On Thu, 21 Mar 2019 at 09:07, Zbigniew Jędrzejewski-Szmek
<[email protected]> wrote:
[..]
> The effect of "-Wformat -Wformat-security" without -Werror is only more
> warnings.
> Unfortunately -Wformat will generate spurious warnings if the code is
> not careful to give additional information to the compiler with
> __attribute__((__format__(printf))) and friends. And even that sometimes
> not enough, and explicit #pragma GCC diagnostic ignored "-Wformat-nonliteral"
> is needed. So all in all, it is totally expected that code which is not
> written with recent gcc in mind will generate spurious format warnings, even
> if the code is completely OK. So turning this on will make builds more
> noisy, and possibly break projects which use -Werror.
Even gcc themselves "is not written with recent gcc in mind".
$ grep '\[\-W' gcc.log| awk -F\[ '{print $2}'|awk -F\] '{print
$1}'|sort | uniq -c | sort -nr| head -n 20
485 -Wmissing-profile
106 -Wformat-security
81 -Wmaybe-uninitialized
44 -Wimplicit-fallthrough=
24 -Wunused-function
20 -Wpointer-sign
20 -Wimplicit-function-declaration
19 -Wstringop-truncation
8 -Wformat-truncation=
8 -Wcast-qual
7 -Wcast-function-type
4 -Wcpp
4 -Wbuiltin-declaration-mismatch
3 -Wparentheses
2 -Wunused-value
2 -Wunused-parameter
2 -Wmissing-prototypes
2 -Wmisleading-indentation
2 -Wint-to-pointer-cast
2 -Wdiscarded-qualifiers
BTW: each Fedora package build should have as part of the build report
something like above.
kloczek
--
Tomasz Kłoczko | LinkedIn: http://lnkd.in/FXPWxH
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