build: upgrade to C++23

Meson 1.1.1 and GCC-13 both support C++23 and a sufficient portion of
the standard has been implemented. Upgrade the build to leverage it.

Change-Id: I08759aad9dda3e45b55d8

build: upgrade to C++23

Meson 1.1.1 and GCC-13 both support C++23 and a sufficient portion of
the standard has been implemented. Upgrade the build to leverage it.

Change-Id: I08759aad9dda3e45b55d8602618f4b400ba9c22d
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>

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meson: remove deprecated get_pkgconfig_variable

Since meson 0.56, the `get_pkgconfig_variable` has been deprecated. In
meson 0.58 the `get_variable` was enhanced to no longer require the
`pkgconfig

meson: remove deprecated get_pkgconfig_variable

Since meson 0.56, the `get_pkgconfig_variable` has been deprecated. In
meson 0.58 the `get_variable` was enhanced to no longer require the
`pkgconfig` keyword argument. Ensure meson 0.58 is required and update
the usage of all `get_pkgconfig_variable` and `get_variable` to be the
modern variant.

Change-Id: Ic35c323182e32b7d780aa36228214094a416c45b
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>

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sdbusplus: use shorter type aliases

The sdbusplus headers provide shortened aliases for many types.
Switch to using them to provide better code clarity and shorter
lines. Possible replacements are

sdbusplus: use shorter type aliases

The sdbusplus headers provide shortened aliases for many types.
Switch to using them to provide better code clarity and shorter
lines. Possible replacements are for:
* bus_t
* exception_t
* manager_t
* match_t
* message_t
* object_t
* slot_t

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ib85aa0eb518f1d0e5989d3e8f622f89a796a0082

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Implement a performance testing tool for sensors

There are a lot of hypothesis being made about how to improve the
performance of the sensor subsystem within OpenBMC. There are a number
of statemen

Implement a performance testing tool for sensors

There are a lot of hypothesis being made about how to improve the
performance of the sensor subsystem within OpenBMC. There are a number
of statements being made about dbus performance that actually seem
likely to be related to the efficiency of specific implementations of
certain sensors within OpenBMC. Blocking calls, non blocking calls,
asio, bulk collection, eventing, threads and other design decisions all
can have an effect on the performance of a sensor application.

This commit attempts to write a small, portable daemon that publishes
sensor interfaces read from memory in a relatively simple and
controllable manner. This allows running it on a bmc (with services
unloaded) to determine some theoretical "max" performance
characteristics, assuming 0 cost for grabbing actual values.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: I27f1560ba13492ccff6a01013c3a1d5ee210cef0

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