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From: "bneumeier at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/80196] fenv_t not declared
Date: Fri, 20 Aug 2021 22:00:58 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D80196

Brett Neumeier <bneumeier at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bneumeier at gmail dot com

--- Comment #13 from Brett Neumeier <bneumeier at gmail dot com> ---
I ran into this issue with:

--build=3Daarch64-unknown-linux-gnu
--host=3Dx86_64-unknown-linux-gnu
--target=3Dx86_64-unknown-linux-gnu


I applied this patch from Yujie Yang, on comment 20 of PR 100017, and it fi=
xed
the issue for me.

diff --git a/configure b/configure
index 6157a8c87fb..2a4a05b4edf 100755
--- a/configure
+++ b/configure
@@ -16653,7 +16653,7 @@ else
 fi


-RAW_CXX_FOR_TARGET=3D"$CXX_FOR_TARGET"
+RAW_CXX_FOR_TARGET=3D"$CXX_FOR_TARGET -nostdinc++"

 { $as_echo "$as_me:${as_lineno-$LINENO}: checking where to find the target=
 ar"
>&5
 $as_echo_n "checking where to find the target ar... " >&6; }
diff --git a/configure.ac b/configure.ac
index 2ff48941754..01ecc8c42d9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3515,7 +3515,7 @@ ACX_CHECK_INSTALLED_TARGET_TOOL(STRIP_FOR_TARGET, str=
ip)
 ACX_CHECK_INSTALLED_TARGET_TOOL(WINDRES_FOR_TARGET, windres)
 ACX_CHECK_INSTALLED_TARGET_TOOL(WINDMC_FOR_TARGET, windmc)

-RAW_CXX_FOR_TARGET=3D"$CXX_FOR_TARGET"
+RAW_CXX_FOR_TARGET=3D"$CXX_FOR_TARGET -nostdinc++"

 GCC_TARGET_TOOL(ar, AR_FOR_TARGET, AR, [binutils/ar])
 GCC_TARGET_TOOL(as, AS_FOR_TARGET, AS, [gas/as-new])=