TASKING VX-toolset for ARM User Guide

Using the Utilities$(foreach var-name, item ..., action)The foreach function runs through a list of items and performs the same action for each item. Thevar-name is the name of the macro which gets dynamically filled with an item while iterating through theitem list. In the action you can refer to this macro. For example:results in:${foreach T, test filter output, ${T}.c ${T}.h}test.c test.h filter.c filter.h output.c output.h10.3.5. Conditional ProcessingLines containing ifdef, ifndef, else or endif are used for conditional processing of the makefile.They are used in the following way:ifdef macro-nameif-lineselseelse-linesendifThe if-lines and else-lines may contain any number of lines or text of any kind, even other ifdef, ifndef,else and endif lines, or no lines at all.The else line may be omitted, along with the else-lines followingit. White spaces (tabs or spaces) in front of preprocessing directives are allowed.First the macro-name after the ifdef command is checked for definition. If the macro is defined thenthe if-lines are interpreted and the else-lines are discarded (if present). Otherwise the if-lines are discarded;and if there is an else line, the else-lines are interpreted; but if there is no else line, then no lines areinterpreted.When you use the ifndef line instead of ifdef, the macro is tested for not being defined. Theseconditional lines can be nested to any level.You can also add tests based on strings. With ifeq the result is true if the two strings match, with ifneqthe result is true if the two strings do not match. They are used in the following way:ifeq(string1,string2)if-lineselseelse-linesendif10.3.6. Makefile Parsingamk reads and interprets a makefile in the following order:1. When the last character on a line is a backslash (\) (i.e. without trailing white space) then that line andthe next line will be concatenated, removing the backslash and newline.253