On Tue, Apr 28, 2026 at 09:09:09AM -0500, Nathan Bossart wrote: > On Tue, Apr 28, 2026 at 09:29:41AM -0400, Tom Lane wrote: >> If we do care, a low-tech solution could be to have a dummy symbol >> declared in each file, along the lines of >> >> #if HAVE_X86_64_POPCNTQ >> // code for popcntq case >> #elif HAVE_FROBNITZ >> // code for frobnitz case >> ... >> #else >> /* prevent linker complaints about empty module */ >> extern int pg_cpu_x86_dummy_variable; >> int pg_cpu_x86_dummy_variable = 0; >> #endif >> >> Actually then we'd not need to change the build systems either... > > I've been trying to avoid doing that, but it's a far simpler solution, and > in theory it should fix the problem for all platforms, too. So, it's > probably the way to go.
Here's a full set of patches for back-patching purposes. protocol_openssl.c has a similar problem on older versions. I suppose this is the sort of thing I could back-patch all the way to v9.2. Does anyone feel strongly one way or the other about that? -- nathan
>From 5dd13bb4fbbb0cf68ac7f8243d9eefabda540290 Mon Sep 17 00:00:00 2001 From: Nathan Bossart <[email protected]> Date: Tue, 28 Apr 2026 15:27:39 -0500 Subject: [PATCH v4 1/1] Suppress "has no symbols" linker warnings on macOS. 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. Reported-by: Zhang Mingli <[email protected]> Discussion: https://postgr.es/m/229aaaf3-f529-44ed-8e50-00cb6909af21%40Spark Backpatch-through: 14 --- src/common/protocol_openssl.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/src/common/protocol_openssl.c b/src/common/protocol_openssl.c index 92a0a22ecfb..7554e9444f6 100644 --- a/src/common/protocol_openssl.c +++ b/src/common/protocol_openssl.c @@ -114,4 +114,10 @@ SSL_CTX_set_max_proto_version(SSL_CTX *ctx, int version) return 1; /* success */ } -#endif /* !SSL_CTX_set_min_proto_version */ +#else + +/* prevent linker complaints about empty module */ +extern int protocol_openssl_dummy_variable; +int protocol_openssl_dummy_variable = 0; + +#endif -- 2.50.1 (Apple Git-155)
>From a563e891c72d47a9ed4aa840877214075963f4aa Mon Sep 17 00:00:00 2001 From: Nathan Bossart <[email protected]> Date: Tue, 28 Apr 2026 15:27:39 -0500 Subject: [PATCH v4 1/1] Suppress "has no symbols" linker warnings on macOS. 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. Reported-by: Zhang Mingli <[email protected]> Discussion: https://postgr.es/m/229aaaf3-f529-44ed-8e50-00cb6909af21%40Spark Backpatch-through: 14 --- src/common/protocol_openssl.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/src/common/protocol_openssl.c b/src/common/protocol_openssl.c index 8d1da8be387..6b116b5e30d 100644 --- a/src/common/protocol_openssl.c +++ b/src/common/protocol_openssl.c @@ -114,4 +114,10 @@ SSL_CTX_set_max_proto_version(SSL_CTX *ctx, int version) return 1; /* success */ } -#endif /* !SSL_CTX_set_min_proto_version */ +#else + +/* prevent linker complaints about empty module */ +extern int protocol_openssl_dummy_variable; +int protocol_openssl_dummy_variable = 0; + +#endif -- 2.50.1 (Apple Git-155)
>From 4ea3828ca4eb8ccc963a70e0b37124f37906974b Mon Sep 17 00:00:00 2001 From: Nathan Bossart <[email protected]> Date: Tue, 28 Apr 2026 15:27:39 -0500 Subject: [PATCH v4 1/1] Suppress "has no symbols" linker warnings on macOS. 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. Reported-by: Zhang Mingli <[email protected]> Discussion: https://postgr.es/m/229aaaf3-f529-44ed-8e50-00cb6909af21%40Spark Backpatch-through: 14 --- src/common/protocol_openssl.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/src/common/protocol_openssl.c b/src/common/protocol_openssl.c index 089cbd33cca..b82369dfd55 100644 --- a/src/common/protocol_openssl.c +++ b/src/common/protocol_openssl.c @@ -114,4 +114,10 @@ SSL_CTX_set_max_proto_version(SSL_CTX *ctx, int version) return 1; /* success */ } -#endif /* !SSL_CTX_set_min_proto_version */ +#else + +/* prevent linker complaints about empty module */ +extern int protocol_openssl_dummy_variable; +int protocol_openssl_dummy_variable = 0; + +#endif -- 2.50.1 (Apple Git-155)
