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Update Environment-Variables.md

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Add TRICK_GTE_EXT documentation
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dbankieris 2020-05-13 11:50:24 -05:00 committed by GitHub
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docs/documentation/building_a_simulation/Environment-Variables.md
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@ -121,6 +121,24 @@ export TRICK_USER_LINK_LIBS="-L/full/path/to/libs -lfile1 /another/path/to/a/lib
``` ```
setenv TRICK_USER_LINK_LIBS "-L/full/path/to/libs -lfile1 /another/path/to/a/libfile2.a" setenv TRICK_USER_LINK_LIBS "-L/full/path/to/libs -lfile1 /another/path/to/a/libfile2.a"
``` ```
### TRICK_GTE_EXT
`TRICK_GTE_EXT` allows you to expose variables defined in makefiles to your sim at runtime. To do so, `export` the variable add it to `TRICK_GTE_EXT`, which is a space-delimited list of names.
```make
export VAR1 := potato
export VAR2 := onion
VAR3 := flapjack
export VAR4 := banana
TRICK_GTE_EXT += VAR1 VAR2 VAR3
```
At run time:
* `VAR1` will be `potato`
* `VAR2` will be `onion`
* `VAR3` won't be defined, as it was not `export`ed
* `VAR4` won't be defined, as it was not added to `TRICK_GTE_EXT`
### MAKEFLAGS ### MAKEFLAGS