search for: llvm_profdata_file

...k (in a 2nd build) - good|bad|ugly? [ TODO#S: Before doing a 2nd build (and in a 3rd run using more optimized binaries) ] How do I anable LTO via CMAKE? How do I enable PGO via CMAKE? Grepping for 'lto' 'pgo' gives no help in [1]. Searching there for '-fprofile' shows... LLVM_PROFDATA_FILE:PATH Path to a profdata file to pass into clang’s -fprofile-instr-use flag. This can only be specified if you’re building with clang. Unsure what to use! >From my build-script (attached)... ##### BEGIN *** SECTION WILL BE DELETED *** # # XXX: TRYOUT #1: Use GOLD as linker # XXX: TRYOUT #2: Us...

Yes, that was it! Now that I took a closer look, the guide also states that I should use the stage2 build. Silly me. Thanks! On Tue, 3 Sep 2019 at 19:31, David Blaikie <dblaikie at gmail.com> wrote: > I /guess/ you actually want /path/to/release_build/llvm-profdata because > the profiles are generated from binaries compiled with the release build, > so it's the release build

...inst sample source files. While the > instrumented compiler runs it will output a bunch of files containing > performance counters (.profraw files). After generating all the profraw > files you use llvm-profdata to merge the files into a single profdata file > that you can feed into the LLVM_PROFDATA_FILE option. > > Alas, there is an easier way to generate the profdata file! > > If you look in the clang repo at <clang>/cmake/caches/README.txt you’ll see > an explanation of how to use the PGO CMake cache file. The basic idea is you > run: > > $ cmake -G <generator&gt...

> On Jul 23, 2016, at 1:53 PM, Sedat Dilek via llvm-dev <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>> wrote: > > On Sat, Jul 23, 2016 at 7:48 PM, Piotr Padlewski <prazek at google.com <mailto:prazek at google.com>> wrote: >> How big is your project? >> LTO eats RAM even faster than chrome. For example linking clang with LTO >>

I had only a quick view on the blog-texts. It might be that a CLANG generated with LTO/PGO speeds up the build. Can you confirm this? Can you confirm binutils-gold speed up the build? Has LLVM an own linker? Can be used? Speedup the build? Yesterday night I loooked through available CMAKE/LLVM variables... ### GOLD # CMAKE_LINKER:FILEPATH=/usr/bin/ld #

Trying to run a self host "ninja check-clang" with ASan enabled I hit a /lot/ of errors like this (strangely I hit none of these in check-llvm, only in check-clang): Any ideas? ==10525==ERROR: AddressSanitizer failed to deallocate 0x10800 (67584) bytes at address 0x631000014800 ==10525==AddressSanitizer CHECK failed:

...he maximum number of concurrent link jobs. LLVM_PARALLEL_LINK_JOBS:STRING= //Build LLVM with Polly LLVM_POLLY_BUILD:BOOL=ON //Statically link Polly into tools (if available) LLVM_POLLY_LINK_INTO_TOOLS:BOOL=ON //Profiling data file to use when compiling in order to improve // runtime performance. LLVM_PROFDATA_FILE:FILEPATH= //Path to a library. LLVM_PTHREAD_LIBRARY_PATH:FILEPATH=/usr/lib/x86_64-linux-gnu/libpthread.so //Value Computed by CMake LLVM_SOURCE_DIR:STATIC=/usr/local/google/home/blaikie/dev/llvm/src //Native TableGen executable. Saves building one when cross-compiling. LLVM_TABLEGEN:STRING=llvm-...