commit c59d074a64255216715a01921f2644ad59fb43fe
parent 685ae1e301d8d4901b9ed0ead7f72f7dfcbb1343
Author: Jan Pobrislo <ccx@te2000.cz>
Date: Sun, 16 Nov 2025 12:45:26 +0000
Create simplistic configure script to generate compiler and linker scripts
Diffstat:
5 files changed, 136 insertions(+), 10 deletions(-)
diff --git a/Makefile b/Makefile
@@ -1,9 +1,12 @@
-all: all_executables
-.PHONY: all
+default: static_executables
+.PHONY: default
executables:=lns-lockdown lns-envuidgid lns-applyuidgid lns-pidns
include simplelink.mk
+build/cc build/ld.shared build/ld.static:
+ @printf '%s\n' "Please run configure script first!"; exit 1
+
clean:
rm -r build
.PHONY: clean
diff --git a/configure b/configure
@@ -0,0 +1,54 @@
+#!/bin/sh
+cd "$(dirname "$0")" || exit $?
+sh=$(which sh) || exit $?
+export sh
+
+# CC
+# CFLAGS
+: ${CFLAGS=-D_GNU_SOURCE -Werror -pipe -std=c11 -fno-exceptions -fno-unwind-tables -fno-asynchronous-unwind-tables -ffunction-sections -fdata-sections -g}
+export CFLAGS
+# CPATH
+# CPPFLAGS
+# C_INCLUDE_PATH
+# LDFLAGS
+# LDLIBS
+: ${LDLIBS=-lskarnet -lcap}
+export LDLIBS
+# LIBRARY_PATH
+# LOADLIBES
+
+replace_if_different() {
+ if ! test -e "$1"; then
+ mv "$1.new" "$1" || exit $?
+ return 0
+ fi
+ local R
+ cmp -s "$1" "$1.new"
+ R=$?
+ case $R in
+ (0)
+ rm "$1.new" || exit $?
+ ;;
+ (1)
+ mv "$1.new" "$1" || exit $?
+ ;;
+ (*)
+ printf >&2 "configure: fatal: failed to compare files %s and %s\n" "$1" "$1.new"
+ exit $R
+ ;;
+ esac
+}
+
+generate() {
+ local out=$1
+ shift || exit $?
+ "$@" >"$out.new" || exit $?
+ chmod +x "$out.new" || exit $?
+ replace_if_different "$out" || exit $?
+}
+
+mkdir -p build || exit $?
+
+generate build/cc awk -f ./scripts/gen-cc
+generate build/ld.shared awk -f ./scripts/gen-ld
+generate build/ld.static env LDFLAGS="$LDFLAGS -static" awk -f ./scripts/gen-ld
diff --git a/scripts/gen-cc b/scripts/gen-cc
@@ -0,0 +1,37 @@
+#!/bin/awk -f
+#LIBRARY_PATH
+#CPATH
+#C_INCLUDE_PATH
+#CPLUS_INCLUDE_PATH
+#OBJC_INCLUDE_PATH
+# '$(CC) $(CPPFLAGS) $(CFLAGS) -c'
+# '$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c'
+# '$(CC) $(LDFLAGS) N.o $(LOADLIBES) $(LDLIBS)'
+
+function shquote(text) {
+ if(text !~ "[^-+,_./:@0-9A-Za-z]") {
+ return text
+ }
+ gsub("'", "'\\''", text)
+ return "'" text "'"
+}
+
+function or_(first, second) {
+ return length(first) ? first : second
+}
+
+function set_env(var) {
+ if(var in ENVIRON) {
+ print var "=" shquote(ENVIRON[var])
+ } else {
+ print "unset -v " var
+ }
+}
+
+BEGIN {
+ print "#!" or_(ENVIRON["sh"], "/bin/sh")
+ set_env("LIBRARY_PATH")
+ set_env("CPATH")
+ set_env("C_INCLUDE_PATH")
+ print "exec " or_(ENVIRON["CC"], "gcc") " " ENVIRON["CPPFLAGS"] " " ENVIRON["CFLAGS"] " \"$@\""
+}
diff --git a/scripts/gen-ld b/scripts/gen-ld
@@ -0,0 +1,28 @@
+#!/bin/awk -f
+
+function shquote(text) {
+ if(text !~ "[^-+,_./:@0-9A-Za-z]") {
+ return text
+ }
+ gsub("'", "'\\''", text)
+ return "'" text "'"
+}
+
+function or_(first, second) {
+ return length(first) ? first : second
+}
+
+function set_env(var) {
+ if(var in ENVIRON) {
+ print var "=" shquote(ENVIRON[var])
+ } else {
+ print "unset -v " var
+ }
+}
+
+BEGIN {
+ print "#!" or_(ENVIRON["sh"], "/bin/sh")
+ set_env("LIBRARY_PATH")
+ print "exec " or_(ENVIRON["CC"], "gcc") " " ENVIRON["LDFLAGS"] " \"$@\" " ENVIRON["LOADLIBES"] " " ENVIRON["LDLIBS"]
+}
+
diff --git a/simplelink.mk b/simplelink.mk
@@ -2,25 +2,29 @@ SRC_DIR ?= src
BUILD_DIR ?= build
SCRIPTS_DIR ?= scripts
-all_executables: $(patsubst %,$(BUILD_DIR)/%,$(executables))
-.PHONY: all_executables
+shared_executables: $(patsubst %,$(BUILD_DIR)/bin-shared/%,$(executables))
+static_executables: $(patsubst %,$(BUILD_DIR)/bin-static/%,$(executables))
+.PHONY: shared_executables static_executables
define simplelink =
include $$(BUILD_DIR)/$(1)_main.c.deps.mk
-$$(BUILD_DIR)/$(1): $$(LINKDEP_$(subst -,__,$(1))_main__c) $$(SCRIPTS_DIR)/link $$(BUILD_DIR)/$(1)_main.c.deps.mk
- $$(SCRIPTS_DIR)/link -o '$$@' $$(LINKDEP_$(subst -,__,$(1))_main__c)
+$$(BUILD_DIR)/bin-shared/$(1): $$(LINKDEP_$(subst -,__,$(1))_main__c) $$(BUILD_DIR)/ld.shared $$(BUILD_DIR)/$(1)_main.c.deps.mk $$(BUILD_DIR)/bin-shared/.exists
+ $$(BUILD_DIR)/ld.shared -o '$$@' $$(LINKDEP_$(subst -,__,$(1))_main__c)
+include $$(BUILD_DIR)/$(1)_main.c.deps.mk
+$$(BUILD_DIR)/bin-static/$(1): $$(LINKDEP_$(subst -,__,$(1))_main__c) $$(BUILD_DIR)/ld.static $$(BUILD_DIR)/$(1)_main.c.deps.mk $$(BUILD_DIR)/bin-static/.exists
+ $$(BUILD_DIR)/ld.static -o '$$@' $$(LINKDEP_$(subst -,__,$(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'
+$(BUILD_DIR)/%.c.i: $(SRC_DIR)/%.c $(BUILD_DIR)/cc $(BUILD_DIR)/.exists
+ $(BUILD_DIR)/cc -E -C -o '$@' '$(SRC_DIR)/$*.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'
+$(BUILD_DIR)/%.o: $(BUILD_DIR)/%.c.i $(BUILD_DIR)/cc
+ $(BUILD_DIR)/cc -fpreprocessed -c -o '$@' '$(BUILD_DIR)/$*.c.i'
# extract dependencies from preprocessed sources
$(BUILD_DIR)/%.c.deps.mk: $(BUILD_DIR)/%.c.i $(SCRIPTS_DIR)/codedeps.awk
