[Buildroot] Buildroot compilation errors (libintl) in cygwin.

[Rex Ashbaugh]

Just an FYI to all those building a toolchain under cygwin..
The last time I built buildroot under cygwin, there was a particularly nasty
bug in which one of the uClibc libraries (*.so) was built incorrectly.
It was built with a mix of both static and dynamic functions, instead of
just the dynamic functions.
This happened because the build process used a filename twice, both with an
upper case *.S and lower case *.s suffix, but for different purposes. (I
can't remember which file it was now)
Because cygwin has case insensitivity, one file overwrote the other,
corrupting the build.
The failure was silent. There was no clue it was happening. I came across
the problem later when trying to build an app with the toolchain that made
use of the library, causing the app either to fail to build, or to crash at
runtime. This caused me alot of hair pulling.
Seeing no easy fix for this, I solved the problem by building the same
buildroot version under linux and copying the correctly built uClibc library
over to my cygwin toolchain.
If you absolutely need to build under cygwin, its not a bad strategy to
build under linux in parallel to gain understanding.

-Rex

On 7/18/07, Tom <fivemiletom at gmail.com> wrote:
>
> Gabbar Singh wrote:
> > Thanks a lot for the input Rex.
> > I did indeed add -lintl to the makefile and the error stopped. So every
> > place where there is any configuration happening, I need to change that
> > makefile.. correct ?
> > I had to make changes in two places to make it run.
>
> As Rex said, there were and are several places, some of which not
> directly in buildroot but in the extracted archives. Gabbar, if you can
> give us a list of all the places that you needed to fix for a more
> recent buildroot than the one I was talking about below, that would be
> appreciated.
>
> Thanks,
> Tom
>
>
> ---
> Hi Bernhard, All
>
> Enclosed is cygwin-1.patch for buildroot-20050524.tar.bz2.
>
> - requires cygwin 1.5.24 with development package
>
> - configure buildroot for arm, arm-generic, eabi, "pc-cygwin",
> uclibc-0.9.29, buildroot toolchain with gcc 4.1.2
>
> - FIRST do one build attempt (will fail, just to get and extract uclibc)
>
> - apply cygwin-1.patch with p1 (it is at very bottom of this email)
>
> - THEN do another build attempt, which will build
>    gmp, mpfr, newlib and arm-linux-uclibcgnueabi-gcc-4.1.2.exe
>    before failing (*).
>
> Thanks
> Tom
>
> PS: if someone could take care of the apple part, that would be great.
> Also, the one fix belongs to uclibc and not to buildroot...
>
>
> (*) it fails when cross compiling uclibc, maybe my UCLIBC options? Hints
> appreciated, need this to test on target.
>
> make MAKE="make -j1" -C /tw/buildroot/toolchain_build_arm/uClibc-0.9.29
> \
>                  PREFIX= \
>                  DEVEL_PREFIX=/ \
>                  RUNTIME_PREFIX=/ \
>                  HOSTCC="gcc" \
>                  all
> arm-linux-uclibcgnueabi-gcc: n: No such file or directory
> make[1]: Entering directory
> `/tw/buildroot/toolchain_build_arm/uClibc-0.9.29'
> arm-linux-uclibcgnueabi-gcc: n: No such file or directory
> make[2]: `conf' is up to date.
> arm-linux-uclibcgnueabi-gcc: n: No such file or directory
>    CC ldso/ldso/ldso.oS
> arm-linux-uclibcgnueabi-gcc: n: No such file or directory
> make[1]: *** [ldso/ldso/ldso.oS] Error 1
> make[1]: Leaving directory
> `/tw/buildroot/toolchain_build_arm/uClibc-0.9.29'
> make: *** [/tw/buildroot/toolchain_build_arm/uClibc-0.9.29/lib/libc.a]
> Error 2
>
>
>
>
>
> > On Fri, May 25, 2007 at 11:52:35PM -0700, Tom wrote:
> >> Hi Bernhard and all,
> >>
> >> sorry if this thread is a little out of sequence, had problems with
> text attachment.
