# RE: [PATCH v2] Support non-WIN32 system lacking poll() while keeping the WIN32 part intact 5 messages from 2012-08-24 to 2012-09-04. Participants: Joachim Schmitz, Junio C Hamano. Thread: https://gitlist.dev/t/31345 ## Joachim Schmitz, 2012-08-24 13:05 Subject: RE: [PATCH v2] Support non-WIN32 system lacking poll() while keeping the WIN32 part intact Message-ID: <004001cd81f9$21e68e10$65b3aa30$@schmitz-digital.de> URL: https://gitlist.dev/e/004001cd81f9%2421e68e10%2465b3aa30%24%40schmitz-digital.de ``` > From: Joachim Schmitz [mailto:jojo@schmitz-digital.de] > Sent: Friday, August 24, 2012 11:45 AM > To: Junio C Hamano (gitster@pobox.com) > Cc: git@vger.kernel.org; Erik Faye-Lund (kusmabite@gmail.com) > Subject: [PATCH v2] Support non-WIN32 system lacking poll() while keeping the WIN32 part intact > > > Signed-off-by: Joachim Schmitz > --- > This time I hopefully didn't screw up whitespace and line breaks. > > Makefile | 18 ++++++++++++++---- > compat/win32/poll.c | 8 ++++++-- > 2 files changed, 20 insertions(+), 6 deletions(-) > > diff --git a/Makefile b/Makefile > index 66e8216..e150816 100644 > --- a/Makefile > +++ b/Makefile > @@ -152,6 +152,11 @@ all:: > # > # Define NO_MMAP if you want to avoid mmap. > # > +# Define NO_SYS_POLL_H if you don't have sys/poll.h. > +# > +# Define NO_POLL if you do not have or do not want to use poll. > +# This also implies NO_SYS_POLL_H. > +# > # Define NO_PTHREADS if you do not have or do not want to use Pthreads. > # > # Define NO_PREAD if you have a problem with pread() system call (e.g. > @@ -1216,7 +1221,7 @@ ifeq ($(uname_S),Windows) > NO_PREAD = YesPlease > NEEDS_CRYPTO_WITH_SSL = YesPlease > NO_LIBGEN_H = YesPlease > - NO_SYS_POLL_H = YesPlease > + NO_POLL = YesPlease > NO_SYMLINK_HEAD = YesPlease > NO_IPV6 = YesPlease > NO_UNIX_SOCKETS = YesPlease > @@ -1257,7 +1262,7 @@ ifeq ($(uname_S),Windows) > BASIC_CFLAGS = -nologo -I. -I../zlib -Icompat/vcbuild -Icompat/vcbuild/include -DWIN32 -D_CONSOLE -DHAVE_STRING_H - > D_CRT_SECURE_NO_WARNINGS -D_CRT_NONSTDC_NO_DEPRECATE > COMPAT_OBJS = compat/msvc.o compat/winansi.o \ > compat/win32/pthread.o compat/win32/syslog.o \ > - compat/win32/poll.o compat/win32/dirent.o > + compat/win32/dirent.o > COMPAT_CFLAGS = -D__USE_MINGW_ACCESS -DNOGDI -DHAVE_STRING_H -DHAVE_ALLOCA_H -Icompat -Icompat/regex - > Icompat/win32 -DSTRIP_EXTENSION=\".exe\" > BASIC_LDFLAGS = -IGNORE:4217 -IGNORE:4049 -NOLOGO -SUBSYSTEM:CONSOLE -NODEFAULTLIB:MSVCRT.lib > EXTLIBS = user32.lib advapi32.lib shell32.lib wininet.lib ws2_32.lib > @@ -1312,7 +1317,7 @@ ifneq (,$(findstring MINGW,$(uname_S))) > NO_PREAD = YesPlease > NEEDS_CRYPTO_WITH_SSL = YesPlease > NO_LIBGEN_H = YesPlease > - NO_SYS_POLL_H = YesPlease > + NO_POLL = YesPlease > NO_SYMLINK_HEAD = YesPlease > NO_UNIX_SOCKETS = YesPlease > NO_SETENV = YesPlease > @@ -1347,7 +1352,7 @@ ifneq (,$(findstring MINGW,$(uname_S))) > COMPAT_CFLAGS += -DSTRIP_EXTENSION=\".exe\" > COMPAT_OBJS += compat/mingw.o compat/winansi.o \ > compat/win32/pthread.o compat/win32/syslog.o \ > - compat/win32/poll.o compat/win32/dirent.o > + compat/win32/dirent.o > EXTLIBS += -lws2_32 > PTHREAD_LIBS = > X = .exe > @@ -1601,6 +1606,11 @@ ifdef NO_GETTEXT > BASIC_CFLAGS += -DNO_GETTEXT > USE_GETTEXT_SCHEME ?