macOS How to build libusb in mac i386?

[MayPeng]

I download libusb-1.0.8 from sourceForge net. It is installed as x86_64 by default. But I need it to install as i386 .How can i do?
ps. My mac doesn't support 64bit kernel and Extensions.

 

[jiminaus]

The -arch command-line switch to GCC selects which architectures are to be targeted when compiling. -arch x86_64 will compile 64-bit. -arch i386 will compile 32-bit.

Try exporting a CFLAGS environment variable before running configure.

[b]$[/b] export CFLAGS='-arch i386'
[b]$[/b] ./configure

 

[larkost]

There is a good chance you will need LDFLAGS set to the same thing. And depending on the makefile you might need other flags for C++ sources.

 

[MayPeng]

The -arch command-line switch to GCC selects which architectures are to be targeted when compiling. -arch x86_64 will compile 64-bit. -arch i386 will compile 32-bit.

Try exporting a CFLAGS environment variable before running configure.

[b]$[/b] export CFLAGS='-arch i386'
[b]$[/b] ./configure

Resolve the problem.Thank you!
But mac pc must support '64bit kernel and extensions', or set CFLAGS = i386 ,it still installs as x86_64.