[meta-oe][PATCH 1/2] abseil-cpp: Fix build on musl and ppc64

["Khem Raj" <raj.khem@gmail.com>]

Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
 .../abseil-cpp/abseil-ppc-fixes.patch         | 94 +++++++++++++++++++
 .../abseil-cpp/abseil-cpp_git.bb              |  1 +
 2 files changed, 95 insertions(+)
 create mode 100644 meta-oe/recipes-devtools/abseil-cpp/abseil-cpp/abseil-ppc-fixes.patch

diff --git a/meta-oe/recipes-devtools/abseil-cpp/abseil-cpp/abseil-ppc-fixes.patch b/meta-oe/recipes-devtools/abseil-cpp/abseil-cpp/abseil-ppc-fixes.patch
new file mode 100644
index 0000000000..ee0c25473b
--- /dev/null
+++ b/meta-oe/recipes-devtools/abseil-cpp/abseil-cpp/abseil-ppc-fixes.patch
@@ -0,0 +1,94 @@
+An all-in-one patch that fixes several issues:
+
+1) UnscaledCycleClock not fully implemented for ppc*-musl (disabled on musl)
+2) powerpc stacktrace implementation only works on glibc (disabled on musl)
+3) powerpc stacktrace implementation has ppc64 assumptions (fixed)
+4) examine_stack.cpp makes glibc assumptions on powerpc (fixed)
+
+Sourced from void linux
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+
+--- a/absl/base/internal/unscaledcycleclock.cc
++++ b/absl/base/internal/unscaledcycleclock.cc
+@@ -20,7 +20,7 @@
+ #include <intrin.h>
+ #endif
+ 
+-#if defined(__powerpc__) || defined(__ppc__)
++#if (defined(__powerpc__) || defined(__ppc__)) && defined(__GLIBC__)
+ #ifdef __GLIBC__
+ #include <sys/platform/ppc.h>
+ #elif defined(__FreeBSD__)
+@@ -59,7 +59,7 @@ double UnscaledCycleClock::Frequency() {
+   return base_internal::NominalCPUFrequency();
+ }
+ 
+-#elif defined(__powerpc__) || defined(__ppc__)
++#elif (defined(__powerpc__) || defined(__ppc__)) && defined(__GLIBC__)
+ 
+ int64_t UnscaledCycleClock::Now() {
+ #ifdef __GLIBC__
+--- a/absl/base/internal/unscaledcycleclock.h
++++ b/absl/base/internal/unscaledcycleclock.h
+@@ -46,7 +46,7 @@
+ 
+ // The following platforms have an implementation of a hardware counter.
+ #if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__) || \
+-  defined(__powerpc__) || defined(__ppc__) || \
++  ((defined(__powerpc__) || defined(__ppc__)) && defined(__GLIBC__)) || \
+   defined(_M_IX86) || defined(_M_X64)
+ #define ABSL_HAVE_UNSCALED_CYCLECLOCK_IMPLEMENTATION 1
+ #else
+--- a/absl/debugging/internal/examine_stack.cc
++++ b/absl/debugging/internal/examine_stack.cc
+@@ -27,6 +27,10 @@
+ #include <csignal>
+ #include <cstdio>
+ 
++#if defined(__powerpc__)
++#include <asm/ptrace.h>
++#endif
++
+ #include "absl/base/attributes.h"
+ #include "absl/base/internal/raw_logging.h"
+ #include "absl/base/macros.h"
+@@ -55,8 +59,10 @@ void* GetProgramCounter(void* vuc) {
+     return reinterpret_cast<void*>(context->uc_mcontext.pc);
+ #elif defined(__powerpc64__)
+     return reinterpret_cast<void*>(context->uc_mcontext.gp_regs[32]);
+-#elif defined(__powerpc__)
++#elif defined(__powerpc__) && defined(__GLIBC__)
+     return reinterpret_cast<void*>(context->uc_mcontext.regs->nip);
++#elif defined(__powerpc__)
++    return reinterpret_cast<void*>(((struct pt_regs *)context->uc_regs)->nip);
+ #elif defined(__riscv)
+     return reinterpret_cast<void*>(context->uc_mcontext.__gregs[REG_PC]);
+ #elif defined(__s390__) && !defined(__s390x__)
+--- a/absl/debugging/internal/stacktrace_config.h
++++ b/absl/debugging/internal/stacktrace_config.h
+@@ -64,7 +64,7 @@
+ #elif defined(__i386__) || defined(__x86_64__)
+ #define ABSL_STACKTRACE_INL_HEADER \
+   "absl/debugging/internal/stacktrace_x86-inl.inc"
+-#elif defined(__ppc__) || defined(__PPC__)
++#elif (defined(__ppc__) || defined(__PPC__)) && defined(__GLIBC__)
+ #define ABSL_STACKTRACE_INL_HEADER \
+   "absl/debugging/internal/stacktrace_powerpc-inl.inc"
+ #elif defined(__aarch64__)
+--- a/absl/debugging/internal/stacktrace_powerpc-inl.inc
++++ b/absl/debugging/internal/stacktrace_powerpc-inl.inc
+@@ -130,8 +130,13 @@ static void **NextStackFrame(void **old_
+         StacktracePowerPCGetLR(new_sp) == kernel_sigtramp_rt64_address) {
+       const ucontext_t* signal_context =
+           reinterpret_cast<const ucontext_t*>(uc);
++#if defined(__powerpc64__)
+       void **const sp_before_signal =
+           reinterpret_cast<void**>(signal_context->uc_mcontext.gp_regs[PT_R1]);
++#else
++      void **const sp_before_signal =
++          reinterpret_cast<void**>(signal_context->uc_mcontext.uc_regs->gregs[PT_R1]);
++#endif
+       // Check that alleged sp before signal is nonnull and is reasonably
+       // aligned.
+       if (sp_before_signal != nullptr &&
diff --git a/meta-oe/recipes-devtools/abseil-cpp/abseil-cpp_git.bb b/meta-oe/recipes-devtools/abseil-cpp/abseil-cpp_git.bb
index 6a1a029566..b944b3c15e 100644
--- a/meta-oe/recipes-devtools/abseil-cpp/abseil-cpp_git.bb
+++ b/meta-oe/recipes-devtools/abseil-cpp/abseil-cpp_git.bb
@@ -13,6 +13,7 @@ BRANCH = "lts_2020_09_23"
 SRC_URI = "git://github.com/abseil/abseil-cpp;branch=${BRANCH}         \
            file://0001-absl-always-use-asm-sgidefs.h.patch             \
            file://0002-Remove-maes-option-from-cross-compilation.patch \
+           file://file://abseil-ppc-fixes.patch \
           "
 
 S = "${WORKDIR}/git"
-- 
2.30.2