http://llvm.org/bugs/show_bug.cgi?id=17703
Bug ID: 17703
Summary: ninja is 11% slower when built with libc++ (compared
to libstdc++)
Product: libc++
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Repro:
1. Build ninja ( http://martine.github.io/ninja/ )
mkdir ~/src
cd ~/src
git clone git://github.com/martine/ninja.git
cd ninja && python bootstrap.py
2. Check out chromium
git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
export PATH=$HOME/src/depot_tools:$PATH
fetch chromium --nosvn=True
3. Build it with the ninja binary from step 1
cd src
GYP_GENERATORS=ninja build/gyp_chromium
time caffeinate ~/src/ninja/ninja -C out/Release chrome
4. Measure empty build time of chrome:
time caffeinate ~/src/ninja/ninja -C out/Release chrome
5. Edit ~/src/ninja/build/ninja and add "-stdlib=libstdc++" to cflags and
ldflgs, return `./ninja` to recompile ninja. (libc++ is the default in Xcode5's
clang)
6. Repeat 4. with the new binary
Expected: ninja is fast in the default build configuration.
Actual: ninja is considerably faster when built with libstdc++.
On my system, it's ~650ms vs ~720ms (min of several runs each).
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