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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: r265890
This commit is contained in:
Max Filippov 2018-11-07 20:52:55 +00:00 committed by Max Filippov
parent e31ae982c4
commit 39a300fd08
2 changed files with 9 additions and 2 deletions
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gcc/ChangeLog
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@ -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 Release Manager
* GCC 6.5.0 released.

4
gcc/config/xtensa/uclinux.h
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@ -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