[Bug libstdc++/111936] std::stacktrace cannot be used in a shared library

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111936

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Testing a patch:

--- a/libstdc++-v3/src/libbacktrace/Makefile.am
+++ b/libstdc++-v3/src/libbacktrace/Makefile.am
@@ -49,9 +49,13 @@ WARN_FLAGS = -W -Wall -Wwrite-strings
-Wmissing-format-attribute \
             -Wcast-qual
 C_WARN_FLAGS = $(WARN_FLAGS) -Wstrict-prototypes -Wmissing-prototypes
-Wold-style-definition -Wno-unused-but-set-variable
 CXX_WARN_FLAGS = $(WARN_FLAGS) -Wno-unused-parameter
-AM_CFLAGS = $(C_WARN_FLAGS)
+AM_CFLAGS = \
+       $(glibcxx_lt_pic_flag) $(glibcxx_compiler_shared_flag) \
+       $(C_WARN_FLAGS)
 AM_CFLAGS += $(EXTRA_CFLAGS)
-AM_CXXFLAGS = $(CXX_WARN_FLAGS) -fno-rtti -fno-exceptions
+AM_CXXFLAGS = \
+       $(glibcxx_lt_pic_flag) $(glibcxx_compiler_shared_flag) \
+       $(CXX_WARN_FLAGS) -fno-rtti -fno-exceptions
 AM_CXXFLAGS += $(EXTRA_CXXFLAGS)

 obj_prefix = std_stacktrace