For platforms like Mingw and Cygwin, cygwin refuses to generate the shared library without using -no-undefined.
Attached patch makes sure the right flags are used, since libtool is already used to link libstdc++. Patch OK?
From 4ba039687182fccd67e1170f89e259e1c4a58eeb Mon Sep 17 00:00:00 2001
From: Jonathan Yong <10wa...@gmail.com>
Date: Sun, 22 Mar 2020 09:56:58 +0800
Subject: [PATCH 1/1] libstdc++: use lt_host_flags for libstdc++.la
Signed-off-by: Jonathan Yong <10wa...@gmail.com>
---
libstdc++-v3/src/Makefile.am | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libstdc++-v3/src/Makefile.am b/libstdc++-v3/src/Makefile.am
index a139adc81b3..498f533f3d3 100644
--- a/libstdc++-v3/src/Makefile.am
+++ b/libstdc++-v3/src/Makefile.am
@@ -107,7 +107,7 @@ libstdc___la_DEPENDENCIES = \
libstdc___la_LDFLAGS = \
-version-info $(libtool_VERSION) ${version_arg} -lm
-libstdc___la_LINK = $(CXXLINK) $(libstdc___la_LDFLAGS)
+libstdc___la_LINK = $(CXXLINK) $(libstdc___la_LDFLAGS) $(lt_host_flags)
# Use special rules for compatibility-ldbl.cc compilation, as we need to
# pass -mlong-double-64.
--
2.11.4.GIT
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