[gcc r11-3235] libbacktrace, Mach-O : Support PowerPC archs.

[Iain D Sandoe <iains@gcc.gnu.org>]

https://gcc.gnu.org/g:d1339b519ae8cc4ae550baa127a21d8350462837

commit r11-3235-gd1339b519ae8cc4ae550baa127a21d8350462837
Author: Iain Sandoe <iain@sandoe.co.uk>
Date:   Wed Sep 16 08:03:05 2020 +0100

    libbacktrace, Mach-O : Support PowerPC archs.
    
    This adds the PPC architecture variants for Mach-O libbacktrace.
    
    With this (as for X86 and Arm) when dsymutil is run on the binary
    we get a basic usable backtrace.
    
    Testsuite results on powerpc-apple-darwin9 are the same as for X86:
     * btest fails (TBC why)
     * dwarf5 tests fail because dsymutil does not handle that so far.
    
    libbacktrace/ChangeLog:
    
            * macho.c (MACH_O_CPU_TYPE_PPC): New.
            (MACH_O_CPU_TYPE_PPC64): New.
            Add compile-tests for powerpc to the Mach-O variants.

Diff:
---
 libbacktrace/macho.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libbacktrace/macho.c b/libbacktrace/macho.c
index 241d54b5e5e..1f8bc50238f 100644
--- a/libbacktrace/macho.c
+++ b/libbacktrace/macho.c
@@ -128,9 +128,11 @@ struct macho_fat_arch_64
 
 #define MACH_O_CPU_TYPE_X86 7
 #define MACH_O_CPU_TYPE_ARM 12
+#define MACH_O_CPU_TYPE_PPC 18
 
 #define MACH_O_CPU_TYPE_X86_64 (MACH_O_CPU_TYPE_X86 | MACH_O_CPU_ARCH_ABI64)
 #define MACH_O_CPU_TYPE_ARM64  (MACH_O_CPU_TYPE_ARM | MACH_O_CPU_ARCH_ABI64)
+#define MACH_O_CPU_TYPE_PPC64  (MACH_O_CPU_TYPE_PPC | MACH_O_CPU_ARCH_ABI64)
 
 /* The header of a load command.  */
 
@@ -776,6 +778,10 @@ macho_add_fat (struct backtrace_state *state, const char *filename,
   cputype = MACH_O_CPU_TYPE_ARM64;
 #elif defined (__arm__)
   cputype = MACH_O_CPU_TYPE_ARM;
+#elif defined (__ppc__)
+  cputype = MACH_O_CPU_TYPE_PPC;
+#elif defined (__ppc64__)
+  cputype = MACH_O_CPU_TYPE_PPC64;
 #else
   error_callback (data, "unknown Mach-O architecture", 0);
   goto fail;