mariadb/include/ut0auxconf.h

/* Do not remove this file even though it is empty.
This file is included in univ.i and will cause compilation failure
if not present.
A custom check has been added in the generated
storage/innobase/Makefile.in that is shipped with with the InnoDB Plugin
source archive. This check tries to compile a test program and if
successful then adds "#define HAVE_ATOMIC_PTHREAD_T" to this file.
This is a hack that has been developed in order to check for pthread_t
atomicity without the need to regenerate the ./configure script that is
distributed in the MySQL 5.1 official source archives.
If by any chance Makefile.in and ./configure are regenerated and thus
the hack from Makefile.in wiped away then the "real" check from plug.in
will take over.
*/
branches/zip: Implement a check whether pthread_t objects can be used by GCC atomic builtin functions. This check is implemented in plug.in and defines the macro HAVE_ATOMIC_PTHREAD_T. This macro is checked in univ.i and the relevant part of the code enabled (the one that uses GCC atomics against pthread_t objects). In addition to this, the same program that is compiled as part of the plug.in check is added in ut/ut0auxconf.c. In the InnoDB Plugin source archives that are shipped to the users, a generated Makefile.in is added. That Makefile.in will be modified to compile ut/ut0auxconf.c and define the macro HAVE_ATOMIC_PTHREAD_T if the compilation succeeds. I.e. Makefile.in will emulate the work that is done by plug.in. This is done in order to make the check happen and HAVE_ATOMIC_PTHREAD_T eventually defined without regenerating MySQL's ./configure from ./storage/innobase/plug.in. The point is not to ask users to install the autotools and regenerate ./configure. rb://95 Approved by: Marko 2009-03-05 14:38:59 +00:00			`/* Do not remove this file even though it is empty.`
			`This file is included in univ.i and will cause compilation failure`
			`if not present.`
			`A custom check has been added in the generated`
			`storage/innobase/Makefile.in that is shipped with with the InnoDB Plugin`
			`source archive. This check tries to compile a test program and if`
			`successful then adds "#define HAVE_ATOMIC_PTHREAD_T" to this file.`
			`This is a hack that has been developed in order to check for pthread_t`
			`atomicity without the need to regenerate the ./configure script that is`
			`distributed in the MySQL 5.1 official source archives.`
			`If by any chance Makefile.in and ./configure are regenerated and thus`
			`the hack from Makefile.in wiped away then the "real" check from plug.in`
			`will take over.`
			`*/`