Boost C++ Libraries: Ticket #7983: Boost:: polygon have issues when compiled using gcc 4.7.x with -O2 optimization level.

attachment set

jp.charras@… — Tue, 05 Feb 2013 19:06:29 GMT

attachment → test_polygon_diff.cpp

sample of erroeous polygon when using gcc 4.7 with -O2 optimization level

owner changed

Andrii Sydorchuk — Thu, 07 Mar 2013 22:15:56 GMT

owner changed from Lucanus Simonson to Andrii Sydorchuk

status changed; resolution set

Andrii Sydorchuk — Wed, 20 Mar 2013 20:48:03 GMT

status new → closed
resolution → worksforme

Please, verify with Boost 1.53. I was trying to reproduce the issue, but got the following output (both with -O1 and -O2): polyset polygons count 1 polygon 0, corners count 12

10, 10 5, 10 5, 5 5, -5 -5, -5 -5, 5 5, 5 5, 10 -10, 10 -10, -10 10, -10 10, 10

jp.charras@… — Wed, 27 Mar 2013 15:00:08 GMT

Sorry for the delay. My tests are made using boost 1.53. I am thinking this issue is also on Linux, but I have a gcc 4.7 version only on Windows/mingw and I am able to test it only with gcc 4.7.2 on mingw (I have only the 4.6 version on my Linux install).

Here is my command to build the test program (using boost 1.53) g++ -Wall -O2 -I /g/boost_1_53_0 test_polygon_diff.cpp

and from gcc -v the gcc version is "gcc version 4.7.2 (GCC)"

Thanks.

the output is: polyset polygons count 0

(and works fine with O1 option)

status changed; resolution deleted

Andrii Sydorchuk — Sun, 09 Jun 2013 20:54:31 GMT

status closed → reopened
resolution worksforme

Andrii Sydorchuk — Sun, 16 Jun 2013 01:35:19 GMT

Is it feasible for you to verify the issue with g++ 4.7.3?

jp.charras@… — Tue, 18 Jun 2013 17:57:38 GMT

I do not have g++ 4.7.3, therefore I asked for help from other developers, who made some tests (tested compil options: -O1, -O2, -O3). Here are results I received: gcc version 4.7.1 20120723 [gcc-4_7-branch revision 189773] (SUSE Linux): error gcc version 4.7.2 (Debian 4.7.2-5) 32 bit: error gcc version 4.7.3 (unknown linux distrib) 32 bit: OK gcc version 4.7.3 (unknown linux distrib) 64 bit: OK gcc version 4.7.3 (Ubuntu/Linaro 4.7.3-1ubuntu1): OK

I hope this is useful for you. Thanks for you work.

anonymous — Tue, 18 Jun 2013 20:46:40 GMT

Looks like the error might be specific to the 32bit platform. I will try to install gcc 4.7.2 on my 64-bit ubuntu.

status changed; resolution set

Andrii Sydorchuk — Thu, 07 Nov 2013 00:06:33 GMT

status reopened → closed
resolution → worksforme

I was not able to reproduce the issue, thus marking it as not repeated. Potentially this defect has to do with the Polygon rounding modes and line intersections. If that's the case the issue will be tracked under ticket #6063.

cc set

Tue, 24 Dec 2013 19:13:09 GMT

cc herrold@… added