Re: Force a file to be compiled always
On Nov 4, 2010, Benjamin Bihler benjamin.bih...@twt-gmbh.de wrote: As to the third suggestion: I use the __DATE__ and __TIME__ macros in my code as a kind of version information. Therefore the compilation result differs with every compilation, although my source file does not change. Is there yet a better method to store the compilation time stamp in a library without fiddling with make targets? We do fiddle with make targets, but in this way: --[Makefile.am]8=== some_SOURCES=app.c # ensure to compile-in the current date app.$(OBJEXT): $(LIBDEPS) $(l...@mainmodulename@_a_SOURCES) Makefile ===8--- app.c includes some --[app.c]--8=== const char *const version = SYS_VERSION #if defined(DEBUG) (DEBUG), compiled __DATE__ __TIME__ #endif /* non-debug (but release-) versions are guaranteed to have a * unique dedicated SYS_VERSION */ ; ===8--- I'm not sure if this is best (correct), but seems to work well. I think the big advantage over .PHONY is that is does not re-genereate the binary (a new binary, actually!) if nothing was changed at all, which IMHO would be a bad habit. oki, Steffen
Re: Force a file to be compiled always
Hi Ralf, excuse me, I have sent this mail twice but in the mailing list the body seems to be empty. I will try it a last time with another method... your first suggestion (with the phony target) works great. The second one does not force compilation here (but that doesn't matter anymore since I use the phony target now). Hmm, do you have a file named FORCE in source or build tree? No. As to the third suggestion: I use the __DATE__ and __TIME__ macros in my code as a kind of version information. Therefore the compilation result differs with every compilation, although my source file does not change. Is there yet a better method to store the compilation time stamp in a library without fiddling with make targets? People do this, but I don't think storing the date and the time is the most useful thing to do. How about a different suggestion: store information generated from your version control repository? This would probably be the nicest thing to do. We will have to think about it... Hope that, and the other comments posted, help. Yes, very much! Bye, Benjamin
Re: Force a file to be compiled always
Hi Ralf, excuse me, I have sent this mail twice but in the mailing list the body seems to be empty. I will try it a last time with another method... your first suggestion (with the phony target) works great. The second one does not force compilation here (but that doesn't matter anymore since I use the phony target now). Hmm, do you have a file named FORCE in source or build tree? No. As to the third suggestion: I use the __DATE__ and __TIME__ macros in my code as a kind of version information. Therefore the compilation result differs with every compilation, although my source file does not change. Is there yet a better method to store the compilation time stamp in a library without fiddling with make targets? People do this, but I don't think storing the date and the time is the most useful thing to do. How about a different suggestion: store information generated from your version control repository? This would probably be the nicest thing to do. We will have to think about it... Hope that, and the other comments posted, help. Yes, very much! Bye, Benjamin
Re: Force a file to be compiled always
Re: Force a file to be compiled always
Re: Force a file to be compiled always
Hi Ralf, your first suggestion (with the phony target) works great. The second one does not force compilation here (but that doesn't matter anymore since I use the phony target now). As to the third suggestion: I use the __DATE__ and __TIME__ macros in my code as a kind of version information. Therefore the compilation result differs with every compilation, although my source file does not change. Is there yet a better method to store the compilation time stamp in a library without fiddling with make targets? Thank you very much and bye, Benjamin
Re: Force a file to be compiled always
Hi Ralf, your first suggestion (with the phony target) works great. The second one does not force compilation here (but that doesn't matter anymore since I use the phony target now). As to the third suggestion: I use the __DATE__ and __TIME__ macros in my code as a kind of version information. Therefore the compilation result differs with every compilation, although my source file does not change. Is there yet a better method to store the compilation time stamp in a library without fiddling with make targets? Thank you very much and bye, Benjamin
Re: Force a file to be compiled always
