termux-tools: Enable compiler warnings and fix them

packages/termux-tools/build.sh

@@ -3,7 +3,7 @@ TERMUX_PKG_DESCRIPTION="Some tools for Termux"
 TERMUX_PKG_VERSION=0.5
 
 termux_step_make_install () {
-	$CXX $CFLAGS $LDFLAGS -std=c++14 $TERMUX_PKG_BUILDER_DIR/*.cpp -o $TERMUX_PREFIX/bin/termux-elf-cleaner
+	$CXX $CFLAGS $LDFLAGS -std=c++14 -Wall -Wextra -pedantic -Werror $TERMUX_PKG_BUILDER_DIR/*.cpp -o $TERMUX_PREFIX/bin/termux-elf-cleaner
 
 	rm -f $TERMUX_PREFIX/bin/{am,termux-user,termux-fix-shebang,termux-reload-style,chsh,termux-open-url}
 	cp $TERMUX_PKG_BUILDER_DIR/{am,termux-user,termux-fix-shebang,termux-reload-style,chsh,termux-open-url} $TERMUX_PREFIX/bin/

packages/termux-tools/termux-elf-cleaner.cpp

@@ -59,18 +59,14 @@ bool process_elf(uint8_t* bytes, size_t elf_file_size)
 
 			for (unsigned int j = 0; j < dynamic_section_entries; j++) {
 				ElfDynamicSectionEntryType* dynamic_section_entry = dynamic_section + j;
-				switch (dynamic_section_entry->d_tag) {
-					case DT_VERNEEDED:
-					case DT_VERNEEDNUM:
-					case DT_RPATH:
-					case DT_RUNPATH:
-						char const* removed_name;
+				char const* removed_name = nullptr;
 				switch (dynamic_section_entry->d_tag) {
 					case DT_VERNEEDED: removed_name = "DT_VERNEEDED"; break;
 					case DT_VERNEEDNUM: removed_name = "DT_VERNEEDNUM"; break;
 					case DT_RPATH: removed_name = "DT_RPATH"; break;
 					case DT_RUNPATH: removed_name = "DT_RUNPATH"; break;
 				}
+				if (removed_name != nullptr) {
 					printf("Removing the %s dynamic section entry\n", removed_name);
 					// Tag the entry with DT_NULL and put it last:
 					dynamic_section_entry->d_tag = DT_NULL;