On Aug 12, 2013, at 8:58 AM, Martin Ward wrote:
On 12/08/13 06:07, William Harrington wrote:
Greetings devs,
We have a slight problem in gcc temp system:
g++ -c -g -O2 -DIN_GCC -fno-exceptions -fno-rtti -fasynchronous-
unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -
Wmissing-format-attribute -pedantic -Wno-long-long -Wno-variadic-
macros -Wno-overlength-strings -DHAVE_CONFIG_H -DGENERATOR_FILE -I.
-Ibuild -I../../gcc-4.8.1/gcc -I../../gcc-4.8.1/gcc/build -I../../
gcc-4.8.1/gcc/../include -I../../gcc-4.8.1/gcc/../libcpp/include -I/
cross-tools/include -I/cross-tools/include -I/cross-tools/include -
I../../gcc-4.8.1/gcc/../libdecnumber -I../../gcc-4.8.1/gcc/../
libdecnumber/dpd -I../libdecnumber -I../../gcc-4.8.1/gcc/../
libbacktrace -DCLOOG_INT_GMP -I/cross-tools/include -I/cross-tools/
include \
-o build/genconstants.o ../../gcc-4.8.1/gcc/
genconstants.c
cc1plus: error: unrecognized command line option "-Wno-narrowing"
cc1plus: error: unrecognized command line option "-Wno-overlength-
strings"
The host compiler is used to create some host build tools for the
gcc build.
Thus, it'll run g++ which will be the host's gcc.
I was using the updated lfs livecd I recently put linux 3.10.5
onto, and it seems moving to gcc-4.8.1 we have Wno error checking
going bad.
The following dialect options are only available starting with gcc
4.7:
-Wno-narrowing and -Wno-overlength-strings
This is going to cause some problems with hosts using GCC < 4.7.
In config/warnings.m4 there is this change that is already in gcc
4.8.1:
for real_option in $1; do
# Do the check with the no- prefix removed since gcc silently
# accepts any -Wno-* option on purpose
case $real_option in
- -Wno-*) option=-W`expr $real_option : '-Wno-\(.*\)'` ;;
+ -Wno-*) option=-W`expr x$real_option : 'x-Wno-\(.*\)'` ;;
*) option=$real_option ;;
esac
I tried the old Wno line but it didn't help.
Any ideas how we will get past this?
We can remove -Wno-narrowing and -Wno-overlength-strings from gcc/
Makefile
Upping the host system requirements to gcc 4.7 is a bit extreme.
Sincerely,
WIlliam Harrington
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Hmm just run through two builds, because i forgot the specs path
when compiling the final gcc and never ran into that
I do remember seeing the line but is was as a warning, rather than
and error, how about having
|--disable-werror added?|
martin
It was supposed to be fixed by now but it isn't. If the host compiler
does not support Wno-narrowing or Wno-overlength-strings then the
build will fail. In my case, I'm using the updated livecd, which uses
GCC-4.1.2 and meets our host system requirements.
I found this which fixes the problem.
https://github.com/openembedded/oe-core/blob/master/meta/recipes-devtools/gcc/gcc-4.8/0038-gcc-4.8-build-args.patch
It looks we are going to need this or see if it is applied upstream.
It is going to be an issue.
Sincerely,
William Harrington
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