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3f759b57cb
* Major documentation revamp: howto -> guide + reference (csilvers) * Protect auto-generated #include files with header guard (dnovillo) * PORTING: autoconf macros to get cygwin/mingw to compile (csilvers)
37 lines
1.7 KiB
Plaintext
37 lines
1.7 KiB
Plaintext
# Check whether InterlockedExchange() takes a LONG or a volatile LONG
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# as its first argument. InterlockedCompareExchange is a windows
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# function; obviously, this macro is useful only for cygwin and mingw,
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# and other systems that compile against the windows API.
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#
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# Apparently the interface for this function is a bit inconsistent.
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# Windows likes volatile LONG, but mingw and cygwin don't, at least
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# for the versions I'm using. But rather than try to guess who
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# supports what, let's just check at configure time. (Note: this
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# is an error in C++ but only a warning in C, so we test in the former.)
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#
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# This function returns 'yes' if the type does not need volatile,
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# and defines the symbol INTERLOCKED_EXCHANGE_NONVOLATILE. (This
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# is the expected case for mingw and cygwin). It returns 'no',
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# and defines no symbol, otherwise. (This is the expected case for
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# MSVC.) The return value was sset this way so that we don't need
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# to define any symbols on windows, which doesn't run configure.
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AC_DEFUN([AC_INTERLOCKED_EXCHANGE_NONVOLATILE],
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[
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AC_MSG_CHECKING(whether first argument to InterlockedExchange omits volatile)
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AC_CACHE_VAL(ac_cv_interlocked_exchange_nonvolatile,
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[AC_LANG_SAVE
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AC_LANG_CPLUSPLUS
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AC_TRY_COMPILE([#include <windows.h>],
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[volatile LONG once; InterlockedExchange(&once, 1);],
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ac_cv_interlocked_exchange_nonvolatile="no",
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ac_cv_interlocked_exchange_nonvolatile="yes")
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AC_LANG_RESTORE
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])
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if test "$ac_cv_interlocked_exchange_nonvolatile" = "yes"; then
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AC_DEFINE(INTERLOCKED_EXCHANGE_NONVOLATILE, 1,
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[define if first argument to InterlockedExchange is just LONG])
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fi
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AC_MSG_RESULT($ac_cv_interlocked_exchange_nonvolatile)
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])
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