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doc: update re 32-bit builds

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* README-install: Mention how to build on 32-bit-only hosts.
This builds on a previous patch by Pádraig Brady.
This commit is contained in:
Paul Eggert 2023-04-10 11:55:54 -07:00
parent ae4dace2ec
commit cc95246ee2
1 changed files with 7 additions and 7 deletions
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README-install
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@ -54,13 +54,13 @@ all mention of "[$(EXEEXT)" from src/Makefile.
32 bit time_t build failures
------------------------
On systems where it's determined that 64 bit time_t is supported
(indicated by touch -t <some time after 2038>), but that coreutils
would be built with a narrower time_t, the build will fail.
This can be allowed by passing TIME_T_32_BIT_OK=yes to configure,
or avoided by enabling 64 bit builds. For example GCC on AIX defaults
to 32 bit, and to enable the 64 bit ABI one can use:
./configure CFLAGS=-maix64 LDFLAGs=-maix64 AR='ar -X64'
Although 32-bit builds fail if that forces time_t to be 32 bits, this
can be fixed by using 64-bit builds. For example, on AIX where GCC
defaults to 32 bits, one can use "./configure CC='gcc -maix64' AR='ar
-X64'"; similarly, on Solaris one can configure with CC='gcc -m64'.
If all else fails one can configure with ac_year2038_required=no;
however, this will mishandle timestamps after 2038, and please file
bug reports for any such situations.
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