Introduce minimal MSW ARM support

wxMSW could already be compiled for ARM with MSVC, but due to not
defining any ARCH_SUFFIX for ARM, makefile.vc used to place objectsi
and libraries to the same folder as x86 objects and libraries.

A completely different question is what kind of Windows runs on 32-bit
ARM, and whether one can run regular desktop apps on it.

This commit mimics what f69dbaa1 did for ARM64, and adapts it for ARM.

Closes #24222.

.gitignore

@@ -25,45 +25,59 @@
 /build/msw/makefile.dmc
 /build/msw/*c*_msw
 /build/msw/*c*_msw_x64
+/build/msw/*c*_msw_arm
 /build/msw/*c*_msw_arm64
 /build/msw/*c*_msw[du]
 /build/msw/*c*_msw[du]_x64
+/build/msw/*c*_msw[du]_arm
 /build/msw/*c*_msw[du]_arm64
 /build/msw/*c*_mswud
 /build/msw/*c*_mswud_x64
+/build/msw/*c*_mswud_arm
 /build/msw/*c*_mswud_arm64
 /build/msw/*c*_mswdll
 /build/msw/*c*_mswdll_x64
+/build/msw/*c*_mswdll_arm
 /build/msw/*c*_mswdll_arm64
 /build/msw/*c*_msw[du]dll
 /build/msw/*c*_msw[du]dll_x64
+/build/msw/*c*_msw[du]dll_arm
 /build/msw/*c*_msw[du]dll_arm64
 /build/msw/*c*_mswuddll
 /build/msw/*c*_mswuddll_x64
+/build/msw/*c*_mswuddll_arm
 /build/msw/*c*_mswuddll_arm64
 /build/msw/*c*_mswuniv
 /build/msw/*c*_mswuniv_x64
+/build/msw/*c*_mswuniv_arm
 /build/msw/*c*_mswuniv_arm64
 /build/msw/*c*_mswuniv[du]
 /build/msw/*c*_mswuniv[du]_x64
+/build/msw/*c*_mswuniv[du]_arm
 /build/msw/*c*_mswuniv[du]_arm64
 /build/msw/*c*_mswunivud
 /build/msw/*c*_mswunivud_x64
+/build/msw/*c*_mswunivud_arm
 /build/msw/*c*_mswunivud_arm64
 /build/msw/*c*_mswunivdll
 /build/msw/*c*_mswunivdll_x64
+/build/msw/*c*_mswunivdll_arm
 /build/msw/*c*_mswunivdll_arm64
 /build/msw/*c*_mswuniv[du]dll
 /build/msw/*c*_mswuniv[du]dll_x64
+/build/msw/*c*_mswuniv[du]dll_arm
 /build/msw/*c*_mswuniv[du]dll_arm64
 /build/msw/*c*_mswunivuddll
 /build/msw/*c*_mswunivuddll_x64
+/build/msw/*c*_mswunivuddll_arm
 /build/msw/*c*_mswunivuddll_arm64
 /build/msw/*c*_mswhdll
 /build/msw/*c*_mswhdll_x64
+/build/msw/*c*_mswhdll_arm
 /build/msw/*c*_mswhdll_arm64
 /build/msw/*c*_mswuhdll
 /build/msw/*c*_mswuhdll_x64
+/build/msw/*c*_mswuhdll_arm
 /build/msw/*c*_mswuhdll_arm64
 /build/msw/wx_local.props
 
