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From: Jory A. Pratt <anarchy@gentoo.org>
CFLAGS must contain -fPIC when checking the linker
https://bugs.gentoo.org/show_bug.cgi?id=607350
diff --git a/build/autoconf/compiler-opts.m4 b/build/autoconf/compiler-opts.m4
--- a/build/autoconf/compiler-opts.m4
+++ b/build/autoconf/compiler-opts.m4
@@ -263,23 +263,26 @@ fi
MOZ_ARG_ENABLE_BOOL(pie,
[ --enable-pie Enable Position Independent Executables],
MOZ_PIE=1,
MOZ_PIE= )
if test "$GNU_CC" -a -n "$MOZ_PIE"; then
AC_MSG_CHECKING([for PIE support])
+ _SAVE_CFLAGS=$CFLAGS
+ CFLAGS="$CFLAGS -fPIC"
_SAVE_LDFLAGS=$LDFLAGS
LDFLAGS="$LDFLAGS -pie"
AC_TRY_LINK(,,AC_MSG_RESULT([yes])
[MOZ_PROGRAM_LDFLAGS="$MOZ_PROGRAM_LDFLAGS -pie"],
AC_MSG_RESULT([no])
AC_MSG_ERROR([--enable-pie requires PIE support from the linker.]))
LDFLAGS=$_SAVE_LDFLAGS
+ CFLAGS=$_SAVE_CFLAGS
fi
AC_SUBST(MOZ_PROGRAM_LDFLAGS)
dnl ASan assumes no symbols are being interposed, and when that happens,
dnl it's not happy with it. Unconveniently, since Firefox is exporting
dnl libffi symbols and Gtk+3 pulls system libffi via libwayland-client,
dnl system libffi interposes libffi symbols that ASan assumes are in
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