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Bug#1014082: libpg-query: ftbfs on riscv64: ( error: #error PostgreSQL does not have native spinlock support on this platform.)



Source: libpg-query
Version: 13-2.1.2-1
Severity: minor
Tags: ftbfs, patch
User: debian-riscv@lists.debian.org
Usertags: riscv64
X-Debbugs-Cc: debian-riscv@lists.debian.org


Dear libpg-query Maintainer,

The libpg-query has a ftbfs issue on riscv64:

```
...
In file included from ./src/postgres/include/storage/condition_variable.h:26,
                 from ./src/postgres/include/nodes/execnodes.h:25,
                 from ./src/postgres/include/catalog/index.h:18,
                 from src/pg_query_deparse.c:5:
./src/postgres/include/storage/s_lock.h:922:2: error: #error PostgreSQL does not have native spinlock support on this platform. To continue the compilation, rerun configure using --disable-spinlocks. However, performance will be poor. Please report this to pgsql-bugs@lists.postgresql.org.
  922 | #error PostgreSQL does not have native spinlock support on this platform.  To continue the compilation, rerun configure using --disable-spinlocks.  However, performance will be poor.  Please report this to pgsql-bugs@lists.postgresql.org.
      |  ^~~~~
./src/postgres/include/storage/s_lock.h:994:30: error: unknown type name ‘slock_t’
  994 | extern int      tas(volatile slock_t *lock);            /* in port/.../tas.s, or
      |                              ^~~~~~~
./src/postgres/include/storage/s_lock.h:1004:8: error: unknown type name ‘slock_t’
 1004 | extern slock_t dummy_spinlock;
      |        ^~~~~~~
./src/postgres/include/storage/s_lock.h:1009:28: error: unknown type name ‘slock_t’
 1009 | extern int s_lock(volatile slock_t *lock, const char *file, int line, const char *func);
      |                            ^~~~~~~
In file included from ./src/postgres/include/nodes/execnodes.h:25,
                 from ./src/postgres/include/catalog/index.h:18,
...

```

The patch attached is to fix the issue and I build libpg-query package
successfully on my locally real riscv64 hardware(Unmatched board).

If there are any issues please let me know. thank you.

Bo
-- 
Best Regards,

The code refer to:

https://github.com/postgres/postgres/blob/master/src/include/storage/s_lock.h

Bo YU <tsu.yubo@gmail.com>
--- a/src/postgres/include/storage/s_lock.h
+++ b/src/postgres/include/storage/s_lock.h
@@ -339,6 +339,27 @@
 #endif	 /* HAVE_GCC__SYNC_INT32_TAS */
 #endif	 /* __arm__ || __arm || __aarch64__ || __aarch64 */
 
+/*
+ * RISC-V likewise uses __sync_lock_test_and_set(int *, int) if available.
+ */
+#if defined(__riscv)
+#ifdef HAVE_GCC__SYNC_INT32_TAS
+#define HAS_TEST_AND_SET
+
+#define TAS(lock) tas(lock)
+
+typedef int slock_t;
+
+static __inline__ int
+tas(volatile slock_t *lock)
+{
+	return __sync_lock_test_and_set(lock, 1);
+}
+
+#define S_UNLOCK(lock) __sync_lock_release(lock)
+
+#endif	 /* HAVE_GCC__SYNC_INT32_TAS */
+#endif	 /* __riscv */
 
 /* S/390 and S/390x Linux (32- and 64-bit zSeries) */
 #if defined(__s390__) || defined(__s390x__)

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