Enforce Werror when building samples on Linux

Signed-off-by: Ming-Wei Shih <mishih@microsoft.com>

enclave/core/CMakeLists.txt

@@ -275,7 +275,11 @@ if (OE_SGX)
     # user. There are valid reasons for an end user to use built-ins.
     $<BUILD_INTERFACE:-fno-builtin-malloc
     -fno-builtin-calloc
-    -fno-builtin>)
+    -fno-builtin>
+    # Treat warnings as errors by default. Application based on OE SDK
+    # will inhere this flag, which is consistent to the behavior of the
+    # clangw script.
+    -Werror)
 elseif (OE_TRUSTZONE)
   enclave_compile_options(oecore PUBLIC -fvisibility=hidden ${OE_TZ_TA_C_FLAGS})
 endif ()

pkgconfig/CMakeLists.txt

@@ -31,7 +31,10 @@ set(ENCLAVE_CFLAGS_LIST
     -fstack-protector-strong
     -fno-omit-frame-pointer
     -ffunction-sections
-    -fdata-sections)
+    -fdata-sections
+    # Treat warnings as errors by default, which is consistent to the behavior
+    # of the clangw script.
+    -Werror)
 
 set(ENCLAVE_CFLAGS_CLANG_LIST ${ENCLAVE_CFLAGS_LIST}
                               ${SPECTRE_MITIGATION_FLAGS})
@@ -214,10 +217,15 @@ endfunction ()
 ##
 ##==============================================================================
 
-set(PACKAGE_CONFIG_FILES_LIST oehost-gcc.pc oehost-g++.pc
-                              oehost-clang.pc oehost-clang++.pc
-                              oeenclave-gcc.pc oeenclave-g++.pc
-                              oeenclave-clang.pc oeenclave-clang++.pc)
+set(PACKAGE_CONFIG_FILES_LIST
+    oehost-gcc.pc
+    oehost-g++.pc
+    oehost-clang.pc
+    oehost-clang++.pc
+    oeenclave-gcc.pc
+    oeenclave-g++.pc
+    oeenclave-clang.pc
+    oeenclave-clang++.pc)
 
 ##==============================================================================
 ##
@@ -236,8 +244,8 @@ set(LVI_MITIGATION_PACKAGE_CONFIG_FILES_LIST
 ##==============================================================================
 
 set(HOST_VERIFY_PACKAGE_CONFIG_FILES_LIST
-    oehostverify-gcc.pc oehostverify-g++.pc
-    oehostverify-clang.pc oehostverify-clang++.pc)
+    oehostverify-gcc.pc oehostverify-g++.pc oehostverify-clang.pc
+    oehostverify-clang++.pc)
 
 foreach (file_name ${PACKAGE_CONFIG_FILES_LIST})
   configure_and_install_pkg_config(${file_name} "")