Fix gcc 9/10 & mapbase build errors

sp/src/devtools/gcc9+support.cpp

@@ -0,0 +1,59 @@
+// compatibility with old ABI
+#if __GNUC__ >= 9
+#include <cmath>
+
+extern "C" double __pow_finite(double a, double b)
+{
+	return pow(a, b);
+}
+
+extern "C" double __log_finite(double a)
+{
+	return log(a);
+}
+
+extern "C" double __exp_finite(double a)
+{
+	return exp(a);
+}
+
+extern "C" double __atan2_finite(double a, double b)
+{
+	return atan2(a, b);
+}
+
+extern "C" double __atan2f_finite(double a, double b)
+{
+	return atan2f(a, b);
+}
+
+extern "C" float __powf_finite(float a, float b)
+{
+	return powf(a, b);
+}
+
+extern "C" float __logf_finite(float a)
+{
+	return logf(a);
+}
+
+extern "C" float __expf_finite(float a)
+{
+	return expf(a);
+}
+
+extern "C" float __acosf_finite(float a)
+{
+	return acosf(a);
+}
+
+extern "C" double __asin_finite(double a)
+{
+	return asin(a);
+}
+
+extern "C" double __acos_finite(double a)
+{
+	return acos(a);
+}
+#endif

sp/src/devtools/makefile_base_posix.mak

@@ -8,6 +8,7 @@ MAKEFILE_LINK:=$(THISFILE).link
 
 $(MAKEFILE_LINK): $(shell which $(CC)) $(THISFILE)
 	if [ "$(shell printf "$(shell $(CC) -dumpversion)\n8" | sort -Vr | head -1)" = 8 ]; then \
+		$(COMPILE.cpp) -o gcc9+support.o gcc9+support.c ;\
 		ln -sf $(MAKEFILE_BASE).default $@ ;\
 	else \
 		ln -sf $(MAKEFILE_BASE).gcc8 $@ ;\

sp/src/devtools/makefile_base_posix.mak.gcc8

@@ -94,9 +94,9 @@ ifeq ($(OS),Linux)
 		# So symbols like _Z16ClearMultiDamagev should show up when you do "nm server_srv.so" in TF2.
 		STRIP_FLAGS = -x
 	endif
-	# core2 = MMX, SSE, SSE2, SSE3, SSSE3
-	MARCH_TARGET = core2
-	MTUNE_TARGET = sandybridge
+	# nocona = MMX, SSE, SSE2, SSE3
+	MARCH_TARGET = nocona
+	MTUNE_TARGET = generic
 
 	ifeq ($(CXX),clang++)
 		# Clang does not support -mfpmath=sse because it uses whatever
@@ -174,7 +174,7 @@ ifeq ($(OS),Linux)
 	LIB_END_EXE = -Wl,--end-group -lm -ldl $(LIBSTDCXX) -lpthread 
 
 	LIB_START_SHLIB = $(PATHWRAP) -static-libgcc -Wl,--start-group
-	LIB_END_SHLIB = -Wl,--end-group -lm -ldl $(LIBSTDCXXPIC) -lpthread -l:$(LD_SO) -Wl,--version-script=$(SRCROOT)/devtools/version_script.linux.txt
+	LIB_END_SHLIB = -Wl,--end-group $(SRCROOT)/devtools/gcc9+support.o -lm -ldl $(LIBSTDCXXPIC) -lpthread -l:$(LD_SO) -Wl,--version-script=$(SRCROOT)/devtools/version_script.linux.txt
 
 endif