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Add libc ABI extension kludge for baseline-violating libdl symbols

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Some targets have a GLIBC_2.0 baseline for libdl, while using
GLIBC_2.2 for libc.  This means that the generated libc.map file
does not have any version nodes for GLIBC_2.0 or GLIBC_2.1.  However,
moving symbols from libdl into libc needs such version nodes.
(Future symbol moves from librt will need this as well.)

This kludge is only necessary for symbols predating GLIBC_2.2 because
the affected targets use GLIBC_2.2 as the baseline for libc.  Given
the small number and fixed set of affected architectures, no generic
mechanism is implemented, and instead the map file fragment is
hard-coded in scripts/versions.mk.

The compat_symbol macro already emits the appropriate version strings,
so no adjustments are needed there.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Florian Weimer 2021-06-02 07:32:19 +02:00
parent d32ee64df7
commit c44838ebf8
5 changed files with 29 additions and 1 deletions
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26
scripts/versions.awk
View File

@ -93,6 +93,26 @@ function ord(c) {
printf("%s %s %s\n", actlib, sortver, $0) | sort;
}
# Some targets do not set the ABI baseline for libdl. As a result,
# symbols originally in libdl need to be moved under historic symbol
# versions, without altering the baseline version for libc itself.
/^ *!libc_pre_versions/ {
libc_pre_versions_active = 1;
}
function libc_pre_versions() {
# No local: * here, so that we do not have to update this script
# if symbols are moved into libc. The abilist files and the other
# targets (with a real GLIBC_2.0 baseline) provide testing
# coverage.
printf("\
GLIBC_2.0 {\n\
};\n\
GLIBC_2.1 {\n\
} GLIBC_2.0;\n\
") > outfile;
return "GLIBC_2.1";
}
function closeversion(name, oldname) {
printf(" local:\n *;\n") > outfile;
@ -154,7 +174,11 @@ END {
oldlib = $1;
real_outfile = buildroot oldlib ".map";
outfile = real_outfile "T";
veryoldver = "";
if ($1 == "libc" && libc_pre_versions_active) {
veryoldver = libc_pre_versions();
} else {
veryoldver = "";
}
printf(" %s.map", oldlib);
}
if ($2 != oldver) {

1
sysdeps/unix/sysv/linux/hppa/Versions
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@ -1,3 +1,4 @@
!libc_pre_versions
libc {
GLIBC_2.1 {
_sys_errlist; sys_errlist; _sys_nerr; sys_nerr;

1
sysdeps/unix/sysv/linux/ia64/Versions
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@ -1,3 +1,4 @@
!libc_pre_versions
libc {
GLIBC_2.2 {
ioperm; iopl;

1
sysdeps/unix/sysv/linux/sh/Versions
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@ -1,3 +1,4 @@
!libc_pre_versions
libc {
GLIBC_2.2 {
# functions used in other libraries

1
sysdeps/unix/sysv/linux/sparc/sparc64/Versions
View File

@ -1,3 +1,4 @@
!libc_pre_versions
libc {
GLIBC_2.0 {
# Exception handling support functions from libgcc