[Bug libstdc++/100017] [11/12 regression] error: 'fenv_t' has not been declared in '::' -- cross toolchain fails to build

["unlvsur at live dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100017

--- Comment #21 from cqwrteur <unlvsur at live dot com> ---
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________________________________
From: yangyujie at alumni dot sjtu.edu.cn <gcc-bugzilla@gcc.gnu.org>
Sent: Wednesday, August 4, 2021 3:45:37 AM
To: unlvsur@live.com <unlvsur@live.com>
Subject: [Bug libstdc++/100017] [11/12 regression] error: 'fenv_t' has not been
declared in '::' -- cross toolchain fails to build

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Yujie Yang <yangyujie at alumni dot sjtu.edu.cn> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |yangyujie at alumni dot
sjtu.edu.c
                   |                            |n

--- Comment #20 from Yujie Yang <yangyujie at alumni dot sjtu.edu.cn> ---
This patch works for my cross-native build.

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


-RAW_CXX_FOR_TARGET="$CXX_FOR_TARGET"
+RAW_CXX_FOR_TARGET="$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, strip)
 ACX_CHECK_INSTALLED_TARGET_TOOL(WINDRES_FOR_TARGET, windres)
 ACX_CHECK_INSTALLED_TARGET_TOOL(WINDMC_FOR_TARGET, windmc)

-RAW_CXX_FOR_TARGET="$CXX_FOR_TARGET"
+RAW_CXX_FOR_TARGET="$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])

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