2)), \
+    $(file >$(3),$(2)) $(XARGS) $(1) < "$(3)"; rm "$(3)", \
+    $(1) $(2))
+endef
+
 # 1: package name
 # 2: candidate ipk files
 define remove_ipkg_files
-  $(if $(strip $(2)),$(IPKG_REMOVE) $(1) $(2))
+  $(if $(strip $(2)), \
+    $(call maybe_use_xargs,$(IPKG_REMOVE) $(1),$(2),$(TMP_DIR)/$(1).in))
 endef
 
 # 1: package name