Bing-Hua Wang 5a36080f92 Use "#pragma once" for headers
Some of the header guard names in ipmitool duplicated with the ones in
freeipmi.

* ipmitool/ipmi_fru.h and freeipmi/fru/ipmi-fru.h both uses IPMI_FRU_H
* ipmitool/ipmi_sdr.h and freeipmi/sdr/ipmi-sdr.h both uses IPMI_SDR_H
* ipmitool/ipmi_sel.h and freeipmi/sel/ipmi-sel.h both uses IPMI_SEL_H

This is problematic as including the 1st will prevent the 2nd from being
included, leading to the loss of any declarations, inline definitions,
or other "#includes" in the 2nd header.

For example, including ipmitool/ipmi_sel.h and freeipmi/freeipmi.h fails
to build.

$ cat test.c
 #include <ipmitool/ipmi_sel.h>
 #include <freeipmi/freeipmi.h>
$ gcc test.c -I${HOME}/src/oss/ipmitool/include
In file included from /usr/include/freeipmi/freeipmi.h:90,
                 from test.c:2:
/usr/include/freeipmi/sdr/oem/ipmi-sdr-oem-intel-node-manager.h:48:44: error: unknown type name 'ipmi_sdr_ctx_t'; did you mean 'ipmi_fru_ctx_t'?
   48 | int ipmi_sdr_oem_parse_intel_node_manager (ipmi_sdr_ctx_t ctx,
      |                                            ^~~~~~~~~~~~~~
      |                                            ipmi_fru_ctx_t

Remove header guards and use "#pragma once" instead. In this way, we
don't have to do manual management to avoid name clashes.
* src/plugins/lan/md5.h is left as is being an external header
  originally.
* src/plugins/imb/imbapi.h is a convoluted header consisting of multiple
  header guards. Let's just add "#pragma once" and leave header guards
  as is for now.

Signed-off-by: Bing-Hua Wang <binghuawang@ami.com>
2021-04-08 11:29:25 +03:00
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