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nrf/readme: Add section about LTO.

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Adding section about on how to disable use of the linker flag
-flto, by setting the LTO=0 argument to Make. Also, added a
note on recommended toolchains to use that works well with
LTO enabled.
This commit is contained in:
Glenn Ruben Bakke 2019-02-18 19:50:21 +01:00
parent 440462b18e
commit e0c6dfe90a
1 changed files with 15 additions and 1 deletions
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ports/nrf/README.md
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@ -55,7 +55,21 @@ Alternatively the target board could be defined:
make BOARD=pca10040 make BOARD=pca10040
make BOARD=pca10040 flash make BOARD=pca10040 flash
## Compile without LTO enabled
As a space optimization, LTO (Link Time Optimization) has been enabled on all
targets in the nrf-port. The `-flto` linker flag can be toggled easily by using
the argument LTO when building. The example below shows how to disable LTO for
the compilation:
make BOARD=pca10040 LTO=0
**Note**: There have been several issues with use of LTO in conjunction with
GNU ARM Embedded Toolchain 7.2.1/4Q17. It's recommended to use a toolchain after
this release, for example 7.3.1/2Q18 or 8.2.1/4Q18. The alternative would be to
build the target using the LTO=0 as described above.
## Compile and Flash with Bluetooth Stack ## Compile and Flash with Bluetooth Stack
First prepare the bluetooth folder by downloading Bluetooth LE stacks and headers: First prepare the bluetooth folder by downloading Bluetooth LE stacks and headers: