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gnu make is a little hard to understand sometimes... this is telling in regards to how it handles environment variables generally, within rules and within sub makes
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| root.ruleA You ain't got no kind of feeling inside | |
| export TMP="I got something that'll sho nuff set yo' stuff on fire" | |
| make -C ./submake | |
| make[1]: Entering directory '/home/ismael/Fiddles/make-bug/submake' | |
| child You ain't got no kind of feeling inside | |
| make[1]: Leaving directory '/home/ismael/Fiddles/make-bug/submake' | |
| root.ruleB You ain't got no kind of feeling inside | |
| make -C ./submake | |
| make[1]: Entering directory '/home/ismael/Fiddles/make-bug/submake' | |
| child You ain't got no kind of feeling inside | |
| make[1]: Leaving directory '/home/ismael/Fiddles/make-bug/submake' | |
| root.ruleC You ain't got no kind of feeling inside | |
| make -C ./submake TMP="What I got will knock your pride aside" | |
| make[1]: Entering directory '/home/ismael/Fiddles/make-bug/submake' | |
| child What I got will knock your pride aside | |
| make[1]: Leaving directory '/home/ismael/Fiddles/make-bug/submake' | |
| root.ruleC You ain't got no kind of feeling inside | |
| make -C ./submake | |
| make[1]: Entering directory '/home/ismael/Fiddles/make-bug/submake' | |
| child Tell me something good | |
| make[1]: Leaving directory '/home/ismael/Fiddles/make-bug/submake' |
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| export TMP="You ain't got no kind of feeling inside" | |
| .PHONY: all | |
| all: ruleA ruleB ruleC ruleD | |
| ruleA: | |
| @echo root.ruleA ${TMP} | |
| export TMP="I got something that'll sho nuff set yo' stuff on fire" | |
| $(MAKE) -C ./submake | |
| ruleB: | |
| @echo root.ruleB ${TMP} | |
| $(shell export TMP="You refuse to put anything before your pride") | |
| $(MAKE) -C ./submake | |
| ruleC: | |
| @echo root.ruleC ${TMP} | |
| $(MAKE) -C ./submake TMP="What I got will knock your pride aside" | |
| ruleD: | |
| @echo root.ruleC ${TMP} | |
| $(eval export TMP="Tell me something good") | |
| $(MAKE) -C ./submake |
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| # Note: this should be submake/Makefile, but gisthub doesn't support subdirectories | |
| .PHONY: all | |
| all: child | |
| child: | |
| @echo child ${TMP} |
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