tlbuild: --enable-compiler-warnings=LEVEL

 
 7.1.5 '--enable-compiler-warnings='LEVEL
 ----------------------------------------
 
 Enable various levels of compiler warnings for C, C++, and/or
 Objective C: the LEVEL value can be one of: 'no min yes max all'.  The
 default is 'yes' in 'maintainer-mode' (see below) and 'min' otherwise.
 This option defines the variables 'WARNING_[OBJ]C[XX]FLAGS', but these
 variables are not consistently used in all library and program modules.
 At present, these warning flags assume options from the GNU compilers.