Gcc error unrecognized command line option
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I am in the process of compiling VLC from source on Red Hat Enterprise Linux 7. When configuring VLC I get a message that states that I need ‘libmad’.
Downloaded the ‘libmad’ source code from ftp://ftp.mars.org/pub/mpeg/
So I unzip the ‘libmad’ code and run ./configure and there are no errors. When I run make I get an error about an unrecognized command line option.
What does this error mean? Is this just a typo perhaps? Ultimately I am building VLC from source and need this dependency to build the application. Does anybody know how to troubleshoot or fix this error?
When compiling with gcc 4.7.2 and autoconf 2.69, I am routinely getting results such as these in configure.log. Example:
The compilation proceeds successfully, but I am wondering why autoconf is testing for command lines that gcc does not support. Is this for other compilers?
2 Answers 2
gcc -V is a way of selecting a specific gcc version when you have more than one, that’s a decoy here though: configure is iterating through a set of options (–version -v -V etc.) to make sure it can log the version of the C compiler, be it gcc or something else.
gcc used to have a -V option for version reports. It now uses -v, and provides the configuration options used when the compiler was built.
You package is a bit dated and doesn’t reflect that fact.
BTW, the -qversion option was merged into the -v.
On some versions of gcc, the -V option tells it to use a specified version of the compiler — but it requires an argument. It’s documented here. The option appears to have been removed some time between 4.5.4 and 4.6.4.
