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author | Florian Weimer <fweimer@redhat.com> | 2021-06-02 07:32:19 +0200 |
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committer | Florian Weimer <fweimer@redhat.com> | 2021-06-02 07:34:24 +0200 |
commit | c44838ebf8b8da0795d56e05b477c5d2b37b4a19 (patch) | |
tree | c1dc4f38603b4b09748ae2bf334022109279c234 /scripts/versions.awk | |
parent | d32ee64df750c2a1ebfffaccc1c02251a73d0532 (diff) | |
download | glibc-c44838ebf8b8da0795d56e05b477c5d2b37b4a19.zip glibc-c44838ebf8b8da0795d56e05b477c5d2b37b4a19.tar.gz glibc-c44838ebf8b8da0795d56e05b477c5d2b37b4a19.tar.bz2 |
Add libc ABI extension kludge for baseline-violating libdl symbols
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>
Diffstat (limited to 'scripts/versions.awk')
-rw-r--r-- | scripts/versions.awk | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/scripts/versions.awk b/scripts/versions.awk index a715448..565233e 100644 --- a/scripts/versions.awk +++ b/scripts/versions.awk @@ -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) { |