This is a makefile, so no. What you could do is replace the $(eval $(call PREPARE_LIB,libname-glob)) lines wherever they are with $(info $(call PREPARE_LIB,libn

This is a makefile, so no. What you could do is replace the $(eval $(call PREPARE_LIB,libname-glob)) lines wherever they are with $(info $(call PREPARE_LIB,libname-glob)) and see what actually expands. But I suspect they've either tried that, or the usage of this macro in conjunction with other macros is so complex that it's not super-easy to parse the output and find the problem. Make is so useful that I'm willing to live without things like a debugger and useful error messages in order to have the flexibility to implement a build system.