http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57059
Bug #: 57059
Summary: Host configuration of loose_warn breaks for build
components for Canadian crosses
Classification: Unclassified
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: bootstrap
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: rmansfi...@qnx.com
When the building a canadian cross with a build compiler that is gcc 4.6 or
older, the build cannot compile the build tools as configure will detect that
the cross compiler has support for -Wno-narrowing, and will try to pass it
along in the BUILD_CXXFLAGS. e.g.
g++ -c -DIN_GCC -DCROSS_DIRECTORY_STRUCTURE -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 -I../../gcc/build -I../../gcc/../include
-I../../gcc/../libcpp/include -I../../gcc/../libdecnumber
-I../../gcc/../libdecnumber/dpd -I../libdecnumber -I../../gcc/../libbacktrace
\
-o build/genconstants.o ../../gcc/genconstants.c
cc1plus: error: unrecognized command line option "-Wno-narrowing"
make[3]: *** [build/genconstants.o] Error 1
$ grep acx_cv_prog_cc_warning__Wnarrowing gcc/config.log
acx_cv_prog_cc_warning__Wnarrowing=yes
