Spurious "platform dependent libraries" warnings when running make

[cjerdonek]

BPO	27713
Nosy	@ned-deily, @cjerdonek, @zhangyangyu
Files	issue27713.patch: Suppress spurious warnings when running make

^{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 = None
closed_at = <Date 2016-08-20.02:16:03.576>
created_at = <Date 2016-08-08.18:06:06.115>
labels = ['build']
title = 'Spurious "platform dependent libraries" warnings when running make'
updated_at = <Date 2016-08-20.02:16:03.575>
user = 'https://github.com/cjerdonek'

bugs.python.org fields:

activity = <Date 2016-08-20.02:16:03.575>
actor = 'ned.deily'
assignee = 'none'
closed = True
closed_date = <Date 2016-08-20.02:16:03.576>
closer = 'ned.deily'
components = ['Build']
creation = <Date 2016-08-08.18:06:06.115>
creator = 'chris.jerdonek'
dependencies = []
files = ['44156']
hgrepos = []
issue_num = 27713
keywords = ['patch']
message_count = 4.0
messages = ['272186', '273141', '273183', '273184']
nosy_count = 4.0
nosy_names = ['ned.deily', 'chris.jerdonek', 'python-dev', 'xiang.zhang']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue27713'
versions = ['Python 3.5', 'Python 3.6']

[cjerdonek]

When installing Python 3.5.2 from source on Ubuntu 14.04 and running
make, I get the below "Could not find platform dependent libraries"
warnings (which I prefixed with "***" for better visibility).

From this message which has more background, these warnings are
apparently harmless:

https://mail.python.org/pipermail/python-dev/2016-August/145783.html

	      -DHGBRANCH="\"`LC_ALL=C `\"" \
	      -o [Modules/getbuildinfo.o](https://github.com/python/cpython/blob/main/Modules/getbuildinfo.o) ./Modules/getbuildinfo.c
gcc -pthread -c -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes    -Werror=declaration-after-statement   -I. -IInclude -I./Include    -DPy_BUILD_CORE -o [Programs/_freeze_importlib.o](https://github.com/python/cpython/blob/main/Programs/_freeze_importlib.o) [Programs/_freeze_importlib.c](https://github.com/python/cpython/blob/main/Programs/_freeze_importlib.c)
gcc -pthread   -o [Programs/_freeze_importlib](https://github.com/python/cpython/blob/main/Programs/_freeze_importlib) [Programs/_freeze_importlib.o](https://github.com/python/cpython/blob/main/Programs/_freeze_importlib.o) [Modules/getbuildinfo.o](https://github.com/python/cpython/blob/main/Modules/getbuildinfo.o) [Parser/acceler.o](https://github.com/python/cpython/blob/main/Parser/acceler.o) [**snipped for brevity**]  [Modules/xxsubtype.o](https://github.com/python/cpython/blob/main/Modules/xxsubtype.o) -lpthread -ldl  -lutil   -lm  
if test "no" != "yes"; then \
	    ./Programs/_freeze_importlib \
	        ./Lib/importlib/_bootstrap.py [Python/importlib.h](https://github.com/python/cpython/blob/main/Python/importlib.h); \
	fi
***: Could not find platform dependent libraries <exec_prefix>
***: Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]
if test "no" != "yes"; then \
	    ./Programs/_freeze_importlib \
	        ./Lib/importlib/_bootstrap_external.py [Python/importlib_external.h](https://github.com/python/cpython/blob/main/Python/importlib_external.h); \
	fi
***: Could not find platform dependent libraries <exec_prefix>
***: Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]
gcc -pthread -c -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes    -Werror=declaration-after-statement   -I. -IInclude -I./Include    -DPy_BUILD_CORE -o [Python/frozen.o](https://github.com/python/cpython/blob/main/Python/frozen.o) [Python/frozen.c](https://github.com/python/cpython/blob/main/Python/frozen.c)
rm -f libpython3.5m.a
ar rc libpython3.5m.a [Modules/getbuildinfo.o](https://github.com/python/cpython/blob/main/Modules/getbuildinfo.o)

[zhangyangyu]

This is the design of getpath.c, when no exec/exec_prefix can be found it will emit warning and use the default one. Fortunately it gives use the ability to suppress the warnings. :) Simply set Py_FrozenFlag in _freeze_importlib.c can solve this problem. Upload a trivial patch to set the flag.

[python-dev]

New changeset 97b996d81c62 by Ned Deily in branch '3.5':
Issue bpo-27713: Surpress spurious build warnings when updating importlib's
https://hg.python.org/cpython/rev/97b996d81c62

New changeset 751ca458d669 by Ned Deily in branch 'default':
Issue bpo-27713: merge from 3.5
https://hg.python.org/cpython/rev/751ca458d669

[ned-deily]

That was easy; thanks, Xiang Zhang! Pushed for release in 3.5.3 and 3.6.0.