diff options
| author | Glenn Ruben Bakke | 2019-02-18 19:50:21 +0100 |
|---|---|---|
| committer | Glenn Ruben Bakke | 2019-03-19 16:59:18 +0100 |
| commit | e0c6dfe90a3e6265b06265c5b3124c24703776f1 (patch) | |
| tree | 07952e0dbc202e70944b22420798b090347e0caa | |
| parent | 440462b18ee9ee167e0bf3bf2bf18c09dc99d4a3 (diff) | |
nrf/readme: Add section about LTO.
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.
| -rw-r--r-- | ports/nrf/README.md | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/ports/nrf/README.md b/ports/nrf/README.md index 6c7777488..659a556ae 100644 --- a/ports/nrf/README.md +++ b/ports/nrf/README.md @@ -55,7 +55,21 @@ Alternatively the target board could be defined: make BOARD=pca10040 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 First prepare the bluetooth folder by downloading Bluetooth LE stacks and headers: |