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gh-93491: Add support tier detection to configure (GH-93492)

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Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>
Co-authored-by: Steve Dower <steve.dower@microsoft.com>
Co-authored-by: Erlend Egeberg Aasland <erlend.aasland@protonmail.com>
This commit is contained in:
Christian Heimes 2022-06-10 15:25:33 +02:00 • committed by GitHub
parent a87c9b538f
commit 3124d9a5aa
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5 changed files with 196 additions and 1 deletions
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71
configure.ac
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@ -770,6 +770,35 @@ AC_PROG_GREP
AC_PROG_SED
AC_PROG_EGREP
dnl detect compiler name
dnl check for xlc before clang, newer xlc's can use clang as frontend.
dnl check for GCC last, other compilers set __GNUC__, too.
dnl msvc is listed for completeness.
AC_CACHE_CHECK([for CC compiler name], [ac_cv_cc_name], [
cat > conftest.c <<EOF
#if defined(__INTEL_COMPILER) || defined(__ICC)
icc
#elif defined(__ibmxl__) || defined(__xlc__) || defined(__xlC__)
xlc
#elif defined(_MSC_VER)
msvc
#elif defined(__clang__)
clang
#elif defined(__GNUC__)
gcc
#else
# error unknown compiler
#endif
EOF
if $CPP $CPPFLAGS conftest.c >conftest.out 2>/dev/null; then
ac_cv_cc_name=`grep -v '^#' conftest.out | grep -v '^ *$' | tr -d ' '`
else
ac_cv_cc_name="unknown"
fi
rm -f conftest.c conftest.out
])
# checks for UNIX variants that set C preprocessor variables
# may set _GNU_SOURCE, __EXTENSIONS__, _POSIX_PTHREAD_SEMANTICS,
# _POSIX_SOURCE, _POSIX_1_SOURCE, and more
@ -1031,6 +1060,42 @@ if test x$MULTIARCH != x; then
fi
AC_SUBST(MULTIARCH_CPPFLAGS)
dnl Support tiers according to https://peps.python.org/pep-0011/
dnl
dnl NOTE: Windows support tiers are defined in PC/pyconfig.h.
dnl
AC_MSG_CHECKING([for PEP 11 support tier])
AS_CASE([$host/$ac_cv_cc_name],
[x86_64-*-linux-gnu/gcc], [PY_SUPPORT_TIER=1], dnl Linux on AMD64, any vendor, glibc, gcc
[x86_64-apple-darwin*/clang], [PY_SUPPORT_TIER=1], dnl macOS on Intel, any version
[i686-pc-windows-msvc/msvc], [PY_SUPPORT_TIER=1], dnl 32bit Windows on Intel, MSVC
[x86_64-pc-windows-msvc/msvc], [PY_SUPPORT_TIER=1], dnl 64bit Windows on AMD64, MSVC
[aarch64-apple-darwin*/clang], [PY_SUPPORT_TIER=2], dnl macOS on M1, any version
[aarch64-*-linux-gnu/gcc], [PY_SUPPORT_TIER=2], dnl Linux ARM64, glibc, gcc+clang
[aarch64-*-linux-gnu/clang], [PY_SUPPORT_TIER=2],
[powerpc64le-*-linux-gnu/gcc], [PY_SUPPORT_TIER=2], dnl Linux on PPC64 little endian, glibc, gcc
[x86_64-*-linux-gnu/clang], [PY_SUPPORT_TIER=2], dnl Linux on AMD64, any vendor, glibc, clang
[aarch64-pc-windows-msvc/msvc], [PY_SUPPORT_TIER=3], dnl Windows ARM64, MSVC
[armv7l-*-linux-gnueabihf/gcc], [PY_SUPPORT_TIER=3], dnl ARMv7 LE with hardware floats, any vendor, glibc, gcc
[powerpc64le-*-linux-gnu/clang], [PY_SUPPORT_TIER=3], dnl Linux on PPC64 little endian, glibc, clang
[s390x-*-linux-gnu/gcc], [PY_SUPPORT_TIER=3], dnl Linux on 64bit s390x (big endian), glibc, gcc
dnl [wasm32-unknown-emscripten/clang], [PY_SUPPORT_TIER=3], dnl WebAssembly Emscripten
dnl [wasm32-unknown-wasi/clang], [PY_SUPPORT_TIER=3], dnl WebAssembly System Interface
[x86_64-*-freebsd/clang], [PY_SUPPORT_TIER=3], dnl FreeBSD on AMD64
[PY_SUPPORT_TIER=0]
)
AS_CASE([$PY_SUPPORT_TIER],
[1], [AC_MSG_RESULT([$host/$ac_cv_cc_name has tier 1 (supported)])],
[2], [AC_MSG_RESULT([$host/$ac_cv_cc_name has tier 2 (supported)])],
[3], [AC_MSG_RESULT([$host/$ac_cv_cc_name has tier 3 (partially supported)])],
[AC_MSG_WARN([$host/$ac_cv_cc_name is not supported])]
)
AC_DEFINE_UNQUOTED([PY_SUPPORT_TIER], [$PY_SUPPORT_TIER], [PEP 11 Support tier (1, 2, 3 or 0 for unsupported)])
AC_CACHE_CHECK([for -Wl,--no-as-needed], [ac_cv_wl_no_as_needed], [
save_LDFLAGS="$LDFLAGS"
AS_VAR_APPEND([LDFLAGS], [-Wl,--no-as-needed])
@ -6878,3 +6943,9 @@ If you want a release build with all stable optimizations active (PGO, etc),
please run ./configure --enable-optimizations
])
fi
AS_VAR_IF([PY_SUPPORT_TIER], [0], [AC_MSG_WARN([
Platform "$host" with compiler "$ac_cv_cc_name" is not supported by the
CPython core team, see https://peps.python.org/pep-0011/ for more information.
])])