pgo-training: Add a script for doing PGO training of a toolchain

Use a makefile for running a set of commands in parallel.

pgo-training.sh

@@ -0,0 +1,63 @@
+#!/bin/sh
+#
+# Copyright (c) 2025 Martin Storsjo
+#
+# Permission to use, copy, modify, and/or distribute this software for any
+# purpose with or without fee is hereby granted, provided that the above
+# copyright notice and this permission notice appear in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+set -e
+
+: ${SQLITE_VERSION:=3490200}
+: ${SQLITE_YEAR:=2025}
+
+: ${LLVM_PROFILE_DATA_DIR:=/tmp/llvm-profile}
+: ${LLVM_PROFDATA_FILE:=profile.profdata}
+
+if [ $# -lt 2 ]; then
+    echo $0 build stage1
+    exit 1
+fi
+PREFIX="$1"
+STAGE1="$2"
+PREFIX="$(cd "$PREFIX" && pwd)"
+
+MAKE=make
+if command -v gmake >/dev/null; then
+    MAKE=gmake
+fi
+
+: ${CORES:=$(nproc 2>/dev/null)}
+: ${CORES:=$(sysctl -n hw.ncpu 2>/dev/null)}
+: ${CORES:=4}
+: ${ARCHS:=${TOOLCHAIN_ARCHS-i686 x86_64 armv7 aarch64}}
+
+download() {
+    if command -v curl >/dev/null; then
+        curl -LO "$1"
+    else
+        wget "$1"
+    fi
+}
+
+SQLITE=sqlite-amalgamation-$SQLITE_VERSION
+if [ ! -d $SQLITE ]; then
+    download https://sqlite.org/$SQLITE_YEAR/sqlite-amalgamation-$SQLITE_VERSION.zip
+    unzip sqlite-amalgamation-$SQLITE_VERSION.zip
+fi
+
+rm -rf "$LLVM_PROFILE_DATA_DIR"
+$MAKE -f pgo-training.make PREFIX=$PREFIX STAGE1=$STAGE1 SQLITE=$SQLITE clean
+$MAKE -f pgo-training.make PREFIX=$PREFIX STAGE1=$STAGE1 SQLITE=$SQLITE -j$CORES
+
+rm -f "$LLVM_PROFDATA_FILE"
+$STAGE1/bin/llvm-profdata merge -output "$LLVM_PROFDATA_FILE" $LLVM_PROFILE_DATA_DIR/*.profraw
+rm -rf "$LLVM_PROFILE_DATA_DIR"