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List:       gcc-patches
Subject:    [committed] libstdc++: Fix build for targets without _Float128 [PR109921]
From:       Jonathan Wakely via Gcc-patches <gcc-patches () gcc ! gnu ! org>
Date:       2023-05-31 20:05:32
Message-ID: 20230531200532.6935-1-jwakely () redhat ! com
[Download RAW message or body]

Tested x86_64-linux. Built msp430-elf and cris-elf. Pushed to trunk.

-- >8 --

My r14-1431-g7037e7b6e4ac41 change caused the _Float128 overload to be
compiled unconditionally, by moving the USE_STRTOF128_FOR_FROM_CHARS
check into the function body. That function should still only be
compiled if the target actually supports _Float128.

libstdc++-v3/ChangeLog:

	PR libstdc++/109921
	* src/c++17/floating_from_chars.cc: Check __FLT128_MANT_DIG__ is
	defined before trying to use _Float128.
---
 libstdc++-v3/src/c++17/floating_from_chars.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libstdc++-v3/src/c++17/floating_from_chars.cc \
b/libstdc++-v3/src/c++17/floating_from_chars.cc index eea878072b0..f1dd1037bf3 100644
--- a/libstdc++-v3/src/c++17/floating_from_chars.cc
+++ b/libstdc++-v3/src/c++17/floating_from_chars.cc
@@ -1325,7 +1325,7 @@ _ZSt10from_charsPKcS0_RDF128_St12chars_format(const char* \
first,  __ieee128& value,
 					      chars_format fmt) noexcept
 __attribute__((alias ("_ZSt10from_charsPKcS0_Ru9__ieee128St12chars_format")));
-#else
+#elif defined(__FLT128_MANT_DIG__)
 from_chars_result
 from_chars(const char* first, const char* last, _Float128& value,
 	   chars_format fmt) noexcept
-- 
2.40.1


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