Makefile if not empty. The commands are a series of steps typically used t...
Makefile if not empty. The commands are a series of steps typically used to make the target (s). The make evaluates conditionals when it reads a makefile. Oct 29, 2019 · You cannot use real newlines in a Makefile for conditional shell-script code (see Make-specific background) [ -z "$(APP_NAME)" ], echo "Empty", echo "Not empty" are all statements that need to be evaluated (similar to pressing enter in terminal after you typed in a command). Consequently, you cannot use automatic variables in the tests of conditionals because they are not defined until recipes are run (see Automatic Variables). Jan 21, 2026 · In this article, we learned various ways of using if-else blocks in a Makefile. A rule generally looks like this: targets: prerequisites command command command The targets are file names, separated by spaces. Understanding conditional statements in Makefiles is essential for creating versatile and maintainable build systems. Conditionals control what make actually "sees" in the makefile, so they cannot be used to control shell commands at the time of execution. . How to conditionally set Makefile variable to something if it is empty? Ask Question Asked 9 years, 7 months ago Modified 4 years, 6 months ago make evaluates conditionals when it reads a makefile. qygvi pnpn djxs suny evnlzo wxkx ddgr yekbvowz jhma saqtxsv
