add FORCE_ALIGNED_MEMORY=1 to -O3

2 files changed, 4 insertions, 1 deletions

diff --git a/emcc b/emcc
index 8c528a46..4315219a 100755
--- a/emcc
+++ b/emcc
@@ -167,6 +167,7 @@ Options that are modified or new in %s include:
   -O3                      As -O2, plus dangerous optimizations that may
                            break the generated code! This adds
 
+                              -s FORCE_ALIGNED_MEMORY=1
                               -s DOUBLE_MODE=0
                               -s PRECISE_I64_MATH=0
                               --closure 1
@@ -174,7 +175,8 @@ Options that are modified or new in %s include:
 
                            This is not recommended at all. A better idea
                            is to try each of these separately on top of
-                           -O2 to see what works. See the wiki for more
+                           -O2 to see what works. See the wiki and
+                           src/settings.js (for the -s options) for more
                            information.
 
   -s OPTION=VALUE          JavaScript code generation option passed
diff --git a/tools/shared.py b/tools/shared.py
index 0818f6b9..cc056074 100644
--- a/tools/shared.py
+++ b/tools/shared.py
@@ -678,6 +678,7 @@ class Settings:
           Settings.RELOOP = 1
         if opt_level >= 3:
           # Aside from these, -O3 also runs closure compiler and llvm lto
+          Settings.FORCE_ALIGNED_MEMORY = 1
           Settings.DOUBLE_MODE = 0
           Settings.PRECISE_I64_MATH = 0
           if noisy: logging.warning('Applying some potentially unsafe optimizations! (Use -O2 if this fails.)')