Gilles Espinasse
2007-Feb-22 19:49 UTC
[syslinux] gcc_ok fail to detect unrecognized option
Even with gcc-4.1.1, gcc does not return an error if an option is not supported It just ouput a message to stderr but does not return a value different from 0. The result is that there is some warnings about every unrecognized option and compilation continue. barton syslinux-3.36 # gcc -dumpversion 4.1.1 barton syslinux-3.36 # gcc -ZZZ dummy.c; echo $? gcc: unrecognized option '-ZZZ' 0 barton syslinux-3.36 # gcc -Wall dummy.c; echo $? 0 On a command line, this line work if gcc $(1) -c -x c /dev/null 2>&1 | grep 'unrecognized option'; then echo $(2); else echo $(1); fi On a makefile, this pipe usage is not supported. As a notice, -### could be used instead of -c -x c /dev/null to test option validity. Gilles