View Source: -Wall - Waikato Linux Users Group

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When running [gcc(1)], [-Wall] is the [CommandLine] option that enables all warnings. Generally the first thing people will look for when debugging or helping others with [C]/[C++] code is that it compiles with [-Wall].

[-Wall] warns about a great many things which are normally harmless in normal circumstances but can be dangerous at others. __-pedantic__ also warns against things that are technically wrong but cannot lead to problems for [gcc(1)]  and __-pedantic-errors__ issues errors for such quibbles. __-pedantic__ and __-pedantic-errors__ are not usually used unless the code is being written with the intention of porting it to exotic hardware, as a last ditch attempt to find an elusive bug or as a method of evaluating the quality of code (StuartYeates always uses these flags when marking [C]/[C++] assignments).

It is often a good idea to add [-Wall] to your __CFLAGS__ environment variable. The second thing to do after adding [-Wall] is to add __-g__ so you can get debugging symbols when your program crashes. Unlike  [-Wall], __-g__ can effect the RunTime performance of the generated programs so is not recommended when building core system components on a production system.

Many programmers have a line similar to
 export CFLAGS="-Wall -g"
in their __.profile__.

4 pages link to -Wall:

Last edited on Friday, September 18, 2009 8:31:46 am by "SpellingMan"

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