From: "H.J. Lu" <hjl.tools@gmail.com>
To: GNU C Library <libc-alpha@sourceware.org>, binutils@sourceware.org
Subject: RFC: Add GNU_PROPERTY_1_GLIBC_2_NEEDED
Date: Tue, 26 Oct 2021 07:53:09 -0700 [thread overview]
Message-ID: <YXgWVU2+EsA31TdJ@gmail.com> (raw)
/* The needed glibc 2 minor version property for the object file. */
#define GNU_PROPERTY_1_GLIBC_2_NEEDED (GNU_PROPERTY_UINT32_OR_LO + 1)
/* The needed glibc 2 minor base version. */
#define GNU_PROPERTY_1_GLIBC_2_NEEDED_MINOR_BASE 35
/* Set if the object file requires glibc 2 minor version M. */
#define GNU_PROPERTY_1_GLIBC_2_NEEDED_MINOR_VERSION(m) \
(1U << ((m) - GNU_PROPERTY_1_GLIBC_2_NEEDED_MINOR_BASE))
Linker adds glibc versions in GNU_PROPERTY_1_GLIBC_2_NEEDED to DT_VERNEED.
It can be used to embed glibc version dependency in .o files:
[hjl@gnu-cfl-2 elfvers-1]$ ./readelf -n x.o
Displaying notes found in: .note.gnu.property
Owner Data size Description
GNU 0x00000020 NT_GNU_PROPERTY_TYPE_0
Properties: x86 ISA used:
x86 feature used: x86
[hjl@gnu-cfl-2 elfvers-1]$ ./readelf -n glibc-2-minor-1.o
Displaying notes found in: .note.gnu.property
Owner Data size Description
GNU 0x00000010 NT_GNU_PROPERTY_TYPE_0
Properties: 1_glibc_2_needed: 2.35, 2.38
GNU 0x00000020 NT_GNU_PROPERTY_TYPE_0
Properties: x86 ISA used:
x86 feature used: x86
[hjl@gnu-cfl-2 elfvers-1]$ make x
gcc -B./ -o x x.o glibc-2-minor-1.o
[hjl@gnu-cfl-2 elfvers-1]$ ./readelf -n --version-info x
Version symbols section '.gnu.version' contains 4 entries:
Addr: 0x00000000004004ae Offset: 0x0004ae Link: 6 (.dynsym)
000: 0 (*local*) 2 (GLIBC_2.34) 3 (GLIBC_2.2.5) 1 (*global*)
Version needs section '.gnu.version_r' contains 1 entry:
Addr: 0x00000000004004b8 Offset: 0x0004b8 Link: 7 (.dynstr)
000000: Version: 1 File: libc.so.6 Cnt: 4
0x0010: Name: GLIBC_2.38 Flags: none Version: 5
0x0020: Name: GLIBC_2.35 Flags: none Version: 4
0x0030: Name: GLIBC_2.2.5 Flags: none Version: 3
0x0040: Name: GLIBC_2.34 Flags: none Version: 2
Displaying notes found in: .note.gnu.property
Owner Data size Description
GNU 0x00000040 NT_GNU_PROPERTY_TYPE_0
Properties: 1_glibc_2_needed: 2.35, 2.38
...
[hjl@gnu-cfl-2 elfvers-1]$ ./x
./x: /lib64/libc.so.6: version `GLIBC_2.38' not found (required by ./x)
./x: /lib64/libc.so.6: version `GLIBC_2.35' not found (required by ./x)
[hjl@gnu-cfl-2 elfvers-1]$
H.J.
next reply other threads:[~2021-10-26 14:53 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-26 14:53 H.J. Lu [this message]
2021-10-26 15:25 ` Florian Weimer
2021-10-26 15:51 ` H.J. Lu
2021-10-26 18:39 ` v2: " H.J. Lu
2021-10-28 6:55 ` Florian Weimer
2021-10-28 13:37 ` H.J. Lu
2021-10-28 14:08 ` Florian Weimer
2021-10-28 14:17 ` H.J. Lu
2021-10-28 14:20 ` H.J. Lu
2021-10-29 18:11 ` Florian Weimer
2021-10-29 12:47 ` Michael Matz
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