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config.guess: combine two heuristics to detect musl libc

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Apparently, this is needed to correctly detect musl libc in different
versions of Alpine Linux.

According to
https://lists.gnu.org/archive/html/config-patches/2020-09/msg00002.html,
the ldd based check does not work for some old versions of the Alpine Linux,
and, according to
https://lists.gnu.org/archive/html/config-patches/2020-11/msg00002.html,
the compiler may not be available in a fresh Alpine container.

The ldd based check is essentially the same as the check that was
introduced by commit 3d00f60242, it is
performed iff the compiler based check could not give a definitive
answer.

Reported-by: Cheng XU <xucheng@me.com>
Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
This commit is contained in:
Dmitry V. Levin
2020-11-05 08:00:00 +00:00
parent 77632d92f2
commit edcc7bbb5d
3 changed files with 23 additions and 7 deletions
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4
ChangeLog
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@ -1,3 +1,7 @@
2020-11-17 Dmitry V. Levin <ldv@altlinux.org>
* config.guess: Combine two heuristics to detect musl libc.
2020-11-07 Ben Elliston <bje@gnu.org>
* config.sub, config.guess: Replace backtick `..` substitutions

24
config.guess vendored
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@ -2,7 +2,7 @@
# Attempt to guess a canonical system name.
# Copyright 1992-2020 Free Software Foundation, Inc.
timestamp='2020-11-07'
timestamp='2020-11-17'
# This file is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
@ -138,9 +138,7 @@ UNAME_VERSION=$( (uname -v) 2>/dev/null) || UNAME_VERSION=unknown
case "$UNAME_SYSTEM" in
Linux|GNU|GNU/*)
# If the system lacks a compiler, then just pick glibc.
# We could probably try harder.
LIBC=gnu
LIBC=unknown
set_cc_for_build
cat <<-EOF > "$dummy.c"
@ -149,16 +147,30 @@ Linux|GNU|GNU/*)
LIBC=uclibc
#elif defined(__dietlibc__)
LIBC=dietlibc
#elif defined(__GLIBC__)
LIBC=gnu
#else
#include <stdarg.h>
/* First heuristic to detect musl libc. */
#ifdef __DEFINED_va_list
LIBC=musl
#else
LIBC=gnu
#endif
#endif
EOF
eval "$($CC_FOR_BUILD -E "$dummy.c" 2>/dev/null | grep '^LIBC' | sed 's, ,,g')"
# Second heuristic to detect musl libc.
if [ "$LIBC" = unknown ] &&
command -v ldd >/dev/null &&
ldd --version 2>&1 | grep -q ^musl; then
LIBC=musl
fi
# If the system lacks a compiler, then just pick glibc.
# We could probably try harder.
if [ "$LIBC" = unknown ]; then
LIBC=gnu
fi
;;
esac

2
config.sub vendored
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@ -2,7 +2,7 @@
# Configuration validation subroutine script.
# Copyright 1992-2020 Free Software Foundation, Inc.
timestamp='2020-11-07'
timestamp='2020-11-17'
# This file is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by