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3aa23078ac
It's mostly not used anymore and doesn't do what it says it does. The docs state that it affects GList, GSList, GNode, GMemChunks, GSignal, GType n_preallocs and GBSearchArray while: * GList, GSList and GNode use GSlice and are not affected * GMemChunks is gone * GType npreallocs is ignored It also states that it can be used to force the usage of g_malloc/g_free, which is handled by G_SLICE=always-malloc now. The only places where it's used is in signal handling through GBSearchArray and in GValueArray (deprecated). Since it's unlikely that anyone wants to reduce allocation sizes just for those cases remove the build option.
58 lines
2.4 KiB
Plaintext
58 lines
2.4 KiB
Plaintext
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GLib's configure options and corresponding macros
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=================================================
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--enable-debug=no
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-DG_DISABLE_ASSERT -DG_DISABLE_CHECKS
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--enable-debug=minimum [default for stable branches]
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none
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--enable-debug=yes [default for development branches]
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-DG_ENABLE_DEBUG -g
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Besides these, there are some local feature specific options, but my main
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focus here is to concentrate on macros that affect overall GLib behaviour
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and/or third party code.
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Notes on GLib's internal and global macros
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==========================================
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G_DISABLE_ASSERT
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The g_assert() and g_assert_not_reached() become non-functional
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with this define. The motivation is to speed up end-user apps by
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avoiding expensive checks.
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This macro can affect third-party code. --enable-debug=no will only
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disable the assertion macros for GLib itself, but third-party code
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that passes -DG_DISABLE_ASSERT to the compiler upon its own build
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will end up with the non-functional variants after including glib.h
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as well.
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NOTE: Code inside the assertion macros should not have side effects
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that affect the operation of the program.
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G_DISABLE_CHECKS
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This macro is similar to G_DISABLE_ASSERT, it affects third-party
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code as mentioned above and the NOTE about G_DISABLE_ASSERT applies
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too. The macros that become non-functional here are
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g_return_if_fail(), g_return_val_if_fail(), g_return_if_reached() and
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g_return_val_if_reached().
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Additionally the glib_mem_profiler_table and g_mem_profile() from
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gmem.h become non-functional if this macro is supplied.
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This macro also switches off certain checks in the GSignal code.
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G_ENABLE_DEBUG
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Quite a bit of additional debugging code is compiled into GLib for this
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macro, and since it is a globally visible define, third-party code may
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be affected by it similar to G_DISABLE_ASSERT.
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The additional code executed/compiled for this macro currently involve:
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- extra validity checks for GDate
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- memory profiling traps in gmem.c (consult debugging.txt for details)
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- BREAKPOINT abortion for fatal log levels in gmessage.c instead of
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plain abort() to allow debuggers trapping and overriding them
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- added verbosity of gscanner.c to catch deprecated code paths
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- added verbosity of gutils.c to catch deprecated code paths
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- object ref/unref traps (consult debugging.txt) and object bookkeeping
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in gobject.c
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- extra validity checks in gsignal.c
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2000/12/28 Tim Janik
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