[gcc r10-10789] Darwin : Make trampoline templates linker-visible.

[gcc r10-10789] Darwin : Make trampoline templates linker-visible.

[Iain D Sandoe]

https://gcc.gnu.org/g:92f4797ac645c81b6299729113b4d20fbc836007

commit r10-10789-g92f4797ac645c81b6299729113b4d20fbc836007
Author: Iain Sandoe <iain@sandoe.co.uk>
Date:   Wed Sep 2 20:33:00 2020 +0100

    Darwin : Make trampoline templates linker-visible.
    
    For aarch64, the alignment of the LTRAMPn symbols matters.
    
    Actually, the LTRAMPn  symbols _are_ 8 byte aligned, but because
    they are Local, the linker doesn't know that this guarantee can be met.
    It assumes that they are not necessarily more aligned than the
    containing section (ld64 atoms strike again).
    
    The fix is to publish the trampoline symbol for the linker to access
    directly - it can then see that the atom is suitably aligned.
    
    Fixes issue #11 on the development branch.
    
    Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
    
    gcc/ChangeLog:
    
            * config/darwin.h (ASM_GENERATE_INTERNAL_LABEL): Add LTRAMP
            to the list of symbol prefixes that must be made linker-
            visible.
    
    (cherry picked from commit f1e2879ecfc8897df0e25a53e81d1868363c5e08)

Diff:
---
 gcc/config/darwin.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gcc/config/darwin.h b/gcc/config/darwin.h
index 050ae00db1b..64f12d76625 100644
--- a/gcc/config/darwin.h
+++ b/gcc/config/darwin.h
@@ -839,6 +839,8 @@ extern GTY(()) section * darwin_sections[NUM_DARWIN_SECTIONS];
       sprintf (LABEL, "*%s%ld", "lubsan_type", (long)(NUM));\
     else if (strcmp ("LASAN", PREFIX) == 0)	\
       sprintf (LABEL, "*%s%ld", "lASAN", (long)(NUM));\
+    else if (strcmp ("LTRAMP", PREFIX) == 0)	\
+      sprintf (LABEL, "*%s%ld", "lTRAMP", (long)(NUM));\
     else						\
       sprintf (LABEL, "*%s%ld", PREFIX, (long)(NUM));	\
   } while (0)