http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46401
Summary: [4.5/4.6 Regression] very slow compile time with
-Wsequence-point
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: [email protected]
ReportedBy: [email protected]
Created attachment 22356
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22356
reduced testcase
Compiler output - 4.4.5:
$ time gcc-4.4.5 -Wsequence-point -c testcase.C
real 0m0.514s
user 0m0.470s
sys 0m0.030s
Compiler output - 4.5.1: (disabled checking)
$ time gcc-4.5.1 -Wsequence-point -c testcase.C
real 4m22.328s
user 4m21.230s
sys 0m0.250s
Compiler output - r166492: (enabled checking)
$ time gcc -Wsequence-point -c testcase.C
real 6m2.734s
user 6m2.090s
sys 0m0.300s
Compiler output - r166492 without -Wsequence-point:
$ time gcc -c testcase.C
real 0m0.699s
user 0m0.520s
sys 0m0.050s
The time needed to analyze sequence points grew a lot in 4.5 for attached
testcase. The problem is more likely to appear since -Wsequence-point is
enabled by -Wall. The reduced testcase is from 'cantor', a KDE application.
