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On macOS Sierra, warning: implicit declaration of function 'getentropy' #72862

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gareth-rees mannequin opened this issue Nov 12, 2016 · 3 comments
Closed

On macOS Sierra, warning: implicit declaration of function 'getentropy' #72862

gareth-rees mannequin opened this issue Nov 12, 2016 · 3 comments
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3.7 (EOL) end of life build The build process and cross-build OS-mac

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@gareth-rees
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Mannequin

gareth-rees mannequin commented Nov 12, 2016

BPO 28676
Nosy @ronaldoussoren, @ned-deily, @gareth-rees
PRs
  • [Do Not Merge] Convert Misc/NEWS so that it is managed by towncrier #552
    		•
    Files
  • getentropy.patch
    		•

    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 2016-11-12.21:43:39.843>
created_at = <Date 2016-11-12.19:30:20.896>
labels = ['OS-mac', 'build', '3.7']
title = "On macOS Sierra, warning: implicit declaration of function 'getentropy'"
updated_at = <Date 2017-03-31.16:36:38.720>
user = 'https://github.com/gareth-rees'

    bugs.python.org fields:

    activity = <Date 2017-03-31.16:36:38.720>
actor = 'dstufft'
assignee = 'none'
closed = True
closed_date = <Date 2016-11-12.21:43:39.843>
closer = 'ned.deily'
components = ['Build', 'macOS']
creation = <Date 2016-11-12.19:30:20.896>
creator = 'gdr@garethrees.org'
dependencies = []
files = ['45465']
hgrepos = []
issue_num = 28676
keywords = ['patch']
message_count = 3.0
messages = ['280669', '280672', '280674']
nosy_count = 4.0
nosy_names = ['ronaldoussoren', 'ned.deily', 'python-dev', 'gdr@garethrees.org']
pr_nums = ['552']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'compile error'
url = 'https://bugs.python.org/issue28676'
versions = ['Python 2.7', 'Python 3.5', 'Python 3.6', 'Python 3.7']
    @gareth-rees
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    gareth-rees mannequin commented Nov 12, 2016

    On macOS Sierra (OSX 10.12.1):

        $ ./configure --with-pydebug && make
    [... lots of output omitted ...]
    gcc -c -Wno-unused-result -Wsign-compare -g -O0 -Wall -Wstrict-prototypes    -std=c99 -Wextra -Wno-unused-result -Wno-unused-parameter -Wno-missing-field-initializers   -I. -I./Include    -DPy_BUILD_CORE -o Python/random.o Python/random.c
    Python/random.c:97:19: warning: implicit declaration of function 'getentropy' is
          invalid in C99 [-Wimplicit-function-declaration]
                res = getentropy(buffer, len);
                      ^
    1 warning generated.

    This is because OSX 10.12.1 has getentropy() but does not have
    getrandom(). You can see this in pyconfig.h:

        /* Define to 1 if you have the `getentropy' function. */
    #define HAVE_GETENTROPY 1
    /* Define to 1 if the getrandom() function is available */
/* #undef HAVE_GETRANDOM */

    and this means that in Python/random.c the header <sys/random.h> is
    not included:

    #  ifdef HAVE_GETRANDOM
#    include <sys/random.h>
#  elif defined(HAVE_GETRANDOM_SYSCALL)
#    include <sys/syscall.h>
#  endif

    It's necessary include <sys/random.h> if either HAVE_GETRANDOM or
    HAVE_GETENTROPY is defined.

    @gareth-rees gareth-rees mannequin added 3.7 (EOL) end of life build The build process and cross-build OS-mac labels Nov 12, 2016
    @python-dev
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    python-dev mannequin commented Nov 12, 2016

    New changeset 828251c2bccf by Ned Deily in branch '2.7':
    Issue bpo-28676: Prevent missing 'getentropy' declaration warning on macOS.
    https://hg.python.org/cpython/rev/828251c2bccf

    New changeset 0efd48d4c47c by Ned Deily in branch '3.5':
    Issue bpo-28676: Prevent missing 'getentropy' declaration warning on macOS.
    https://hg.python.org/cpython/rev/0efd48d4c47c

    New changeset e2faa8a22b69 by Ned Deily in branch '3.6':
    Issue bpo-28676: merge from 3.5
    https://hg.python.org/cpython/rev/e2faa8a22b69

    New changeset b31a7efd8b31 by Ned Deily in branch 'default':
    Issue bpo-28676: merge from 3.6
    https://hg.python.org/cpython/rev/b31a7efd8b31

    @ned-deily
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    Thanks for the patch, Gareth! Pushed for release in 2.7.13, 3.5.3, 3.6.0b4, and 3.7.0.

    @ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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