[Bug 49270] New: armv7l mingw build broken

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=49270

Bug ID: 49270
           Summary: armv7l mingw build broken
           Product: Wine
           Version: 5.9
          Hardware: arm
                OS: Linux
            Status: NEW
          Keywords: download, source
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: Debian

Building on armv7 (assuming toolchain targets armv7, not armv6k, see bug 49191)
without mingw works.

If mingw is used (I used llvm-mingw), configure picks it up fine. There are a
lot of warnings:
"warning: 'pcs' calling convention is not supported for this target
[-Wignored-attributes]"

but the build itself seems to (mostly) work. If the patch for bug 49179 is
applied, winetest.exe will run on windows surface rt.

However, there are two (related) build failures, in

dlls/rpcrt4/ndr_stubless.cross.o:
armv7-w64-mingw32-clang -c -o ndr_stubless.cross.o ndr_stubless.c -I.
-I../../include -I../../include/msvcrt -D__WINESRC__ \
  -D_RPCRT4_ -DMSWMSG -D_UCRT -DWINE_CROSS_PE -Wall -target armv7-w64-mingw32
-fno-strict-aliasing \
  -Wdeclaration-after-statement -Wempty-body -Wignored-qualifiers
-Wno-pragma-pack \
  -Wstrict-prototypes -Wtype-limits -Wvla -Wwrite-strings -Wpointer-arith \
  -Wno-incompatible-library-redeclaration -Wno-ignored-attributes
<inline asm>:6:2: error: target does not support ARM mode
        .arm
        ^
<inline asm>:15:2: error: predicated instructions must be in IT block
        subeq SP, SP, #4
        ^
2 errors generated.

and dlls/vcomp/main.cross.o:
armv7-w64-mingw32-clang -c -o main.cross.o main.c -I. -I../../include
-I../../include/msvcrt -D__WINESRC__ -D_UCRT \
  -DWINE_CROSS_PE -Wall -target armv7-w64-mingw32 -fno-strict-aliasing
-Wdeclaration-after-statement \
  -Wempty-body -Wignored-qualifiers -Wno-pragma-pack -Wstrict-prototypes
-Wtype-limits -Wvla \
  -Wwrite-strings -Wpointer-arith -Wno-incompatible-library-redeclaration
-Wno-ignored-attributes
<inline asm>:6:2: error: target does not support ARM mode
        .arm
        ^
<inline asm>:15:2: error: predicated instructions must be in IT block
        subeq SP, SP, #4
        ^
2 errors generated.
> From some quick searching, it looks like we may need to either change the

target, or use thumb2 assembly instead.