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The following snippet of code can be used to check for the existence of a file from within a Makefile.
ifneq ("$(wildcard $(PATH_TO_FILE))","")FILE_EXISTS = 1elseFILE_EXISTS = 0endif Quoting from make documentation.
$(wildcard pattern ) pattern is a file name pattern, typically containing wildcard is a space-separated list of the names of existing files In this present case, we are not using any wildcards, but the absolute path to the file.
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If file1 does not exist then $(wildcard file1) will evaluate to an empty string.
ifeq ($(wildcard file1),) CLEAN_SRC =else CLEAN_SRC = *.h file3endif
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