@@ -91,39 +105,51 @@
 /demos/*/*.sln
 /demos/*/*c*_msw
 /demos/*/*c*_msw_x64
+/demos/*/*c*_msw_arm
 /demos/*/*c*_msw_arm64
 /demos/*/*c*_msw[du]
 /demos/*/*c*_msw[du]_x64
+/demos/*/*c*_msw[du]_arm
 /demos/*/*c*_msw[du]_arm64
 /demos/*/*c*_mswud
 /demos/*/*c*_mswud_x64
+/demos/*/*c*_mswud_arm
 /demos/*/*c*_mswud_arm64
 /demos/*/*c*_mswdll
 /demos/*/*c*_mswdll_x64
+/demos/*/*c*_mswdll_arm
 /demos/*/*c*_mswdll_arm64
 /demos/*/*c*_msw[du]dll
 /demos/*/*c*_msw[du]dll_x64
+/demos/*/*c*_msw[du]dll_arm
 /demos/*/*c*_msw[du]dll_arm64
 /demos/*/*c*_mswuddll
 /demos/*/*c*_mswuddll_x64
+/demos/*/*c*_mswuddll_arm
 /demos/*/*c*_mswuddll_arm64
 /demos/*/*c*_mswuniv
 /demos/*/*c*_mswuniv_x64
+/demos/*/*c*_mswuniv_arm
 /demos/*/*c*_mswuniv_arm64
 /demos/*/*c*_mswuniv[du]
 /demos/*/*c*_mswuniv[du]_x64
+/demos/*/*c*_mswuniv[du]_arm
 /demos/*/*c*_mswuniv[du]_arm64
 /demos/*/*c*_mswunivud
 /demos/*/*c*_mswunivud_x64
+/demos/*/*c*_mswunivud_arm
 /demos/*/*c*_mswunivud_arm64
 /demos/*/*c*_mswunivdll
 /demos/*/*c*_mswunivdll_x64
+/demos/*/*c*_mswunivdll_arm
 /demos/*/*c*_mswunivdll_arm64
 /demos/*/*c*_mswuniv[du]dll
 /demos/*/*c*_mswuniv[du]dll_x64
+/demos/*/*c*_mswuniv[du]dll_arm
 /demos/*/*c*_mswuniv[du]dll_arm64
 /demos/*/*c*_mswunivuddll
 /demos/*/*c*_mswunivuddll_x64
+/demos/*/*c*_mswunivuddll_arm
 /demos/*/*c*_mswunivuddll_arm64
 /demos/*/*Classic?Debug*
 /demos/*/*Classic?Release*
@@ -240,39 +266,51 @@
 # /samples/
 /samples/**/*c*_msw
 /samples/**/*c*_msw_x64
+/samples/**/*c*_msw_arm
 /samples/**/*c*_msw_arm64
 /samples/**/*c*_msw[du]
 /samples/**/*c*_msw[du]_x64
+/samples/**/*c*_msw[du]_arm
 /samples/**/*c*_msw[du]_arm64
 /samples/**/*c*_mswud
 /samples/**/*c*_mswud_x64
+/samples/**/*c*_mswud_arm
 /samples/**/*c*_mswud_arm64
 /samples/**/*c*_mswdll
 /samples/**/*c*_mswdll_x64
+/samples/**/*c*_mswdll_arm
 /samples/**/*c*_mswdll_arm64
 /samples/**/*c*_msw[du]dll
 /samples/**/*c*_msw[du]dll_x64
+/samples/**/*c*_msw[du]dll_arm
 /samples/**/*c*_msw[du]dll_arm64
 /samples/**/*c*_mswuddll
 /samples/**/*c*_mswuddll_x64
+/samples/**/*c*_mswuddll_arm
 /samples/**/*c*_mswuddll_arm64
 /samples/**/*c*_mswuniv
 /samples/**/*c*_mswuniv_x64
+/samples/**/*c*_mswuniv_arm
 /samples/**/*c*_mswuniv_arm64
 /samples/**/*c*_mswuniv[du]
 /samples/**/*c*_mswuniv[du]_x64
+/samples/**/*c*_mswuniv[du]_arm
 /samples/**/*c*_mswuniv[du]_arm64
 /samples/**/*c*_mswunivud
 /samples/**/*c*_mswunivud_x64
+/samples/**/*c*_mswunivud_arm
 /samples/**/*c*_mswunivud_arm64
 /samples/**/*c*_mswunivdll
 /samples/**/*c*_mswunivdll_x64
+/samples/**/*c*_mswunivdll_arm
 /samples/**/*c*_mswunivdll_arm64
 /samples/**/*c*_mswuniv[du]dll
 /samples/**/*c*_mswuniv[du]dll_x64
+/samples/**/*c*_mswuniv[du]dll_arm
 /samples/**/*c*_mswuniv[du]dll_arm64
 /samples/**/*c*_mswunivuddll
 /samples/**/*c*_mswunivuddll_x64
+/samples/**/*c*_mswunivuddll_arm
 /samples/**/*c*_mswunivuddll_arm64
 
