[gcc(refs/users/aoliva/heads/testme)] aix: FAT libraries: test native compiler mode directly

[Alexandre Oliva <aoliva@gcc.gnu.org>]

https://gcc.gnu.org/g:4f97bed9a7989e14cbb53e405fbd8b3c08aa75ec

commit 4f97bed9a7989e14cbb53e405fbd8b3c08aa75ec
Author: David Edelsohn <dje.gcc@gmail.com>
Date:   Mon Jul 13 14:43:39 2020 -0400

    aix: FAT libraries: test native compiler mode directly
    
    The FAT libraries config fragments need to know which library is native
    and which is a multilib to choose the correct multilib from which to
    append the additional object file or shared object file.  Testing the
    top-level archive is fragile because it will fail if rebuilding.  This
    patch tests the compiler preprocessing macros for the 64 bit AIX specific
    __64BIT__ to determine the native mode of the compiler in MULTILIBTOP.
    
    2020-07-14  David Edelsohn  <dje.gcc@gmail.com>
    
    libatomic/ChangeLog
    
            * config/t-aix: Set BITS from compiler cpp macro.
    
    libgcc/ChangeLog
    
            * config/rs6000/t-slibgcc-aix: Set BITS from compiler cpp macro.
    
    libgfortran/ChangeLog
    
            * config/t-aix: Set BITS from compiler cpp macro.
    
    libgomp/ChangeLog
    
            * config/t-aix: Set BITS from compiler cpp macro.
    
    libstdc++-v3/ChangeLog
    
            * config/os/aix/t-aix: Set BITS from compiler cpp macro.

Diff:
---
 libatomic/config/t-aix             | 2 +-
 libgcc/config/rs6000/t-slibgcc-aix | 2 +-
 libgfortran/config/t-aix           | 2 +-
 libgomp/config/t-aix               | 2 +-
 libstdc++-v3/config/os/aix/t-aix   | 2 +-
 5 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/libatomic/config/t-aix b/libatomic/config/t-aix
index 53c2d83242f..0f37aaa15f3 100644
--- a/libatomic/config/t-aix
+++ b/libatomic/config/t-aix
@@ -1,5 +1,5 @@
 ifeq ($(MULTIBUILDTOP),)
-BITS=$(shell if test -z "`ar -X64 t .libs/$(PACKAGE).a`" ; then \
+BITS=$(shell if test -z "`$(CC) -x c -E /dev/null -g3 -o - | grep 64BIT`" ; then \
     echo '64'; else echo '32'; fi)
 #MAJOR=$(firstword $(subst :, ,$(libtool_VERSION)))
 MAJOR=1
diff --git a/libgcc/config/rs6000/t-slibgcc-aix b/libgcc/config/rs6000/t-slibgcc-aix
index e5f8a029ff8..b3bdda6f9a8 100644
--- a/libgcc/config/rs6000/t-slibgcc-aix
+++ b/libgcc/config/rs6000/t-slibgcc-aix
@@ -90,7 +90,7 @@ AR_FLAGS_FOR_TARGET = -X32_64
 
 # Build and install AIX-style FAT libraries
 ifeq ($(MULTIBUILDTOP),)
-BITS=$(shell if test -z "`ar -X64 t libgcc_s.a`" ; then \
+BITS=$(shell if test -z "`$(CC) -x c -E /dev/null -g3 -o - | grep 64BIT`" ; then \
     echo '64'; else echo '32'; fi)
 all: all-multi
 ifeq ($(enable_shared),yes)
diff --git a/libgfortran/config/t-aix b/libgfortran/config/t-aix
index 7046aeeacc3..e661286da12 100644
--- a/libgfortran/config/t-aix
+++ b/libgfortran/config/t-aix
@@ -1,5 +1,5 @@
 ifeq ($(MULTIBUILDTOP),)
-BITS=$(shell if test -z "`ar -X64 t .libs/$(PACKAGE).a`" ; then \
+BITS=$(shell if test -z "`$(CC) -x c -E /dev/null -g3 -o - | grep 64BIT`" ; then \
     echo '64'; else echo '32'; fi)
 #MAJOR=$(firstword $(subst :, ,$(libtool_VERSION)))
 MAJOR=5
diff --git a/libgomp/config/t-aix b/libgomp/config/t-aix
index 5d0b7e0f9ae..c3bb6c0bce0 100644
--- a/libgomp/config/t-aix
+++ b/libgomp/config/t-aix
@@ -1,5 +1,5 @@
 ifeq ($(MULTIBUILDTOP),)
-BITS=$(shell if test -z "`ar -X64 t .libs/$(PACKAGE).a`" ; then \
+BITS=$(shell if test -z "`$(CC) -x c -E /dev/null -g3 -o - | grep 64BIT`" ; then \
     echo '64'; else echo '32'; fi)
 MAJOR=$(firstword $(subst :, ,$(libtool_VERSION)))
 all-local:
diff --git a/libstdc++-v3/config/os/aix/t-aix b/libstdc++-v3/config/os/aix/t-aix
index a588746dd99..a5d58fab474 100644
--- a/libstdc++-v3/config/os/aix/t-aix
+++ b/libstdc++-v3/config/os/aix/t-aix
@@ -1,5 +1,5 @@
 ifeq ($(MULTIBUILDTOP),)
-BITS=$(shell if test -z "`ar -X64 t src/.libs/$(PACKAGE).a`" ; then \
+BITS=$(shell if test -z "`$(CC) -x c -E /dev/null -g3 -o - | grep 64BIT`" ; then \
     echo '64'; else echo '32'; fi)
 MAJOR=$(firstword $(subst :, ,$(libtool_VERSION)))
 all-local: