What are the optimal compiler warning levels for different C/C compilers?

Optimal Compiler Warning Level for C/C

Various C/C compilers offer different warning levels, influencing the amount and severity of warnings reported during compilation. Here are some recommended warning levels for different compilers:

GCC/G :

For GCC and G , the recommended level is '-Wall'. This enables all warnings that the compiler deems relevant to potential errors or poor coding practices.

Sun CC:

For Sun CC, '-xlist=custom' is recommended, with the following warning flags:

• -xtype
• -xtype=boundcheck
• -xtype=fullbounds
• -xtypespace=follow
• -xtype=uninitialized

aCC (HPUX):

For aCC, '-qwarn all=on2' is advised. This enables all available warnings, including the highest severity level.

Visual Studio:

For Visual Studio, '/W4' is recommended. This setting enables all warnings except those that are considered by the compiler to be too noisy or potentially confusing.

Intel:

For Intel C/C compilers, '-Wall' is a good starting point. Additional specific warnings can be enabled as needed, such as '-Wselect-any-enum-values' or '-Wno-unused-value'.

GCC/G Extra-Paranoid Flags:

For extreme vigilance, the following set of flags can be used in addition to '-Wall':

 -Weffc++ -pedantic -pedantic-errors -Wextra -Waggregate-return -Wcast-align \
    -Wcast-qual  -Wchar-subscripts  -Wcomment -Wconversion \
    -Wdisabled-optimization \
    -Werror -Wfloat-equal  -Wformat  -Wformat=2 \
    -Wformat-nonliteral -Wformat-security  \
    -Wformat-y2k \
    -Wimplicit  -Wimport  -Winit-self  -Winline \
    -Winvalid-pch   \
    -Wunsafe-loop-optimizations  -Wlong-long -Wmissing-braces \
    -Wmissing-field-initializers -Wmissing-format-attribute   \
    -Wmissing-include-dirs -Wmissing-noreturn \
    -Wpacked  -Wpadded -Wparentheses  -Wpointer-arith \
    -Wredundant-decls -Wreturn-type \
    -Wsequence-point  -Wshadow -Wsign-compare  -Wstack-protector \
    -Wstrict-aliasing -Wstrict-aliasing=2 -Wswitch  -Wswitch-default \
    -Wswitch-enum -Wtrigraphs  -Wuninitialized \
    -Wunknown-pragmas  -Wunreachable-code -Wunused \
    -Wunused-function  -Wunused-label  -Wunused-parameter \
    -Wunused-value  -Wunused-variable  -Wvariadic-macros \
    -Wvolatile-register-var  -Wwrite-strings

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