= fallthrough > endif > +ifdef NO_POLL > + NO_SYS_POLL_H = YesPlease > + COMPAT_CFLAGS += -DNO_POLL -Icompat/win32 # so it finds poll.h > + COMPAT_OBJS += compat/win32/poll.o > +endif > ifdef NO_STRCASESTR > COMPAT_CFLAGS += -DNO_STRCASESTR > COMPAT_OBJS += compat/strcasestr.o > diff --git a/compat/win32/poll.c b/compat/win32/poll.c > index 403eaa7..49541f1 100644 > --- a/compat/win32/poll.c > +++ b/compat/win32/poll.c > @@ -24,7 +24,9 @@ > # pragma GCC diagnostic ignored "-Wtype-limits" > #endif > > -#include > +#if defined(WIN32) > +# include > +#endif > > #include > > @@ -48,7 +50,9 @@ > #else > # include > # include > -# include > +# ifndef NO_SYS_SELECT_H > +# include > +# endif > # include > #endif > > -- > 1.7.12 There is a downside with this: In order to make use of it, in Makefile it adds "-Icompat/win32" to COMPAR_CFLAGS. This results in compat/win32/dirent.h to be found, rather than /usr/include/dirent.h. This should be fine for WIN32, but for everybody else may not. For HP NonStop in particular it results in a warning: }; ^ "... /compat/win32/dirent.h", line 17: warning(133): expected an identifier And this is because there it uses an unnamed union, which is a GCC extension (just like unnamed struct), but not part of C89/C99/POSIX. One possible solution might be to move compat/win32/poll.[ch] to compat/. Another is to just ignore the warning, at least here it seems to work just fine? Or to avoid using an unnamed union. But the later 2 cases would still mean that we include the wrong dirent.h, so the 1st solution seems the cleanest. Any other idea? Let me know your thoughts... Bye, Jojo ``` ## Junio C Hamano, 2012-08-24 16:07 Subject: Re: [PATCH v2] Support non-WIN32 system lacking poll() while keeping the WIN32 part intact Message-ID: <7vsjbc1dg1.fsf@alter.siamese.dyndns.org> URL: https://gitlist.dev/e/7vsjbc1dg1.fsf%40alter.siamese.dyndns.org In-Reply-To: <004001cd81f9$21e68e10$65b3aa30$@schmitz-digital.de> ``` "Joachim Schmitz" writes: > There is a downside with this: In order to make use of it, in Makefile it > adds "-Icompat/win32" to COMPAR_CFLAGS. This results in > compat/win32/dirent.h to be found, rather than /usr/include/dirent.h. > This should be fine for WIN32, but for everybody else may not. > For HP NonStop in particular it results in a warning: > > }; > ^ > "... /compat/win32/dirent.h", line 17: warning(133): expected an identifier > > And this is because there it uses an unnamed union, which is a GCC extension > (just like unnamed struct), but not part of C89/C99/POSIX. > > One possible solution might be to move compat/win32/poll.[ch] to compat/. I think that is the most sensible way to go, because poll.[ch] (1) has proven itself to be useful outside the context of win32, and (2) the code is coming from gnulib anyway. I thought I already suggested going that route in my previous review, but perhaps I forgot to do so. ``` ## Joachim Schmitz, 2012-08-24 18:58 Subject: RE: [PATCH v2] Support non-WIN32 system lacking poll() while keeping the WIN32 part intact Message-ID: <005401cd822a$67687a30$36396e90$@schmitz-digital.de> URL: https://gitlist.dev/e/005401cd822a%2467687a30%2436396e90%24%40schmitz-digital.de In-Reply-To: <7vsjbc1dg1.fsf@alter.siamese.dyndns.org> ``` > From: Junio C Hamano [mailto:gitster@pobox.com] > Sent: Friday, August 24, 2012 6:07 PM > To: Joachim Schmitz > Cc: git@vger.kernel.org; Erik Faye-Lund > Subject: Re: [PATCH v2] Support non-WIN32 system lacking poll() while keeping the WIN32 part intact > > "Joachim Schmitz" writes: > > > There is a downside with this: In order to make use of it, in Makefile it > > adds "-Icompat/win32" to COMPAR_CFLAGS. This results in > > compat/win32/dirent.h to be found, rather than /usr/include/dirent.h. > > This should be fine for WIN32, but for everybody else may not. > > For HP NonStop in particular it results in a warning: > > > > }; > > ^ > > "... /compat/win32/dirent.h", line 17: warning(133): expected an identifier > > > > And this is because there it uses an unnamed union, which is a GCC extension > > (just like unnamed struct), but not part of C89/C99/POSIX. > > > > One possible solution might be to move compat/win32/poll.