http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58572
Bug ID: 58572
Summary: [4.9 regression] make install uses -Wno-narrowing with
system compiler which does not know about it
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: bootstrap
Assignee: unassigned at gcc dot gnu.org
Reporter: gerald at pfeifer dot com
Created attachment 30926
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30926&action=edit
Build log for a non-parallel build and install that shows the failure
On i386-unknown-freebsd10.0, amd64-unknown-freebsd8.3, and I assume any
system that has a sufficiently old version of GCC as the system compiler
installation now fails as follows:
gmake[2]: Entering directory `/scratch/tmp/gerald/OBJ-0927-1848/gcc'
g++ -c -DIN_GCC_FRONTEND -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 -Werror -fno-common
-DHAVE_CONFIG_H -I. -Ic -I/scratch/tmp/gerald/gcc-HEAD/gcc ...[-I
options]...
-o c/c-lang.o -MT c/c-lang.o -MMD -MP -MF c/.deps/c-lang.TPo
/scratch/tmp/gerald/gcc-HEAD/gcc/c/c-lang.c
cc1plus: error: unrecognized command line option "-Wno-narrowing"
gmake[2]: *** [c/c-lang.o] Error 1
gmake[1]: *** [install-gcc] Error 2
gmake: *** [install] Error 2
g++ here is GCC 4.2 which does not know about -Wnarrowing.
And configuring for and building stage 1 we correctly identify that
checking whether gcc supports -Wnarrowing... no
and this flag was not used during stage 1.
This works until and including r202892 | law | 2013-09-25 15:33:34.