You probably want to have one object that has symbols for the date and the time, and this object to be depending on other objects. I am not an expert of Automake. But my solution seems to work. And this is: noinst_LTLIBRARIES=libfoo.la lib_LTLIBRARIES=liball.la libfoo_la_SOURCES=foo.c bar.c liball_la_SOURCES=time.c liball_la_LIBADD=libfoo.la $(liball_la_OBJECTS): $(libfoo_la_OBJECTS) time.c contains something like: const char build_time[] = __TIME__; const char build_date[] = __DATE__; And then, the date and time in the .rodata of your library should always be more recent than the build of the last object in libfoo. On Thu, Nov 4, 2010 at 9:33 AM, Benjamin Bihler benjamin.bih...@twt-gmbh.de wrote: Hi Ralf, your first suggestion (with the phony target) works great. The second one does not force compilation here (but that doesn't matter anymore since I use the phony target now). As to the third suggestion: I use the __DATE__ and __TIME__ macros in my code as a kind of version information. Therefore the compilation result differs with every compilation, although my source file does not change. Is there yet a better method to store the compilation time stamp in a library without fiddling with make targets? Thank you very much and bye, Benjamin -- Valentin David valentin.da...@gmail.com
Re: Force a file to be compiled always
On Thu, Nov 4, 2010 at 13:46 UTC, Valentin David valentin.da...@gmail.com wrote: You probably want to have one object that has symbols for the date and the time, and this object to be depending on other objects. The NTP reference implementation does something along these lines. Every time any consituent libraries or objects change for a binary, an updated version.c is generated containing the build timestamp as well as a generation counter for repeated builds in the same directory. version.c contains a line like: char * Version = ntpd 4.2.7...@1.2247-o Nov 03 19:17:08.92 (UTC-00:00) 2010 (1) ; (1) is the generation counter. This is wired into the Makefile.am by omitting version.c from program_SOURCES, adding version.o to program_LDADD, and adding a rule to build it like: version.o: $(ntpq_OBJECTS) ../libntp/libntp.a Makefile $(top_srcdir)/version env CSET=`cat $(top_srcdir)/version` $(top_builddir)/scripts/mkver ntpq $(COMPILE) -c version.c mkver is a shell script which uses the version number from packageinfo.sh, the repository revision from $CSET, and the current date/time to produce version.c. The dependency of version.o on Makefile, combined with the practice of the NTP build shell script of invoking config.status (which unconditionally regenerates Makefile) before make, means that a run of the build script always generates updated version.c files with the current timestamp, even if nothing else has changed. I am not responsible for inventing this scheme, and I may have missed an important part. Cheers, Dave Hart
Force a file to be compiled always
Hello, almost ten years ago there was a question in this mailing list how to force a source file to be compiled always. http://lists.gnu.org/archive/html/automake/2002-02/msg00099.html Unfortunately the solutions mentioned there seem not to work with me. My Makefile.am looks like this: --- lib_LTLIBRARIES = libMyLibrary.la libMyLibrary_la_SOURCES = MySourceFile.cpp \ MySourceFile.h --- and when I add the .PHONY-line I get this Makefile.am: --- lib_LTLIBRARIES = libMyLibrary.la .PHONY : MySourceFile.cpp libMyLibrary_la_SOURCES = MySourceFile.cpp \ MySourceFile.h --- When executing make I receive this error message: --- Build of configuration Default for project MeshingLib make -j install Making install in src make[1]: Entering directory `/home/bbihler/StarTeam/Bibliotheken/C++/TWTMeshingLib/build/debug/src' cd ../../.. /bin/sh /home/bbihler/StarTeam/Bibliotheken/C++/TWTMeshingLib/missing --run automake-1.9 --foreign src/Makefile cd .. /bin/sh ./config.status src/Makefile depfiles config.status: creating src/Makefile config.status: executing depfiles commands make[1]: Leaving directory `/home/bbihler/StarTeam/Bibliotheken/C++/TWTMeshingLib/build/debug/src' make[1]: Entering directory `/home/bbihler/StarTeam/Bibliotheken/C++/TWTMeshingLib/build/debug/src' if /bin/sh ../libtool --tag=CXX --mode=compile g++ -DHAVE_CONFIG_H -I. -I../../../src -I.. -I/home/bbihler/StarTeam/Bibliotheken/C++/Medina-Bibliotheken/include -I/home/bbihler/StarTeam/Bibliotheken/C++/Xerces/include -Wall -Wno-unknown-pragmas -fopenmp -g -O0 -DTWT_CHECKS -DTR1_CONTAINERS -MT MySourceFile.lo -MD -MP -MF .deps/MySourceFile.Tpo -c -o MySourceFile.lo MySourceFile.cpp; \ then mv -f .deps/MySourceFile.Tpo .deps/MySourceFile.Plo; else rm -f .deps/MySourceFile.Tpo; exit 1; fi g++ -DHAVE_CONFIG_H -I. -I../../../src -I.. -I/home/bbihler/StarTeam/Bibliotheken/C++/Medina-Bibliotheken/include -I/home/bbihler/StarTeam/Bibliotheken/C++/Xerces/include -Wall -Wno-unknown-pragmas -fopenmp -g -O0 -DTWT_CHECKS -DTR1_CONTAINERS -MT MySourceFile.lo -MD -MP -MF .deps/MySourceFile.Tpo -c MySourceFile.cpp -fPIC -DPIC -o .libs/MySourceFile.o g++: MySourceFile.cpp: Datei oder Verzeichnis nicht gefunden g++: no input files make[1]: *** [MySourceFile.lo] Fehler 1 make: *** [install-recursive] Fehler 1 make[1]: Leaving directory `/home/bbihler/StarTeam/Bibliotheken/C++/TWTMeshingLib/build/debug/src' --- Datei oder Verzeichnis nicht gefunden means File or directory not found. Is there any easy solution? Or can someone tell me what I have done wrong? Thank you very much, Benjamin Bihler