> >>
> >> Bernhard Fischer wrote:
> >>> Before you report it to the mpfr folks, please paste the error here,
> >>> since i suspect that it could have to do something with the
> >>> binary/library name extensions, which (IIRC) we currently do not
> handle
> >>> at all (there's a bug somewhere about this, if memory serves me
> right).
> >>>
> >> You were right about extensions, below is the error as produced by
> >> buildroot-20050516 built, I just added -verbose for ld.
> >> It can not resolve the depency to libgmp.so, because cygwin ld
> assumes libs to end in .a, .lib or .dll, and will append them to .so
> libs, which thus can never be found.
> >> Can I help to add support for this?
> >
> > Yes, you can.
> >
> > Depending on the target, set
> > ifneq $($(findstring linux,$(BR2_GNU_BUILD_SUFFIX)),)
> > EXEEXT:=
> > LIBEXT:=.a
> > SHREXT:=.so
> > endif
> > ifneq $($(findstring apple,$(BR2_GNU_BUILD_SUFFIX)),)
> > EXEEXT:=.pear
> > LIBEXT:=.dunno
> > SHREXT:=.dylib
> > endif
> > ifneq $($(findstring cygwin,$(BR2_GNU_BUILD_SUFFIX)),)
> > EXEEXT:=.exe
> > LIBEXT:=.dunno
> > SHREXT:=.dll
> > endif
> > ifneq $($(findstring mingw,$(BR2_GNU_BUILD_SUFFIX)),)
> > EXEEXT:=.exe
> > LIBEXT:=.dunno
> > SHREXT:=.dll
> > endif
> >
> > in the toplevel Makefile, before the
> > all: world
> > target, and use them accordingly.
> >
> >
> > While you're at it, it would be awesome if you could deal with this too:
> > We want to be able to select which flavour of lib is built (shared or
> > static) with a single config-option.
> > So, instead of changing all ".so" blindly to $(SHREXT), change it to
> > $(LIBTGTEXT) which is set either to
> >
> > ifeq $($(BR2_DEFAULT_LIB_TARGET),shared)
> > LIBTGTEXT=$(SHREXT)
> > else
> > LIBTGTEXT=$(LIBEXT)
> > endif
> >
> > below the newly added block i mentioned above.
> >
> > TIA and cheers,
> >
>
>
> cygwin-1.patch:
>
> --- buildroot.orig/Makefile    2007-05-29 11:55:38.025317600 -0700
> +++ buildroot/Makefile    2007-05-29 19:54:26.130869700 -0700
> @@ -66,7 +66,32 @@
>   #
>   #############################################################
>
> +ifneq (,$(findstring linux,$(BR2_GNU_BUILD_SUFFIX)))
> +EXEEXT:=
> +LIBEXT:=.a
> +SHREXT:=.so
> +endif
> +ifneq (,$(findstring apple,$(BR2_GNU_BUILD_SUFFIX)))
> +EXEEXT:=.pear
> +LIBEXT:=.dunno
> +SHREXT:=.dylib
> +endif
> +ifneq (,$(findstring cygwin,$(BR2_GNU_BUILD_SUFFIX)))
> +EXEEXT:=.exe
> +LIBEXT:=.lib
> +SHREXT:=.dll
> +endif
> +ifneq (,$(findstring mingw,$(BR2_GNU_BUILD_SUFFIX)))
> +EXEEXT:=.exe
> +LIBEXT:=.lib
> +SHREXT:=.dll
> +endif
>
> +ifeq ($(BR2_PREFER_STATIC_LIB),y)
> +LIBTGTEXT=$(LIBEXT)
> +else
> +LIBTGTEXT=$(SHREXT)
> +endif
>
>   all:   world
>
> --- buildroot.orig/Config.in    2007-05-29 11:54:55.651131200 -0700
> +++ buildroot/Config.in    2007-05-29 19:39:05.976662000 -0700
> @@ -373,6 +373,19 @@
>       help
>         This option hides outdated/obsolete versions of packages.
>
> +config BR2_PREFER_STATIC_LIB
> +    bool "prefer static libraries"
> +    default n
> +    help
> +      Where possible, use static libraries.
