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Commitf2b73c8

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Add central declarations for dlsym()ed symbols
This is in preparation for defaulting to -fvisibility=hidden in extensions,instead of exporting all symbols. For that symbols intended to be exportedneed to be tagged with PGDLLEXPORT. Most extensions only need to do so for_PG_init() and functions defined with PG_FUNCTION_INFO_V1. Adding centraldeclarations avoids each extension having to add PGDLLEXPORT. Any existingdeclarations in extensions will continue to work if fmgr.h is included beforethem, otherwise compilation for Windows will fail.Author: Andres Freund <andres@anarazel.de>Reviewed-By: Tom Lane <tgl@sss.pgh.pa.us>Discussion:https://postgr.es/m/20211101020311.av6hphdl6xbjbuif@alap3.anarazel.de
1 parent31e5b50 commitf2b73c8

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4 files changed

+16
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4 files changed

+16
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‎src/include/fmgr.h

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@@ -424,6 +424,17 @@ CppConcat(pg_finfo_,funcname) (void) \
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extern int no_such_variable
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/*
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* Declare _PG_init/_PG_fini centrally. Historically each shared library had
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* its own declaration; but now that we want to mark these PGDLLEXPORT, using
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* central declarations avoids each extension having to add that. Any
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* existing declarations in extensions will continue to work if fmgr.h is
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* included before them, otherwise compilation for Windows will fail.
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*/
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externPGDLLEXPORTvoid_PG_init(void);
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externPGDLLEXPORTvoid_PG_fini(void);
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/*-------------------------------------------------------------------------
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*Support for verifying backend compatibility of loaded modules
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*

‎src/include/jit/jit.h

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@@ -63,7 +63,7 @@ typedef struct JitContext
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typedefstructJitProviderCallbacksJitProviderCallbacks;
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externvoid_PG_jit_provider_init(JitProviderCallbacks*cb);
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externPGDLLEXPORTvoid_PG_jit_provider_init(JitProviderCallbacks*cb);
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typedefvoid (*JitProviderInit) (JitProviderCallbacks*cb);
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typedefvoid (*JitProviderResetAfterErrorCB) (void);
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typedefvoid (*JitProviderReleaseContextCB) (JitContext*context);

‎src/include/postmaster/pgarch.h

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@@ -63,6 +63,8 @@ typedef struct ArchiveModuleCallbacks
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*/
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typedefvoid (*ArchiveModuleInit) (ArchiveModuleCallbacks*cb);
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externPGDLLEXPORTvoid_PG_archive_module_init(ArchiveModuleCallbacks*cb);
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/*
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* Since the logic for archiving via a shell command is in the core server
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* and does not need to be loaded via a shared library, it has a special

‎src/include/replication/output_plugin.h

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@@ -35,6 +35,8 @@ typedef struct OutputPluginOptions
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*/
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typedefvoid (*LogicalOutputPluginInit) (structOutputPluginCallbacks*cb);
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externPGDLLEXPORTvoid_PG_output_plugin_init(structOutputPluginCallbacks*cb);
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/*
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* Callback that gets called in a user-defined plugin. ctx->private_data can
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* be set to some private data.

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