unify host programs across targets

wasm.just

@@ -10,7 +10,7 @@ WASI_CFLAGS := "\
 -O0 \
 -nostdlib \
 -Wl,--no-entry \
--Wl,--export-all \
+-Wl,--export=wasm_module \
 -Wl,--no-gc-sections \
 -Wl,--initial-memory=65536 \
 -Wl,--export=__heap_base \
@@ -101,6 +101,7 @@ build-c-module module target="fail":
         exit 1
     fi
 
+[private]
 copy-c-module module:
     cp targets/wasm-module/{{ module }}.cpp {{ BUILD_DIR }}-{{ module }}/wasm-module.cpp
 
@@ -158,8 +159,8 @@ LINUX_BAREMETAL_INCLUDES := f"\
 
 [doc("Insert the AOT array into the host program")]
 [group("2: build host")]
-prepare-aot-host module target="fail":
-    cp targets/wasm-host/{{ target }}.c {{ BUILD_DIR }}-{{ module }}/module_host.c
+prepare-aot-host module:
+    cp targets/wasm-host/wasm_host.c {{ BUILD_DIR }}-{{ module }}/module_host.c
     sed -i \
         -e "s/__WASM_ARRAY_FILE__/wasm_aot_array.c/g" \
         -e "s/__WASM_ARRAY__/build_{{ module }}_wasm_module_aot/g" \
@@ -168,8 +169,8 @@ prepare-aot-host module target="fail":
 
 [doc("Insert the WASM array into the host program")]
 [group("2: build host")]
-prepare-interp-host module target="fail":
-    cp targets/wasm-host/{{ target }}.c {{ BUILD_DIR }}-{{ module }}/module_host.c
+prepare-interp-host module:
+    cp targets/wasm-host/wasm_host.c {{ BUILD_DIR }}-{{ module }}/module_host.c
     sed -i \
         -e "s/__WASM_ARRAY_FILE__/wasm_interp_array.c/g" \
         -e "s/__WASM_ARRAY__/build_{{ module }}_wasm_module_wasm/g" \
@@ -179,18 +180,21 @@ prepare-interp-host module target="fail":
 [private]
 build-wasm-host-fail module:
     {{ CROSS_CC }} {{ CROSS_CFLAGS }} {{ CROSS_INCLUDES }} \
+      -DTARGET_FAIL \
       -c {{ BUILD_DIR }}-{{ module }}/module_host.c \
       -o {{ BUILD_DIR }}-{{ module }}/system.o
 
 [private]
 build-wasm-host-linux module:
     {{ LINUX_CC }} {{ LINUX_CFLAGS }} {{ LINUX_INCLUDES }} \
+      -DTARGET_LINUX \
       -c {{ BUILD_DIR }}-{{ module }}/module_host.c \
       -o {{ BUILD_DIR }}-{{ module }}/system.o
 
 [private]
 build-wasm-host-linux-baremetal module:
     {{ CROSS_CC }} {{ LINUX_BAREMETAL_CFLAGS }} {{ LINUX_BAREMETAL_INCLUDES }} \
+      -DTARGET_LINUX_BAREMETAL \
       -c {{ BUILD_DIR }}-{{ module }}/module_host.c \
       -o {{ BUILD_DIR }}-{{ module }}/system.o
 
@@ -212,13 +216,15 @@ build-wasm-host module target="fail":
 [private]
 build-c-host-fail module:
     {{ CROSS_CC }} {{ CROSS_CFLAGS_NOWASM }} \
-      -c targets/c-host/fail.c \
+      -DTARGET_FAIL \
+      -c targets/c-host/c_host.c \
       -o {{ BUILD_DIR }}-{{ module }}/c_host.o
 
 [private]
 build-c-host-linux module:
     {{ LINUX_CC }} {{ LINUX_CFLAGS_NOWASM }} \
-      -c targets/c-host/linux.c \
+      -DTARGET_LINUX \
+      -c targets/c-host/c_host.c \
       -o {{ BUILD_DIR }}-{{ module }}/c_host.o
 
 [doc("Insert the C function into the host program (no WASM)")]