pythongh-101525: Fix make test if the --enable-bolt enabled

Makefile.pre.in

@@ -38,6 +38,7 @@ CC=		@CC@
 CXX=		@CXX@
 LINKCC=		@LINKCC@
 AR=		@AR@
+READELF=	@READELF@
 SOABI=		@SOABI@
 LDVERSION=	@LDVERSION@
 LIBPYTHON=	@LIBPYTHON@
@@ -670,13 +671,18 @@ profile-opt: profile-run-stamp
 
 bolt-opt: @PREBOLT_RULE@
 	rm -f *.fdata
-	@LLVM_BOLT@ ./$(BUILDPYTHON) -instrument -instrumentation-file-append-pid -instrumentation-file=$(abspath $(BUILDPYTHON).bolt) -o $(BUILDPYTHON).bolt_inst
-	./$(BUILDPYTHON).bolt_inst $(PROFILE_TASK) || true
-	@MERGE_FDATA@ $(BUILDPYTHON).*.fdata > $(BUILDPYTHON).fdata
-	@LLVM_BOLT@ ./$(BUILDPYTHON) -o $(BUILDPYTHON).bolt -data=$(BUILDPYTHON).fdata -update-debug-sections -reorder-blocks=ext-tsp -reorder-functions=hfsort+ -split-functions -icf=1 -inline-all -split-eh -reorder-functions-use-hot-size -peepholes=none -jump-tables=aggressive -inline-ap -indirect-call-promotion=all -dyno-stats -use-gnu-stack -frame-opt=hot
-	rm -f *.fdata
-	rm -f $(BUILDPYTHON).bolt_inst
-	mv $(BUILDPYTHON).bolt $(BUILDPYTHON)
+	@if $(READELF) -p .note.bolt_info $(BUILDPYTHON) | grep BOLT > /dev/null; then\
+		echo "skip: $(BUILDPYTHON) is already BOLTed."; \
+	else \
+		@LLVM_BOLT@ ./$(BUILDPYTHON) -instrument -instrumentation-file-append-pid -instrumentation-file=$(abspath $(BUILDPYTHON).bolt) -o $(BUILDPYTHON).bolt_inst; \
+		./$(BUILDPYTHON).bolt_inst $(PROFILE_TASK) || true; \
+		@MERGE_FDATA@ $(BUILDPYTHON).*.fdata > $(BUILDPYTHON).fdata; \
+		@LLVM_BOLT@ ./$(BUILDPYTHON) -o $(BUILDPYTHON).bolt -data=$(BUILDPYTHON).fdata -update-debug-sections -reorder-blocks=ext-tsp -reorder-functions=hfsort+ -split-functions -icf=1 -inline-all -split-eh -reorder-functions-use-hot-size -peepholes=none -jump-tables=aggressive -inline-ap -indirect-call-promotion=all -dyno-stats -use-gnu-stack -frame-opt=hot; \
+		rm -f *.fdata; \
+		rm -f $(BUILDPYTHON).bolt_inst; \
+		mv $(BUILDPYTHON).bolt $(BUILDPYTHON); \
+	fi
+
 
 # Compile and run with gcov
 .PHONY=coverage coverage-lcov coverage-report

configure.ac

@@ -1938,6 +1938,13 @@ if test "$Py_BOLT" = 'true' ; then
   DEF_MAKE_ALL_RULE="bolt-opt"
   DEF_MAKE_RULE="build_all"
 
+  AC_SUBST(READELF)
+  AC_CHECK_TOOLS(READELF, [readelf], "notfound")
+  if test "$READELF" == "notfound"
+  then
+    AC_MSG_ERROR([readelf is required for a --enable-bolt build but could not be found.])
+  fi
+
   # -fno-reorder-blocks-and-partition is required for bolt to work.
   # Possibly GCC only.
   AX_CHECK_COMPILE_FLAG([-fno-reorder-blocks-and-partition],[