Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Mark the *printf functions with __attribute__((format)). #80

Open
wants to merge 1 commit into
base: master
Choose a base branch
from
Open

Mark the *printf functions with __attribute__((format)). #80

wants to merge 1 commit into from

Conversation

svkampen
Copy link

See issue #79.

@svkampen
Mark the *printf functions with __attribute__((format)).
d8aeaa9 
Using __attribute__((format)) means that compilers supporting the
attribute (GCC, clang, icc, perhaps others) will automatically issue
warnings when printf arguments are incorrectly typed (i.e. inconsistent
with the type specified in the format string).
@codecov-commenter
Copy link

codecov-commenter commented Jul 3, 2020 •
edited

Codecov Report

Merging #80 into master will not change coverage.
The diff coverage is n/a.

Impacted file tree graph

@@            Coverage Diff            @@
##            master       #80   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines          359       359           
=========================================
  Hits           359       359

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d3b9846...d8aeaa9. Read the comment docs.

@svkampen svkampen changed the title Mark the variadic *printf functions with __attribute__((format)). Mark the *printf functions with __attribute__((format)). Jul 3, 2020
@eyalroz
Copy link

eyalroz commented Jun 29, 2021

When the format attribute is added, we get a massive amounts of warnings from test_suite.cpp, including:

warning: flag ' ' results in undefined behavior with 's' conversion specifier [-Wformat]
warning: format specifies type 'char' but the argument has type 'int' [-Wformat]
warning: invalid conversion specifier 'b' [-Wformat-invalid-specifier]
 warning: flag '#' results in undefined behavior with 'u' conversion specifier [-Wformat]

Some can just be fixed by explicit casting (and TBH it's a bit surprising that they work... are we saved by the ABI perhaps?) ; others cannot.

What are your thoughts?...

Naturally, this is not my repository, but I've been thinking of merging this into my fork, which already has, merged, the work of some others around here (e.g. warning fixes, glibc %p behavior etc.). I even created a PR for that, but while merging I noticed all those warnings.

@joshklod
Copy link

When the format attribute is added, we get a massive amounts of warnings from test_suite.cpp

I believe I fixed this in my fork. See joshklod:format-attr for my implementation of this feature.

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Reviewers
No reviews
Assignees
No one assigned
Labels
None yet
Projects
None yet
Milestone
No milestone
Development

Successfully merging this pull request may close these issues.

None yet
4 participants
@svkampen @codecov-commenter @eyalroz @joshklod