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configure: Define __cproc__, support Clang preprocessor #6

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configure: Define __cproc__, support Clang preprocessor #6

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9 changes: 8 additions & 1 deletion configure
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Original file line number Diff line number Diff line change
Expand Up @@ -142,9 +142,16 @@ static const char *const endfiles[] = {$endfiles};
static const char *const preprocesscmd[] = {
"$DEFAULT_PREPROCESSOR",

/* clear preprocessor GNU C version */
/* clear preprocessor GNU C & Clang definitions */
"-U", "__GNUC__",
"-U", "__GNUC_MINOR__",
"-U", "__clang__",
"-U", "__clang_major__",
"-U", "__clang_minor__",
"-U", "__llvm__",

/* cproc detection definition */
"-D", "__cproc__",

/* we don't yet support these optional features */
"-D", "__STDC_NO_ATOMICS__",
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