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Provide DLLEXPORT markers for C functions via PG_FUNCTION_INFO_V1 macro.

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Second try at the change originally made in commit 8518583cd;
this time with contrib updates so that manual extern declarations
are also marked with PGDLLEXPORT.  The release notes should point
this out as a significant source-code change for extension authors,
since they'll have to make similar additions to avoid trouble on Windows.

Laurenz Albe, doc change by me

Patch: <A737B7A37273E048B164557ADEF4A58B53962ED8@ntex2010a.host.magwien.gv.at>
This commit is contained in:
Tom Lane
2016-11-04 19:04:56 -04:00
parent 20540710e8
commit c8ead2a397
4 changed files with 41 additions and 25 deletions
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2
contrib/hstore/hstore.h
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@ -194,7 +194,7 @@ extern Pairs *hstoreArrayToPairs(ArrayType *a, int *npairs);
#if HSTORE_POLLUTE_NAMESPACE #if HSTORE_POLLUTE_NAMESPACE
#define HSTORE_POLLUTE(newname_,oldname_) \ #define HSTORE_POLLUTE(newname_,oldname_) \
PG_FUNCTION_INFO_V1(oldname_); \ PG_FUNCTION_INFO_V1(oldname_); \
Datum newname_(PG_FUNCTION_ARGS); \ extern PGDLLEXPORT Datum newname_(PG_FUNCTION_ARGS); \
Datum oldname_(PG_FUNCTION_ARGS) { return newname_(fcinfo); } \ Datum oldname_(PG_FUNCTION_ARGS) { return newname_(fcinfo); } \
extern int no_such_variable extern int no_such_variable
#else #else

40
contrib/ltree/ltree.h
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@ -130,30 +130,30 @@ typedef struct
/* use in array iterator */ /* use in array iterator */
Datum ltree_isparent(PG_FUNCTION_ARGS); extern PGDLLEXPORT Datum ltree_isparent(PG_FUNCTION_ARGS);
Datum ltree_risparent(PG_FUNCTION_ARGS); extern PGDLLEXPORT Datum ltree_risparent(PG_FUNCTION_ARGS);
Datum ltq_regex(PG_FUNCTION_ARGS); extern PGDLLEXPORT Datum ltq_regex(PG_FUNCTION_ARGS);
Datum ltq_rregex(PG_FUNCTION_ARGS); extern PGDLLEXPORT Datum ltq_rregex(PG_FUNCTION_ARGS);
Datum lt_q_regex(PG_FUNCTION_ARGS); extern PGDLLEXPORT Datum lt_q_regex(PG_FUNCTION_ARGS);
Datum lt_q_rregex(PG_FUNCTION_ARGS); extern PGDLLEXPORT Datum lt_q_rregex(PG_FUNCTION_ARGS);
Datum ltxtq_exec(PG_FUNCTION_ARGS); extern PGDLLEXPORT Datum ltxtq_exec(PG_FUNCTION_ARGS);
Datum ltxtq_rexec(PG_FUNCTION_ARGS); extern PGDLLEXPORT Datum ltxtq_rexec(PG_FUNCTION_ARGS);
Datum _ltq_regex(PG_FUNCTION_ARGS); extern PGDLLEXPORT Datum _ltq_regex(PG_FUNCTION_ARGS);
Datum _ltq_rregex(PG_FUNCTION_ARGS); extern PGDLLEXPORT Datum _ltq_rregex(PG_FUNCTION_ARGS);
Datum _lt_q_regex(PG_FUNCTION_ARGS); extern PGDLLEXPORT Datum _lt_q_regex(PG_FUNCTION_ARGS);
Datum _lt_q_rregex(PG_FUNCTION_ARGS); extern PGDLLEXPORT Datum _lt_q_rregex(PG_FUNCTION_ARGS);
Datum _ltxtq_exec(PG_FUNCTION_ARGS); extern PGDLLEXPORT Datum _ltxtq_exec(PG_FUNCTION_ARGS);
Datum _ltxtq_rexec(PG_FUNCTION_ARGS); extern PGDLLEXPORT Datum _ltxtq_rexec(PG_FUNCTION_ARGS);
Datum _ltree_isparent(PG_FUNCTION_ARGS); extern PGDLLEXPORT Datum _ltree_isparent(PG_FUNCTION_ARGS);
Datum _ltree_risparent(PG_FUNCTION_ARGS); extern PGDLLEXPORT Datum _ltree_risparent(PG_FUNCTION_ARGS);
/* Concatenation functions */ /* Concatenation functions */
Datum ltree_addltree(PG_FUNCTION_ARGS); extern PGDLLEXPORT Datum ltree_addltree(PG_FUNCTION_ARGS);
Datum ltree_addtext(PG_FUNCTION_ARGS); extern PGDLLEXPORT Datum ltree_addtext(PG_FUNCTION_ARGS);
Datum ltree_textadd(PG_FUNCTION_ARGS); extern PGDLLEXPORT Datum ltree_textadd(PG_FUNCTION_ARGS);
/* Util function */ /* Util function */
Datum ltree_in(PG_FUNCTION_ARGS); extern PGDLLEXPORT Datum ltree_in(PG_FUNCTION_ARGS);
bool ltree_execute(ITEM *curitem, void *checkval, bool ltree_execute(ITEM *curitem, void *checkval,
bool calcnot, bool (*chkcond) (void *checkval, ITEM *val)); bool calcnot, bool (*chkcond) (void *checkval, ITEM *val));

