Switch to building with C11

Signed-off-by: Peter Collingbourne <pcc@google.com>

Author: pcc

records/tools/armcc.yaml

@@ -13,7 +13,7 @@ tool_specific:
                 - -O2
                 - -Ospace
                 - --gnu
-                - --c99
+                - --c11
                 - --asm
                 - --split_sections
                 - --interleave
@@ -37,7 +37,7 @@ tool_specific:
             c_flags:
                 # uvision.uvproj.tmpl specifies:
                 # - O2, space
-                # - C99
+                # - C11
                 # - split sections
                 - --gnu
                 - --asm

records/tools/armclang.yaml

@@ -18,7 +18,7 @@ tool_specific:
                 - --target=arm-arm-none-eabi
                 - -Oz
                 - -g
-                - --std=c99
+                - --std=c11
                 - -fdata-sections
                 - -ffunction-sections
                 - -fno-builtin

records/tools/gcc_arm.yaml

@@ -17,7 +17,7 @@ tool_specific:
                 - -Werror
                 - -ffunction-sections
                 - -fdata-sections
-                - -std=gnu99
+                - -std=gnu11
                 - -fshort-wchar
                 - -fno-common
                 - -ffreestanding

records/tools/uvision.uvproj.tmpl

@@ -356,7 +356,7 @@
             <wLevel>0</wLevel>
             <uThumb>0</uThumb>
             <uSurpInc>0</uSurpInc>
-            <uC99>1</uC99>
+            <uC99>2</uC99>
             <useXO>0</useXO>
             <VariousControls>
               <MiscControls></MiscControls>