"Cannot perform PGO build because llvm-profdata was not found in PATH" error upon make

[gpshead]

BPO	27983
Nosy	@brettcannon, @gpshead
Dependencies	bpo-26359: CPython build options for out-of-the box performance

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/gpshead'
closed_at = <Date 2016-09-08.07:10:26.145>
created_at = <Date 2016-09-06.23:01:40.382>
labels = []
title = '"Cannot perform PGO build because llvm-profdata was not found in PATH" error upon make'
updated_at = <Date 2016-09-08.07:10:26.144>
user = 'https://github.com/gpshead'

bugs.python.org fields:

activity = <Date 2016-09-08.07:10:26.144>
actor = 'gregory.p.smith'
assignee = 'gregory.p.smith'
closed = True
closed_date = <Date 2016-09-08.07:10:26.145>
closer = 'gregory.p.smith'
components = []
creation = <Date 2016-09-06.23:01:40.382>
creator = 'gregory.p.smith'
dependencies = ['26359']
files = []
hgrepos = []
issue_num = 27983
keywords = []
message_count = 4.0
messages = ['274657', '274660', '274908', '274980']
nosy_count = 4.0
nosy_names = ['brett.cannon', 'gregory.p.smith', 'python-dev', 'alecsandru.patrascu']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue27983'
versions = ['Python 2.7']

[gpshead]

patch in bpo-26307 (which should be in soon) and do the following:

$ CC=clang ../3.6/configure --with-optimizations
$ make profile-opt
Error: Cannot perform PGO build because llvm-profdata was not found in PATH
Please add it to PATH and run ./configure again
Makefile:481: recipe for target 'profile-opt' failed

We can make this experience better. It needs to

(1) Become a configure time error, and
(2) Do a better job of finding llvm-profdata (which exists in ${PATH} as "llvm-profdata-3.8" on Ubuntu 16.04).

[gpshead]

i meant bpo-26359 above, not 26307.

[python-dev]

New changeset 279450d88fb0 by Gregory P. Smith in branch '3.5':
Fixes issue# 27983: Cause lack of llvm-profdata tool when using clang -
https://hg.python.org/cpython/rev/279450d88fb0

New changeset 9f2467e13c98 by Gregory P. Smith in branch 'default':
Fixes Issue bpo-27983: Cause lack of llvm-profdata tool when using clang as
https://hg.python.org/cpython/rev/9f2467e13c98

[python-dev]

New changeset 3f04287e7bea by Gregory P. Smith in branch '2.7':
Fixes issue# 27983: Cause lack of llvm-profdata tool when using clang -
https://hg.python.org/cpython/rev/3f04287e7bea