#7779: OpenJDK-1.8.0.92
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Reporter: pierre.labastie | Owner: pierre.labastie
Type: enhancement | Status: assigned
Priority: normal | Milestone: 7.10
Component: BOOK | Version: SVN
Severity: normal | Resolution:
Keywords: |
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Comment (by pierre.labastie):
Trying to summarize the issues with GCC 6:
- All the compilations using g++ need ''-std=c++98'', ''-fno-delete-null-
pointer-checks'', and ''-fno-lifetime-dse'', while those using gcc
sometimes need ''-fno-delete-null-pointer-checks'' and ''-fno-lifetime-
dse''. See [http://hg.openjdk.java.net/jdk9/dev/rev/9d77f922d694]. Problem
is the build system does not honor the CC and CXX variables.
- There are options ''--with-extra-cflags'' and ''--with-extra-cxxflags'',
which can be passed to configure, but the '''hotspot''' build system uses
extra-cflags as flags for g++. So ''-std=c++98'' has to be added to the
extra-cflags. But then, when used as flags for gcc, it generates a
warning, and because ''-Werror'' is used, it becomes an error and stops
the build. So the right combination for extra-cflags is ''-std=c++98 -fno-
delete-null-pointer-checks -fno-lifetime-dse -Wno-error''.
- That is not enough. During the build of '''jdk''', there is a make
variable, which is passed for some compilations:
{{{
SCTP_ERROR := -Werror -Wno-error=unused-parameter
}}}
and $(SCTP_ERROR) is inserted after the extra-cflags, so the effect of
''-Wno-error'' is lost, and the build fails at this point.
There is a srpm in fedora rawhide
(java-1.8.0-openjdk-1.8.0.91-3.b14.fc25.src.rpm), which has:
{{{
EXTRA_CFLAGS="%ourcppflags -std=gnu++98 -Wno-error -fno-delete-null-
pointer-checks -fno-lifetime-dse"
EXTRA_CPP_FLAGS="%ourcppflags -std=gnu++98 -fno-delete-null-pointer-checks
-fno-lifetime-dse"
[...]
bash configure \
[...]
--with-extra-cxxflags="$EXTRA_CPP_FLAGS" \
--with-extra-cflags="$EXTRA_CFLAGS"
[...]
make [...] SCTP_ERROR=
}}}
With those instructions added to the book, the build goes to completion. I
need to run the tests now.
--
Ticket URL: <http://wiki.linuxfromscratch.org/blfs/ticket/7779#comment:2>
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