D29686.diff
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	diff --git a/lib/msun/Makefile b/lib/msun/Makefile
	--- a/lib/msun/Makefile
	+++ b/lib/msun/Makefile
	@@ -34,6 +34,16 @@

	CFLAGS+= -I${.CURDIR}/${ARCH_SUBDIR}

	+.include <bsd.compiler.mk>
	+.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 100000
	+# When using clang with x86_64 CPUs that support AVX, some floating point
	+# transformations may raise exceptions that would not have been raised by the
	+# original code. To avoid this, use the -fp-exception-behavior=maytrap flag,
	+# introduced in clang 10.0.0.
	+# See also: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254911
	+CFLAGS+= -ffp-exception-behavior=maytrap
	+.endif
	+
	.PATH: ${.CURDIR}/bsdsrc
	.PATH: ${.CURDIR}/src
	.PATH: ${.CURDIR}/man
	@@ -113,7 +123,6 @@
	# 'long double' [-Werror=overflow]
	# if( y >= LDBL_MAX )
	# See also: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=130067
	-.include <bsd.compiler.mk>
	.if ${COMPILER_TYPE} == "gcc"
	CFLAGS.e_powl.c+= -Wno-error=overflow
	.endif