Ensure `-f` is not generating huge makefiles

[worksofliam]

Had a repo where even when using -f to specify specific files, the makefile is still. Let's ensure it's working as expected, and update the docs with better examples.

[worksofliam]

So I looked into it and it works kind of as expected. -f tells the makefile generator to generate a specific all target for the specified files.

"args": ["-d", "/Users/barry/Repos/ibmi-company_system", "--verbose", "-f", "qrpglesrc/mypgm.pgm.rpgle", "-bf", "make"]

Generates:

all: .logs .evfevent library $(PREPATH)/MYPGM.PGM

$(PREPATH)/DEPTS.PGM: $(PREPATH)/EMPLOYEES.PGM $(PREPATH)/NEWEMP.PGM $(PREPATH)/DEPARTMENT.FILE $(PREPATH)/DEPTS.FILE
$(PREPATH)/EMPDET.SRVPGM: $(PREPATH)/EMPDET.MODULE
$(PREPATH)/EMPDET.MODULE: $(PREPATH)/EMPLOYEE.FILE $(PREPATH)/DEPARTMENT.FILE
$(PREPATH)/EMPLOYEES.PGM: $(PREPATH)/EMPLOYEE.FILE $(PREPATH)/EMPS.FILE $(PREPATH)/EMPDET.SRVPGM $(PREPATH)/APP.BNDDIR
$(PREPATH)/NEWEMP.PGM: $(PREPATH)/EMPLOYEE.FILE $(PREPATH)/NEMP.FILE
$(PREPATH)/POPDEPT.PGM: $(PREPATH)/DEPARTMENT.FILE
$(PREPATH)/POPEMP.PGM: $(PREPATH)/EMPLOYEE.FILE $(PREPATH)/DEPARTMENT.FILE
$(PREPATH)/TEMPDET.MODULE: $(PREPATH)/EMPLOYEE.FILE $(PREPATH)/DEPARTMENT.FILE $(PREPATH)/EMPDET.SRVPGM
$(PREPATH)/APP.BNDDIR: $(PREPATH)/EMPDET.SRVPGM

$(PREPATH)/MYPGM.PGM: qrpglesrc/mypgm.pgm.rpgle
	liblist -c $(BIN_LIB);\
	liblist -a $(LIBL);\
	system "CRTBNDRPG PGM($(BIN_LIB)/MYPGM) SRCSTMF('qrpglesrc/mypgm.pgm.rpgle') OPTION(*EVENTF) DBGVIEW(*SOURCE) TGTRLS(*CURRENT) TGTCCSID(*JOB) BNDDIR($(APP_BNDDIR)) DFTACTGRP(*NO)" > .logs/mypgm.splf || \
	(system "CPYTOSTMF FROMMBR('$(PREPATH)/EVFEVENT.FILE/MYPGM.MBR') TOSTMF('.evfevent/mypgm.evfevent') DBFCCSID(*FILE) STMFCCSID(1208) STMFOPT(*REPLACE)"; $(SHELL) -c 'exit 1')

$(PREPATH)/DEPTS.PGM: qrpglesrc/depts.pgm.sqlrpgle
	liblist -c $(BIN_LIB);\
	liblist -a $(LIBL);\
	system "CRTSQLRPGI OBJ($(BIN_LIB)/DEPTS) SRCSTMF('qrpglesrc/depts.pgm.sqlrpgle') COMMIT(*NONE) DBGVIEW(*SOURCE) OPTION(*EVENTF) RPGPPOPT(*LVL2) COMPILEOPT('TGTCCSID(*JOB) BNDDIR($(APP_BNDDIR)) DFTACTGRP(*no)')" > .logs/depts.splf || \
	(system "CPYTOSTMF FROMMBR('$(PREPATH)/EVFEVENT.FILE/DEPTS.MBR') TOSTMF('.evfevent/depts.evfevent') DBFCCSID(*FILE) STMFCCSID(1208) STMFOPT(*REPLACE)"; $(SHELL) -c 'exit 1')
$(PREPATH)/EMPLOYEES.PGM: qrpglesrc/employees.pgm.sqlrpgle

# it basically generates all the targets for the entire project

[worksofliam]

I am going to ask the customer who raised this issue if what they want is a slimmed down makefile, with only the targets that are required in the makefile instead of the entire project.

Instead of generating all object targets, only generate the targets which are part of the dependency tree of the sources you passed in?

[worksofliam]

Per the customer

Generating the file now on some customers generates a file of more than 5MB just to do one compile.

Only generating the ones asked for with dependencies is even better.

[worksofliam]

New functionality added in 1.4.0