Add -miamcu command line option

-miamcu tells GCC to generate code that conforms to Intel MCU psABI.

	* config/i386/i386.opt: Add -miamcu.
	* doc/invoke.texi: Document -miamcu.

2 files changed, 10 insertions, 1 deletions

diff --git a/gcc/config/i386/i386.opt b/gcc/config/i386/i386.opt
index 0f463a23820..6759a8c06c5 100644
--- a/gcc/config/i386/i386.opt
+++ b/gcc/config/i386/i386.opt
@@ -493,6 +493,10 @@ Clear all tune features
 mdump-tune-features
 Target RejectNegative Var(ix86_dump_tunes) Init(0)
 
+miamcu
+Target Report Mask(IAMCU)
+Generate code that conforms to Intel MCU psABI
+
 mabi=
 Target RejectNegative Joined Var(ix86_abi) Enum(calling_abi) Init(SYSV_ABI)
 Generate code that conforms to the given ABI
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 720736f6b47..ced76a2a323 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -682,7 +682,7 @@ Objective-C and Objective-C++ Dialects}.
 -mpc32 -mpc64 -mpc80 -mstackrealign @gol
 -momit-leaf-frame-pointer  -mno-red-zone -mno-tls-direct-seg-refs @gol
 -mcmodel=@var{code-model} -mabi=@var{name} -maddress-mode=@var{mode} @gol
--m32 -m64 -mx32 -m16 -mlarge-data-threshold=@var{num} @gol
+-m32 -m64 -mx32 -m16 -miamcu -mlarge-data-threshold=@var{num} @gol
 -msse2avx -mfentry -m8bit-idiv @gol
 -mavx256-split-unaligned-load -mavx256-split-unaligned-store @gol
 -mstack-protector-guard=@var{guard}}
@@ -15722,10 +15722,12 @@ on x86-64 processors in 64-bit environments.
 @itemx -m64
 @itemx -mx32
 @itemx -m16
+@itemx -miamcu
 @opindex m32
 @opindex m64
 @opindex mx32
 @opindex m16
+@opindex miamcu
 Generate code for a 16-bit, 32-bit or 64-bit environment.
 The @option{-m32} option sets @code{int}, @code{long}, and pointer types
 to 32 bits, and
@@ -15744,6 +15746,9 @@ The @option{-m16} option is the same as @option{-m32}, except for that
 it outputs the @code{.code16gcc} assembly directive at the beginning of
 the assembly output so that the binary can run in 16-bit mode.
 
+The @option{-miamcu} option generates code which conforms to Intel MCU
+psABI.  It requires the @option{-m32} option to be turned on.
+
 @item -mno-red-zone
 @opindex mno-red-zone
 Do not use a so-called ``red zone'' for x86-64 code.  The red zone is mandated