Allow splitting nextpnr-himbaechel per microarchitecture.

This is added primarily for YoWASP.

CMakeLists.txt

@@ -241,7 +241,18 @@ add_subdirectory(rust)
 add_subdirectory(tests/gui)
 
 function(add_nextpnr_architecture target)
-    cmake_parse_arguments(arg "" "MAIN_SOURCE" "CORE_SOURCES;TEST_SOURCES" ${ARGN})
+    cmake_parse_arguments(arg "" "MAIN_SOURCE" "CORE_SOURCES;TEST_SOURCES;CURRENT_SOURCE_DIR;CURRENT_BINARY_DIR" ${ARGN})
+
+    if (NOT arg_CURRENT_SOURCE_DIR)
+        set(arg_CURRENT_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
+    endif()
+    if (NOT arg_CURRENT_BINARY_DIR)
+        set(arg_CURRENT_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR})
+    endif()
+
+    set(arg_MAIN_SOURCE "${arg_CURRENT_SOURCE_DIR}/${arg_MAIN_SOURCE}")
+    list(TRANSFORM arg_CORE_SOURCES PREPEND ${arg_CURRENT_SOURCE_DIR}/)
+    list(TRANSFORM arg_TEST_SOURCES PREPEND ${arg_CURRENT_SOURCE_DIR}/)
 
     # Defs library: used by everything
     #
@@ -251,7 +262,7 @@ function(add_nextpnr_architecture target)
 
     target_include_directories(nextpnr-${target}-defs INTERFACE
         ${CMAKE_SOURCE_DIR}/common/kernel
-        ${CMAKE_CURRENT_SOURCE_DIR}
+        ${arg_CURRENT_SOURCE_DIR}
     )
 
     string(TOUPPER ${family} family_upper)
@@ -290,7 +301,7 @@ function(add_nextpnr_architecture target)
     endif()
 
     if (BUILD_GUI)
-        add_subdirectory(${CMAKE_SOURCE_DIR}/gui ${CMAKE_CURRENT_BINARY_DIR}/gui)
+        add_subdirectory(${CMAKE_SOURCE_DIR}/gui ${arg_CURRENT_BINARY_DIR}/gui)
 
         # Upsettingly, there is a cyclic dependency between `common/kernel` and `gui`, so these
         # two libraries have to be added separately to all executable targets.

README.md

@@ -181,6 +181,18 @@ sudo make install
 
 To build every available stable architecture, use `-DARCH=all`. To include experimental arches (currently nexus), use `-DARCH=all+alpha`.
 
+### Per-microarchitecture Himbächel
+
+To build a single nextpnr-himbachel executable for each of the supported microarchitectures, use `-DHIMBAECHEL_SPLIT`.
+
+```
+cmake . -DARCH="himbaechel" -DHIMBAECHEL_UARCH="gowin;ng-ultra"
+make -j$(nproc)
+sudo make install
+```
+
+In such a build, instead of a single `nextpnr-himbaechel` binary, two binaries `nextpnr-himbaechel-gowin` and `nextpnr-himbaechel-ng-ultra` are built. Although they are installed together, each microarchitecture is completely independent of the other, and only needs its corresponding `.../share/himbaechel/<microarchitecture>/` chip database directory to run. Split build reduces the size of individual distributed artifacts (although the total size increases), and allows co-installation of artifacts of different versions.
+
 Cross-compilation
 -----------------
 

himbaechel/CMakeLists.txt

@@ -1,4 +1,6 @@
-set(SOURCES
+option(HIMBAECHEL_SPLIT "Whether to build one executable per Himbächel microarchitecture" OFF)
+
+set(HIMBAECHEL_SOURCES
     arch.cc
     archdefs.h
     arch.h
@@ -13,8 +15,32 @@ set(SOURCES
     himbaechel_helpers.h
 )
 
-add_nextpnr_architecture(${family}
+if (HIMBAECHEL_SPLIT)
-    CORE_SOURCES ${SOURCES}
+
+    function(add_nextpnr_himbaechel_microarchitecture microtarget)
+        cmake_parse_arguments(arg "" "" "CORE_SOURCES;TEST_SOURCES" ${ARGN})
+
+        list(TRANSFORM arg_CORE_SOURCES PREPEND ${CMAKE_CURRENT_SOURCE_DIR}/)
+        list(TRANSFORM arg_TEST_SOURCES PREPEND ${CMAKE_CURRENT_SOURCE_DIR}/)
+
+        add_nextpnr_architecture(himbaechel-${microtarget}
+            CORE_SOURCES ${HIMBAECHEL_SOURCES}
+            MAIN_SOURCE  main.cc
+            CURRENT_SOURCE_DIR ${CMAKE_SOURCE_DIR}/himbaechel
+            CURRENT_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR}
+        )
+
+        target_sources(nextpnr-himbaechel-${microtarget}-core INTERFACE ${arg_CORE_SOURCES})
+
+        if (BUILD_TESTS)
+            target_sources(nextpnr-himbaechel-${microtarget}-test PRIVATE ${arg_TEST_SOURCES})
+        endif()
+    endfunction()
+
+else()
+
+    add_nextpnr_architecture(himbaechel
+        CORE_SOURCES ${HIMBAECHEL_SOURCES}
         MAIN_SOURCE  main.cc
     )
 
@@ -32,6 +58,8 @@ function(add_nextpnr_himbaechel_microarchitecture microtarget)
         endif()
     endfunction()
 
+endif()
+
 set(HIMBAECHEL_UARCHES example gowin xilinx ng-ultra)
 
 set(HIMBAECHEL_UARCH "" CACHE STRING "Microarchitectures for nextpnr-himbaechel build")