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gh-96821: Check for `-fstrict-overflow` only if `--with-strict-overflow` is passed by StanFromIreland · Pull Request #139595 · python/cpython · GitHub

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gh-96821: Check for -fstrict-overflow only if --with-strict-overflow is passed #139595

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gh-96821: Check for -fstrict-overflow only if --with-strict-overflow is passed #139595

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StanFromIreland Oct 5, 2025
a4180ed
make regen-configure again
StanFromIreland Oct 5, 2025
c5db991
Use `AX_CHECK_COMPILE_FLAG`
StanFromIreland Mar 9, 2026
efc2137
Merge branch 'main' into refactor-autoconf
StanFromIreland Mar 9, 2026
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103 changes: 76 additions & 27 deletions configure
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47 changes: 21 additions & 26 deletions configure.ac
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Original file line number Diff line number Diff line change
Expand Up @@ -2235,28 +2235,6 @@ AC_MSG_RESULT([$BOLT_APPLY_FLAGS])
# compiler and platform. BASECFLAGS tweaks need to be made even if the
# user set OPT.

dnl Historically, some of our code assumed that signed integer overflow
dnl is defined behaviour via twos-complement.
dnl Set STRICT_OVERFLOW_CFLAGS and NO_STRICT_OVERFLOW_CFLAGS depending on compiler support.
dnl Pass the latter to modules that depend on such behaviour.
_SAVE_VAR([CFLAGS])
CFLAGS="-fstrict-overflow -fno-strict-overflow"
AC_CACHE_CHECK([if $CC supports -fstrict-overflow and -fno-strict-overflow],
[ac_cv_cc_supports_fstrict_overflow],
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[]], [[]])],
[ac_cv_cc_supports_fstrict_overflow=yes],
[ac_cv_cc_supports_fstrict_overflow=no]
)
)
_RESTORE_VAR([CFLAGS])

AS_VAR_IF([ac_cv_cc_supports_fstrict_overflow], [yes],
[STRICT_OVERFLOW_CFLAGS="-fstrict-overflow"
NO_STRICT_OVERFLOW_CFLAGS="-fno-strict-overflow"],
[STRICT_OVERFLOW_CFLAGS=""
NO_STRICT_OVERFLOW_CFLAGS=""])

AC_MSG_CHECKING([for --with-strict-overflow])
AC_ARG_WITH([strict-overflow],
AS_HELP_STRING(
Expand All @@ -2265,12 +2243,29 @@ AC_ARG_WITH([strict-overflow],
),
[
AS_VAR_IF(
[ac_cv_cc_supports_fstrict_overflow], [no],
[AC_MSG_WARN([--with-strict-overflow=yes requires a compiler that supports -fstrict-overflow])],
[]
[with_strict_overflow], [yes],
[dnl Historically, some of our code assumed that signed integer overflow
dnl is defined behaviour via twos-complement.
dnl Set STRICT_OVERFLOW_CFLAGS and NO_STRICT_OVERFLOW_CFLAGS depending on compiler support.
dnl Pass the latter to modules that depend on such behaviour.
AX_CHECK_COMPILE_FLAG([-fstrict-overflow],
[AX_CHECK_COMPILE_FLAG([-fno-strict-overflow],
[STRICT_OVERFLOW_CFLAGS="-fstrict-overflow"
NO_STRICT_OVERFLOW_CFLAGS="-fno-strict-overflow"],
[AC_MSG_WARN([--with-strict-overflow=yes requires a compiler that supports -fno-strict-overflow])
STRICT_OVERFLOW_CFLAGS=""
NO_STRICT_OVERFLOW_CFLAGS=""])],
[AC_MSG_WARN([--with-strict-overflow=yes requires a compiler that supports -fstrict-overflow])
STRICT_OVERFLOW_CFLAGS=""
NO_STRICT_OVERFLOW_CFLAGS=""])
],
[STRICT_OVERFLOW_CFLAGS=""
NO_STRICT_OVERFLOW_CFLAGS="-fno-strict-overflow"]
)
],
[with_strict_overflow=no]
[with_strict_overflow=no
STRICT_OVERFLOW_CFLAGS=""
NO_STRICT_OVERFLOW_CFLAGS="-fno-strict-overflow"]
)
AC_MSG_RESULT([$with_strict_overflow])

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