gcc: xtensa: don't force PIC for uclinux target

xtensa-uclinux uses bFLT executable file format that cannot relocate
fields representing offsets from data to code. C++ objects built as PIC
use offsets to encode FDE structures. As a result C++ exception handling
doesn't work correctly on xtensa-uclinux. Don't use PIC by default on
xtensa-uclinux.

gcc/
2018-11-07  Max Filippov  <jcmvbkbc@gmail.com>

	Backport from mainline
	2018-11-05  Max Filippov  <jcmvbkbc@gmail.com>

	* config/xtensa/uclinux.h (XTENSA_ALWAYS_PIC): Change to 0.

From-SVN: r265889

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index fbfe44a35e8f8fa31f60aced35b5f98706d2fa39..d6877a588aad323216a07108c6f7f2aacead8204 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2018-11-07  Max Filippov  <jcmvbkbc@gmail.com>
+
+       Backport from mainline
+       2018-11-05  Max Filippov  <jcmvbkbc@gmail.com>
+
+       * config/xtensa/uclinux.h (XTENSA_ALWAYS_PIC): Change to 0.
+
 2018-10-26  Bill Schmidt  <wschmidt@linux.ibm.com>
 
        Backport from mainline

diff --git a/gcc/config/xtensa/uclinux.h b/gcc/config/xtensa/uclinux.h
index ae023d5735131118db9dd7ec8171a508b3eea293..577294cfbd39a514020dd22f14224aab6a374334 100644 (file)
--- a/gcc/config/xtensa/uclinux.h
+++ b/gcc/config/xtensa/uclinux.h
@@ -59,8 +59,8 @@ along with GCC; see the file COPYING3.  If not see
 #undef LOCAL_LABEL_PREFIX
 #define LOCAL_LABEL_PREFIX     "."
 
-/* Always enable "-fpic" for Xtensa Linux.  */
-#define XTENSA_ALWAYS_PIC 1
+/* Don't enable "-fpic" for Xtensa uclinux.  */
+#define XTENSA_ALWAYS_PIC 0
 
 #undef TARGET_LIBC_HAS_FUNCTION
 #define TARGET_LIBC_HAS_FUNCTION no_c99_libc_has_function