Message 55579 - Python tracker (original) (raw)

Martin, you are right: is is related to compiler optimization. I have boiled it down to a call of stringlib_find (defined in Python-2.5.1/Objects/stringlib/find.h) and this runs fine with 'icc -O2' but incorrectly for 'icc -O3'. (The test code is attached.)

So, it seems that the lesson is simply once again: Do not use '-O3' with Intel's C compiler. (At least, for me, it is not the first time that this caused trouble.)

On the other hand, Python's ./configure script is quite clear in its preference of GCC, anyway: It more or less ignores with option '--without-gcc' and uses the content of the CC environment variable only very occasionally.