lnstools

commit 40784be9f20d5d9695debac30a044070d53f83d9
Author: Jan Pobrislo <ccx@te2000.cz>
Date:   Mon,  3 Mar 2025 13:34:23 +0000

Initial commit; working single executable build.

Diffstat:
A
.gitignore
 | 
2
++
A
Makefile
 | 
9
+++++++++
A
scripts/cc
 | 
5
+++++
A
scripts/codedeps.awk
 | 
56
++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A
scripts/link
 | 
2
++
A
simplelink.mk
 | 
33
+++++++++++++++++++++++++++++++++
A
src/hello_main.c
 | 
10
++++++++++

7 files changed, 117 insertions(+), 0 deletions(-)
diff --git a/.gitignore b/.gitignore
@@ -0,0 +1,2 @@
+*.sw[op]
+build
diff --git a/Makefile b/Makefile
@@ -0,0 +1,9 @@
+all: all_executables
+.PHONY: all
+
+executables:=hello
+include simplelink.mk
+
+clean:
+	rm -r build
+.PHONY: clean
diff --git a/scripts/cc b/scripts/cc
@@ -0,0 +1,5 @@
+#!/bin/sh -xe
+exec gcc -D_GNU_SOURCE -Werror \
+  -pipe -std=c11 -fno-exceptions -fno-unwind-tables -fno-asynchronous-unwind-tables -ffunction-sections -fdata-sections \
+  "$@" -static -g
+# -Wall 
diff --git a/scripts/codedeps.awk b/scripts/codedeps.awk
@@ -0,0 +1,56 @@
+BEGIN {
+	if(length(target) == 0 || length(srcname) == 0) {
+		exit 2
+	}
+}
+
+/^# [0-9]+ "[^"]+"( [0-9]+)*$/ && $3 !~ /^"[<\/]/ {
+	inc[$3]=1
+}
+
+/^\/\/ \{IMP\} /{
+	imp[substr($0,10)]
+}
+
+function depname(s) {
+	sub(/"$/, "", s)
+	sub(/^"/, "", s)
+	return s
+}
+
+function deparray(fname) {
+	gsub(/[^a-zA-Z0-9_]/, "__", fname)
+	return "LINKDEP_" fname
+}
+
+function objfile(fname) {
+	sub(/\.c$/, ".o", fname)
+	return "build/" fname
+}
+
+END {
+	da = deparray(srcname)
+	printf "ifndef %s\n\n", da
+	printf "%s:", target
+	for(f in inc) {
+		printf " %s", depname(f)
+	}
+	printf "\n\n"
+	printf "%s:=%s\n", deparray(srcname), objfile(srcname)
+	append = 0
+	for(f in imp){
+		if(f == srcname) {
+			continue
+		}
+		printf "include build/%s.deps.mk\n", f
+		append = 1
+	}
+	if(append) {
+		printf "%s+= $(sort ", da
+		for(f in imp){
+			printf " $(%s)", deparray(f)
+		}
+		printf ")\n"
+	}
+	printf "\nendif\n"
+}
diff --git a/scripts/link b/scripts/link
@@ -0,0 +1,2 @@
+#!/bin/sh -xe
+exec gcc -static "$@"
diff --git a/simplelink.mk b/simplelink.mk
@@ -0,0 +1,33 @@
+SRC_DIR ?= src
+BUILD_DIR ?= build
+SCRIPTS_DIR ?= scripts
+
+all_executables: $(patsubst %,$(BUILD_DIR)/%,$(executables))
+.PHONY: all_executables
+
+define simplelink =
+include $$(BUILD_DIR)/$(1)_main.c.deps.mk
+$$(BUILD_DIR)/$(1): $$(LINKDEP_$(1)_main__c) $$(SCRIPTS_DIR)/link $$(BUILD_DIR)/$(1)_main.c.deps.mk
+	$$(SCRIPTS_DIR)/link -o '$$@' $$(LINKDEP_$(1)_main__c)
+endef
+$(foreach var,$(executables),$(eval $(call simplelink,$(var))))
+
+## pattern rules:
+
+# preprocess C sources
+$(BUILD_DIR)/%.c.i: $(SRC_DIR)/%.c $(SCRIPTS_DIR)/cc $(BUILD_DIR)/.exists
+	$(SCRIPTS_DIR)/cc -E -C -o '$@' '$(SRC_DIR)/$*.c'
+
+# compile preprocessed C sources
+$(BUILD_DIR)/%.o: $(BUILD_DIR)/%.c.i $(SCRIPTS_DIR)/cc
+	$(SCRIPTS_DIR)/cc -fpreprocessed -c -o '$@' '$(BUILD_DIR)/$*.c.i'
+
+# extract dependencies from preprocessed sources
+$(BUILD_DIR)/%.c.deps.mk: $(BUILD_DIR)/%.c.i $(SCRIPTS_DIR)/codedeps.awk
+	awk -v srcname='$*.c' -v target='$(BUILD_DIR)/$*.c.i' -f $(SCRIPTS_DIR)/codedeps.awk '$(BUILD_DIR)/$*.c.i' >'$@.new'
+	mv '$@.new' '$@'
+
+# create directory if missing
+%/.exists:
+	mkdir -p '$*'
+	touch '$@'
diff --git a/src/hello_main.c b/src/hello_main.c
@@ -0,0 +1,10 @@
+#include <stdio.h>
+
+int main(int argc, char const *const *argv)
+{
+  if(printf("Hello %s!\n", "world") < 0) {
+       perror("error printing string");
+       return 111;
+  }
+  return 0;
+}