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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Cross-compiling matplotlib and dependencies for OpenWRT fails on import matplotlib.pyplot","articleBody":"\u003c!--To help us understand and resolve your issue, please fill out the form to the best of your ability.--\u003e\r\n\u003c!--You can feel free to delete the sections that do not apply.--\u003e\r\n\r\n### Bug report\r\n\r\n**Bug summary**\r\n\r\nWhen cross-compiling matplotlib and dependencies (numpy, six, pytz, etc) for OpenWRT in Ubuntu 16.04LTS, all code properly compiles. However, when testing matplotlib on the target, when importing matplotlib.pyplot I get the failure \"terminate called after throwing an instance of 'char const*'\". Specifically, after a font is imported in font_manager, the failure comes up when attempting to add a second font (regardless of the first font). I've attempted multiple versions of Python3 (3.6.2, 3.6.0, 3.5.4), as well as numerous combinations of dependent packages. Not that I am only compiling freetype as a library for the shared object \"libfreetype.so.6*\", as well as the ft2font header file, instead of the full freetype package.\r\n\r\n**Code for reproduction**\r\n\r\n\u003c!--A minimum code snippet required to reproduce the bug, also minimizing the number of dependencies required--\u003e\r\n\r\n```python\r\nimport matplotlib\r\nprint(matplotlib.__version__)\r\nimport matplotlib.pyplot as plt\r\nprint(\"Success!\")\r\n```\r\n\r\n**Actual outcome**\r\n\r\n\u003c!--The output produced by the above code, which may be a screenshot, console output, etc.--\u003e\r\n\r\n```\r\nroot@LEDE:~# python3 test.py --verbose-debug\r\n$HOME=/root\r\nmatplotlib data path /usr/lib/python3.6/site-packages/matplotlib/mpl-data\r\n\r\n*****************************************************************\r\nYou have the following UNSUPPORTED LaTeX preamble customizations:\r\n\r\nPlease do not ask for support with these customizations active.\r\n*****************************************************************\r\n\r\nloaded rc file /usr/lib/python3.6/site-packages/matplotlib/mpl-data/matplotlibrc\r\nmatplotlib version 2.0.2\r\nverbose.level debug\r\ninteractive is False\r\nplatform is linux\r\nloaded modules: \u003cdict_keyiterator object at 0x17ebb00\u003e\r\nCACHEDIR=/root/.cache/matplotlib\r\nfont search path ['/usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf', '/usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/afm', '/usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/pdfcorefonts']\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/cmb10.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/cmr10.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/STIXSizOneSymReg.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/STIXSizThreeSymBol.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/DejaVuSansMono.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/DejaVuSansMono-Oblique.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/DejaVuSerif-Bold.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/STIXGeneral.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/DejaVuSerifDisplay.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/STIXNonUniBolIta.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/cmex10.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/cmmi10.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/cmss10.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/STIXSizTwoSymBol.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/cmsy10.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/cmtt10.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/STIXNonUni.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/DejaVuSans-BoldOblique.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/STIXGeneralItalic.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/STIXGeneralBolIta.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/DejaVuSans-Bold.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/DejaVuSans.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/STIXSizFiveSymReg.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/DejaVuSans-Oblique.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/STIXGeneralBol.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/STIXSizThreeSymReg.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/DejaVuSerif.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/STIXSizFourSymBol.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/STIXSizFourSymReg.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/STIXNonUniBol.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/STIXNonUniIta.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/DejaVuSerif-BoldItalic.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/DejaVuSansDisplay.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/DejaVuSansMono-Bold.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/STIXSizTwoSymReg.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/STIXSizOneSymBol.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/DejaVuSansMono-BoldOblique.ttf\r\ntrying fontname /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/DejaVuSerif-Italic.ttf\r\ncreateFontDict: /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/cmb10.ttf\r\ncreateFontDict: /usr/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf/cmr10.ttf\r\nterminate called after throwing an instance of 'char const*'\r\nAborted\r\n```\r\n\r\n**Expected outcome**\r\n\r\n```\r\nroot@LEDE:~# python3 test.py \r\n2.0.2\r\nSuccess!\r\n```\r\n\r\n**Matplotlib version**\r\n\u003c!--Please specify your platform and versions of the relevant libraries you are using:--\u003e\r\n  * Operating System: OpenWRT / LEDE V17.01.02\r\n  * Matplotlib Version: 2.0.2\r\n  * Python Version: 3.6.2\r\n  * Other Libraries:\r\n    * numpy: 1.12.1\r\n    * six: 1.10.0\r\n    * dateutil: 2.6.1\r\n    * pytz: 2017.2\r\n    * cycler: 0.10.0\r\n    * pyparsing: 2.2.0\r\n    * libfreetype: 2.5.5\r\n    * libpng: 1.2.57\r\n\r\n```\r\nBUILDING MATPLOTLIB\r\n            matplotlib: yes [2.0.2]\r\n                python: yes [3.6.2 (default, Jun  8 2017, 21:02:37)  [GCC\r\n                        5.4.0 20160609]]\r\n              platform: yes [linux]\r\n\r\nREQUIRED DEPENDENCIES AND EXTENSIONS\r\n                 numpy: yes [version 1.12.1]\r\n                   six: yes [using six version 1.10.0]\r\n              dateutil: yes [using dateutil version 2.6.1]\r\n           functools32: yes [Not required]\r\n          subprocess32: yes [Not required]\r\n                  pytz: yes [using pytz version 2017.2]\r\n                cycler: yes [using cycler version 0.10.0]\r\n               tornado: yes [tornado was not found. It is required for the\r\n                        WebAgg backend. pip/easy_install may attempt to\r\n                        install it after matplotlib.]\r\n             pyparsing: yes [using pyparsing version 2.2.0]\r\n                libagg: yes [pkg-config information for 'libagg' could not\r\n                        be found. Using local copy.]\r\n              freetype: yes [version 2.5.5]\r\n                   png: yes [version 1.2.57]\r\n                 qhull: yes [pkg-config information for 'qhull' could not be\r\n                        found. Using local copy.]\r\n```\r\n\r\n\u003c!--Please tell us how you installed matplotlib and python e.g., from source, pip, conda--\u003e\r\n\u003c!--If you installed from conda, please specify which channel you used if not the default--\u003e\r\n\r\n","author":{"url":"https://github.com/jwbrack","@type":"Person","name":"jwbrack"},"datePublished":"2017-09-27T17:38:24.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":19},"url":"https://github.com/9244/matplotlib/issues/9244"}