https://llvm.org/bugs/show_bug.cgi?id=28382
Bug ID: 28382
Summary: excessive compile time with -O2
Product: new-bugs
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: dcb...@hotmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
The attached code seems to take a long time with -O2
$ time ./results/bin/clang -c -O2 glew-b77619.c
real 15m51.212s
user 15m49.941s
sys 0m0.202s
$ time ./results/bin/clang -c glew-b77619.c
real 0m9.283s
user 0m8.964s
sys 0m0.043s
$ ./results/bin/clang -v
clang version 3.9.0 (trunk 274110)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/dcb/llvm/./results/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-redhat-linux/6.1.1
Selected GCC installation: /usr/lib/gcc/x86_64-redhat-linux/6.1.1
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64
[dcb@dhcppc1 llvm]$
Anything up to five minutes seems reasonable, but over 15 minutes seems
a bit much.
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