Improve Windows build support.

- Use multithreading (works with a sufficiently recent version of
  the Microsoft developer tools / C SDK).
- Detect CPU architecture and use AVX2 or NEON when appropriate.
- Automatically detect python installation path.

1 files changed, 19 insertions, 7 deletions

diff --git a/build.bat b/build.bat
index 909ff01..9f9f5f1 100644
--- a/build.bat
+++ b/build.bat
@@ -9,15 +9,25 @@ if [%1]==[/d] (
 

 SET CC=clang

 SET CXX=clang++

-SET ARCH=PORTABLE

-SET THREADS=1

+SET THREADS=16

 SET SANITIZE=

 

-:: TODO depends on ARCH variable

-SET ARCHOPTS=

-:: TODO depends on SANITIZE variable

-SET DFLAGS=-g3 -DDEBUG

+SET ARCH=PORTABLE

+clang -march=native -dM -E - < NUL | findstr /C:"__AVX2__" >NUL 2>&1

+if %ERRORLEVEL% EQU 0 (

+    SET ARCH=AVX2

+    SET ARCHOPTS=-mavx2

+    goto :ArchDone

+)

+clang -march=native -dM -E - < NUL | findstr /C:"__ARM_NEON" >NUL 2>&1

+if %ERRORLEVEL% EQU 0 (

+    SET ARCH=NEON

+    goto :ArchDone

+)

+:ArchDone

+

 

+SET DFLAGS=-g3 -DDEBUG

 SET WARNINGS=-Wno-deprecated-declarations

 SET VARIABLES=-DTHREADS=%THREADS% -D%ARCH%

 SET OFLAGS=-O3

@@ -28,7 +38,9 @@ SET STACKSIZE=-Wl,-stack:16777216
 SET LFLAGS=%STACKSIZE%

 

 :: Python libraries - change to match your local installation

-SET PYPATH=%userprofile%\AppData\Local\Programs\Python\Python313

+for /f "delims=" %%i in ('python -c "import sys; print(sys.base_prefix)"') do set PYPATH=%%i

+::SET PYPATH=%userprofile%\AppData\Local\Programs\Python\Python313

+

 SET PYINCLUDE=%PYPATH%\include

 SET PYLIBS=%PYPATH%\libs