But in last few days this one guy started adding support for the missing gcc warnings. I also found out that printf() warnings were added within last few months also. So it looks like clang is finally potentially usable! I still have to actually start developing with it, but it looks promising.
This picture shows how much better clang's error and warning handling is compared to gcc.
I also did a few benchmarks with Dovecot:
- Dovecot compiled about 10% faster with clang. Based on clang's web page I expected much more, but I guess it's better than nothing.. (I used configure --enable-optimizations, didn't change anything else)
- Dovecot ran about 7% faster when I/O wasn't the limit (SSD disk, fsync_disable=yes).
Here's how I tested the 7% speed improvement (Dovecot v2.0 hg, Maildir):
imaptest seed=123 secs=300 msgs=100 delete=10 expunge=10 logout=1
1)
gcc version 4.4.3 20100108 (prerelease) (Debian 4.4.2-9)
Logi List Stat Sele Fetc Fet2 Stor Dele Expu Appe Logo
100% 50% 50% 100% 100% 100% 50% 10% 10% 100% 1%
30% 5%
674 31545 31442 674 63169 90559 30029 5419 6332 19773 1348
646 31725 31640 646 63270 90160 29987 5403 6163 20224 1292
2)
clang version 1.5 (trunk 98979)
Target: x86_64-unknown-linux-gnu
Logi List Stat Sele Fetc Fet2 Stor Dele Expu Appe Logo
100% 50% 50% 100% 100% 100% 50% 10% 10% 100% 1%
30% 5%
693 33927 33765 693 68032 96951 32356 5691 6786 21034 1386
674 33990 34027 674 68018 97428 32101 5823 6863 21260 1348
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