ILP32 was originally intended to make porting to AArch64 easier.  Support was
never merged in the Linux kernel or GLIBC, so it has been unsupported for many
years.  There isn't a benefit in keeping unsupported features forever, so
deprecate it now (and it could be removed in a future release).

Passes regress & bootstrap, OK for commit?

gcc:
        * config/aarch64/aarch64.cc (aarch64_override_options): Add warning.
        * doc/invoke.texi: Document -mabi=ilp32 as deprecated.

gcc/testsuite:
        * gcc.target/aarch64/inline-mem-set-pr112804.c: Add -Wno-deprecated.    
        * gcc.target/aarch64/pr100518.c: Likewise.
        * gcc.target/aarch64/pr113114.c: Likewise.
        * gcc.target/aarch64/pr80295.c: Likewise.
        * gcc.target/aarch64/pr94201.c: Likewise.
        * gcc.target/aarch64/pr94577.c: Likewise.
        * gcc.target/aarch64/sve/pr108603.c: Likewise.

---

diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc
index 
78d2cc4bbe4933c79153d0741bfd8d7b076952d0..02891b0a8ed75eb596df9d0dbff77ccd6a625f11
 100644
--- a/gcc/config/aarch64/aarch64.cc
+++ b/gcc/config/aarch64/aarch64.cc
@@ -19315,6 +19315,8 @@ aarch64_override_options (void)
   if (TARGET_ILP32)
     error ("assembler does not support %<-mabi=ilp32%>");
 #endif
+  if (TARGET_ILP32)
+    warning (OPT_Wdeprecated, "%<-mabi=ilp32%> is deprecated.");
 
   /* Convert -msve-vector-bits to a VG count.  */
   aarch64_sve_vg = aarch64_convert_sve_vector_bits (aarch64_sve_vector_bits);
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 
17fe2c64c1f85ad8db8b61f040aafe5f8212e488..6722ad5281541e499d5b3916179d9a4d1b39097f
 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -21472,6 +21472,8 @@ The default depends on the specific target 
configuration.  Note that
 the LP64 and ILP32 ABIs are not link-compatible; you must compile your
 entire program with the same ABI, and link with a compatible set of libraries.
 
+@samp{ilp32} is deprecated.
+
 @opindex mbig-endian
 @item -mbig-endian
 Generate big-endian code.  This is the default when GCC is configured for an
diff --git a/gcc/testsuite/gcc.target/aarch64/inline-mem-set-pr112804.c 
b/gcc/testsuite/gcc.target/aarch64/inline-mem-set-pr112804.c
index 
fe8414559864db4a8584fd3f5a7145b5e3d1f322..276c10cd0e86ff2c74a5c09ce70f7d76614978ec
 100644
--- a/gcc/testsuite/gcc.target/aarch64/inline-mem-set-pr112804.c
+++ b/gcc/testsuite/gcc.target/aarch64/inline-mem-set-pr112804.c
@@ -1,5 +1,5 @@
 /* { dg-do compile } */
-/* { dg-options "-finline-stringops -mabi=ilp32 -ftrivial-auto-var-init=zero" 
} */
+/* { dg-options "-finline-stringops -mabi=ilp32 -Wno-deprecated 
-ftrivial-auto-var-init=zero" } */
 
 short m(unsigned k) {
   const unsigned short *n[65];
diff --git a/gcc/testsuite/gcc.target/aarch64/pr100518.c 
b/gcc/testsuite/gcc.target/aarch64/pr100518.c
index 
5ca599f5d2e0e1603456b2eaf2e98866871faad1..177991cfb2289530e4ee3e3633fddde5972e9e28
 100644
--- a/gcc/testsuite/gcc.target/aarch64/pr100518.c
+++ b/gcc/testsuite/gcc.target/aarch64/pr100518.c
@@ -1,5 +1,5 @@
 /* { dg-do compile } */
-/* { dg-options "-mabi=ilp32 -mstrict-align -O2" } */
+/* { dg-options "-mabi=ilp32 -Wno-deprecated -mstrict-align -O2" } */
 
