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* [gcc r11-8446] libstdc++: Disable floating_to_chars.cc on 16 bit targets
@ 2021-05-20 12:41 Joern Rennecke
0 siblings, 0 replies; only message in thread
From: Joern Rennecke @ 2021-05-20 12:41 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:5f772bd9847cdbf6a7a6d856de87cb65472d56f4
commit r11-8446-g5f772bd9847cdbf6a7a6d856de87cb65472d56f4
Author: Joern Rennecke <joern.rennecke@riscy-ip.com>
Date: Thu May 20 13:21:41 2021 +0100
libstdc++: Disable floating_to_chars.cc on 16 bit targets
This patch conditionally disables the compilation of floating_to_chars.cc
on 16 bit targets, thus fixing a build failure for these targets as
the POW10_SPLIT_2 array exceeds the maximum object size.
libstdc++-v3/
PR libstdc++/100361
* include/std/charconv (to_chars): Hide the overloads for
floating-point types for 16 bit targets.
* src/c++17/floating_to_chars.cc: Don't compile for 16 bit targets.
* testsuite/20_util/to_chars/double.cc: Run this test only on
size32plus targets.
* testsuite/20_util/to_chars/float.cc: Likewise.
* testsuite/20_util/to_chars/long_double.cc: Likewise.
Diff:
---
libstdc++-v3/include/std/charconv | 3 ++-
libstdc++-v3/src/c++17/floating_to_chars.cc | 4 +++-
libstdc++-v3/testsuite/20_util/to_chars/double.cc | 1 +
libstdc++-v3/testsuite/20_util/to_chars/float.cc | 1 +
libstdc++-v3/testsuite/20_util/to_chars/long_double.cc | 1 +
5 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/libstdc++-v3/include/std/charconv b/libstdc++-v3/include/std/charconv
index 6e407f31e30..64a6606bb33 100644
--- a/libstdc++-v3/include/std/charconv
+++ b/libstdc++-v3/include/std/charconv
@@ -703,7 +703,8 @@ namespace __detail
chars_format __fmt = chars_format::general) noexcept;
#endif
-#if _GLIBCXX_FLOAT_IS_IEEE_BINARY32 && _GLIBCXX_DOUBLE_IS_IEEE_BINARY64
+#if _GLIBCXX_FLOAT_IS_IEEE_BINARY32 && _GLIBCXX_DOUBLE_IS_IEEE_BINARY64 \
+ && __SIZE_WIDTH__ >= 32
// Floating-point std::to_chars
// Overloads for float.
diff --git a/libstdc++-v3/src/c++17/floating_to_chars.cc b/libstdc++-v3/src/c++17/floating_to_chars.cc
index 1a0abb9e80f..44f547a77b4 100644
--- a/libstdc++-v3/src/c++17/floating_to_chars.cc
+++ b/libstdc++-v3/src/c++17/floating_to_chars.cc
@@ -50,7 +50,9 @@ extern "C" int __sprintfieee128(char*, const char*, ...);
// This implementation crucially assumes float/double have the
// IEEE binary32/binary64 formats.
-#if _GLIBCXX_FLOAT_IS_IEEE_BINARY32 && _GLIBCXX_DOUBLE_IS_IEEE_BINARY64
+#if _GLIBCXX_FLOAT_IS_IEEE_BINARY32 && _GLIBCXX_DOUBLE_IS_IEEE_BINARY64 \
+ /* And it also assumes that uint64_t POW10_SPLIT_2[3133][3] is valid. */\
+ && __SIZE_WIDTH__ >= 32
// Determine the binary format of 'long double'.
diff --git a/libstdc++-v3/testsuite/20_util/to_chars/double.cc b/libstdc++-v3/testsuite/20_util/to_chars/double.cc
index bb6f74424ed..64e62213044 100644
--- a/libstdc++-v3/testsuite/20_util/to_chars/double.cc
+++ b/libstdc++-v3/testsuite/20_util/to_chars/double.cc
@@ -33,6 +33,7 @@
// { dg-do run { target c++17 } }
// { dg-require-effective-target ieee-floats }
+// { dg-require-effective-target size32plus }
#include <charconv>
diff --git a/libstdc++-v3/testsuite/20_util/to_chars/float.cc b/libstdc++-v3/testsuite/20_util/to_chars/float.cc
index 0c8dd4f66df..73b9081d4ff 100644
--- a/libstdc++-v3/testsuite/20_util/to_chars/float.cc
+++ b/libstdc++-v3/testsuite/20_util/to_chars/float.cc
@@ -33,6 +33,7 @@
// { dg-do run { target c++17 } }
// { dg-require-effective-target ieee-floats }
+// { dg-require-effective-target size32plus }
#include <charconv>
diff --git a/libstdc++-v3/testsuite/20_util/to_chars/long_double.cc b/libstdc++-v3/testsuite/20_util/to_chars/long_double.cc
index 8cf45ad5e94..447e5368811 100644
--- a/libstdc++-v3/testsuite/20_util/to_chars/long_double.cc
+++ b/libstdc++-v3/testsuite/20_util/to_chars/long_double.cc
@@ -35,6 +35,7 @@
// { dg-xfail-run-if "Non-conforming printf (see PR98384)" { *-*-solaris* *-*-darwin* } }
// { dg-require-effective-target ieee-floats }
+// { dg-require-effective-target size32plus }
#include <charconv>
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