rs6000: Remove -mpower10 option (PR95907)

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.

2020-07-24  Segher Boessenkool  <segher@kernel.crashing.org>

	* config/rs6000/rs6000.opt: Delete -mpower10.

gcc/testsuite/
	* gcc.target/powerpc/pr95907.c: New.

diff --git a/gcc/config/rs6000/rs6000.opt b/gcc/config/rs6000/rs6000.opt
index 6b426f2aaf19c7a00ec3aa0210249a807753f756..591067539979ef788d6057a881606a58897a6b26 100644 (file)
--- 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 (file)
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) { }