Terin Stock <terinjokes@gmail.com> writes:

MariaDB 5.3.5, 5.2.10 and possibly other versions, fails to compile using Apple's Clang compiler. As of Xcode 4.3, Clang is the default compiler, replacing LLVM-GCC.

The issue seems to occur when checking for an ABI incompatibility in mysql.h. As Clang preprocesses the file differently than GCC, the output is different, which fails the abi_check.

MariaDB compiles fine using the non-default LLVM-GCC compiler.

https://gist.github.com/1944688

+ /usr/bin/diff -w include/mysql.h.pp ./abi_check.out 3,4d2 < #include "mysql_version.h" < #include "mysql_com.h" 147d144 < #include "mysql_time.h" 160d156 < #include "my_list.h" 201,202d196 < #include "typelib.h" < #include "my_alloc.h" 242d235 < #include "my_alloc.h" It looks like Clang does not support the -dI switch. But this ABI check is only supposed to be activated when using GCC. From configure.in: if test "$GCC" != "yes" || expr "$CC" : ".*icc.*" then ABI_CHECK="" else ABI_CHECK="abi_check" fi The AC_PROG_CC macro sets $GCC to "yes" if it detects GCC. Could it be that Clang is lying to autoconf in Xcode 4.3, pretending to be GCC? Maybe it would be worth investigating, and filing a bug against Clang or Autoconf, if appropriate. But either way, it would be good to have a fix in MariaDB. I am not familiar with Clang/Xcode, but maybe you could suggest an extra check in the above configure.in snippet that could be used to detect that the compiler is really Clang? - Kristian.