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autotools: stop setting -std=gnu89 with --enable-warnings

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Do not alter the C standard when building with `--enable-warnings` when
building with gcc.

On one hand this alters warning results compared to a default build.
On the other, it may produce different binaries, which is unexpected.

Also fix new warnings that appeared after removing `-std=gnu89`:

- include: fix public curl headers to use the correct printf mask for
  `CURL_FORMAT_CURL_OFF_T` and `CURL_FORMAT_CURL_OFF_TU` with mingw-w64
  and Visual Studio 2013 and newer. This fixes the printf mask warnings
  in examples and tests. E.g. [1]

- conncache: fix printf format string [2].

- http2: fix potential null pointer dereference [3].
  (seen on Slackware with gcc 11.)

- libssh: fix printf format string in SFTP code [4].
  Also make MSVC builds compatible with old CRT versions.

- libssh2: fix printf format string in SFTP code for MSVC.
  Applying the same fix as for libssh above.

- unit1395: fix `argument is null` and related issues [5]:
  - stop calling `strcmp()` with NULL to avoid undefined behaviour.
  - fix checking results if some of them were NULL.
  - do not pass NULL to printf `%s`.

- ci: keep a build job with `-std=gnu89` to continue testing for
  C89-compliance. We can apply this to other gcc jobs as needed.
  Ref: b23ce2cee7 (2022-09-23) #9542

[1] https://dev.azure.com/daniel0244/curl/_build/results?buildId=18581&view=logs&jobId=ccf9cc6d-2ef1-5cf2-2c09-30f0c14f923b
[2] https://github.com/curl/curl/actions/runs/6896854263/job/18763831142?pr=12346#step:6:67
[3] https://github.com/curl/curl/actions/runs/6896854253/job/18763839238?pr=12346#step:30:214
[4] https://github.com/curl/curl/actions/runs/6896854253/job/18763838007?pr=12346#step:29:895
[5] https://github.com/curl/curl/actions/runs/6896854253/job/18763836775?pr=12346#step:33:1689

Closes #12346
This commit is contained in:
Viktor Szakats 2023-11-16 21:44:45 +00:00
parent 95231921b2
commit 413a0fedd0
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8 changed files with 59 additions and 27 deletions
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.github/workflows/linux.yml vendored
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@ -105,7 +105,7 @@ jobs:
- name: openssl3
install_packages: zlib1g-dev valgrind
install_steps: gcc-11 openssl3 pytest
configure: LDFLAGS="-Wl,-rpath,$HOME/openssl3/lib64" --with-openssl=$HOME/openssl3 --enable-debug --enable-websockets
configure: CFLAGS=-std=gnu89 LDFLAGS="-Wl,-rpath,$HOME/openssl3/lib64" --with-openssl=$HOME/openssl3 --enable-debug --enable-websockets
singleuse: --unit
- name: openssl3-O3