I think this patch is a nice improvement!

On Jan 3, 2019, at 2:08 PM, Andres Freund <and...@anarazel.de> wrote:
> Or we could just add an ERROR variant that doesn't exit. Years back
> I'd proposed that we make the log level a bitmask, but it could also
> just be something like CALLSITE_ERROR or something roughly along those
> lines.  There's a few cases in backend code where that'd be beneficial
> too.

I think the logging system can also be applied on pg_regress. Perhaps even
for the external frontend applications?

The patch cannot be applied directly on HEAD. So I patched it on top of 
60d99797bf. When I call pg_log_error() in initdb, I see

Program received signal SIGSEGV, Segmentation fault.
__strlen_avx2 () at ../sysdeps/x86_64/multiarch/strlen-avx2.S:62
62      ../sysdeps/x86_64/multiarch/strlen-avx2.S: No such file or directory.
(gdb) bt
#0  __strlen_avx2 () at ../sysdeps/x86_64/multiarch/strlen-avx2.S:62
#1  0x0000555555568f96 in dopr.constprop ()
#2  0x0000555555569ddb in pg_vsnprintf ()
#3  0x0000555555564236 in pg_log_generic ()
#4  0x000055555555c240 in main ()

I'm not sure what would be causing this behavior. I would appreciate
references or docs for testing and debugging patches more efficiently.
Now I'm having difficulties loading symbols of initdb in gdb.

Thank you,
Donald Dong

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