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driver: Also prune joined switches with negation 

When -march=native is passed to host_detect_local_cpu to the backend,
it overrides all command lines after it.  That means

$ gcc -march=native -march=armv8-a

is treated as

$ gcc -march=armv8-a -march=native

Prune joined switches with Negative and RejectNegative to allow
-march=armv8-a to override previous -march=native on command-line.

This is the same fix as was applied for i386 in SVN revision 269164 but for
aarch64 and arm.

2019-09-26  Matt Turner  <mattst88@gmail.com>

	PR driver/69471
	* config/aarch64/aarch64.opt (march=): Add Negative(march=).
	(mtune=): Add Negative(mtune=).
	(mcpu=): Add Negative(mcpu=).
	* config/arm/arm.opt: Likewise.

From-SVN: r276148
This commit is contained in:
Matt Turner 2019-09-26 10:52:42 +00:00 committed by Kyrylo Tkachov
parent 2b5b5e2414
commit 6fdbe41963
3 changed files with 14 additions and 6 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2019-09-26 Matt Turner <mattst88@gmail.com>
PR driver/69471
* config/aarch64/aarch64.opt (march=): Add Negative(march=).
(mtune=): Add Negative(mtune=).
(mcpu=): Add Negative(mcpu=).
* config/arm/arm.opt: Likewise.
2019-09-26 Kyrylo Tkachov <kyrylo.tkachov@arm.com>
* config/arm/arm.md (arm_<simd32_op>): New define_insn.

6
gcc/config/aarch64/aarch64.opt
View File

@ -119,15 +119,15 @@ EnumValue
Enum(aarch64_tls_size) String(48) Value(48)
march=
Target RejectNegative ToLower Joined Var(aarch64_arch_string)
Target RejectNegative Negative(march=) ToLower Joined Var(aarch64_arch_string)
Use features of architecture ARCH.
mcpu=
Target RejectNegative ToLower Joined Var(aarch64_cpu_string)
Target RejectNegative Negative(mcpu=) ToLower Joined Var(aarch64_cpu_string)
Use features of and optimize for CPU.
mtune=
Target RejectNegative ToLower Joined Var(aarch64_tune_string)
Target RejectNegative Negative(mtune=) ToLower Joined Var(aarch64_tune_string)
Optimize for CPU.
mabi=

6
gcc/config/arm/arm.opt
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@ -82,7 +82,7 @@ mapcs-stack-check
Target Report Mask(APCS_STACK) Undocumented
march=
Target RejectNegative ToLower Joined Var(arm_arch_string)
Target RejectNegative Negative(march=) ToLower Joined Var(arm_arch_string)
Specify the name of the target architecture.
; Other arm_arch values are loaded from arm-tables.opt
@ -107,7 +107,7 @@ Target Report Mask(CALLER_INTERWORKING)
Thumb: Assume function pointers may go to non-Thumb aware code.
mcpu=
Target RejectNegative ToLower Joined Var(arm_cpu_string)
Target RejectNegative Negative(mcpu=) ToLower Joined Var(arm_cpu_string)
Specify the name of the target CPU.
mfloat-abi=
@ -232,7 +232,7 @@ Target Report Mask(TPCS_LEAF_FRAME)
Thumb: Generate (leaf) stack frames even if not needed.
mtune=
Target RejectNegative ToLower Joined Var(arm_tune_string)
Target RejectNegative Negative(mtune=) ToLower Joined Var(arm_tune_string)
Tune code for the given processor.
mprint-tune-info