Add LZMA SDK.

3rdparty/lzma-21.03beta/CPP/7zip/warn_gcc.mak

@@ -0,0 +1,57 @@
+CFLAGS_WARN_GCC_4_5 = \
+
+CFLAGS_WARN_GCC_6 = \
+  -Waddress \
+  -Waggressive-loop-optimizations \
+  -Wattributes \
+  -Wbool-compare \
+  -Wcast-align \
+  -Wcomment \
+  -Wdiv-by-zero \
+  -Wduplicated-cond \
+  -Wformat-contains-nul \
+  -Winit-self \
+  -Wint-to-pointer-cast \
+  -Wunused \
+  -Wunused-macros \
+
+#  -Wno-strict-aliasing
+
+CFLAGS_WARN_GCC_9 = \
+  -Waddress \
+  -Waddress-of-packed-member \
+  -Waggressive-loop-optimizations \
+  -Wattributes \
+  -Wbool-compare \
+  -Wbool-operation \
+  -Wcast-align \
+  -Wcast-align=strict \
+  -Wcomment \
+  -Wdangling-else \
+  -Wdiv-by-zero \
+  -Wduplicated-branches \
+  -Wduplicated-cond \
+  -Wformat-contains-nul \
+  -Wimplicit-fallthrough=5 \
+  -Winit-self \
+  -Wint-in-bool-context \
+  -Wint-to-pointer-cast \
+  -Wunused \
+  -Wunused-macros \
+  -Wconversion \
+
+#  -Wno-sign-conversion \
+
+CFLAGS_WARN_GCC_10 = $(CFLAGS_WARN_GCC_9) \
+  -Wmaybe-uninitialized \
+  -Wmisleading-indentation \
+
+CFLAGS_WARN_GCC_PPMD_UNALIGNED = \
+  -Wno-strict-aliasing \
+
+
+CFLAGS_WARN = $(CFLAGS_WARN_GCC_9) \
+
+#  $(CFLAGS_WARN_GCC_PPMD_UNALIGNED)
+
+