makefile if file exist
I realize this is a bit old at this point, but you don't need to even use a subshell to test if a file exists in Make. It also depends on how you want/expect it to run. Using the wildcard function, like so: all: foo foo: ifeq (,$(wildcard /opt/local/b,Make, like all UNIX utilities, is case-sensitive. PATH is not the same as Path . Also, you should not set the variable PATH as this will change the PATH when commands are invoked, and then your recipes will all fail.
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 makefile if file exist 相關參考資料
How do I check if file exists in Makefile? - Stack Overflow
The second top answer mentions ifeq , however, it fails to mention that these must be on the same level as the name of the target, e.g., to download a file only if it doesn't currently exist, the ... https://stackoverflow.com gnu - Testing if a file exists in makefile target, and quitting if not present ...
I realize this is a bit old at this point, but you don't need to even use a subshell to test if a file exists in Make. It also depends on how you want/expect it to run. Using the wildcard function... https://stackoverflow.com gnu make - Check File Existence with Makefile Conditional - Stack ...
Make, like all UNIX utilities, is case-sensitive. PATH is not the same as Path . Also, you should not set the variable PATH as this will change the PATH when commands are invoked, and then your recipe... https://stackoverflow.com How to check if a file exists in Makefile - Stack Overflow
In the first case, you mistyped the function $(wildcard ...) so you get nothing, always. In the second case, the output of test is always the empty string. It will set its exit code depending on whet... https://stackoverflow.com gnu make - Checking if file exists before removing it in makefile ...
Honestly, that's an XY problem, it is not due neither to the fact that the project is a C++ one nor that it uses the spec C++11. Because of that, the title of the question is a bit misleading, as... https://stackoverflow.com Makefile - Check if a file exists using wildcard function - Humbug
$(wildcard pattern ) The argument pattern is a file name pattern, typically containing wildcard characters (as in shell file name patterns). The result of wildcard is a space-separated list of the na... http://www.humbug.in |