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README.win32.md: Update info for G_PLATFORM_WIN32

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Correct the info on G_PLATFORM_WIN32, now that we only define it when
GLib is built for native Windows, not Cygwin.  Make it clear that it
should not be used to check for conditional compilation for Cygwin
builds of GLib.
This commit is contained in:
Chun-wei Fan 2023-04-06 15:40:07 +08:00
parent 9ec6695a72
commit 553d82c793
1 changed files with 6 additions and 7 deletions
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README.win32.md
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@ -30,17 +30,16 @@ On Windows setting up a correct build environment is very similar to typing
The following preprocessor macros are to be used for conditional The following preprocessor macros are to be used for conditional
compilation related to Win32 in GLib-using code: compilation related to Win32 in GLib-using code:
- `G_OS_WIN32` is defined when compiling for native Win32, without - `G_OS_WIN32` and `G_PLATFORM_WIN32` are defined when compiling for native
any POSIX emulation, other than to the extent provided by the Win32, without any POSIX emulation, other than to the extent provided by
bundled Microsoft C library. the bundled Microsoft C library. Either can be used to check when
conditionally compiling GLib-using code for Win32.
- `G_WITH_CYGWIN` is defined if compiling for the Cygwin - `G_WITH_CYGWIN` is defined if compiling for the Cygwin
environment. Note that `G_OS_WIN32` is *not* defined in that case, as environment. Note that `G_OS_WIN32` is *not* defined in that case, as
Cygwin is supposed to behave like Unix. `G_OS_UNIX` *is* defined by a GLib Cygwin is supposed to behave like Unix. `G_OS_UNIX` *is* defined by a GLib
for Cygwin. for Cygwin, but `G_PLATFORM_WIN32` is *no longer* defined by GLib for
Cygwin.
- `G_PLATFORM_WIN32` is defined when either `G_OS_WIN32` or `G_WITH_CYGWIN`
is defined.
These macros are defined in `glibconfig.h`, and are thus available in These macros are defined in `glibconfig.h`, and are thus available in
all source files that include `<glib.h>`. all source files that include `<glib.h>`.