 # /samples/image/
@@ -326,39 +364,51 @@
 # /tests/
 /tests/*c*_msw
 /tests/*c*_msw_x64
+/tests/*c*_msw_arm
 /tests/*c*_msw_arm64
 /tests/*c*_msw[du]
 /tests/*c*_msw[du]_x64
+/tests/*c*_msw[du]_arm
 /tests/*c*_msw[du]_arm64
 /tests/*c*_mswud
 /tests/*c*_mswud_x64
+/tests/*c*_mswud_arm
 /tests/*c*_mswud_arm64
 /tests/*c*_mswdll
 /tests/*c*_mswdll_x64
+/tests/*c*_mswdll_arm
 /tests/*c*_mswdll_arm64
 /tests/*c*_msw[du]dll
 /tests/*c*_msw[du]dll_x64
+/tests/*c*_msw[du]dll_arm
 /tests/*c*_msw[du]dll_arm64
 /tests/*c*_mswuddll
 /tests/*c*_mswuddll_x64
+/tests/*c*_mswuddll_arm
 /tests/*c*_mswuddll_arm64
 /tests/*c*_mswuniv
 /tests/*c*_mswuniv_x64
+/tests/*c*_mswuniv_arm
 /tests/*c*_mswuniv_arm64
 /tests/*c*_mswuniv[du]
 /tests/*c*_mswuniv[du]_x64
+/tests/*c*_mswuniv[du]_arm
 /tests/*c*_mswuniv[du]_arm64
 /tests/*c*_mswunivud
 /tests/*c*_mswunivud_x64
+/tests/*c*_mswunivud_arm
 /tests/*c*_mswunivud_arm64
 /tests/*c*_mswunivdll
 /tests/*c*_mswunivdll_x64
+/tests/*c*_mswunivdll_arm
 /tests/*c*_mswunivdll_arm64
 /tests/*c*_mswuniv[du]dll
 /tests/*c*_mswuniv[du]dll_x64
+/tests/*c*_mswuniv[du]dll_arm
 /tests/*c*_mswuniv[du]dll_arm64
 /tests/*c*_mswunivuddll
 /tests/*c*_mswunivuddll_x64
+/tests/*c*_mswunivuddll_arm
 /tests/*c*_mswunivuddll_arm64
 /tests/test.opt
 /tests/test*.dsw
@@ -372,15 +422,19 @@
 # /utils/
 /utils/**/*c*_mswu
 /utils/**/*c*_mswu_x64
+/utils/**/*c*_mswu_arm
 /utils/**/*c*_mswu_arm64
 /utils/**/*c*_mswud
 /utils/**/*c*_mswud_x64
+/utils/**/*c*_mswud_arm
 /utils/**/*c*_mswud_arm64
 /utils/**/*c*_mswudll
 /utils/**/*c*_mswudll_x64
+/utils/**/*c*_mswudll_arm
 /utils/**/*c*_mswudll_arm64
 /utils/**/*c*_mswuddll
 /utils/**/*c*_mswuddll_x64
+/utils/**/*c*_mswuddll_arm
 /utils/**/*c*_mswuddll_arm64
 
