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Fix pg_crc32c_armv8_choose.c to build with ancient glibc releases.

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If you go back as far as the RHEL7 era, <sys/auxv.h> does not provide
the HWCAPxxx macros needed with elf_aux_info or getauxval, so you need
to get those from the kernel header <asm/hwcap.h> instead.  We knew
that for the 32-bit case but failed to extrapolate to the 64-bit case.
Oversight in commit aac831caf.

Reported-by: GaoZengqi <pgf00a@gmail.com>
Author: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/CAFmBtr3Av62-jBzdhFkDHXJF9vQmNtSnH2upwODjnRcsgdTytw@mail.gmail.com
Backpatch-through: 18
This commit is contained in:
Tom Lane 2025-11-17 15:24:34 -05:00
parent ed931377ab
commit 6d969ca687
1 changed files with 2 additions and 1 deletions
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3
src/port/pg_crc32c_armv8_choose.c
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@ -26,7 +26,8 @@
#if defined(HAVE_ELF_AUX_INFO) || defined(HAVE_GETAUXVAL)
#include <sys/auxv.h>
#if defined(__linux__) && !defined(__aarch64__) && !defined(HWCAP2_CRC32)
/* Ancient glibc releases don't include the HWCAPxxx macros in sys/auxv.h */
#if defined(__linux__) && (defined(__aarch64__) ? !defined(HWCAP_CRC32) : !defined(HWCAP2_CRC32))
#include <asm/hwcap.h>
#endif
#endif