8000 gh-112301: Add -Wformat=2 compiler option to NODIST by nohlson · Pull Request #122474 · python/cpython · GitHub
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gh-112301: Add -Wformat=2 compiler option to NODIST #122474

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gh-112301: Add -Wformat=2 compiler option to NODIST #122474

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c5396a1
Add -Wformat=2 compiler option to NODIST default
nohlson Jul 30, 2024
19437ef
Add -Wformat to NODIST
nohlson Jul 30, 2024
cba84fe
📜🤖 Added by blurb_it.
blurb-it[bot] Jul 30, 2024
178bcc6
Add fail on warning regression option to ubuntu builds
nohlson Jul 30, 2024
3bc76ca
Add warning ignores to code with nonliteral format strings
nohlson Aug 5, 2024
c4b8cf9
Limit pragmas to gcc/clang
nohlson Aug 5, 2024
8cff32e
Refactor version _Py_InitVersion to use format string literals
nohlson Aug 7, 2024
95c612c
Merge branch 'main' into add-format-level-2
nohlson Sep 18, 2024
a3b0c46
Create pyport preprocessor macro for ignoring format nonliterals
nohlson Sep 18, 2024
fa52862
Add MSVC boilerplate macro for ignoring format nonliteral
nohlson Sep 18, 2024
6cd1def
Add nonliteral macro
nohlson Sep 18, 2024
13e9c80
Merge branch 'main' into add-format-level-2
nohlson Sep 24, 2024
b62d155
Merge branch 'main' into add-format-level-2
nohlson Sep 30, 2024
9806f88
Merge main
nohlson Sep 30, 2024
88fbc65
Pull unicodeobject changes
nohlson Sep 30, 2024
b6db214
Merge branch 'main' into add-format-level-2
nohlson Oct 8, 2024
304aed1
Update macos warningignore for new warnings
nohlson Oct 8, 2024
5afb8d8
Fix mimalloc directory warning ignore
nohlson Oct 8, 2024
1e664f6
Revert pyport
nohlson Oct 8, 2024
1b4089b
Formatting nit
erlend-aasland Oct 14, 2024
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Limit pragmas to gcc/clang
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@nohlson
nohlson committed Aug 5, 2024
commit c4b8cf9d602429456a390b71a8cc2ae799a84953
4 changes: 4 additions & 0 deletions Objects/unicodeobject.c
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Expand Up @@ -2855,8 +2855,10 @@ unicode_fromformat_arg(_PyUnicodeWriter *writer,
// constant strings, and the variable used to index into the arrays
// is only assigned known constant values. Ignore warnings related
// to the format string not being a string literal.
#if defined(__GNUC__) || defined(__clang__)
#pragma GCC diagnostic push
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Consider using _Py_COMP_DIAG_PUSH/_Py_COMP_DIAG_POP, and adding a macro like _Py_COMP_DIAG_IGNORE_DEPR_DECLS, to make this easier to port to other compilers.

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@encukou created macro for ignoring format nonliterals and applied it to this block

#pragma GCC diagnostic ignored "-Wformat-nonliteral"
#endif
switch (sizemod) {
case F_LONG:
len = issigned ?
Expand Down Expand Up @@ -2887,7 +2889,9 @@ unicode_fromformat_arg(_PyUnicodeWriter *writer,
sprintf(buffer, fmt, va_arg(*vargs, unsigned int));
break;
}
#if defined(__GNUC__) || defined(__clang__)
#pragma GCC diagnostic pop
#endif
assert(len >= 0);

int sign = (buffer[0] == '-');
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4 changes: 4 additions & 0 deletions Python/getversion.c
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Expand Up @@ -21,11 +21,15 @@ void _Py_InitVersion(void)
#endif
// The format string is defined above and is observably safe.
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Could it be switched to a #defined literal? That way it could look safe to the compiler, too.

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I just pushed a change. I figure instead of going through the trouble defining a format string in the preprocessor #if/#else blocks and adding all of the diagnostic pragmas we can just put the PyOS_snprintf() with the relevant format string literals in the respective #if/#else blocks. We eliminate the root cause of the warning instead of ignore it.

// Ignore warnings related to non-literal format strings.
#if defined(__GNUC__) && !defined(__clang__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wformat-nonliteral"
#endif
PyOS_snprintf(version, sizeof(version), buildinfo_format,
PY_VERSION, Py_GetBuildInfo(), Py_GetCompiler());
#if defined(__GNUC__) && !defined(__clang__)
#pragma GCC diagnostic pop
#endif
}

const char *
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