>From db7ba3a37437aaf0e082a69013a7d3f062da5821 Mon Sep 17 00:00:00 2001 From: Nathan Bossart <[email protected]> Date: Tue, 28 Apr 2026 15:27:39 -0500 Subject: [PATCH v4 1/1] Suppress "has no symbols" linker warnings on macOS. 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. Reported-by: Zhang Mingli <[email protected]> Discussion: https://postgr.es/m/229aaaf3-f529-44ed-8e50-00cb6909af21%40Spark Backpatch-through: 14 --- src/common/protocol_openssl.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/src/common/protocol_openssl.c b/src/common/protocol_openssl.c index ae378685e1f..4c039775a3f 100644 --- a/src/common/protocol_openssl.c +++ b/src/common/protocol_openssl.c @@ -114,4 +114,10 @@ SSL_CTX_set_max_proto_version(SSL_CTX *ctx, int version) return 1; /* success */ } -#endif /* !SSL_CTX_set_min_proto_version */ +#else + +/* prevent linker complaints about empty module */ +extern int protocol_openssl_dummy_variable; +int protocol_openssl_dummy_variable = 0; + +#endif -- 2.50.1 (Apple Git-155)
>From edb7b2b83c2a8d4ad4bb068aea15a60a9253ec70 Mon Sep 17 00:00:00 2001 From: Nathan Bossart <[email protected]> Date: Tue, 28 Apr 2026 15:27:39 -0500 Subject: [PATCH v4 1/1] Suppress "has no symbols" linker warnings on macOS. 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. Reported-by: Zhang Mingli <[email protected]> Discussion: https://postgr.es/m/229aaaf3-f529-44ed-8e50-00cb6909af21%40Spark Backpatch-through: 14 --- src/port/pg_popcount_aarch64.c | 8 +++++++- src/port/pg_popcount_avx512.c | 9 ++++++++- 2 files changed, 15 insertions(+), 2 deletions(-) diff --git a/src/port/pg_popcount_aarch64.c b/src/port/pg_popcount_aarch64.c index 0b6b86de4d0..7a8c6d44e3c 100644 --- a/src/port/pg_popcount_aarch64.c +++ b/src/port/pg_popcount_aarch64.c @@ -478,4 +478,10 @@ pg_popcount_masked_neon(const char *buf, int bytes, bits8 mask) return popcnt; } -#endif /* POPCNT_AARCH64 */ +#else + +/* prevent linker complaints about empty module */ +extern int pg_popcount_aarch64_dummy_variable; +int pg_popcount_aarch64_dummy_variable = 0; + +#endif diff --git a/src/port/pg_popcount_avx512.c b/src/port/pg_popcount_avx512.c index 80c0aee3e73..d8998aa2083 100644 --- a/src/port/pg_popcount_avx512.c +++ b/src/port/pg_popcount_avx512.c @@ -220,4 +220,11 @@ pg_popcount_masked_avx512(const char *buf, int bytes, bits8 mask) } #endif /* TRY_POPCNT_X86_64 */ -#endif /* USE_AVX512_POPCNT_WITH_RUNTIME_CHECK */ + +#else + +/* prevent linker complaints about empty module */ +extern int pg_popcount_avx512_dummy_variable; +int pg_popcount_avx512_dummy_variable = 0; + +#endif -- 2.50.1 (Apple Git-155)
>From f27a8f2d190c45a32a0e8ffc16d015ea26f02be2 Mon Sep 17 00:00:00 2001 From: Nathan Bossart <[email protected]> Date: Tue, 28 Apr 2026 15:27:39 -0500 Subject: [PATCH v4 1/1] Suppress "has no symbols" linker warnings on macOS. 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. Reported-by: Zhang Mingli <[email protected]> Discussion: https://postgr.es/m/229aaaf3-f529-44ed-8e50-00cb6909af21%40Spark Backpatch-through: 14 --- src/port/pg_cpu_x86.c | 7 ++++++- src/port/pg_popcount_aarch64.c | 8 +++++++- src/port/pg_popcount_x86.c | 8 +++++++- 3 files changed, 20 insertions(+), 3 deletions(-) diff --git a/src/port/pg_cpu_x86.c b/src/port/pg_cpu_x86.c index 150b4a1d574..2a4eae8688b 100644 --- a/src/port/pg_cpu_x86.c +++ b/src/port/pg_cpu_x86.c @@ -263,5 +263,10 @@ x86_hypervisor_tsc_frequency_khz(void) return 0; } +#else + +/* prevent linker complaints about empty module */ +extern int pg_cpu_x86_dummy_variable; +int pg_cpu_x86_dummy_variable = 0; -#endif /* defined(USE_SSE2) || defined(__i386__) */ +#endif diff --git a/src/port/pg_popcount_aarch64.c b/src/port/pg_popcount_aarch64.c index 3969a42523c..68a768bac01 100644 --- a/src/port/pg_popcount_aarch64.c +++ b/src/port/pg_popcount_aarch64.c @@ -463,4 +463,10 @@ pg_popcount_masked_neon(const char *buf, int bytes, uint8 mask) return popcnt; } -#endif /* USE_NEON */ +#else + +/* prevent linker complaints about empty module */ +extern int pg_popcount_aarch64_dummy_variable; +int pg_popcount_aarch64_dummy_variable = 0; + +#endif diff --git a/src/port/pg_popcount_x86.c b/src/port/pg_popcount_x86.c index 91579e6b569..b3a6d8b3b0c 100644 --- a/src/port/pg_popcount_x86.c +++ b/src/port/pg_popcount_x86.c @@ -301,4 +301,10 @@ pg_popcount_masked_sse42(const char *buf, int bytes, uint8 mask) return popcnt; } -#endif /* HAVE_X86_64_POPCNTQ */ +#else + +/* prevent linker complaints about empty module */ +extern int pg_popcount_x86_dummy_variable; +int pg_popcount_x86_dummy_variable = 0; + +#endif -- 2.50.1 (Apple Git-155)