 # /utils/emulator/src/

build/bakefiles/common.bkl

@@ -37,6 +37,8 @@
         <if cond="FORMAT=='msvs2008prj' and MSVS_PLATFORM=='win64'">_x64</if>
         <if cond="TARGET_CPU=='amd64'">_x64</if>
         <if cond="TARGET_CPU=='AMD64'">_x64</if>
+        <if cond="TARGET_CPU=='arm'">_arm</if>
+        <if cond="TARGET_CPU=='ARM'">_arm</if>
         <if cond="TARGET_CPU=='arm64'">_arm64</if>
         <if cond="TARGET_CPU=='ARM64'">_arm64</if>
         <if cond="TARGET_CPU=='ia64'">_ia64</if>
@@ -315,6 +317,8 @@
     <set var="LINK_TARGET_CPU">
         <if cond="TARGET_CPU=='amd64'">/MACHINE:X64</if>
         <if cond="TARGET_CPU=='AMD64'">/MACHINE:X64</if>
+        <if cond="TARGET_CPU=='arm'">/MACHINE:ARM</if>
+        <if cond="TARGET_CPU=='ARM'">/MACHINE:ARM</if>
         <if cond="TARGET_CPU=='arm64'">/MACHINE:ARM64</if>
         <if cond="TARGET_CPU=='ARM64'">/MACHINE:ARM64</if>
         <if cond="TARGET_CPU=='ia64'">/MACHINE:IA64</if>

build/bakefiles/config.bkl

@@ -111,7 +111,7 @@ your environment is set up appropriately with the correct compiler in the
 PATH. Rather it affects some options passed to some of the common build
 utilities such as the resource compiler and the linker.
 
-Accepted values: IA64, X64, ARM64
+Accepted values: IA64, X64, ARM, ARM64
 (AMD64 accepted as synonym for X64 but should not be used any more).
             </description>
         </option>

build/cmake/init.cmake

@@ -135,12 +135,16 @@ set(wxPLATFORM_ARCH)
 if(CMAKE_GENERATOR_PLATFORM)
     if (CMAKE_GENERATOR_PLATFORM STREQUAL "x64")
         set(wxPLATFORM_ARCH "x64")
+    elseif(CMAKE_GENERATOR_PLATFORM STREQUAL "ARM")
+        set(wxPLATFORM_ARCH "arm")
     elseif(CMAKE_GENERATOR_PLATFORM STREQUAL "ARM64")
         set(wxPLATFORM_ARCH "arm64")
     endif()
 elseif(CMAKE_VS_PLATFORM_NAME)
     if (CMAKE_VS_PLATFORM_NAME STREQUAL "x64")
         set(wxPLATFORM_ARCH "x64")
+    elseif(CMAKE_VS_PLATFORM_NAME STREQUAL "ARM")
+        set(wxPLATFORM_ARCH "arm")
     elseif(CMAKE_VS_PLATFORM_NAME STREQUAL "ARM64")
         set(wxPLATFORM_ARCH "arm64")
     endif()

build/msw/config.vc

@@ -49,7 +49,7 @@ BUILD = debug
 # PATH. Rather it affects some options passed to some of the common build
 # utilities such as the resource compiler and the linker.
 # 
-# Accepted values: IA64, X64, ARM64
+# Accepted values: IA64, X64, ARM, ARM64
 # (AMD64 accepted as synonym for X64 but should not be used any more). 
 TARGET_CPU = $(CPU)
 

build/msw/makefile.vc

@@ -1873,6 +1873,9 @@ BUILD_CFG_FILE = $(SETUPHDIR)\build.cfg
 !if "$(TARGET_CPU)" == "AMD64"
 ARCH_SUFFIX = _x64
 !endif
+!if "$(TARGET_CPU)" == "ARM"
+ARCH_SUFFIX = _arm
+!endif
 !if "$(TARGET_CPU)" == "ARM64"
 ARCH_SUFFIX = _arm64
 !endif
@@ -1891,6 +1894,9 @@ ARCH_SUFFIX = _x64
 !if "$(TARGET_CPU)" == "amd64"
 ARCH_SUFFIX = _x64
 !endif
+!if "$(TARGET_CPU)" == "arm"
+ARCH_SUFFIX = _arm
+!endif
 !if "$(TARGET_CPU)" == "arm64"
 ARCH_SUFFIX = _arm64
 !endif
@@ -1942,6 +1948,9 @@ LIBTYPE_SUFFIX = dll
 !if "$(TARGET_CPU)" == "AMD64"
 LINK_TARGET_CPU = /MACHINE:X64
 !endif
+!if "$(TARGET_CPU)" == "ARM"
+LINK_TARGET_CPU = /MACHINE:ARM
+!endif
 !if "$(TARGET_CPU)" == "ARM64"
 LINK_TARGET_CPU = /MACHINE:ARM64
 !endif
@@ -1960,6 +1969,9 @@ LINK_TARGET_CPU = /MACHINE:X64
 !if "$(TARGET_CPU)" == "amd64"
 LINK_TARGET_CPU = /MACHINE:X64
 !endif
+!if "$(TARGET_CPU)" == "arm"
+LINK_TARGET_CPU = /MACHINE:ARM
+!endif
 !if "$(TARGET_CPU)" == "arm64"
 LINK_TARGET_CPU = /MACHINE:ARM64
 !endif

