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Re: [Tinycc-devel] -Werror=X (but ugly)

From: grischka
Subject: Re: [Tinycc-devel] -Werror=X (but ugly)
Date: Wed, 28 Jul 2021 13:12:36 +0200
User-agent: Thunderbird (Windows/20090812)

Steffen Nurpmeso wrote:
 |      gcc -Wwrite-strings -Werror=discarded-qualifiers

Hm.  Well then this part is not compatible it seems.

Not compatible and cannot work:

    const char *xxx = "123"; /* no warning or error here */
    foo(); /* nobody said we would want this to stop */

    $ tcc -Werror=write-strings ...
    test.c:8: error: implicit declaration of function 'foo'

Because -Wwrite-strings is NOT a warning option, really.

And with
    const char *xxx = "123";
tcc would complain the "discarded const qualifier" but it cannot
track variables and code flow at compile-time in order to know
that some pointer came from a string, originally.

Forget it.

I have never
tested it that much, i usually step in when somewhere the build
fails or spits warnings like grazy.  Actually i have given up on
managing the mess that happens from compiler development.

Yes, the mess ... eventually it can be reduced:

$ git log -1 --shortstat --oneline eadcee65
eadcee65 macos: yet another tbd adjustment
8 files changed, 155 insertions(+), 169 deletions(-)

14 lines less, same functionality (although Christian claims that
it's broken since, who knows... ;)

Unfortunately tcc_warning() does not take arguments itself ...

I would (maybe) go for
    tcc_warning(On_warn_badthing "bad thing did happen with %s", stuff);
with say
    #define On_warn_badthing "\005"

While not sooo nice without a comma, it would allow to "manage away"
quite a few existing 'if (s1->warn_...)' clauses already and seems
somewhat easily extensible.

With some luck one might be able to implement the feature (-Werror= etc.)
and come out with +/- zero or even less additional lines required.

Currently it still adds 78 lines total though:
$ git diff --shortstat a7a138~1 2709b7
8 files changed, 126 insertions(+), 48 deletions(-)

--- grischka

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