Compiling gcc trunk under cygwin

Compiling gcc trunk under cygwin

[David Wohlferd]

Until recently, I've been able to build gcc under cygwin just fine. But 
(relatively) recent checkins (232454 &  232071) are causing problems.  
I've been trying to track down what to do about them, but crawling thru 
the depths of makefiles, sed scripts, etc is proving difficult for this 
long-time Windows programmer.  But I do have some clues.

The problems all seem to revolve around __GXX_WEAK__.

I notice that cygwin's current (and experimental 5.2.0) builds of gcc 
don't define __GXX_WEAK__.  After reading this 
(https://cygwin.com/ml/cygwin/2010-04/msg00281.html), that makes sense.  
And that's fine by me, I don't need it anyway.

But during the building of gcc, the xgcc that gets built *does* define 
it.  And with these new changes, that leads to errors like this:

../src/c++11/.libs/libc++11convenience.a(cow-stdexcept.o): In function 
`_txnal_cow_string_C1_for_exceptions(void*, char const*, void*)':
/cygdrive/c/cygwin64/src/gcc-trunk/libstdc++-v3/src/c++11/cow-stdexcept.cc:236:(.text$_Z35_txnal_cow_string_C1_for_exceptionsPvPKcS_+0x2c): 
relocation truncated to fit: R_X86_64_PC32 against undefined symbol 
`_ITM_RU1'
/cygdrive/c/cygwin64/src/gcc-trunk/libstdc++-v3/src/c++11/cow-stdexcept.cc:248:(.text$_Z35_txnal_cow_string_C1_for_exceptionsPvPKcS_+0x39): 
relocation truncated to fit: R_X86_64_PC32 against undefined symbol 
`transaction clone for operator
new[](unsigned long)'
/cygdrive/c/cygwin64/src/gcc-trunk/libstdc++-v3/src/c++11/cow-stdexcept.cc:267:(.text$_Z35_txnal_cow_string_C1_for_exceptionsPvPKcS_+0x5d): 
relocation truncated to fit: R_X86_64_PC32 against undefined symbol 
`_ITM_memcpyRtWn'
../src/c++11/.libs/libc++11convenience.a(cow-stdexcept.o): In function 
`txnal_read_ptr':
/cygdrive/c/cygwin64/src/gcc-trunk/libstdc++-v3/src/c++11/cow-stdexcept.cc:278:(.text$_Z23_txnal_cow_string_c_strPKv+0x1): 
relocation truncated to fit: R_X86_64_PC32 against undefined symbol 
`_ITM_RU8'
/cygdrive/c/cygwin64/src/gcc-trunk/libstdc++-v3/src/c++11/cow-stdexcept.cc:278:(.text$_Z23_txnal_sso_string_c_strPKv+0x1): 
relocation truncated to fit: R_X86_64_PC32 against undefined symbol 
`_ITM_RU8'
/cygdrive/c/cygwin64/src/gcc-trunk/libstdc++-v3/src/c++11/cow-stdexcept.cc:278:(.text$_Z20_txnal_cow_string_D1Pv+0x5): 
relocation truncated to fit: R_X86_64_PC32 against undefined symbol 
`_ITM_RU8'
../src/c++11/.libs/libc++11convenience.a(cow-stdexcept.o): In function 
`_txnal_cow_string_D1(void*)':
/cygdrive/c/cygwin64/src/gcc-trunk/libstdc++-v3/src/c++11/cow-stdexcept.cc:324:(.text$_Z20_txnal_cow_string_D1Pv+0x1e): 
relocation truncated to fit: R_X86_64_PC32 against undefined symbol 
`_ITM_addUserCommitAction'
../src/c++11/.libs/libc++11convenience.a(cow-stdexcept.o): In function 
`transaction clone for std::logic_error::logic_error(char const*)':
/cygdrive/c/cygwin64/src/gcc-trunk/libstdc++-v3/src/c++11/cow-stdexcept.cc:408:(.text$_ZGTtNSt11logic_errorC1EPKc+0x2e): 
relocation truncated to fit: R_X86_64_PC32 against undefined symbol 
`_ITM_memcpyRnWt'
../src/c++11/.libs/libc++11convenience.a(cow-stdexcept.o): In function 
`transaction clone for 
std::logic_error::logic_error(std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const&)':
/cygdrive/c/cygwin64/src/gcc-trunk/libstdc++-v3/src/c++11/cow-stdexcept.cc:408:(.text$_ZGTtNSt11logic_errorC1ERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE+0x2e): 
relocation truncated to fit: R_X86_64_PC32 against undefined symbol
`_ITM_memcpyRnWt'
../src/c++11/.libs/libc++11convenience.a(cow-stdexcept.o): In function 
`txnal_read_ptr':
/cygdrive/c/cygwin64/src/gcc-trunk/libstdc++-v3/src/c++11/cow-stdexcept.cc:278:(.text$_ZGTtNSt11logic_errorC1ERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE+0x36): 
relocation truncated to fit: R_X86_64_PC32 against undefined symbol
`_ITM_RU8'
../src/c++11/.libs/libc++11convenience.a(cow-stdexcept.o): In function 
`transaction clone for std::logic_error::~logic_error()':
/cygdrive/c/cygwin64/src/gcc-trunk/libstdc++-v3/src/c++11/cow-stdexcept.cc:408:(.text$_ZGTtNSt11logic_errorD0Ev+0x1a): 
additional relocation overflows omitted from the output

