http://llvm.org/bugs/show_bug.cgi?id=22171
Bug ID: 22171
Summary: Extremely slow compilation of static array
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Created attachment 13655
--> http://llvm.org/bugs/attachment.cgi?id=13655&action=edit
The Makefile for generating and measuring test cases
A static array is initialized with structs containing unordered_sets that are
modified by member functions in place. The compilation takes 4 minutes when
there are 100 elements in the array, and I had not enough patience to wait for
the end of the compilation with 800 elements (in out code base, from where I
have narrowed this down, the compilation of a single file had finished only
after 7+ hours!).
For your convenience, attached is a Makefile that generates a source with a
given amount of elements in the array and measures the compile time for the
given compiler and optimization level, for example:
make COUNT=100 COMPILER=g++ OLEVEL=3
will create _generated100.cpp with 100 elements in the static array and measure
the time it takes g++ -O3 to compile it (on my machine, that is 1 sec).
The defaults are: 800 for COUNT, clang++ for COMPILER, 2 for OLEVEL.
The script requires m4.
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