[PATCH 4/4] linux: Make profil_counter a compat_symbol (BZ#17726)

[Adhemerval Zanella <adhemerval dot zanella at linaro dot org>]

As indicated by Joseph's comment on BZ#17726, this symbol is most
likely a historical ABI accident.  This patch make it on both arm
and sparc ABIs a compat_symbol.

Checked against a build arm-linux-gnueabihf, sparcv9-linux-gnu, adn
sparc64-linux-gnu to see if the symbol is still present.

	* gmon/Versions (libc) [GLIBC_2.31]: New entry.
	* sysdeps/unix/sysv/linux/arm/profil-counter.h (profil_counter):
	Make a compat_symbol.
	* sysdeps/unix/sysv/linux/sparc/profil-counter.h
	(__profil_counter_global): Likewise.
---
 gmon/Versions                                  | 2 ++
 sysdeps/unix/sysv/linux/arm/profil-counter.h   | 5 ++++-
 sysdeps/unix/sysv/linux/sparc/profil-counter.h | 5 ++++-
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/gmon/Versions b/gmon/Versions
index d0b63334f2..cc705bd978 100644
--- a/gmon/Versions
+++ b/gmon/Versions
@@ -19,4 +19,6 @@ libc {
   GLIBC_2.2.3 {
     sprofil;
   }
+  GLIBC_2.31 {
+  }
 }
diff --git a/sysdeps/unix/sysv/linux/arm/profil-counter.h b/sysdeps/unix/sysv/linux/arm/profil-counter.h
index 040c7aa59a..df393332e2 100644
--- a/sysdeps/unix/sysv/linux/arm/profil-counter.h
+++ b/sysdeps/unix/sysv/linux/arm/profil-counter.h
@@ -30,5 +30,8 @@ __profil_counter (int signo, siginfo_t *_si, void *scp)
   asm volatile ("");
 }
 #ifndef __profil_counter
-weak_alias (__profil_counter, profil_counter)
+# include <shlib-compat.h>
+# if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_31)
+compat_symbol (libc, __profil_counter, profil_counter, GLIBC_2_0);
+# endif
 #endif
diff --git a/sysdeps/unix/sysv/linux/sparc/profil-counter.h b/sysdeps/unix/sysv/linux/sparc/profil-counter.h
index ad06a4fe06..01271103bb 100644
--- a/sysdeps/unix/sysv/linux/sparc/profil-counter.h
+++ b/sysdeps/unix/sysv/linux/sparc/profil-counter.h
@@ -21,6 +21,8 @@
 #include <sysdeps/unix/sysv/linux/profil-counter.h>
 
 #ifndef __profil_counter
+# include <shlib-compat.h>
+# if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_31)
 void
 __profil_counter_global (int signo, struct sigcontext *si)
 {
@@ -30,5 +32,6 @@ __profil_counter_global (int signo, struct sigcontext *si)
   profil_count (si->si_regs.pc);
 #endif
 }
-weak_alias (__profil_counter_global, profil_counter)
+compat_symbol (libc, __profil_counter_global, profil_counter, GLIBC_2_0);
+# endif
 #endif
-- 
2.17.1