first part, for autotools build.
config/ac-macros/maintainer.m4:
Add the flag. With it, and as we use -Werror, we nicely get
"error: ISO C90 forbids mixed declarations and code" if
a declaration follows a statement in C code.
Note that g++ refuses this flag.
Enable the MySQL maintainer-specific development environment
(which add various warning related options to the compiler
flags) if debugging support is enabled.
config/ac-macros/maintainer.m4:
Enable the maintainer mode if debug support is enabled.
configure.in:
Move debug argument to before the maintainer mode check.
Temporarily disable strict aliasing warnings in order to get
wider coverage for optimized builds. Once the violations are
fixed and false-positives silenced, this flag should be removed.
Introduce a MySQL maintainer/developer mode that enables
a set of warning options for the C/C++ compiler. This mode
is intended to help improve the overall quality of the code.
The warning options are:
C_WARNINGS="-Wall -Wextra -Wunused -Wwrite-strings -Werror"
CXX_WARNINGS="$C_WARNINGS -Wno-unused-parameter"
Since -Wall is essentially a moving target, autoconf checks
are not run with warning options enabled, in particualr -Werror.
This decision might be revisited in the future. The patch also
fixes a mistake in the makefiles, where automake CXXFLAGS would
be set to CFLAGS.
config/ac-macros/maintainer.m4:
Add a set of default compiler flags used when in maintainer mode.
configure.in:
Hook into the maintainer mode. Disabled by default.