Force a file to be compiled always
Hello, almost ten years ago there was a question in this mailing list how to force a source file to be compiled always. http://lists.gnu.org/archive/html/automake/2002-02/msg00099.html Unfortunately the solutions mentioned there seem not to work with me. My Makefile.am looks like this: --- lib_LTLIBRARIES = libMyLibrary.la libMyLibrary_la_SOURCES = MySourceFile.cpp \ MySourceFile.h --- and when I add the .PHONY-line I get this Makefile.am: --- lib_LTLIBRARIES = libMyLibrary.la .PHONY : MySourceFile.cpp libMyLibrary_la_SOURCES = MySourceFile.cpp \ MySourceFile.h --- When executing make I receive this error message: --- Build of configuration Default for project MeshingLib make -j install Making install in src make[1]: Entering directory `/home/bbihler/StarTeam/Bibliotheken/C++/TWTMeshingLib/build/debug/src' cd ../../.. /bin/sh /home/bbihler/StarTeam/Bibliotheken/C++/TWTMeshingLib/missing --run automake-1.9 --foreign src/Makefile cd .. /bin/sh ./config.status src/Makefile depfiles config.status: creating src/Makefile config.status: executing depfiles commands make[1]: Leaving directory `/home/bbihler/StarTeam/Bibliotheken/C++/TWTMeshingLib/build/debug/src' make[1]: Entering directory `/home/bbihler/StarTeam/Bibliotheken/C++/TWTMeshingLib/build/debug/src' if /bin/sh ../libtool --tag=CXX --mode=compile g++ -DHAVE_CONFIG_H -I. -I../../../src -I.. -I/home/bbihler/StarTeam/Bibliotheken/C++/Medina-Bibliotheken/include -I/home/bbihler/StarTeam/Bibliotheken/C++/Xerces/include -Wall -Wno-unknown-pragmas -fopenmp -g -O0 -DTWT_CHECKS -DTR1_CONTAINERS -MT MySourceFile.lo -MD -MP -MF .deps/MySourceFile.Tpo -c -o MySourceFile.lo MySourceFile.cpp; \ then mv -f .deps/MySourceFile.Tpo .deps/MySourceFile.Plo; else rm -f .deps/MySourceFile.Tpo; exit 1; fi g++ -DHAVE_CONFIG_H -I. -I../../../src -I.. -I/home/bbihler/StarTeam/Bibliotheken/C++/Medina-Bibliotheken/include -I/home/bbihler/StarTeam/Bibliotheken/C++/Xerces/include -Wall -Wno-unknown-pragmas -fopenmp -g -O0 -DTWT_CHECKS -DTR1_CONTAINERS -MT MySourceFile.lo -MD -MP -MF .deps/MySourceFile.Tpo -c MySourceFile.cpp -fPIC -DPIC -o .libs/MySourceFile.o g++: MySourceFile.cpp: Datei oder Verzeichnis nicht gefunden g++: no input files make[1]: *** [MySourceFile.lo] Fehler 1 make: *** [install-recursive] Fehler 1 make[1]: Leaving directory `/home/bbihler/StarTeam/Bibliotheken/C++/TWTMeshingLib/build/debug/src' --- Datei oder Verzeichnis nicht gefunden means File or directory not found. Is there any easy solution? Or can someone tell me what I have done wrong? Thank you very much, Benjamin Bihler
Re: Force a file to be compiled always
Hi Benjamin, * Benjamin Bihler wrote on Wed, Nov 03, 2010 at 11:00:35AM CET: almost ten years ago there was a question in this mailing list how to force a source file to be compiled always. http://lists.gnu.org/archive/html/automake/2002-02/msg00099.html Unfortunately the solutions mentioned there seem not to work with me. My Makefile.am looks like this: --- lib_LTLIBRARIES = libMyLibrary.la libMyLibrary_la_SOURCES = MySourceFile.cpp \ MySourceFile.h --- and when I add the .PHONY-line I get this Makefile.am: --- lib_LTLIBRARIES = libMyLibrary.la .PHONY : MySourceFile.cpp libMyLibrary_la_SOURCES = MySourceFile.cpp \ MySourceFile.h --- I think for it to work you'd need something like: lib_LTLIBRARIES = libMyLibrary.la .PHONY : $(srcdir)/MySourceFile.cpp libMyLibrary_la_SOURCES = $(srcdir)/MySourceFile.cpp \ MySourceFile.h An alternative and more portable (to some non-GNU makes) way than marking targets as phony is letting them depend upon some non-existing pseudo target. It is comonly named FORCE, and you need to ensure no file with that name exists in the source or the build tree: lib_LTLIBRARIES = libMyLibrary.la MySourceFile.cpp: FORCE FORCE: libMyLibrary_la_SOURCES = MySourceFile.cpp \ MySourceFile.h An even better alternative however is to not lie to make about the actual dependency structure: why do you need your file to be compiled always? The answer to that question specifies what the file really should depend upon (e.g., upon Makefile?). Hope that helps. Cheers, Ralf
