[LLVMbugs] [Bug 23129] New: Instrumentation-based PGO doesn't work on OS X (?)

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23129

            Bug ID: 23129
           Summary: Instrumentation-based PGO doesn't work on OS X (?)
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: nicolasweber at gmx.de
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

I'm trying to follow the
http://clang.llvm.org/docs/UsersManual.html#profile-guided-optimization
instructions for building ninja. I can't seem to get it to work -- either I'm
holding it wrong, or it broke when it got reshuffled.

I'm doing:

$ git clone https://github.com/martine/ninja.git
Cloning into 'ninja'...
remote: Counting objects: 8458, done.
remote: Compressing objects: 100% (36/36), done.
remote: Total 8458 (delta 15), reused 0 (delta 0), pack-reused 8422
Receiving objects: 100% (8458/8458), 1.86 MiB | 635.00 KiB/s, done.
Resolving deltas: 100% (5974/5974), done.
Checking connectivity... done.
$ cd ninja
$ CXX=/Users/thakis/src/llvm-build/bin/clang++ CFLAGS="-stdlib=libstdc++
-fprofile-instr-generate -isysroot $(xcrun -show-sdk-path)"
LDFLAGS='-stdlib=libstdc++ -fprofile-instr-generate' ./configure.py 
warning: A compatible version of re2c (>= 0.11.3) was not found; changes to
src/*.in.cc will not affect your build.
wrote build.ninja.
$ ninja -v
[1/24] /Users/thakis/src/llvm-build/bin/clang++ -MMD -MT build/build.o -MF
build/build.o.d -g -Wall -Wextra -Wno-deprecated -Wno-unused-parameter
-fno-rtti -fno-exceptions -fvisibility=hidden -pipe
-Wno-missing-field-initializers '-DNINJA_PYTHON="python"' -O2 -DNDEBUG
-fdiagnostics-color -DNINJA_HAVE_BROWSE -stdlib=libstdc++
-fprofile-instr-generate -isysroot
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk
-c src/build.cc -o build/build.o
# ... (omitted, just wanted to show that the flags are there)
[24/24] /Users/thakis/src/llvm-build/bin/clang++ -Lbuild -stdlib=libstdc++
-fprofile-instr-generate -o ninja build/ninja.o -lninja
$ ./ninja manifest_parser_perftest
[2/2] LINK manifest_parser_perftest
Nicos-MBP-8:ninja thakis$ ./manifest_parser_perftest 
Creating manifest data...done.
1128ms (hash: c617022)
1117ms (hash: c617022)
1145ms (hash: c617022)
1131ms (hash: c617022)
1148ms (hash: c617022)
min 1117ms  max 1148ms  avg 1133.8ms
$ ls -l default.profraw 
-rw-r--r--  1 thakis  staff  0 Apr  5 13:56 default.profraw



Note that default.profraw is getting generated, but it ends up empty.

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