Can't compile OLS under uClibc

[Mr Dini]

Hi,

I wanted to compile the latest OLS release, but because the aio.h header doesn't exist under uClibc, and these functions aren't implemented, the compilation fails:

```
make[3]: Entering directory '/i-data/bf835951/build/openlitespeed-1.4.28/src/http'
g++ -DHAVE_CONFIG_H -I. -I../../src -I../../openssl/include/ -I../../include -I../../src -I../../ssl/include -I../../src -I../../include -I/ffp/include -I/usr/local -I/ffp -I/ffp/pkg -I/usr/include -I/i-data/bf835951/build/openlitespeed-1.4.28/udns-0.4/ -g -O2 -D_GLIBCXX_USE_CXX11_ABI=0 -fstack-protector -MT rewriteengine.o -MD -MP -MF .deps/rewriteengine.Tpo -c -o rewriteengine.o rewriteengine.cpp
In file included from ../../src/http/httpsession.h:23:0,
from rewriteengine.cpp:24:
../../src/edio/aiooutputstream.h:24:17: fatal error: aio.h: No such file or directory
#include <aio.h>
^
compilation terminated.
Makefile:514: recipe for target 'rewriteengine.o' failed
make[3]: *** [rewriteengine.o] Error 1
```

Can you please fix it?

Thanks!

[Mr Dini]

I just patched uClibc to support aio stubs. I looked on the glibc source, and it also use stubs, not real implementations. I Can only see one in musl.

If I use just stubs, the webserver will work?

[George Wang]

It uses aio_write(), if aio_write() in libc is implemented with a direct syscall, then it should work with uClibc when do the similar thing as glibc. 

The wrost case is that you do not configure OLS to use AIO for logging.