From: Alexey Sheplyakov <asheplyakov@basealt.ru>
To: devel@lists.altlinux.org
Subject: [devel] Статические библиотеки и thin LTO (Was: I: LTO in %optflags by default)
Date: Fri, 27 Aug 2021 23:43:17 +0400
Message-ID: <043cdbd3-8056-6468-2a3e-78304d89dcd0@basealt.ru> (raw)
In-Reply-To: <20210824182216.GC5179@altlinux.org>
Добрый вечер!
On 24.08.2021 22:22, Dmitry V. Levin wrote:
> On Tue, Aug 24, 2021 at 09:20:50PM +0300, Dmitry V. Levin wrote:
>> * 382 пакета перестанут пересобираться с диагностикой следующего вида:
>> process-lto: ERROR: ./usr/lib64/libtcb.a: contains __gnu_lto_slim only.
>> Perhaps, you need to %define optflags_lto %optflags_lto -ffat-lto-objects
Странно это. GCC прекрасно умеет создавать и использовать архивы
из thin LTO объектов:
cat > add.c <<-EOF
int add(int x, int y) { return x + y; }
EOF
cat > main.c <<-EOF
extern int add(int x, int y);
int main(int argc, char **argv) {
volatile int a = 1;
volatile int b = 2;
return add(a, b);
}
EOF
gcc -c -flto -fno-fat-lto-objects -O2 -g add.c
gcc-ar rcs libadd.a add.o
gcc -c -flto -fno-fat-lto-objects -O2 -g main.c
gcc -flto -O2 -o main main.o libadd.a
objdump -j .text --disassemble=main main
Получаю:
main: file format elf64-x86-64
Disassembly of section .text:
0000000000001040 <main>:
1040: f3 0f 1e fa endbr64
1044: c7 44 24 fc 01 00 00 movl $0x1,-0x4(%rsp)
104b: 00
104c: c7 44 24 f8 02 00 00 movl $0x2,-0x8(%rsp)
1053: 00
1054: 8b 44 24 f8 mov -0x8(%rsp),%eax
1058: 8b 54 24 fc mov -0x4(%rsp),%edx
105c: 01 d0 add %edx,%eax
105e: c3 ret
next prev parent reply other threads:[~2021-08-27 19:43 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-24 18:20 [devel] I: LTO in %optflags by default Dmitry V. Levin
2021-08-24 18:21 ` Dmitry V. Levin
2021-08-24 18:22 ` Dmitry V. Levin
2021-08-25 0:04 ` Dmitry V. Levin
2021-08-25 8:18 ` Vitaly Lipatov
2021-08-25 8:28 ` Ivan A. Melnikov
2021-08-25 8:38 ` Vitaly Lipatov
2021-08-25 9:18 ` Andrey Savchenko
2021-08-25 17:14 ` [devel] devel-static Dmitry V. Levin
2021-08-25 17:25 ` Alexey Sheplyakov
2021-08-25 19:19 ` Andrey Savchenko
2021-08-25 19:14 ` Andrey Savchenko
2021-08-25 19:58 ` Vitaly Lipatov
2021-08-25 20:52 ` Andrey Savchenko
2021-08-25 21:06 ` Vitaly Lipatov
2021-08-25 21:36 ` Andrey Savchenko
2021-08-27 19:43 ` Alexey Sheplyakov [this message]
2021-08-27 22:18 ` [devel] Статические библиотеки и thin LTO Vitaly Chikunov
2021-08-29 6:34 ` Alexey Sheplyakov
2021-08-30 9:18 ` Dmitry V. Levin
2021-08-30 9:30 ` Andrey Savchenko
2021-08-30 9:39 ` Dmitry V. Levin
2021-08-30 14:36 ` Andrey Savchenko
2021-08-30 9:50 ` Arseny Maslennikov
2021-08-24 18:23 ` [devel] I: LTO in %optflags by default Dmitry V. Levin
2021-08-24 19:19 ` Dmitry V. Levin
2021-08-25 0:33 ` Dmitry V. Levin
2021-08-26 6:00 ` [devel] I: LTO in %optflags by defaulta (top-level asm) Vitaly Chikunov
2021-08-25 5:27 ` [devel] I: LTO in %optflags by default Ivan A. Melnikov
2021-08-25 5:46 ` Denis Medvedev
2021-08-25 5:50 ` Denis Medvedev
2021-08-25 6:53 ` Andrey Savchenko
2021-08-25 7:03 ` Denis Medvedev
2021-08-25 7:32 ` Andrey Savchenko
2021-08-26 18:43 ` Michael Shigorin
2021-08-25 7:12 ` Ivan A. Melnikov
2021-08-25 8:14 ` Alexey Tourbin
2021-08-25 8:39 ` Andrey Savchenko
2021-08-25 7:12 ` Alexey Sheplyakov
2021-08-25 16:28 ` Dmitry V. Levin
2021-08-25 17:48 ` Dmitry V. Levin
2021-08-25 7:37 ` Alexey Sheplyakov
2021-08-25 18:07 ` [devel] Administrivia Dmitry V. Levin
2021-08-25 19:25 ` Alexey Sheplyakov
2021-08-25 20:03 ` Alexey V. Vissarionov
2021-08-26 19:02 ` [devel] Administrivii Michael Shigorin
2021-08-26 19:18 ` [devel] debugedit Dmitry V. Levin
2021-10-13 9:16 ` [devel] debugedit DWARF version 0 Denis Medvedev
2021-10-13 9:51 ` Dmitry V. Levin
2021-10-13 9:51 ` Denis Medvedev
2021-08-25 19:27 ` [devel] I: LTO in %optflags by default Andrey Savchenko
2021-08-25 23:54 ` Dmitry V. Levin
2021-08-26 9:35 ` Alexey V. Vissarionov
2021-08-26 19:33 ` Andrey Savchenko
2021-08-27 0:37 ` Dmitry V. Levin
2021-08-27 8:07 ` Sergey V Turchin
2021-08-27 9:11 ` Alexey V. Vissarionov
2021-08-27 10:00 ` Alexey Sheplyakov
2021-08-27 12:54 ` Dmitry V. Levin
2021-08-25 10:45 ` Vitaly Lipatov
2021-08-25 16:20 ` Dmitry V. Levin
2021-08-25 20:23 ` Vitaly Lipatov
2021-08-25 20:30 ` Dmitry V. Levin
2021-08-25 21:24 ` Dmitry V. Levin
2021-08-25 23:07 ` Aleksey Novodvorsky
2021-08-25 23:19 ` Dmitry V. Levin
2021-08-25 23:54 ` Andrey Savchenko
2021-08-26 0:04 ` Dmitry V. Levin
2021-08-26 6:39 ` Andrey Savchenko
2021-08-26 7:25 ` Vitaly Lipatov
2021-08-27 0:20 ` Dmitry V. Levin
2021-08-26 9:40 ` Alexey V. Vissarionov
2021-08-26 4:23 ` alexei
2021-08-26 8:24 ` Dmitry V. Levin
2021-08-26 0:26 ` Dmitry V. Levin
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