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BUILD: import/mt_list: support building with TCC

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TCC is often convenient to quickly test builds, run CI tests etc. It has
limited thread support (e.g. no thread-local stuff) but that is often
sufficient for testing. TCC lacks __atomic_exchange_n() but has the
exactly equivalent __atomic_exchange(), and doesn't have any barrier.
For this reason we force the atomic_exchange to use the stricter SEQ_CST
mem ordering that allows to ignore the barrier.

[wt: that's upstream commit ca8b865 ("BUILD: support building with TCC")]
This commit is contained in:
Willy Tarreau 2024-11-05 15:25:31 +01:00
parent d1adfd9fe4
commit 033db091fc
1 changed files with 13 additions and 0 deletions
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13
include/import/mt_list.h
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@ -33,6 +33,19 @@
#include <inttypes.h> #include <inttypes.h>
#include <stddef.h> #include <stddef.h>
#if defined(__TINYC__)
/* TCC has __atomic_exchange() for gcc's __atomic_exchange_n(). However it does
* not have any barrier, so we're forcing the order to the stricter SEQ_CST
* instead. There's no thread-local, thus we define __thread, which is only
* used for the PRNG used when sleeping, so we don't care. Anyway tcc with this
* code is mostly used to validate builds and run single-threaded tests.
*/
#include <stdatomic.h>
#define __atomic_exchange_n(val, new, order) __atomic_exchange(val, new, __ATOMIC_SEQ_CST)
#define __atomic_thread_fence(order) do { } while (0)
#define __thread
#endif
/* set NOINLINE to forcefully disable user functions inlining */ /* set NOINLINE to forcefully disable user functions inlining */
#if defined(NOINLINE) #if defined(NOINLINE)
#define MT_INLINE __attribute__((noinline)) #define MT_INLINE __attribute__((noinline))