Fix small CI failures

1) Only access UCI option if defined
2) disable -Werror for now.
3) disable a few target that don't have _mm_malloc.
4) Add profile-learn target, with small speedup.
5) just test on Linux + gcc (skip macOS, unclear openblas, skip linux+clang, unclear omp/std::filesystem).

src/Makefile

@@ -40,7 +40,7 @@ BINDIR = $(PREFIX)/bin
 
 ### Built-in benchmark for pgo-builds
 PGOBENCH = ./$(EXE) bench
-PGOGENSFEN = ./$(EXE) gensfen depth 3 loop 100000
+PGOGENSFEN = ./$(EXE) gensfen depth 3 loop 1000
 
 ### Source and object files
 SRCS = benchmark.cpp bitbase.cpp bitboard.cpp endgame.cpp evaluate.cpp main.cpp \
@@ -908,7 +908,7 @@ learn: config-sanity
 	EXTRALDFLAGS=' $(BLASLDFLAGS) -fopenmp  ' \
 	all
 
-profile-learn: config-sanity objclean profileclean
+profile-learn: net config-sanity objclean profileclean
 	@echo ""
 	@echo "Step 1/4. Building instrumented executable ..."
 	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) $(profile_make) \

src/nnue/evaluate_nnue.cpp

@@ -184,11 +184,13 @@ namespace Eval::NNUE {
 
     Initialize();
 
+#if defined(EVAL_NNUE)
     if (Options["SkipLoadingEval"])
     {
       std::cout << "info string SkipLoadingEval set to true, Net not loaded!" << std::endl;
       return true;
     }
+#endif
 
     fileName = evalFile;
 

src/ucioption.cpp

@@ -96,7 +96,7 @@ void init(OptionsMap& o) {
 #if defined(EVAL_LEARN)
   // When learning the evaluation function, you can change the folder to save the evaluation function.
   // Evalsave by default. This folder shall be prepared in advance.
-  // Automatically dig a folder under this folder like "0/", "1/", ... and save the evaluation function file there.
+  // Automatically create a folder under this folder like "0/", "1/", ... and save the evaluation function file there.
   o["EvalSaveDir"] << Option("evalsave");
 #endif
 }