build: Enhance shadow build for package install

This patch is to allow better shadow build similar to uftrace. Most of the code are copied from uftrace build system. Signed-off-by: Honggyu Kim <[email protected]>
honggyukim · Dec 3, 2022 · f33b43c · f33b43c
1 parent f3eaee8
commit f33b43c
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Showing 2 changed files with 78 additions and 13 deletions.
diff --git a/Makefile b/Makefile
@@ -1,14 +1,24 @@
 # Copyright (c) 2022 LG Electronics Inc.
 # SPDX-License-Identifier: GPL-2.0
-ifneq ($(wildcard .config),)
-  include .config
+prefix ?= /usr/local
+bindir = $(prefix)/bin
+libdir = $(prefix)/lib
+
+srcdir = $(CURDIR)
+# set objdir to $(O) by default (if any)
+ifeq ($(objdir),)
+    ifneq ($(O),)
+        objdir = $(O)
+    else
+        objdir = $(CURDIR)
+    endif
 endif
 
-prefix ?= /usr
-DESTDIR := $(prefix)
+ifneq ($(wildcard $(objdir)/.config),)
+  include $(objdir)/.config
+endif
 
-srcdir ?= $(CURDIR)
-objdir ?= $(CURDIR)
+export CC CXX LD srcdir objdir LDFLAGS
 
 ifdef CROSS_COMPILE
   CC  := $(CROSS_COMPILE)gcc
@@ -67,14 +77,14 @@ libheaptrace.so: $(LIB_OBJS)
 	$(QUIET_LINK)$(CXX) -shared -o $(objdir)/$@ $^ $(LIB_LDFLAGS)
 
 install: all
-	mkdir -p $(DESTDIR)/bin $(DESTDIR)/lib
-	install -m 755 heaptrace $(DESTDIR)/bin/heaptrace
-	install -m 755 libheaptrace.so $(DESTDIR)/lib/libheaptrace.so
+	mkdir -p $(DESTDIR)$(bindir) $(DESTDIR)$(libdir)
+	install -m 755 $(objdir)/heaptrace $(DESTDIR)$(bindir)/heaptrace
+	install -m 755 $(objdir)/libheaptrace.so $(DESTDIR)$(libdir)/libheaptrace.so
 
 uninstall:
-	rm -f $(DESTDIR)/bin/heaptrace
-	rm -f $(DESTDIR)/lib/libheaptrace.so
+	rm -f $(DESTDIR)$(bindir)/heaptrace
+	rm -f $(DESTDIR)$(libdir)/libheaptrace.so
 
 clean:
-	rm -f heaptrace libheaptrace.so $(LIB_OBJS) $(HEAPTRACE_OBJS)
+	rm -f $(objdir)/heaptrace $(objdir)/libheaptrace.so $(LIB_OBJS) $(HEAPTRACE_OBJS)
 	$(MAKE) -C samples clean
diff --git a/configure b/configure
@@ -2,12 +2,67 @@
 # Copyright (c) 2022 LG Electronics Inc.
 # SPDX-License-Identifier: GPL-2.0
 
+prefix=/usr/local
+
 srcdir=$(readlink -f $(dirname $0))
 objdir=$(readlink -f ${objdir:-${PWD}})
 output=${output:-${objdir}/.config}
 
+usage() {
+    echo "Usage: $0 [<options>]
+
+  --help                print this message
+  --prefix=<DIR>        set install root dir as <DIR>        (default: /usr/local)
+  --bindir=<DIR>        set executable install dir as <DIR>  (default: \${prefix}/bin)
+  --libdir=<DIR>        set library install dir as <DIR>     (default: \${prefix}/lib)
+  --objdir=<DIR>        set build dir as <DIR>               (default: \${PWD})
+"
+    exit 1
+}
+
+while getopts ":ho:-:p" opt; do
+    case "$opt" in
+        -)
+	    # process --long-options
+	    case "$OPTARG" in
+                help)            usage ;;
+                *=*)             opt=${OPTARG%%=*}; val=${OPTARG#*=}
+                                 eval "${opt/-/_}='$val'" ;;
+                *)               ;;
+            esac
+	    ;;
+        o)       output=$OPTARG ;;
+        *)       usage ;;
+    esac
+done
+shift $((OPTIND - 1))
+
+bindir=${bindir:-${prefix}/bin}
+libdir=${libdir:-${prefix}/lib}
+
 # objdir can be changed, reset output
 objdir=$(readlink -f ${objdir})
+output=${output:-${objdir}/.config}
+
+cat >$output <<EOF
+# this file is generated automatically
+override prefix := $prefix
+override bindir := $bindir
+override libdir := $libdir
+EOF
+
+cat >$output <<EOF
+
+override CC     := $CC
+override CXX    := $CXX
+override LD     := $LD
+override CFLAGS  = $CFLAGS
+override CXXLAGS = $CXXLAGS
+override LDFLAGS = $LDFLAGS
+
+override srcdir := $srcdir
+override objdir := $objdir
+EOF
 
 if [ "$srcdir" != "$objdir" ]; then
     cat > $objdir/Makefile <<EOF
@@ -27,7 +82,7 @@ clean:
 install:
 	@\$(MAKE) -C \$(srcdir) install
 
-.PHONY: all clean tinstall
+.PHONY: all clean install
 EOF
     if [ $(id -u) -eq 0 ]; then
         chmod 666 $objdir/Makefile