Add support for easy geneation of pkg-config files

A replace function is added to ease the generation of a .pc file based on
a template. Default rules to build and install the .pc files are added too.

otherproj now provides a pkg-config file and lib2 uses some otherproj
CFLAGS as an example.

diff --git a/Lib.mak b/Lib.mak
index 526fb176b364450da78b856252317b370fdfbab7..6a6c9f9de4c740345df5e4946b7e4e0d5bd002d3 100644 (file)
--- a/Lib.mak
+++ b/Lib.mak
@@ -169,6 +169,20 @@ install_file = $(call exec,install -m $(if $1,$1,0644) $(if $2,$2,-D) \
 # Will produce something like "a -- b --"
 varcat = $(foreach v,$1,$($2$v)$(if $3,$3, ~))
 
+# Replace variables with specified values in a template file.  The first
+# argument is a list of make variables names which will be replaced in the
+# target file.  The strings @VARNAME@ in the template file will be replaced
+# with the value of the make $(VARNAME) variable and the result will be stored
+# in the target file.  The second (optional) argument is a prefix to add to the
+# make variables names, so if the prefix is PREFIX_ and @VARNAME@ is found in
+# the template file, it will be replaced by the value of the make variable
+# $(PREFIX_VARNAME).  The third and fourth arguments are the source file and
+# the destination file (both optional, $< and $@ are used if omitted). The
+# fifth (optional) argument are options to pass to the substitute sed command
+# (for example, use "g" if you want to do multiple substitutions per line).
+replace = $(call exec,sed '$(foreach v,$1,s|@$v@|$($2$v)|$5;)' $(if $3,$3,$<) \
+               > $(if $4,$4,$@))
+
 # Create a symbolic link to the project under the $(INCLUDE_DIR). The first
 # argument is the name of symlink to create.  The link is only created if it
 # doesn't already exist.
@@ -254,6 +268,10 @@ $L/%.so: override CXXFLAGS += -fPIC
 $L/%.so: $G/link-o-flags
        $(call link,-shared)
 
+# Create pkg-config files using a template
+$L/%.pc:
+       $(call replace,$(PC_VARS),$*-PC-)
+
 # Install binary programs
 $I/bin/%:
        $(call install_file,0755)
@@ -262,6 +280,10 @@ $I/bin/%:
 $I/sbin/%:
        $(call install_file,0755)
 
+# Install pkg-config specification files
+$I/lib/pkgconfig/%:
+       $(call install_file)
+
 # Install libraries
 $I/lib/%:
        $(call install_file)

diff --git a/lib2/Build.mak b/lib2/Build.mak
index ba7d5104691a174c855069289ebc72a306ba3912..4f201de2da5243f4ddc707588e7e82ea3e002554 100644 (file)
--- a/lib2/Build.mak
+++ b/lib2/Build.mak
@@ -1,5 +1,6 @@
 
 # Build the shared library
+$L/liblib2.so: CXXFLAGS += $(otherproj-PC-CFLAGS)
 $L/liblib2.so: $(call find_objects,cpp) $L/liblib1.so $L/libotherproj.so
 
 # Nice shortcut target

diff --git a/subproj/Build.mak b/subproj/Build.mak
index 9552ae094d342960bba71de83f09ca2d78dd151c..b391b79ed030f9c08d4adf0424e2f002180a1778 100644 (file)
--- a/subproj/Build.mak
+++ b/subproj/Build.mak
@@ -1,19 +1,33 @@
 
-# Create the include directory symlink
-setup_include_dir__ := $(call symlink_include_dir,otherproj)
-
-# Build the shared library
-$L/libotherproj.so: LINKER := $(CC)
-$L/libotherproj.so: $(call find_objects,c)
+# Symbolic target to add to all
+.PHONY: otherproj
 all += otherproj
 
-# Nice shortcut target
-.PHONY: otherproj
-otherproj: $L/libotherproj.so
+# pkg-config specification file
+otherproj-PC-PREFIX := $(prefix)
+otherproj-PC-NAME := otherproj
+otherproj-PC-DESC := Some other project
+otherproj-PC-URL := http://www.otherproj.example.com/
+otherproj-PC-VERSION := 1.0
+otherproj-PC-LIBS := -lotherproject
+otherproj-PC-CFLAGS := -DOTHERPROJ_DEFINE
+otherproj-PC-VARS := PREFIX NAME DESC URL VERSION LIBS CFLAGS
+$L/otherproj.pc: PC_VARS := $(otherproj-PC-VARS)
+$L/otherproj.pc: $C/otherproj.pc.in $L/otherproj.pc-flags
+# trigger a rebuild when flags change
+setup_flags_files__ := $(call gen_rebuild_flags,$L/otherproj.pc-flags,\
+               $(call varcat,$(otherproj-PC-VARS),otherproj-PC-))
+# install
+$I/lib/pkgconfig/otherproj.pc: $L/otherproj.pc
+install += $I/lib/pkgconfig/otherproj.pc
+otherproj: $L/otherproj.pc
 
-# Install the shared library
+# Shared library
+$L/libotherproj.so: LINKER := $(CC)
+$L/libotherproj.so: $(call find_objects,c)
 $I/lib/libotherproj.so: $L/libotherproj.so
 install += $I/lib/libotherproj.so
+otherproj: $L/libotherproj.so
 
 # Install the library's headers
 $I/include/otherproj/%.h: $C/%.h
@@ -21,3 +35,6 @@ $I/include/otherproj/%.h: $C/%.h
 # XXX: we can't use += here, call will be resolved lazily if we do
 install := $(install) $(call find_headers,h,$I/include/otherproj)
 
+# Create the include directory symlink and pkg-config flags file
+setup_include_dir__ := $(call symlink_include_dir,otherproj)
+

diff --git a/subproj/otherproj.pc.in b/subproj/otherproj.pc.in
new file mode 100644 (file)
index 0000000..dd4c457
--- /dev/null
+++ b/subproj/otherproj.pc.in
@@ -0,0 +1,13 @@
+
+prefix=@PREFIX@
+exec_prefix=${prefix}
+libdir=${exec_prefix}/lib
+includedir=${prefix}/include
+
+Name: @NAME@
+Description: @DESC@
+URL: @URL@
+Version: @VERSION@
+Libs: -L${libdir} @LIBS@
+Cflags: -I${includedir} @CFLAGS@
+