tlbuild: --enable-compiler-warnings=LEVEL
7.1.5 '--enable-compiler-warnings='LEVEL
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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.