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* [gcc r14-4307] libgfortran: Use __builtin_unreachable() not -Wno-stringop-overflow to silence warning
@ 2023-09-28 11:14 Tobias Burnus
0 siblings, 0 replies; only message in thread
From: Tobias Burnus @ 2023-09-28 11:14 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:4f41d497c9eeec6f97a5c240e03c7e5e1a1ec05e
commit r14-4307-g4f41d497c9eeec6f97a5c240e03c7e5e1a1ec05e
Author: Tobias Burnus <tobias@codesourcery.com>
Date: Thu Sep 28 13:06:13 2023 +0200
libgfortran: Use __builtin_unreachable() not -Wno-stringop-overflow to silence warning
The only caller of write_z is formatted_transfer_scalar_write that passes
kind to 'len'; in turn, write_z is the only caller of xtoa_big, passing on
its 'len'. The kind is passed as is, except for GFC_REAL_17 for which
len = 16 is used.
libgfortran/
* io/write.c (xtoa_big): Change a 'GCC diagnostic ignored
"-Wstringop-overflow"' to an assumption (via __builtin_unreachable).t
Diff:
---
libgfortran/io/write.c | 17 +++++++++--------
1 file changed, 9 insertions(+), 8 deletions(-)
diff --git a/libgfortran/io/write.c b/libgfortran/io/write.c
index 5d47a6d25f7..00c8fd2e288 100644
--- a/libgfortran/io/write.c
+++ b/libgfortran/io/write.c
@@ -1179,6 +1179,15 @@ xtoa_big (const char *s, char *buffer, int len, GFC_UINTEGER_LARGEST *n)
uint8_t h, l;
int i;
+ /* write_z, which calls xtoa_big, is called from transfer.c,
+ formatted_transfer_scalar_write. There it is passed the kind as
+ 'len' argument, which means a maximum of 16. The buffer is large
+ enough, but the compiler does not know that, so shut up the
+ warning here. */
+
+ if (len > 16)
+ __builtin_unreachable ();
+
q = buffer;
if (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
@@ -1212,15 +1221,7 @@ xtoa_big (const char *s, char *buffer, int len, GFC_UINTEGER_LARGEST *n)
}
}
- /* write_z, which calls xtoa_big, is called from transfer.c,
- formatted_transfer_scalar_write. There it is passed the kind as
- argument, which means a maximum of 16. The buffer is large
- enough, but the compiler does not know that, so shut up the
- warning here. */
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wstringop-overflow"
*q = '\0';
-#pragma GCC diagnostic pop
if (*n == 0)
return "0";
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