add ax88772C AX88772C_eeprom_tools

hc

2024-05-10 61598093bbdd283a7edc367d900f223070ead8d2

 kernel/tools/testing/selftests/Makefile
..
..
@@ -104,19 +104,27 @@
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 override LDFLAGS =
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 endif
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-ifneq ($(O),)
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-	BUILD := $(O)/kselftest
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+top_srcdir ?= ../../..
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+
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+ifeq ("$(origin O)", "command line")
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+  KBUILD_OUTPUT := $(O)
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+endif
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+
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+ifneq ($(KBUILD_OUTPUT),)
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+  # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
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+  # expand a shell special character '~'. We use a somewhat tedious way here.
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+  abs_objtree := $(shell cd $(top_srcdir) && mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
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+  $(if $(abs_objtree),, \
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+    $(error failed to create output directory "$(KBUILD_OUTPUT)"))
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+  # $(realpath ...) resolves symlinks
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+  abs_objtree := $(realpath $(abs_objtree))
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+  BUILD := $(abs_objtree)/kselftest
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 else
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-	ifneq ($(KBUILD_OUTPUT),)
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-		BUILD := $(KBUILD_OUTPUT)/kselftest
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-	else
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-		BUILD := $(shell pwd)
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-		DEFAULT_INSTALL_HDR_PATH := 1
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-	endif
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+  BUILD := $(CURDIR)
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+  DEFAULT_INSTALL_HDR_PATH := 1
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 endif
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 # Prepare for headers install
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-top_srcdir ?= ../../..
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 include $(top_srcdir)/scripts/subarch.include
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 ARCH           ?= $(SUBARCH)
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 export KSFT_KHDR_INSTALL_DONE := 1