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#! /bin/sh
# This test is only run if we are building a shared library intended
# to be binary backward compatible with GNU libc (libcrypt.so.1).
# It locates any installed version of libcrypt.so.1, and verifies that
# each public symbol exposed by that library is also exposed by our
# libcrypt.so.1 with a matching symbol version.
#
# Due to limitations in Automake, this program takes parameters from
# the environment:
# $lib_la - full pathname of libcrypt.la
set -e
LC_ALL=C; export LC_ALL
get_symbols_with_versions ()
{
nm -gD --with-symbol-versions "$1" |
grep -v ' U ' | cut -d' ' -f3 |
sed -e 's/@@*/ /; /^\([A-Z0-9_.]*\) \1$/d' |
sort -u
}
get_our_symbols_with_versions ()
{
eval $(grep dlname= "$1")
get_symbols_with_versions "${1%/*}/.libs/${dlname}"
unset dlname
}
get_their_symbols_with_versions ()
{
(
set -e
cd "$1"
cat >test.c <<\EOF
extern char *crypt(const char *, const char *);
int main(int argc, char **argv)
{
return !!crypt(argv[0], argv[1]);
}
EOF
${CC-cc} test.c -lcrypt >&2 || exit 77
if ldd ./a.out | grep -qF libcrypt.so.1; then
get_symbols_with_versions $(ldd ./a.out | grep -F libcrypt.so.1 |
cut -d' ' -f3)
else
exit 77
fi
)
if [ $? -ne 0 ]; then exit $?; fi
}
if [ ! -f "$lib_la" ]; then
echo "Usage: lib_la=/path/to/library.la $0" >&2
exit 1
fi
# If 'nm' and/or 'ldd' are not available, this test will not work.
command -v nm > /dev/null 2>&1 || {
echo "Error: 'nm' is unavailable" >&2
exit 77
}
command -v ldd > /dev/null 2>&1 || {
echo "Error: 'ldd' is unavailable" >&2
exit 77
}
workdir=""
trap '[ -z "$workdir" ] || rm -rf "$workdir" || :' 0
workdir="$(mktemp -d)"
get_our_symbols_with_versions "$lib_la" > "$workdir/our_symbols"
get_their_symbols_with_versions "$workdir" > "$workdir/their_symbols"
# It's okay if we define more symbol (versions) than they do, but every
# symbol they define should have a matching definition in our library.
missing_symbols="$(comm -13 "$workdir/our_symbols" "$workdir/their_symbols")"
if [ -n "$missing_symbols" ]; then
printf '*** Missing symbols: %s\n' "$missing_symbols" >&2
exit 1
fi
exit 0
|
