Can't enable logs on Android

[alopatindev]

I was trying to apply something like RUST_LOGS=debug on Android (debug) build without success.

Is this doc outdated? The first doubt was that the change might should be in main.rs not main.cpp

Trying this

diff --git a/components/servo/main.rs b/components/servo/main.rs
index 08ed645..64598d5 100644
--- a/components/servo/main.rs
+++ b/components/servo/main.rs
@@ -194,9 +194,9 @@ mod android {

     pub fn setup_logging() {
         use self::libc::{STDERR_FILENO, STDOUT_FILENO};
-        //use std::env;
+        use std::env;

-        //env::set_var("RUST_LOG", "servo,gfx,msg,util,layers,js,std,rt,extra");
+        env::set_var("RUST_LOG", "debug");
         redirect_output(STDERR_FILENO);
         redirect_output(STDOUT_FILENO);

—nothing changes, still none of info!, debug! or println! printing anything to adb logcat.

Calling android_glue::write_log directly doesn't print anything either. Because it calls __android_log_write with hardcoded log level 3 (ANDROID_LOG_DEBUG) that never worked for me (because "Debug logs are compiled in but stripped at runtime") even with android:debuggable="true".

Changing it to 4 the direct call of android_glue::write_log is working but still info!, debug! and println! are not printing anything.

Does it work for anyone? How and on which device? Thanks!

P.S.: initially I wanted to enable logging on release builds (is that possible either?), so that profiling thing could work. That would probably help to solve issues #7221 and #7211

[fabricedesre]

Closing as env::set_var("RUST_LOG", "debug"); is now the default on android and logs are redirected to logcat properly.