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Use matching llvm-profdata

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when using multiple clang compilers in parallel, it is necessary to use
a matching llvm-profdata, as the profile data format may change between
versions. To use the proper llvm-profdata binary, the one in the same directory
as the compiler is used. This allows for code like:

```bash
echo "Compiling clang"
for comp in clang++-11 clang++-12 clang++-13 clang++-14  clang++-15  clang++-16  clang++-17 clang++-18 clang++-19 clang++-20
do
   make -j profile-build CXX=$comp COMP=clang >& out.compile.$comp
   mv stockfish stockfish.$comp
done
```

after installing the required versions with the automatic installation script (https://apt.llvm.org/)

closes https://github.com/official-stockfish/Stockfish/pull/5958

No functional change
This commit is contained in:
Joost VandeVondele
2025-03-31 08:15:10 +02:00
parent 3d18ad719b
commit f9459e4c8e
1 changed files with 10 additions and 1 deletions
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11
src/Makefile
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@@ -567,6 +567,15 @@ ifeq ($(COMP),ndk)
LDFLAGS += -static-libstdc++ -pie -lm -latomic
endif
# llvm-profdata must be version compatible with the specified CXX (be it clang, or the gcc alias)
# make -j profile-build CXX=clang++-20 COMP=clang
# Locate the version in the same directory as the compiler used,
# with fallback to a generic one if it can't be located
LLVM_PROFDATA := $(dir $(realpath $(shell which $(CXX))))llvm-profdata
ifeq ($(wildcard $(LLVM_PROFDATA)),)
LLVM_PROFDATA := llvm-profdata
endif
ifeq ($(comp),icx)
profile_make = icx-profile-make
profile_use = icx-profile-use
@@ -1081,7 +1090,7 @@ clang-profile-make:
all
clang-profile-use:
$(XCRUN) llvm-profdata merge -output=stockfish.profdata *.profraw
$(XCRUN) $(LLVM_PROFDATA) merge -output=stockfish.profdata *.profraw
$(MAKE) ARCH=$(ARCH) COMP=$(COMP) \
EXTRACXXFLAGS='-fprofile-use=stockfish.profdata' \
EXTRALDFLAGS='-fprofile-use ' \