This simplifies compiling by allowing users to include
CFLAGS += `pkg-config --cflags erasurecode-1`
LDFLAGS += `pkg-config --libs erasurecode-1`
in makefiles. Otherwise, trying to use pkg-config results in errors like
/usr/local/lib/liberasurecode.so: undefined reference to `dlopen'
/usr/local/lib/liberasurecode.so: undefined reference to `dlclose'
/usr/local/lib/liberasurecode.so: undefined reference to `dlerror'
/usr/local/lib/liberasurecode.so: undefined reference to `dlsym'
collect2: error: ld returned 1 exit status
Change-Id: I39fb137b1a3b6b2beda1d0b28faef3132229ec3b
Previously, we had our own CRC that was almost but not quite like
zlib's implementation. However,
* it hasn't been subjected to the same rigor with regard to error-detection
properties and
* it may not even get used, depending upon whether zlib happens to get
loaded before or after liberasurecode.
Now, we'll use zlib's CRC-32 when writing new frags, while still
tolerating frags that were created with the old implementation.
Change-Id: Ib5ea2a830c7c23d66bf2ca404a3eb84ad00c5bc5
Closes-Bug: 1666320
Tim Burke