 int unsigned_range_min, unsigned_range_max, a11___trans_tmp_1;
 
diff --git a/gcc/testsuite/gcc.target/aarch64/pr113114.c 
b/gcc/testsuite/gcc.target/aarch64/pr113114.c
index 
5b0383c24359ad95c7d333a6f18b98e50383f71b..976e2db71bfafe96e3729e4d4bc333874d98c084
 100644
--- a/gcc/testsuite/gcc.target/aarch64/pr113114.c
+++ b/gcc/testsuite/gcc.target/aarch64/pr113114.c
@@ -1,5 +1,5 @@
 /* { dg-do compile } */
-/* { dg-options "-mabi=ilp32 -O -mearly-ldp-fusion -mlate-ldp-fusion" } */
+/* { dg-options "-mabi=ilp32 -Wno-deprecated -O -mearly-ldp-fusion 
-mlate-ldp-fusion" } */
 void foo_n(double *a) {
   int i = 1;
   for (; i < (int)foo_n; i++)
diff --git a/gcc/testsuite/gcc.target/aarch64/pr80295.c 
b/gcc/testsuite/gcc.target/aarch64/pr80295.c
index 
b3866d8d6a9e5688f0eedb2fd7504547c412afa2..c79427517d0e61417dd5c0013f8db04ed91da449
 100644
--- a/gcc/testsuite/gcc.target/aarch64/pr80295.c
+++ b/gcc/testsuite/gcc.target/aarch64/pr80295.c
@@ -1,5 +1,5 @@
 /* { dg-do compile } */
-/* { dg-options "-mabi=ilp32" } */
+/* { dg-options "-mabi=ilp32 -Wno-deprecated" } */
 
 void f (void *b) 
 { 
diff --git a/gcc/testsuite/gcc.target/aarch64/pr94201.c 
b/gcc/testsuite/gcc.target/aarch64/pr94201.c
index 
3b9b79059e02b21c652726abb86d124274b6547c..cd21f7c06690219410a78eb824fd140627df3354
 100644
--- a/gcc/testsuite/gcc.target/aarch64/pr94201.c
+++ b/gcc/testsuite/gcc.target/aarch64/pr94201.c
@@ -1,5 +1,5 @@
 /* { dg-do compile } */
-/* { dg-options "-mcmodel=tiny -mabi=ilp32 -fPIC" } */
+/* { dg-options "-mcmodel=tiny -mabi=ilp32 -Wno-deprecated -fPIC" } */
 /* { dg-require-effective-target fpic } */
 
 extern int bar (void *);
diff --git a/gcc/testsuite/gcc.target/aarch64/pr94577.c 
b/gcc/testsuite/gcc.target/aarch64/pr94577.c
index 
d51799fb0bb67999ed1374e2d65a2b0d353b310a..49cb6e10aa5ddbbf35a3ba331afddfb6679a8092
 100644
--- a/gcc/testsuite/gcc.target/aarch64/pr94577.c
+++ b/gcc/testsuite/gcc.target/aarch64/pr94577.c
@@ -1,5 +1,5 @@
 /* { dg-do compile } */
-/* { dg-options "-mcmodel=large -mabi=ilp32 -fno-pie" } */
+/* { dg-options "-mcmodel=large -mabi=ilp32 -Wno-deprecated -fno-pie" } */
 
 void
 foo ()
diff --git a/gcc/testsuite/gcc.target/aarch64/sve/pr108603.c 
b/gcc/testsuite/gcc.target/aarch64/sve/pr108603.c
index 
a2aea9f0b12bfa9a491e32577140e28f89c3392d..18aa4cfe7f72f6767919b1612568b6164e4f3b7d
 100644
--- a/gcc/testsuite/gcc.target/aarch64/sve/pr108603.c
+++ b/gcc/testsuite/gcc.target/aarch64/sve/pr108603.c
@@ -1,4 +1,4 @@
-/* { dg-options "-O2 -mabi=ilp32 -fdata-sections" } */
+/* { dg-options "-O2 -mabi=ilp32 -Wno-deprecated -fdata-sections" } */
 
 int a[128];
 long long *p;

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