'cflags!': ['-Os'],
'cflags': ['-O2'],
}],
+ # Do not merge -Os and -O2 in LTO.
+ # LTO merges all optimization options at link-time. -O2 takes
+ # precedence over -Os. Avoid using LTO simultaneously
+ # on -Os and -O2 parts for that reason.
+ ['use_lto==1', {
+ 'cflags!': [
+ '-flto',
+ '-ffat-lto-objects',
+ ],
+ }],
+ ['use_lto_o2==1', {
+ 'cflags': [
+ '-flto',
+ '-ffat-lto-objects',
+ ],
+ }],
],
}],
],