[PATCH 2/2][MIPS][RFC] Emit .note.GNU-stack for hard-float linux targets.

[Dragan Mladjenovic]

From: "Dragan Mladjenovic" <dmladjenovic@wavecomp.com>

libgcc/ChangeLog:

2019-08-05  Dragan Mladjenovic  <dmladjenovic@wavecomp.com>

	* config/mips/gnustack.h: Check for TARGET_LIBC_GNUSTACK also.

gcc/ChangeLog:

2019-08-05  Dragan Mladjenovic  <dmladjenovic@wavecomp.com>

	* config.in: Regenerated.
	* config/mips/linux.h (NEED_INDICATE_EXEC_STACK): Define to 1
	for TARGET_LIBC_GNUSTACK.
	* configure: Regenerated.
	* configure.ac: Define TARGET_LIBC_GNUSTACK if glibc version is
	found 2.31 or greater.
---
 gcc/config/mips/linux.h       |  4 ++++
 gcc/configure.ac              | 12 ++++++++++++
 libgcc/config/mips/gnustack.h |  2 +-
 3 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/gcc/config/mips/linux.h b/gcc/config/mips/linux.h
index 1fa72ef..30b22e7 100644
--- a/gcc/config/mips/linux.h
+++ b/gcc/config/mips/linux.h
@@ -53,4 +53,8 @@ along with GCC; see the file COPYING3.  If not see
 
 #undef NEED_INDICATE_EXEC_STACK
 
+#ifdef TARGET_LIBC_GNUSTACK
+#define NEED_INDICATE_EXEC_STACK 1
+#else
 #define NEED_INDICATE_EXEC_STACK TARGET_SOFT_FLOAT
+#endif
diff --git a/gcc/configure.ac b/gcc/configure.ac
index c620dd2..ab080c8 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -6143,6 +6143,18 @@ if test x$gcc_cv_libc_provides_hwcap_in_tcb = xyes; then
 	    [Define if your target C Library provides the AT_HWCAP value in the TCB])
 fi
 
+# Check if the target LIBC handles PT_GNU_STACK.
+gcc_cv_libc_gnustack=unknown
+case "$target" in
+  mips*-*-linux*)
+    GCC_GLIBC_VERSION_GTE_IFELSE([2], [31], [gcc_cv_libc_gnustack=yes], )
+    ;;
+esac
+if test x$gcc_cv_libc_gnustack = xyes; then
+  AC_DEFINE(TARGET_LIBC_GNUSTACK, 1,
+            [Define if your target C Library properly handles PT_GNU_STACK])
+fi
+
 AC_MSG_CHECKING(dl_iterate_phdr in target C library)
 gcc_cv_target_dl_iterate_phdr=unknown
 case "$target" in
diff --git a/libgcc/config/mips/gnustack.h b/libgcc/config/mips/gnustack.h
index 6d5f618..a67c4b2 100644
--- a/libgcc/config/mips/gnustack.h
+++ b/libgcc/config/mips/gnustack.h
@@ -1,6 +1,6 @@
 #include "config.h"
 #if defined(__ELF__) && defined(__linux__)
-#if defined (__mips_soft_float)
+#if defined (TARGET_LIBC_GNUSTACK) || defined (__mips_soft_float)
         .section .note.GNU-stack,"",%progbits
         .previous
 #endif
-- 
1.9.1