> +      This increases your code size a lot and should only be
> +      used with a good reason why not use the default, which
> +      is dynamic libraries.
> +
> +      If unsure, say No.
> +
> +      WARNING: This is highly experimental at the moment.
> +
>   endmenu
>
>   source "toolchain/Config.in"
> --- buildroot.orig/package/gmp/gmp.mk    2007-05-29 11:56:19.118278600-0700
> +++ buildroot/package/gmp/gmp.mk    2007-05-29 19:34:47.184755900 -0700
> @@ -18,6 +18,18 @@
>   GMP_BE:=no
>   endif
>
> +ifeq ($(BR2_PREFER_STATIC_LIB),y)
> +GMP_LIB_FLAGS:=--enable-static --disable-shared
> +else
> +GMP_LIB_FLAGS:=--disable-static --enable-shared
> +endif
> +
> +ifeq ($(EXEEXT),".exe")
> +GMP_CPP_FLAGS:=-DDLL_EXPORT
> +else
> +GMP_CPP_FLAGS:=-DDLL_EXPORT
> +endif
> +
>   $(DL_DIR)/$(GMP_SOURCE):
>        $(WGET) -P $(DL_DIR) $(GMP_SITE)/$(GMP_SOURCE)
>
> @@ -35,6 +47,7 @@
>           $(TARGET_CONFIGURE_OPTS) \
>           CFLAGS="$(TARGET_CFLAGS)" \
>           LDFLAGS="$(TARGET_LDFLAGS)" \
> +        CPPFLAGS="$(GMP_CPP_FLAGS)" \
>           ac_cv_c_bigendian=$(GMP_BE) \
>           $(GMP_DIR)/configure \
>           --target=$(GNU_TARGET_NAME) \
> @@ -52,7 +65,7 @@
>           --includedir=/include \
>           --mandir=/usr/man \
>           --infodir=/usr/info \
> -        --enable-shared \
> +        $(GMP_LIB_FLAGS) \
>           $(DISABLE_NLS) \
>       );
>       touch $@
> @@ -105,12 +118,12 @@
>           CC_FOR_BUILD="$(HOSTCC)" \
>           CC="$(HOSTCC)" \
>           CFLAGS="$(HOST_CFLAGS)" \
> +        CPPFLAGS="$(GMP_CPP_FLAGS)" \
>           $(GMP_DIR)/configure \
>           --prefix="$(GMP_HOST_DIR)" \
>           --build=$(GNU_HOST_NAME) \
>           --host=$(GNU_HOST_NAME) \
> -        --enable-shared \
> -        --enable-static \
> +        $(GMP_LIB_FLAGS) \
>           $(DISABLE_NLS) \
>       );
>       touch $@
> ---
> buildroot.orig/toolchain_build_arm/uClibc-0.9.29/extra/config/Makefile
> 2007-04-17 04:38:21.000000000 -0700
> +++ buildroot/toolchain_build_arm/uClibc-0.9.29/extra/config/Makefile
> 2007-05-29 19:34:47.200380600 -0700
> @@ -21,7 +21,7 @@
>       $(HOSTCC) $(HOST_EXTRACFLAGS) $(HOSTCFLAGS) $(HOSTCFLAGS_$@)
> $(HOST_LOADLIBES) $< -o $@
>
>   $(host-cmulti): %: $(host-cobjs) $(host-cshlib)
> -    $(HOSTCC) $(HOST_EXTRACFLAGS) $(HOSTCFLAGS) $(HOSTCFLAGS_$@)
> $(HOST_LOADLIBES) $($@-objs) -o $@
> +    $(HOSTCC) $(HOST_EXTRACFLAGS) $(HOSTCFLAGS) $(HOSTCFLAGS_$@)
> $(HOST_LOADLIBES) $($@-objs) -lintl -o $@
>
>   $(host-cobjs): %.o: %.c
>       $(HOSTCC) $(HOST_EXTRACFLAGS) $(HOSTCFLAGS) $(HOSTCFLAGS_$@) -c $<
> -o $@
>
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