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Suppress "has no symbols" linker warnings on macOS.

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After a recent macOS update, building Postgres produces warnings
that look like this:

    ranlib: warning: 'libpgport_shlib.a(pg_cpu_x86.c.o)' has no symbols
    ranlib: warning: 'libpgport_shlib.a(pg_popcount_x86.c.o)' has no symbols

To fix, add a dummy symbol to files that may otherwise have none.
Per project policy, this is a candidate for back-patching into
out-of-support branches: it suppresses annoying compiler warnings
but changes no behavior.

Reported-by: Zhang Mingli <zmlpostgres@gmail.com>
Reviewed-by: John Naylor <johncnaylorls@gmail.com>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/229aaaf3-f529-44ed-8e50-00cb6909af21%40Spark
Backpatch-through: 13
This commit is contained in:
Nathan Bossart 2026-04-29 12:25:09 -05:00
parent a424e31b16
commit 3dd42ee97b
3 changed files with 20 additions and 3 deletions
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7
src/port/pg_cpu_x86.c
View file

@ -263,5 +263,10 @@ x86_hypervisor_tsc_frequency_khz(void)
return 0;
}
#else /* defined(USE_SSE2) || defined(__i386__) */
#endif /* defined(USE_SSE2) || defined(__i386__) */
/* prevent linker complaints about empty module */
extern int pg_cpu_x86_dummy_variable;
int pg_cpu_x86_dummy_variable = 0;
#endif /* ! (USE_SSE2 || __i386__) */

8
src/port/pg_popcount_aarch64.c
View file

@ -463,4 +463,10 @@ pg_popcount_masked_neon(const char *buf, int bytes, uint8 mask)
return popcnt;
}
#endif /* USE_NEON */
#else /* USE_NEON */
/* prevent linker complaints about empty module */
extern int pg_popcount_aarch64_dummy_variable;
int pg_popcount_aarch64_dummy_variable = 0;
#endif /* ! USE_NEON */

8
src/port/pg_popcount_x86.c
View file

@ -301,4 +301,10 @@ pg_popcount_masked_sse42(const char *buf, int bytes, uint8 mask)
return popcnt;
}
#endif /* HAVE_X86_64_POPCNTQ */
#else /* HAVE_X86_64_POPCNTQ */
/* prevent linker complaints about empty module */
extern int pg_popcount_x86_dummy_variable;
int pg_popcount_x86_dummy_variable = 0;
#endif /* ! HAVE_X86_64_POPCNTQ */