97 lines
2.7 KiB
Diff
97 lines
2.7 KiB
Diff
From dd9da7bc9306b95496d502589f95be0efc097fc0 Mon Sep 17 00:00:00 2001
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From: Alexander Bokovoy <ab@samba.org>
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Date: Thu, 12 Jul 2018 10:19:41 +0300
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Subject: [PATCH] wafsamba/samba_abi: always hide ABI symbols which must be
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local
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binutils 2.31 is going to change how shared libraries are linked, such
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that they always provide their own local definitions of the _end, _edata
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and _bss_start symbols. This would all be fine, except for shared
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libraries that export all symbols be default. (Rather than just
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exporting those symbols that form part of their API).
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According to binutils developers, we should only export the symbols we
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explicitly want to be used. We don't use this principle for all our
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libraries and deliberately don't want to have ABI versioning control for
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all of them, so the change I introduce here is to explicitly mark those
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symbols that will always be added by default linker configuration with
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binutils 2.31 as local. Right now these are '_end', '_edata', and
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'__bss_start' symbols.
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Signed-off-by: Alexander Bokovoy <ab@samba.org>
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---
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buildtools/wafsamba/samba_abi.py | 10 ++++++----
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buildtools/wafsamba/tests/test_abi.py | 14 ++++++++++++++
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2 files changed, 20 insertions(+), 4 deletions(-)
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diff --git a/buildtools/wafsamba/samba_abi.py b/buildtools/wafsamba/samba_abi.py
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index 196b468f5b3..4603e764fea 100644
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--- a/buildtools/wafsamba/samba_abi.py
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+++ b/buildtools/wafsamba/samba_abi.py
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@@ -192,10 +192,12 @@ def abi_write_vscript(f, libname, current_version, versions, symmap, abi_match):
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f.write("\t\t%s;\n" % x)
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else:
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f.write("\t\t*;\n")
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- if abi_match != ["*"]:
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- f.write("\tlocal:\n")
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- for x in local_abi:
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- f.write("\t\t%s;\n" % x[1:])
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+ # Always hide symbols that must be local if exist
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+ local_abi.extend(["!_end", "!__bss_start", "!_edata"])
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+ f.write("\tlocal:\n")
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+ for x in local_abi:
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+ f.write("\t\t%s;\n" % x[1:])
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+ if global_abi != ["*"]:
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if len(global_abi) > 0:
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f.write("\t\t*;\n")
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f.write("};\n")
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diff --git a/buildtools/wafsamba/tests/test_abi.py b/buildtools/wafsamba/tests/test_abi.py
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index bba78c1ba07..74892146990 100644
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--- a/buildtools/wafsamba/tests/test_abi.py
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+++ b/buildtools/wafsamba/tests/test_abi.py
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@@ -66,6 +66,10 @@ class WriteVscriptTests(TestCase):
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1.0 {
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\tglobal:
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\t\t*;
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+\tlocal:
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+\t\t_end;
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+\t\t__bss_start;
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+\t\t_edata;
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};
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""")
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@@ -84,6 +88,10 @@ MYLIB_0.1 {
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1.0 {
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\tglobal:
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\t\t*;
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+\tlocal:
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+\t\t_end;
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+\t\t__bss_start;
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+\t\t_edata;
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};
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""")
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@@ -99,6 +107,9 @@ MYLIB_0.1 {
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\t\t*;
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\tlocal:
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\t\texc_*;
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+\t\t_end;
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+\t\t__bss_start;
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+\t\t_edata;
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};
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""")
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@@ -115,6 +126,9 @@ MYLIB_0.1 {
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\t\tpub_*;
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\tlocal:
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\t\texc_*;
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+\t\t_end;
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+\t\t__bss_start;
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+\t\t_edata;
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\t\t*;
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};
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""")
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--
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2.17.1
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