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From: Adhemerval Zanella <azanella@sourceware.org>
To: glibc-cvs@sourceware.org
Subject: [glibc/azanella/clang] Build glibc with -ftrapping-math
Date: Wed, 17 Apr 2024 20:15:28 +0000 (GMT)	[thread overview]
Message-ID: <20240417201529.01C70385F014@sourceware.org> (raw)

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=8565bb7763e71465b2f6dceb2319a785cf9092c0

commit 8565bb7763e71465b2f6dceb2319a785cf9092c0
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Thu Feb 15 08:58:46 2024 -0300

    Build glibc with -ftrapping-math
    
    GCC enables it by default, clang in the other hand sets -fno-trapping-math.
    This is required to fix some math and stdlib tests that explicit raises
    floating point exceptions (i.e. stdlib/tst-strtod-round on aarch64).

Diff:
---
 Makeconfig | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Makeconfig b/Makeconfig
index 3cf894479a..cf0b7ab8b6 100644
--- a/Makeconfig
+++ b/Makeconfig
@@ -883,6 +883,9 @@ endif
 # disable any optimization that assume default rounding mode.
 +math-flags = $(config-cflags-frounding-math)
 
+# We have to assume that glibc functions might generate user-visible traps.
++math-flags += -ftrapping-math
+
 # Logically only "libnldbl", "nonlib" and "testsuite" should be using
 # -fno-math-errno. However due to GCC bug #88576, only "libm" can use
 # -fno-math-errno.

             reply	other threads:[~2024-04-17 20:15 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-04-17 20:15 Adhemerval Zanella [this message]
  -- strict thread matches above, loose matches on Subject: below --
2024-04-02 16:01 Adhemerval Zanella

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