[ch] to compat/. > > I think that is the most sensible way to go, because poll.[ch] > > (1) has proven itself to be useful outside the context of win32, and > (2) the code is coming from gnulib anyway. > > I thought I already suggested going that route in my previous > review, but perhaps I forgot to do so. No, I believe you did, but I had forgotten about it. Could/should that be a 2nd patch? Or a v3 of this one? Different, but related question: would poll.[ch] be allowed to #include "git-compat-util.h"? Bye, Jojo ``` ## Junio C Hamano, 2012-08-24 19:46 Subject: Re: [PATCH v2] Support non-WIN32 system lacking poll() while keeping the WIN32 part intact Message-ID: <7vboi0yswz.fsf@alter.siamese.dyndns.org> URL: https://gitlist.dev/e/7vboi0yswz.fsf%40alter.siamese.dyndns.org In-Reply-To: <005401cd822a$67687a30$36396e90$@schmitz-digital.de> ``` "Joachim Schmitz" writes: > Different, but related question: would poll.[ch] be allowed to #include "git-compat-util.h"? Seeing other existing generic wrappers directly under compat/, e.g. fopen.c, mkdtemp.c, doing so, I would say why not. Windows folks (I see Erik is already CC'ed, which is good ;-), please work with Joachim to make sure such a move won't break your builds. I believe that it should just be the matter of updating a couple of paths in the top-level Makefile. Thanks. ``` ## Joachim Schmitz, 2012-09-04 11:49 Subject: RE: [PATCH v2] Support non-WIN32 system lacking poll() while keeping the WIN32 part intact Message-ID: <002701cd8a93$50773e30$f165ba90$@schmitz-digital.de> URL: https://gitlist.dev/e/002701cd8a93%2450773e30%24f165ba90%24%40schmitz-digital.de In-Reply-To: <7vboi0yswz.fsf@alter.siamese.dyndns.org> ``` > From: Junio C Hamano [mailto:gitster@pobox.com] > Sent: Friday, August 24, 2012 9:47 PM > To: Joachim Schmitz > Cc: git@vger.kernel.org; 'Erik Faye-Lund' > Subject: Re: [PATCH v2] Support non-WIN32 system lacking poll() while keeping the WIN32 part intact > > "Joachim Schmitz" writes: > > > Different, but related question: would poll.[ch] be allowed to #include "git-compat-util.h"? > > Seeing other existing generic wrappers directly under compat/, > e.g. fopen.c, mkdtemp.c, doing so, I would say why not. > > Windows folks (I see Erik is already CC'ed, which is good ;-), > please work with Joachim to make sure such a move won't break your > builds. I believe that it should just be the matter of updating a > couple of paths in the top-level Makefile. Haven't heard anything from the Windows folks yet. I'd prefer to move compat/win32/poll.[ch] into compat/poll. Then adjust a few paths in Makefile and that would be the 1st patch A 2nd patch would be my already proposed ones that make this usable for others (me in this case ;-)), namely wrapping 2 #inludes. diff --git a/compat/poll/poll.c b/compat/poll/poll.c index 403eaa7..49541f1 100644 --- a/compat/poll/poll.c +++ b/compat/poll/poll.c @@ -24,7 +24,9 @@ # pragma GCC diagnostic ignored "-Wtype-limits" #endif -#include +#if defined(WIN32) +# include +#endif #include @@ -48,7 +50,9 @@ #else # include # include -# include +# ifndef NO_SYS_SELECT_H +# include +# endif # include #endif -- 1.7.12 ```