Compiler options for GCC, clang and tcc

tests/SConstruct

@@ -1,5 +1,26 @@
+Help('''
+Type 'scons' to build and run all the available test cases.
+It will automatically detect your platform and C compiler and
+build appropriately.
+
+You can modify the behavious using following options:
+CC          Name of C compiler
+CXX         Name of C++ compiler
+CCFLAGS     Flags to pass to the C compiler
+CXXFLAGS    Flags to pass to the C++ compiler
+
+For example, for a clang build, use:
+scons CC=clang CXX=clang++
+''')
+
 import os
-env = Environment(ENV = {'PATH': os.environ['PATH']})
+env = Environment(ENV = os.environ)
+
+# Allow overriding the compiler with scons CC=???
+if 'CC' in ARGUMENTS: env.Replace(CC = ARGUMENTS['CC'])
+if 'CXX' in ARGUMENTS: env.Replace(CXX = ARGUMENTS['CXX'])
+if 'CFLAGS' in ARGUMENTS: env.Append(CCFLAGS = ARGUMENTS['CFLAGS'])
+if 'CXXFLAGS' in ARGUMENTS: env.Append(CCFLAGS = ARGUMENTS['CXXFLAGS'])
 
 # Add the builders defined in site_init.py
 add_nanopb_builders(env)
@@ -34,22 +55,54 @@ if not env.GetOption('clean'):
         conf.env.Append(PROTOCPATH = output.strip())
     else:
         conf.env.Append(PROTOCPATH = '/usr/include')
-        
+    
+    # Check if libmudflap is available (only with GCC)
+    if 'gcc' in env['CC']:
+        if conf.CheckLib('mudflap'):
+            conf.env.Append(CCFLAGS = '-fmudflap')
+            conf.env.Append(LINKFLAGS = '-lmudflap -fmudflap')
+    
     # End the config stuff
     env = conf.Finish()
 
 # Initialize the CCFLAGS according to the compiler
-if 'cl' in env['CC']:
+if 'gcc' in env['CC']:
+    # GNU Compiler Collection
+    
+    # Debug info, warnings as errors
+    env.Append(CFLAGS = '-ansi -g -O0 -Wall -Werror --coverage -fstack-protector-all')
+    env.Append(LINKFLAGS = '--coverage')
+    
+    # More strict checks on the nanopb core
+    env.Append(CORECFLAGS = '-pedantic -Wextra -Wcast-qual -Wlogical-op -Wconversion')
+elif 'clang' in env['CC']:
+    # CLang
+    env.Append(CFLAGS = '-ansi -g -O0 -Wall -Werror')
+    env.Append(CORECFLAGS = '-pedantic -Wextra -Wcast-qual -Wconversion')
+elif 'cl' in env['CC']:
     # Microsoft Visual C++
     
     # Debug info on, warning level 2 for tests, warnings as errors
-    env.Append(CCFLAGS = '/Zi /W2 /WX')
+    env.Append(CFLAGS = '/Zi /W2 /WX')
     env.Append(LINKFLAGS = '/DEBUG')
     
+    # More strict checks on the nanopb core
+    env.Append(CORECFLAGS = '/W4 /Za')
+    
     # PB_RETURN_ERROR triggers C4127 because of while(0)
-    env.Append(CCFLAGS = '/wd4127')
-    
-    
+    env.Append(CFLAGS = '/wd4127')
+elif 'tcc' in env['CC']:
+    # Tiny C Compiler
+    env.Append(CFLAGS = '-Wall -Werror -g')
+
+env.SetDefault(CORECFLAGS = '')
+
+if 'clang++' in env['CXX']:
+    env.Append(CXXFLAGS = '-g -O0 -Wall -Werror -Wextra -Wno-missing-field-initializers')
+elif 'g++' in env['CXX']:
+    env.Append(CXXFLAGS = '-g -O0 -Wall -Werror -Wextra -Wno-missing-field-initializers')
+elif 'cl' in env['CXX']:
+    env.Append(CXXFLAGS = '/Zi /W2 /WX')
     
 # Now include the SConscript files from all subdirectories
 SConscript(Glob('*/SConscript'), exports = 'env')

tests/common/SConscript

@@ -9,6 +9,9 @@ env.NanopbProto("unittestproto")
 env.NanopbProto("person")
 
 # Binaries of the pb_decode.c and pb_encode.c
-env.Object("pb_decode.o", "#../pb_decode.c")
-env.Object("pb_encode.o", "#../pb_encode.c")
+# These are built using more strict warning flags.
+strict = env.Clone()
+strict.Append(CFLAGS = strict['CORECFLAGS'])
+strict.Object("pb_decode.o", "#../pb_decode.c")
+strict.Object("pb_encode.o", "#../pb_encode.c")