Add a script for building a PGO'd binary

CMakeLists.txt

@@ -233,8 +233,8 @@ if(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
   add_link_options("$<$<BOOL:${DEVILUTIONX_PROFILE_GENERATE}>:-fprofile-generate>")
   add_compile_options("$<$<BOOL:${DEVILUTIONX_PROFILE_USE}>:-fprofile-use>")
   add_link_options("$<$<BOOL:${DEVILUTIONX_PROFILE_USE}>:-fprofile-use>")
-  add_compile_options("$<$<BOOL:${DEVILUTIONX_PROFILE_DIR}>:-fprofile-dir=${DEVILUTIONX_PROFILE_DIR}>")
-  add_link_options("$<$<BOOL:${DEVILUTIONX_PROFILE_DIR}>:-fprofile-dir=${DEVILUTIONX_PROFILE_DIR}>")
+  add_compile_options("$<$<BOOL:${DEVILUTIONX_PROFILE_DIR}>:-fprofile-dir=${DEVILUTIONX_PROFILE_DIR};-fprofile-prefix-path=${CMAKE_CURRENT_BINARY_DIR}>")
+  add_link_options("$<$<BOOL:${DEVILUTIONX_PROFILE_DIR}>:-fprofile-dir=${DEVILUTIONX_PROFILE_DIR};-fprofile-prefix-path=${CMAKE_CURRENT_BINARY_DIR}>")
 endif()
 
 # Not a genexp because CMake doesn't support it

Packaging/OpenDingux/build.sh

@@ -110,7 +110,6 @@ parse_args() {
 			"-DDEVILUTIONX_PROFILE_GENERATE=ON"
 			"-DDEVILUTIONX_PROFILE_DIR=${PROFILE_DIR}"
 		)
-		BUILD_TYPE=relwithdebinfo
 		OPK_DESKTOP_NAME="DevilutionX PG"
 		OPK_DESKTOP_EXEC="profile-generate.sh"
 		OPK_EXTRA_FILES=(

tools/build_pgo.sh

@@ -0,0 +1,36 @@
+#!/usr/bin/env bash
+
+# Builds a PGO-optimized binary with the profile data gathered by running the test demo.
+set -euo pipefail
+
+PARALLELISM="$(getconf _NPROCESSORS_ONLN)"
+
+set -x
+
+rm -rf build-profile-data/config build-profile-data/profile
+mkdir -p build-profile-data/config
+cd build-profile-data/config
+ln -s ../../test/fixtures/timedemo/WarriorLevel1to2/demo_* .
+cp ../../test/fixtures/timedemo/WarriorLevel1to2/spawn_* .
+cd -
+
+# We build both versions with the same FetchContent base directory because otherwise
+# gcc will complain about the source locations for FetchContent dependencies,
+# which are stored in the build directory by default.
+# Ideally, we would only specify the location for the FetchContent src directories
+# but CMake does not support that.
+cmake -S. -Bbuild-profile-generate -G Ninja -DCMAKE_BUILD_TYPE=Release \
+  -DDEVILUTIONX_PROFILE_GENERATE=ON \
+  -DDEVILUTIONX_PROFILE_DIR="${PWD}/build-profile-data/profile" \
+  -DFETCHCONTENT_BASE_DIR="${PWD}/build-profile-data/fetchcontent-base" \
+  -DBUILD_TESTING=OFF "$@"
+cmake --build build-profile-generate -j "$PARALLELISM"
+build-profile-generate/devilutionx --diablo --spawn --lang en --demo 0 --timedemo \
+  --save-dir build-profile-data/config
+
+cmake -S. -Bbuild-profile-use -G Ninja -DCMAKE_BUILD_TYPE=Release \
+  -DDEVILUTIONX_PROFILE_USE=ON \
+  -DDEVILUTIONX_PROFILE_DIR="${PWD}/build-profile-data/profile" \
+  -DFETCHCONTENT_BASE_DIR="${PWD}/build-profile-data/fetchcontent-base" \
+  -DBUILD_TESTING=OFF "$@"
+cmake --build build-profile-use -j "$PARALLELISM"