| # Generating dummy probes |
| |
| If Postgres isn't configured with dtrace enabled, we need to generate |
| dummy probes for the entries in probes.d, that do nothing. |
| |
| This is accomplished in Unix via the sed script `Gen_dummy_probes.sed`. We |
| used to use this in MSVC builds using the perl utility `psed`, which mimicked |
| sed. However, that utility disappeared from Windows perl distributions and so |
| we converted the sed script to a perl script to be used in MSVC builds. |
| |
| We still keep the sed script as the authoritative source for generating |
| these dummy probes because except on Windows perl is not a hard requirement |
| when building from a tarball. |
| |
| So, if you need to change the way dummy probes are generated, first change |
| the sed script, and when it's working generate the perl script. This can |
| be accomplished by using the perl utility s2p. |
| |
| s2p is no longer part of the perl core, so it might not be on your system, |
| but it is available on CPAN and also in many package systems. e.g. |
| on Fedora it can be installed using `cpan App::s2p` or |
| `dnf install perl-App-s2p`. |
| |
| The Makefile contains a recipe for regenerating Gen_dummy_probes.pl, so all |
| you need to do is once you have s2p installed is `make Gen_dummy_probes.pl` |
| Note that in a VPATH build this will generate the file in the vpath tree, |
| not the source tree. |