17
doc/src/sgml/xfunc.sgml
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@ -2577,6 +2577,23 @@ concat_text(PG_FUNCTION_ARGS)
error messages to this effect. error messages to this effect.
</para> </para>
</listitem> </listitem>
<listitem>
<para>
To work correctly on Windows, <literal>C</>-language functions need
to be marked with <literal>PGDLLEXPORT</>, unless you use a build
process that marks all global functions that way. In simple cases
this detail will be handled transparently by
the <literal>PG_FUNCTION_INFO_V1</> macro. However, if you write
explicit external declarations (perhaps in header files), be sure
to write them like this:
<programlisting>
extern PGDLLEXPORT Datum funcname(PG_FUNCTION_ARGS);
</programlisting>
or you'll get compiler complaints when building on Windows. (On
other platforms, the <literal>PGDLLEXPORT</> macro does nothing.)
</para>
</listitem>
</itemizedlist> </itemizedlist>
</para> </para>
</sect2> </sect2>

7
src/include/fmgr.h
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@ -350,12 +350,11 @@ typedef const Pg_finfo_record *(*PGFInfoFunction) (void);
* *
* On Windows, the function and info function must be exported. Our normal * On Windows, the function and info function must be exported. Our normal
* build processes take care of that via .DEF files or --export-all-symbols. * build processes take care of that via .DEF files or --export-all-symbols.
* Module authors using a different build process might need to manually * Module authors using a different build process might do it differently,
* declare the function PGDLLEXPORT. We do that automatically here for the * so we declare these functions PGDLLEXPORT for their convenience.
* info function, since authors shouldn't need to be explicitly aware of it.
*/ */
#define PG_FUNCTION_INFO_V1(funcname) \ #define PG_FUNCTION_INFO_V1(funcname) \
extern Datum funcname(PG_FUNCTION_ARGS); \ extern PGDLLEXPORT Datum funcname(PG_FUNCTION_ARGS); \
extern PGDLLEXPORT const Pg_finfo_record * CppConcat(pg_finfo_,funcname)(void); \ extern PGDLLEXPORT const Pg_finfo_record * CppConcat(pg_finfo_,funcname)(void); \
const Pg_finfo_record * \ const Pg_finfo_record * \
CppConcat(pg_finfo_,funcname) (void) \ CppConcat(pg_finfo_,funcname) (void) \