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bpo-46600: ./configure --with-pydebug uses -Og with clang #31052

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merged 2 commits into from Feb 1, 2022
+71 −14
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bpo-46600: ./configure --with-pydebug uses -Og with clang #31052

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05e2a91
bpo-46600: ./configure --with-pydebug uses -Og with clang
vstinner Feb 1, 2022
e11c116
Use _SAVE_VAR/_RESTORE_VAR
vstinner Feb 1, 2022
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3 Misc/NEWS.d/next/Build/2022-02-01-14-07-37.bpo-46600.NNLnfj.rst
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@@ -0,0 +1,3 @@
Fix the test checking if the C compiler supports ``-Og`` option in the
``./configure`` script to also use ``-Og`` on clang which supports it. Patch
by Victor Stinner.
52 configure
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30 configure.ac
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@@ -1791,6 +1791,28 @@ case $CC in
fi
esac

# Check if CC supports -Og optimization level
_SAVE_VAR([CFLAGS])
CFLAGS="-Og"
AC_CACHE_CHECK([if $CC supports -Og optimization level],
[ac_cv_cc_supports_og],
AC_COMPILE_IFELSE(
[
AC_LANG_PROGRAM([[]], [[]])
],[
ac_cv_cc_supports_og=yes
],[
ac_cv_cc_supports_og=no
])
)
_RESTORE_VAR([CFLAGS])

# Optimization messes up debuggers, so turn it off for
# debug builds.
PYDEBUG_CFLAGS="-O0"
AS_VAR_IF([ac_cv_cc_supports_og], [yes],
[PYDEBUG_CFLAGS="-Og"])

# tweak OPT based on compiler and platform, only if the user didn't set
# it on the command line
AC_SUBST(OPT)
@@ -1816,13 +1838,7 @@ then
case $ac_cv_prog_cc_g in
yes)
if test "$Py_DEBUG" = 'true' ; then
# Optimization messes up debuggers, so turn it off for
# debug builds.
if "$CC" -v --help 2>/dev/null |grep -- -Og > /dev/null; then
OPT="-g -Og -Wall"
else
OPT="-g -O0 -Wall"
fi
OPT="-g $PYDEBUG_CFLAGS -Wall"
else
OPT="-g $WRAP -O3 -Wall"
fi
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