Backport build modes from 1.3
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 824624d..ebb29cd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,24 +6,35 @@
 string(REGEX MATCH "Clang" CMAKE_COMPILER_IS_CLANG "${CMAKE_C_COMPILER_ID}")
 
 if(CMAKE_COMPILER_IS_GNUCC)
-  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -W -Wdeclaration-after-statement")
-  set(CMAKE_C_FLAGS_RELEASE "-O2")
-  set(CMAKE_C_FLAGS_DEBUG "-g3 -O0")
-  set(CMAKE_C_FLAGS_COVERAGE "-g3 -O0 -fprofile-arcs -ftest-coverage -lgcov")
-  set(CMAKE_C_FLAGS_CHECK "${CMAKE_C_FLAGS} -Werror -Wlogical-op -Wwrite-strings")
+  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -W -Wdeclaration-after-statement -Wwrite-strings -Wlogical-op")
+  set(CMAKE_C_FLAGS_RELEASE     "-O2")
+  set(CMAKE_C_FLAGS_DEBUG       "-O0 -g3")
+  set(CMAKE_C_FLAGS_COVERAGE    "-O0 -g3 --coverage")
+  set(CMAKE_C_FLAGS_ASAN        "-Werror -fsanitize=address -fno-common -O3")
+  set(CMAKE_C_FLAGS_ASANDBG     "-Werror -fsanitize=address -fno-common -O1 -g3 -fno-omit-frame-pointer -fno-optimize-sibling-calls ")
+  set(CMAKE_C_FLAGS_CHECK       "-Werror -O1")
+  set(CMAKE_C_FLAGS_CHECKFULL   "${CMAKE_C_FLAGS_CHECK} -Wcast-qual")
 endif(CMAKE_COMPILER_IS_GNUCC)
 
 if(CMAKE_COMPILER_IS_CLANG)
-  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -W -Wdeclaration-after-statement")
-  set(CMAKE_C_FLAGS_RELEASE "-O2")
-  set(CMAKE_C_FLAGS_DEBUG "-g3 -O0")
-  set(CMAKE_C_FLAGS_CHECK "${CMAKE_C_FLAGS} -Werror -Wpointer-arith -Wwrite-strings -Wdocumentation")
+  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -W -Wdeclaration-after-statement -Wwrite-strings -Wpointer-arith")
+  set(CMAKE_C_FLAGS_RELEASE     "-O2")
+  set(CMAKE_C_FLAGS_DEBUG       "-O0 -g3")
+  set(CMAKE_C_FLAGS_COVERAGE    "-O0 -g3 --coverage")
+  set(CMAKE_C_FLAGS_ASAN        "-Werror -fsanitize=address -fno-common -fsanitize=undefined -fno-sanitize-recover -O3")
+  set(CMAKE_C_FLAGS_ASANDBG     "-Werror -fsanitize=address -fno-common -fsanitize=undefined -fno-sanitize-recover -O1 -g3 -fno-omit-frame-pointer -fno-optimize-sibling-calls ")
+  set(CMAKE_C_FLAGS_MEMSAN      "-Werror -fsanitize=memory -O3")
+  set(CMAKE_C_FLAGS_MEMSANDBG   "-Werror -fsanitize=memory -O1 -g3 -fno-omit-frame-pointer -fno-optimize-sibling-calls -fsanitize-memory-track-origins=2")
+  set(CMAKE_C_FLAGS_CHECK       "-Werror -O1")
 endif(CMAKE_COMPILER_IS_CLANG)
 
 if(CMAKE_BUILD_TYPE STREQUAL "Coverage")
   if(CMAKE_COMPILER_IS_GNUCC)
-    set(CMAKE_SHARED_LINKER_FLAGS "-fprofile-arcs -ftest-coverage")
+    set(CMAKE_SHARED_LINKER_FLAGS "--coverage")
   endif(CMAKE_COMPILER_IS_GNUCC)
+  if(CMAKE_COMPILER_IS_CLANG)
+    set(CMAKE_SHARED_LINKER_FLAGS "--coverage")
+  endif(CMAKE_COMPILER_IS_CLANG)
 endif(CMAKE_BUILD_TYPE STREQUAL "Coverage")
 
 option(USE_PKCS11_HELPER_LIBRARY "Build PolarSSL with the pkcs11-helper library." OFF)
diff --git a/library/CMakeLists.txt b/library/CMakeLists.txt
index 1142980..17d6507 100644
--- a/library/CMakeLists.txt
+++ b/library/CMakeLists.txt
@@ -54,10 +54,13 @@
 endif(WIN32)
 
 if(CMAKE_COMPILER_IS_GNUCC)
-  set(CMAKE_C_FLAGS_CHECK "${CMAKE_C_FLAGS_CHECK} -Wmissing-declarations -Wmissing-prototypes")
-  set(CMAKE_C_FLAGS_CHECKFULL "${CMAKE_C_FLAGS_CHECK} -Wcast-qual")
+  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wmissing-declarations -Wmissing-prototypes")
 endif(CMAKE_COMPILER_IS_GNUCC)
 
+if(CMAKE_COMPILER_IS_CLANG)
+  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wmissing-declarations -Wmissing-prototypes -Wdocumentation -Wunreachable-code")
+endif(CMAKE_COMPILER_IS_CLANG)
+
 if (NOT USE_STATIC_POLARSSL_LIBRARY AND NOT USE_SHARED_POLARSSL_LIBRARY)
 	message(FATAL_ERROR "Need to choose static or shared polarssl build!")
 endif(NOT USE_STATIC_POLARSSL_LIBRARY AND NOT USE_SHARED_POLARSSL_LIBRARY)
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 1b8ff0f..62a2468 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -29,8 +29,7 @@
     add_test(${data_name}-suite test_suite_${data_name})
 endfunction(add_test_suite)
 
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-unused-function -Wno-unused-value")
-set(CMAKE_C_FLAGS_CHECK "${CMAKE_C_FLAGS_CHECK} -Wno-unused-function -Wno-unused-value")
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-unused-function")
 
 add_test_suite(aes aes.ecb)
 add_test_suite(aes aes.cbc)