Add -Wl,--export-dynamic to standard LDFLAGS if supported

From the ld man page:

  When creating a dynamically linked executable, using the -E option or
  the --export-dynamic option causes the linker to add all symbols to
  the dynamic symbol table.  The dynamic symbol table is the set of
  symbols which are visible from dynamic objects at run time.

This should allow the backtrace(3) to fully resolve the symbols when
creating backtrace on an assertion failure.

(cherry picked from commit b05e20c9685ca8168681d360720c7c94a4fd6f0a)

diff --git a/Makefile.top b/Makefile.top
index 68bbc1242dcb654e81197b4879fb7b82aa07c83f..62c5293c2c7555c54fd6c3ab100e7cb2a3510114 100644 (file)
--- a/Makefile.top
+++ b/Makefile.top
@@ -11,7 +11,8 @@ AM_CPPFLAGS =                                 \
        -include $(top_builddir)/config.h       \
        -I$(srcdir)/include
 
-AM_LDFLAGS =
+AM_LDFLAGS =                                   \
+       $(STD_LDFLAGS)
 LDADD =
 
 if HOST_MACOS

diff --git a/configure.ac b/configure.ac
index 6dc4dae91aed3aa9d71ce037af6c543c4ad5a5c4..d4c0fbe6588b15135e33d7e4ce783b5072b81c8d 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -112,13 +112,15 @@ AS_IF([test "$enable_static" != "no" && test "$enable_developer" != "yes"],
       [AC_MSG_ERROR([Static linking is not supported as it disables dlopen() and certain security features (e.g. RELRO, ASLR)])])
 
 #
-# Set the default CFLAGS and CPPFLAGS
+# Set the default CFLAGS, CPPFLAGS, and LDFLAGS
 #
 STD_CFLAGS="-Wall -Wextra -Wwrite-strings -Wpointer-arith -Wno-missing-field-initializers -Wformat -Wshadow"
 
 # These should be always errors
 STD_CFLAGS="$STD_CFLAGS -Werror=implicit-function-declaration -Werror=missing-prototypes -Werror=format-security -Werror=parentheses -Werror=implicit -Werror=strict-prototypes -Werror=vla"
 
+STD_LDFLAGS=""
+
 # ... except in test code
 TEST_CFLAGS="-Wno-vla"
 
@@ -136,6 +138,9 @@ AX_CHECK_COMPILE_FLAG([-Werror -fno-delete-null-pointer-checks],
 AX_CHECK_COMPILE_FLAG([-fdiagnostics-show-option],
                      [STD_CFLAGS="$STD_CFLAGS -fdiagnostics-show-option"])
 
+AX_CHECK_LINK_FLAG([-Wl,--export-dynamic],
+                  [STD_LDFLAGS="$STD_LDFLAGS -Wl,--export-dynamic"])
+
 host_macos=no
 AS_CASE([$host],[*-darwin*],[host_macos=yes])
 AM_CONDITIONAL([HOST_MACOS], [test "$host_macos" = "yes"])
@@ -162,6 +167,7 @@ AS_IF([test "$enable_developer" = "yes"],
 AC_SUBST([DEVELOPER_MODE])
 AC_SUBST([STD_CFLAGS])
 AC_SUBST([STD_CPPFLAGS])
+AC_SUBST([STD_LDFLAGS])
 AC_SUBST([TEST_CFLAGS])
 
 # [pairwise: --enable-warn-error, --disable-warn-error]