Passing variable to child instance of make

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Old 06-07-2011
Passing variable to child instance of make

I am trying to export a variable from the parent makefile to a child instance of my makefile within the same directory.

the relevant code in my parent makefile is:
libvar := $(notdir $(basename ../src/file1))
export libvar

.PHONY: library

make -f makechild libvar=file1

in the child makefile, i.e. makechild, I have the following relevant code:
fname := $(addprefix lib, $(LVAR))

but obviously I am missing something because echo $(fname) returns 'lib' (instead of libfile1)when I run the make command in the parent makefile.Smilie

can you pls. help me fix the code so I can export the value of libvar into LVAR

---------- Post updated at 11:10 PM ---------- Previous update was at 09:52 PM ----------

I just figured out I was making a dumb error,
I should keep the variable names the same in both the parent and child makefile.
so, in my child makefile, I renamed LVAR to libvar and it worked.
.....just in case anyone might be interested.
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md(1)							    BSD General Commands Manual 						     md(1)

md -- process raw dependency files produced by cpp -MD SYNOPSIS
md [-d] [-f] [-m makefile] [-u makefile] [-o outputfile] [-v] [-x] [-D c|d|m|o|t|D] DESCRIPTION
The md command basically does two things: Process the raw dependency files produced by the cpp -MD option. There is one line in the file for every #include encountered, but there are repeats and patterns like .../dir1/../dir2 that appear which should reduce to .../dir2. md canonicalizes and flushes repeats from the depen- dency list. It also sorts the file names and "fills" them to a 78 character line. md also updates the makefile directly with the dependency information, so the .d file can be thrown away (see d option). This is done to save space. md assumes that dependency information in the makefile is sorted by .o file name and it procedes to merge in (add/or replace [as appropriate]) the new dependency lines that it has generated. For time effeciency, md assumes that any .d files it is given that were cre- ated before the creation date of the "makefile" were processed already. It ignores them unless the force flag [f] is given. FLAG SUMMARY
-d delete the .d file after it is processed -f force an update of the dependencies in the makefile even though the makefile is more recent than the .n file (This implies that md has been run already.) -m makefile specify the makefile to be upgraded. The defaults are makefile and then Makefile -u makefile like -m above, but the file will be created if necessary -o outputfile specify an output file for the dependencies other than a makefile -v set the verbose flag -x expunge old dependency info from makefile -D c|d|m|o|t|D subswitch for debugging. can be followed by any of "c", "d", "m", "o", "t", "D" meaning: c show file contents d show new dependency crunching m show generation of makefile o show files being opened t show time comparisons D show very low level debugging SEE ALSO
make(1) BUGS
Old, possibly not used by anyone. HISTORY
The md utility was written by Robert V Baron at Carnegie-Mellon University. BSD
June 2, 2019 BSD