I can fix the errors and get my build working again by:
a) adding "#define __GXX_WEAK__ 0" to the top of cow-stdexcept.cc
b) commenting out the undef and define of MAKE_DECL_ONE_ONLY in cygming.h

But there's got to be a better way.

Is there some configure option I'm supposed to be using when building 
gcc for cygwin?  How else could your 5.2.0 not be defining 
__GXX_WEAK__?  Looking at the configure options in gcc -v isn't showing 
me anything that looks like a solution.

dw

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Re: Compiling gcc trunk under cygwin

[Roger Orr]

David Wohlferd <dw <at> LimeGreenSocks.com> writes:

> Until recently, I've been able to build gcc under cygwin just fine. But 
> (relatively) recent checkins (232454 &  232071) are causing problems.

Have you reported the problems with 232454 to gcc yet?

I've already reported the 232071 problem, on the original bug report this
was trying to fix. See gcc's bugzilla:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66655
 
Roger.


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RE: Compiling gcc trunk under cygwin

[Roger Orr]

FYI
(1) Revision 232071 problem

The pr66655 has a new proposed patch, which does appear to build on cygwin,
and is awaiting final approval.

See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66655

(2) Revision 232454 problem

I've now reported the revision 232454 problem as pr69506 (as it's been well
over a week since the problematic check-in)

See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69506

Regards,
Roger.

-----Original Message-----
From: Roger Orr [mailto:rogero@howzatt.demon.co.uk] 
Sent: 23 January 2016 14:19
To: cygwin@cygwin.com
Subject: Re: Compiling gcc trunk under cygwin

David Wohlferd <dw <at> LimeGreenSocks.com> writes:

> Until recently, I've been able to build gcc under cygwin just fine. But 
> (relatively) recent checkins (232454 &  232071) are causing problems.

Have you reported the problems with 232454 to gcc yet?

I've already reported the 232071 problem, on the original bug report this
was trying to fix. See gcc's bugzilla:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66655
 
Roger.



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RE: Compiling gcc trunk under cygwin

[Roger Orr]

FYI
Fixes for both issues now released to gcc trunk.
Roger.

-----Original Message-----
From: Roger Orr [mailto:rogero@howzatt.demon.co.uk] 
Sent: 27 January 2016 00:16
To: 'cygwin@cygwin.com'
Subject: RE: Compiling gcc trunk under cygwin

FYI
(1) Revision 232071 problem

The pr66655 has a new proposed patch, which does appear to build on cygwin,
and is awaiting final approval.

See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66655

(2) Revision 232454 problem

I've now reported the revision 232454 problem as pr69506 (as it's been well
over a week since the problematic check-in)

See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69506

Regards,
Roger.

-----Original Message-----
From: Roger Orr [mailto:rogero@howzatt.demon.co.uk] 
Sent: 23 January 2016 14:19
To: cygwin@cygwin.com
Subject: Re: Compiling gcc trunk under cygwin

David Wohlferd <dw <at> LimeGreenSocks.com> writes:

> Until recently, I've been able to build gcc under cygwin just fine. But 
> (relatively) recent checkins (232454 &  232071) are causing problems.

Have you reported the problems with 232454 to gcc yet?

I've already reported the 232071 problem, on the original bug report this
was trying to fix. See gcc's bugzilla:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66655
 
Roger.



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