Autogen.sh looks for the libtool command as a mean to check if
libtool is available. But distributions like Debian and Ubuntu have
split the libtool package, and the libtool script is now in a
separate package. The solution is to look for the libtoolize command
too before failing, which is what the Autotools chain actually needs
on Linux. Keep checking for libtool to be compatible with OSX, where
the opposite is true.
- Added a macro for checking clang compiler
- Moved basic compiler checks to a macro
- Added a macro for checking if compiler supports a flag
- Added --enable-debug flag
- Added a macro for running normal autoconf check with compiler flags
- Added a macro for checking for verbose flag for different compilers (-Wall)
- Added a macro for turning on strict standards compliance
- Added a macro for turning warnings to errors
- Added a macro for checking if compiler supports given pragma
- Most of the flags now go through checks if the compilers supports them
rather than enumerating different compilers
- Added DSO symbol visibility for sun compiler
- Enabled verbose mode for sun compiler
- Fixed build for ICC 12.x by adding -wd279 to size_t checks
- Removed pkg-config checks as those don't seem to be used anywhere
Signed-off-by: Mikko Koppanen <mkoppanen@php.net>
