meson: add all* CFLAGS from travis-autogen.sh

Add all the flags, apart from -Werror and -fdiagnostics-color=auto.

We don't want for the former in the default build, but for developer,
maintainer and/or CI builds ... Some patches adding CI, fixing the
warnings, etc will be coming later on.

The latter overrides the default color handling, so we cannot see them
pretty colo(u)rs ;-P

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>

meson.build

@@ -17,16 +17,42 @@ cc = meson.get_compiler('c')
 
 add_project_arguments(
   cc.get_supported_arguments([
+    '-Wbad-function-cast',
+  #  '-Wcast-align',
     '-Wchar-subscripts',
+  #  '-Wempty-body',
     '-Wformat=2',
+  #  '-Wformat',
+  #  '-Wformat-nonliteral',
+  #  '-Wformat-security',
+  #  '-Wformat-y2k',
+    '-Winit-self',
+    '-Winline',
     '-Wmissing-declarations',
+    '-Wmissing-include-dirs',
     '-Wmissing-prototypes',
     '-Wnested-externs',
+    '-Wold-style-definition',
     '-Wpointer-arith',
+    '-Wredundant-decls',
     '-Wshadow',
     '-Wsign-compare',
     '-Wstrict-prototypes',
+    '-Wswitch-enum',
     '-Wtype-limits',
+    '-Wundef',
+    '-Wuninitialized',
+    '-Wunused',
+    '-Wunused-variable',
+    '-Wwrite-strings',
+    '-fdiagnostics-color=auto',
+    # warnings disabled on purpose
+    '-Wno-unused-parameter',
+    '-Wno-unused-function',
+    '-Wno-deprecated-declarations',
+    # should be removed and the code fixed
+    '-Wno-incompatible-pointer-types-discards-qualifiers',
+    '-Wno-missing-field-initializers',
   ]),
   language: 'c',
 )