Compilation process, libraries used

Development Tools IDE 2.x
1

I want to under stand, how Arduino compiles and uses the library reference.

Compiling process found two libraries SD@1.2.3 SD@2.0.0 then next line is not clear which library is being used.

Appreciate the feed back.

Following is sample

Detecting libraries used...
...
Alternatives for SD.h: [SD@1.2.4 SD@2.0.0]
ResolveLibrary(SD.h)
-> candidates: [SD@1.2.4 SD@2.0.0]
...
Alternatives for FS.h: [FS@2.0.0]
ResolveLibrary(FS.h)
-> candidates: [FS@2.0.0]
...
Alternatives for SPI.h: [SPI@2.0.0]
ResolveLibrary(SPI.h)
-> candidates: [SPI@2.0.0]

2

usually there is a mention of the library used if you look at what's compiled (probably within a -I flag of the compile line)

can you post your test code?
which version of the IDE?

also - how does this relate to the "storage" category ?

3

It is my mistake didn't change storage topic. How can i change it now?
IDE : 2.1.0

As given above which library is used while compiling.
...
Alternatives for SD.h: [SD@1.2.4 SD@2.0.0]
ResolveLibrary(SD.h)
-> candidates: [SD@1.2.4 SD@2.0.0]
...

4

look in the part you don't provide (in the ...) you should see a path for what has been selected

click on the little pencil at the right of your post title

image
image781×133 5.27 KB

then use the popup to select another category and click the green tick mark button

image
image1219×205 5.32 KB

may be move it to the IDE 2.x category

5

Hi @rasheeda

The information is provided near the end of the verbose compilation output. You should see a summary with this form:

Multiple libraries were found for "SPI.h"
  Used: C:\Users\per\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6\libraries\SPI
  Not used: C:\Users\per\Documents\Arduino\libraries\SPI
Using library SPI at version 1.0 in folder: C:\Users\per\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6\libraries\SPI
6

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