I was playing with caching of header file PDSEs when I compiled a C program. I could see from the SMF 42.6 records that CEE.SCEEH.H PDS was being used. It took nearly two hours before my job did not use this PDS!
I created a PDSE called COLIN.SCEEH.H and copied CEE.SCEEH.H into it. I updated my JCL to use the new libraries, reran my job and the SMF records show I was till using CEE.SCEEH.H. Hmm this was very strange.
I renamed CEE.SCEEH.H to COLIN.CEE.SCEEH.H. Did it work ? No – I got compile errors, so I renamed it back again. Removing the data set clearly does not work.
I then spotted in the compiler listing that I had the default SEARCH(//’CEE.SCEEH.+’). I added SE(//’COLIN.SCEEH.+’) and thought Fixed it! No … still not fixed, it still used CEE.SCEEH…
I had to use C options NOSEARCH, SE(//’COLIN.SCEEH.+’) . The first option turns off the SEARCH(//’CEE.SCEEH.+’) , and the second one creates a new one. After a cup of tea and a biscuit I remembered I had hit this about 20 years ago!