The only way to enable or disable Power10 insns (ISA 3.1 insns) should
be via the -mcpu= switch. This patch disables the -mpower10 options the
same way the -mdirect-move switch is neutered already. That is not an
ideal way, but it works, it is not the first, and doing it properly is
more work, and will happen later.
Tested on powerpc64-linux {-m32,-m64}; committed. (Testcase is from
Peter Bergner originally; all mangling is mine).
2020-07-24 Segher Boessenkool <seg...@kernel.crashing.org>
* config/rs6000/rs6000.opt: Delete -mpower10.
gcc/testsuite/
* gcc.target/powerpc/pr95907.c: New.
---
gcc/config/rs6000/rs6000.opt | 3 +--
gcc/testsuite/gcc.target/powerpc/pr95907.c | 7 +++++++
2 files changed, 8 insertions(+), 2 deletions(-)
create mode 100644 gcc/testsuite/gcc.target/powerpc/pr95907.c
diff --git a/gcc/config/rs6000/rs6000.opt b/gcc/config/rs6000/rs6000.opt
index 6b426f2..5910675 100644
--- a/gcc/config/rs6000/rs6000.opt
+++ b/gcc/config/rs6000/rs6000.opt
@@ -568,8 +568,7 @@ mspeculate-indirect-jumps
Target Undocumented Var(rs6000_speculate_indirect_jumps) Init(1) Save
mpower10
-Target Report Mask(POWER10) Var(rs6000_isa_flags)
-Use instructions added in ISA 3.1.
+Target Undocumented Mask(POWER10) Var(rs6000_isa_flags) WarnRemoved
mprefixed
Target Report Mask(PREFIXED) Var(rs6000_isa_flags)
diff --git a/gcc/testsuite/gcc.target/powerpc/pr95907.c
b/gcc/testsuite/gcc.target/powerpc/pr95907.c
new file mode 100644
index 0000000..f2512b0
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pr95907.c
@@ -0,0 +1,7 @@
+/* PR target/95907 */
+/* { dg-do compile } */
+/* { dg-require-effective-target power10_ok } */
+/* { dg-options "-mpower10" } */
+/* { dg-warning "switch .-mpower10. is no longer supported" "" {target *-*-*}
0 } */
+
+void f(void) { }
--
1.8.3.1
