detect_modules() in setup.py must also search the sysroot paths

[xdegaye]

BPO	32059
Nosy	@Yhg1s, @brettcannon, @xdegaye, @vadmium, @moreati
PRs	bpo-32059: detect_modules() in setup.py now also searches the sysroot… #4452 [3.6] bpo-32059: setup.py now also searches the sysroot paths (GH-4452) #4562

^{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 2017-11-25.16:26:38.332>
created_at = <Date 2017-11-17.11:19:21.793>
labels = ['type-bug', '3.7', 'build']
title = 'detect_modules() in setup.py must also search the sysroot paths'
updated_at = <Date 2017-11-25.16:52:23.032>
user = 'https://github.com/xdegaye'

bugs.python.org fields:

activity = <Date 2017-11-25.16:52:23.032>
actor = 'xdegaye'
assignee = 'none'
closed = True
closed_date = <Date 2017-11-25.16:26:38.332>
closer = 'xdegaye'
components = ['Cross-Build']
creation = <Date 2017-11-17.11:19:21.793>
creator = 'xdegaye'
dependencies = []
files = []
hgrepos = []
issue_num = 32059
keywords = ['patch']
message_count = 4.0
messages = ['306432', '306448', '306965', '306967']
nosy_count = 5.0
nosy_names = ['twouters', 'brett.cannon', 'xdegaye', 'martin.panter', 'Alex.Willmer']
pr_nums = ['4452', '4562']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue32059'
versions = ['Python 3.6', 'Python 3.7']

[xdegaye]

When cross-compiling, the gcc and clang --sysroot= compiler option may be used to change the logical path of the system headers and libraries to a path located within the install path of the cross-compiler tool chain.

Android is a special case:
--------------------------
With Unified Headers [1], the most recent versions of the Android NDK add an additional constraint: the root paths of usr/include and usr/lib are distinct. For example when cross-compiling for API 24 and the x86_64 architecture the full paths are:

• headers: ANDROID_NDK_ROOT/sysroot/usr/include
• libraries: ANDROID_NDK_ROOT/platforms/android-24/arch-x86_64/usr/lib64

To use sysroot in this example one needs to set sysroot to ANDROID_NDK_ROOT/sysroot in CFLAGS or CPPFLAGS and to set sysroot to ANDROID_NDK_ROOT/platforms/android-24/arch-x86_64 in LDFLAGS, while on a standard platform where the root path of usr/include and usr/lib is common, one would only need to set sysroot to this root path in CFLAGS.

[1] https://android.googlesource.com/platform/ndk.git/+/master/docs/UnifiedHeaders.md

[xdegaye]

while on a standard platform where the root path of usr/include and usr/lib is common, one would only need to set sysroot to this root path in CFLAGS

s/CFLAGS/CC/

[xdegaye]

New changeset 77f5139 by xdegaye in branch 'master':
bpo-32059: setup.py now also searches the sysroot paths (GH-4452)
77f5139

[xdegaye]

New changeset 04af8ac by xdegaye (Miss Islington (bot)) in branch '3.6':
bpo-32059: setup.py now also searches the sysroot paths (GH-4452) (bpo-4562)
04af8ac