add a c-only target (no WASM)

wasm.just

@@ -16,6 +16,35 @@ WASI_CFLAGS := "\
 -Wl,--export=__heap_base \
 -Wl,--export=__data_end \
 "
+CROSS_CFLAGS_NOWASM := "\
+-m32 \
+-ffunction-sections \
+-fdata-sections \
+-ffreestanding \
+-fomit-frame-pointer \
+-ggdb \
+"
+CROSS_LDFLAGS_NOWASM := f"\
+-Wl,--build-id=none \
+-static \
+-nostdlib \
+-m32 \
+-lc \
+-lgcc \
+-lm \
+"
+LINUX_CFLAGS_NOWASM := "\
+-O0 \
+-m32 \
+-ffunction-sections \
+-fdata-sections \
+-ggdb \
+"
+LINUX_LDFLAGS_NOWASM := f"\
+-Wl,--build-id=none \
+-m32 \
+-lm \
+"
 WAMRC := "wamrc"
 WAMRCFLAGS := "\
 --target=i386 \
@@ -44,32 +73,38 @@ build-wasm-aot-array module:
 build-wasm-interp-array module:
     {{ XXD }} -i {{ BUILD_DIR }}-{{ module }}/wasm_module.wasm > {{ BUILD_DIR }}-{{ module }}/wasm_interp_array.c
 
+[private]
+build-c-module-fail module:
+    {{ CROSS_CC }} {{ CROSS_CFLAGS_NOWASM }} \
+      -c targets/wasm-module/{{ module }}.c \
+      -o {{ BUILD_DIR }}-{{ module }}/c_module.o
+
+[private]
+build-c-module-linux module:
+    {{ LINUX_CC }} {{ LINUX_CFLAGS_NOWASM }} \
+      -c targets/wasm-module/{{ module }}.c \
+      -o {{ BUILD_DIR }}-{{ module }}/c_module.o
+
+[doc("C -> Object: Compile a C function (no WASM)")]
+[group("1: build module")]
+build-c-module module target="fail":
+    #!/usr/bin/env sh
+    if [ "{{ target }}" = "fail" ]; then
+        just build-c-module-fail "{{ module }}"
+    elif [ "{{ target }}" = "linux" ]; then
+        just build-c-module-linux "{{ module }}"
+    else
+        echo "unknown target: {{ target }}" >&2
+        exit 1
+    fi
+
 # =================================================================================================================== #
 # Host program recipes
 # =================================================================================================================== #
 # FAIL*
 
-CROSS_CFLAGS := "\
--I./targets/wasm-host \
--O2 \
--m32 \
--ffunction-sections \
--fdata-sections \
--ffreestanding \
--fomit-frame-pointer \
--ggdb \
-"
-CROSS_LDFLAGS := f"\
--Wl,--build-id=none \
--static \
--nostdlib \
--m32 \
--L{{LIBIWASM_RELEASE}} \
--liwasm \
--lc \
--lgcc \
--lm \
-"
+CROSS_CFLAGS := f"-I./targets/wasm-host {{CROSS_CFLAGS_NOWASM}} -O2"
+CROSS_LDFLAGS := f"{{CROSS_LDFLAGS_NOWASM}} -L{{LIBIWASM_RELEASE}} -liwasm"
 CROSS_INCLUDES := f"\
 -I{{WAMR_ROOT}}/core/iwasm/include \
 -I{{WAMR_ROOT}}/core/shared/utils \
@@ -78,22 +113,8 @@ CROSS_INCLUDES := f"\
 
 # LINUX-POSIX
 
-LINUX_CFLAGS := "\
--I./targets/wasm-host \
--O0 \
--m32 \
--ffunction-sections \
--fdata-sections \
--ggdb \
-"
-LINUX_LDFLAGS := f"\
--Wl,--build-id=none \
--m32 \
--Wl,-rpath,{{LIBIWASM_LINUX_DEBUG}} \
--L{{LIBIWASM_LINUX_DEBUG}} \
--liwasm \
--lm \
-"
+LINUX_CFLAGS := f"-I./targets/wasm-host {{ LINUX_CFLAGS_NOWASM }}"
+LINUX_LDFLAGS := f"{{LINUX_LDFLAGS_NOWASM}} -Wl,-rpath,{{LIBIWASM_LINUX_DEBUG}} -L{{LIBIWASM_LINUX_DEBUG}} -liwasm"
 LINUX_INCLUDES := f"\
 -I{{WAMR_ROOT}}/core/iwasm/include \
 -I{{WAMR_ROOT}}/core/shared/utils \
@@ -182,6 +203,32 @@ build-wasm-host module target="fail":
         exit 1
     fi
 
+[private]
+build-c-host-fail module:
+    {{ CROSS_CC }} {{ CROSS_CFLAGS_NOWASM }} \
+      -c targets/c-host/fail.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 \
+      -o {{ BUILD_DIR }}-{{ module }}/c_host.o
+
+
+[doc("Insert the C function into the host program (no WASM)")]
+[group("2: build host")]
+build-c-host module target="fail":
+    #!/usr/bin/env sh
+    if [ "{{ target }}" = "fail" ]; then
+        just build-c-host-fail "{{ module }}"
+    elif [ "{{ target }}" = "linux" ]; then
+        just build-c-host-linux "{{ module }}"
+    else
+        echo "unknown target: {{ target }}" >&2
+        exit 1
+    fi
+
 [private]
 build-system-startup-fail module:
     {{ CROSS_CC }} targets/startup.s {{ CROSS_CFLAGS }} -c -o {{ BUILD_DIR }}-{{ module }}/startup.o
@@ -256,6 +303,37 @@ link-system module target="fail":
         exit 1
     fi
 
+[private]
+link-c-system-fail module:
+    {{ CROSS_CC }} \
+        -Wl,-T targets/linker.ld \
+        {{ BUILD_DIR }}-{{ module }}/c_host.o \
+        {{ BUILD_DIR }}-{{ module }}/startup.o \
+        {{ BUILD_DIR }}-{{ module }}/c_module.o \
+        {{ CROSS_LDFLAGS_NOWASM }} \
+        -o {{ BUILD_DIR }}-{{ module }}/system.elf
+
+[private]
+link-c-system-linux module:
+    {{ LINUX_CC }} \
+        {{ BUILD_DIR }}-{{ module }}/c_host.o \
+        {{ BUILD_DIR }}-{{ module }}/c_module.o \
+        {{ LINUX_LDFLAGS_NOWASM }} \
+        -o {{ BUILD_DIR }}-{{ module }}/system.elf
+
+[doc("Link C-Host, C-function and bootloader")]
+[group("2: build host")]
+link-c-system module target="fail":
+    #!/usr/bin/env sh
+    if [ "{{ target }}" = "fail" ]; then
+        just link-c-system-fail "{{ module }}"
+    elif [ "{{ target }}" = "linux" ]; then
+        just link-c-system-linux "{{ module }}"
+    else
+        echo "unknown target: {{ target }}" >&2
+        exit 1
+    fi
+
 [doc("Create bootdisk")]
 [group("2: build host")]
 build-iso module: