Edit: Nevermind. I had an extra space so my experiment was flawed. So, I tried it with gcc and clang, and neither did anything strange. Also tried -std=c99 a

Edit: Nevermind. I had an extra space so my experiment was flawed. So, I tried it with gcc and clang, and neither did anything strange. Also tried -std=c99 and -std=c89. All behaved the same. I thought maybe my distro had some default option configured to turn of trigraphs/digraphs, but --verbose didn't seem to show anything suspicious. $ cat garbage.c # include<stdio.h> int main() { puts("What?? (really)"); return 0; } $ clang -std=c11 -o garbage garbage.c $ ./garbage What?? (really) $ clang -std=c99 -o garbage garbage.c $ ./garbage What?? (really) $ man gcc $ clang -std=c89 -o garbage garbage.c $ ./garbage What?? (really) $ gcc -std=c11 -o garbage garbage.c $ ./garbage What?? (really) $ gcc -std=c99 -o garbage garbage.c $ ./garbage What?? (really) $ gcc -std=c89 -o garbage garbage.c $ ./garbage What?? (really) $