build/msw/wx_setup.props

@@ -29,6 +29,9 @@
   <PropertyGroup Label="UserMacros" Condition="'$(Platform)'=='x64'">
     <wxArchSuffix>_x64</wxArchSuffix>
   </PropertyGroup>
+  <PropertyGroup Label="UserMacros" Condition="'$(Platform)'=='ARM'">
+    <wxArchSuffix>_arm</wxArchSuffix>
+  </PropertyGroup>
   <PropertyGroup Label="UserMacros" Condition="'$(Platform)'=='ARM64'">
     <wxArchSuffix>_arm64</wxArchSuffix>
   </PropertyGroup>

docs/msw/install.md

@@ -367,7 +367,7 @@ The full list of the build settings follows:
   usable .pdb files with debug information) and this setting makes it
   possible.
 
-* `TARGET_CPU=X64|ARM64|IA64`
+* `TARGET_CPU=X64|ARM|ARM64|IA64`
 
   (VC++ only.) Set this variable to build for x86_64 systems. If unset, x86
   build is performed.

include/msvc/wx/setup.h

@@ -76,6 +76,8 @@
 // architecture-specific part: not used (again, for compatibility), for x86
 #if defined(_M_X64)
     #define wxARCH_SUFFIX _x64
+#elif defined(_M_ARM)
+    #define wxARCH_SUFFIX _arm
 #elif defined(_M_ARM64)
     #define wxARCH_SUFFIX _arm64
 #elif defined(_M_IA64)

src/msw/stackwalk.cpp

@@ -230,6 +230,16 @@ void wxStackWalker::WalkFrom(const CONTEXT *pCtx, size_t skip, size_t maxDepth)
     sf.AddrFrame.Mode      = AddrModeFlat;
 
     dwMachineType = IMAGE_FILE_MACHINE_AMD64;
+#elif defined(_M_ARM)
+    // TODO: Verify this code on ARM
+    sf.AddrPC.Offset       = ctx.Pc;
+    sf.AddrPC.Mode         = AddrModeFlat;
+    sf.AddrStack.Offset    = ctx.Sp;
+    sf.AddrStack.Mode      = AddrModeFlat;
+    sf.AddrFrame.Offset    = ctx.R11;
+    sf.AddrFrame.Mode      = AddrModeFlat;
+
+    dwMachineType = IMAGE_FILE_MACHINE_ARM;
 #elif defined(_M_ARM64)
     // TODO: Verify this code once Windows 10 for ARM64 is commercially available
     sf.AddrPC.Offset       = ctx.Pc;
@@ -332,7 +342,7 @@ void wxStackWalker::Walk(size_t skip, size_t maxDepth)
     // Software License.
 
     CONTEXT ctx;
-#ifdef __WIN64__
+#if defined(__WIN64__) || defined(_M_ARM)
     RtlCaptureContext(&ctx);
 #else // Win32
     // RtlCaptureContext() is not implemented correctly for x86 and can even

src/msw/stdpaths.cpp

@@ -261,6 +261,7 @@ void wxStandardPaths::IgnoreAppBuildSubDirs()
 #else // __WIN32__
     IgnoreAppSubDir("Win32");
     IgnoreAppSubDir("x86");
+    IgnoreAppSubDir("ARM");
 #endif // __WIN64__/__WIN32__
 
     wxString compilerPrefix;