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libstdc++: adjust std module TBB workaround

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Messing with macros before possibly importing the stdc++.h header unit is
bad form; better to mess with (other) macros afterward.

libstdc++-v3/ChangeLog:

	* src/c++23/std.cc.in: Move TBB macro shenanigans after
	bits/stdc++.h.
This commit is contained in:
Jason Merrill
2025-11-03 18:55:06 +03:00
parent eaf6b40f76
commit 237a83da19
1 changed files with 6 additions and 3 deletions
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9
libstdc++-v3/src/c++23/std.cc.in
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@@ -23,11 +23,14 @@
module;
#include <bits/stdc++.h>
// stdc++.h doesn't include <execution> because of TBB issues;
// FIXME for now let's avoid the problem by suppressing TBB.
#define _GLIBCXX_USE_TBB_PAR_BACKEND 0
#include <bits/stdc++.h>
#ifdef _PSTL_PAR_BACKEND_TBB
#undef _PSTL_PAR_BACKEND_TBB
#define _PSTL_PAR_BACKEND_SERIAL
#endif
#include <execution>
// Module std does include deprecated library interfaces.