--- /dev/null
+From: Felix Fietkau <nbd@nbd.name>
+Date: Thu, 4 Apr 2024 12:59:41 +0200
+Subject: [PATCH] build: de-duplicate _DIRS before calling mkdir
+
+If the build path is long, the contents of the _DIRS variable can be very long,
+since it repeats the same directories very often.
+In some cases, this has triggered an "Argument list too long" build error.
+
+Suggested-by: Eneas U de Queiroz <cotequeiroz@gmail.com>
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+
+--- a/src/build.rules
++++ b/src/build.rules
+@@ -80,7 +80,7 @@ endif
+ _DIRS := $(BUILDDIR)/$(PROJ)
+ .PHONY: _make_dirs
+ _make_dirs:
+- @mkdir -p $(_DIRS)
++ @mkdir -p $(sort $(_DIRS))
+
+ $(BUILDDIR)/$(PROJ)/src/%.o: $(ROOTDIR)src/%.c $(CONFIG_FILE) | _make_dirs
+ $(Q)$(CC) -c -o $@ $(CFLAGS) $<
+++ /dev/null
-From beeef79701082a82b2581a674e702ea60a358ce7 Mon Sep 17 00:00:00 2001
-From: Robert Marko <robimarko@gmail.com>
-Date: Sun, 24 Mar 2024 20:47:06 +0100
-Subject: [PATCH] build: make _make_dirs robust against too long argument error
-
-_make_dirs currently can fail as _DIRS can be really long and thus go over
-the MAX_ARG_STRLEN limit so it will fail with:
-/bin/sh: Argument list too long
-
-Lets avoid this by stripping the $(BUILDDIR) prefix and then restoring it.
-
-Signed-off-by: Robert Marko <robimarko@gmail.com>
----
- src/build.rules | 2 +-
- 1 file changed, 1 insertion(+), 1 deletion(-)
-
---- a/src/build.rules
-+++ b/src/build.rules
-@@ -80,7 +80,7 @@ endif
- _DIRS := $(BUILDDIR)/$(PROJ)
- .PHONY: _make_dirs
- _make_dirs:
-- @mkdir -p $(_DIRS)
-+ @printf '$(BUILDDIR)/%s ' $(patsubst $(BUILDDIR)/%,%,$(_DIRS)) | xargs mkdir -p
-
- $(BUILDDIR)/$(PROJ)/src/%.o: $(ROOTDIR)src/%.c $(CONFIG_FILE) | _make_dirs
- $(Q)$(CC) -c -o $@ $(CFLAGS) $<