build: DEBUG build with clang in FreeBSD fails

[santigimeno]

Output:

gmake[1]: Entering directory '/usr/home/sgimeno/node/io.js/out'
  c++ '-DDEBUG' '-D_DEBUG' -I../deps/gtest -I../deps/gtest/include  -pthread -Wall -Wextra -Wno-unused-parameter -m64 -Wno-missing-field-initializers -g -Og -fno-rtti -fno-exceptions -std=gnu++0x -MMD -MF /usr/home/sgimeno/node/io.js/out/Debug/.deps//usr/home/sgimeno/node/io.js/out/Debug/obj.target/gtest/deps/gtest/src/gtest-death-test.o.d.raw  -c -o /usr/home/sgimeno/node/io.js/out/Debug/obj.target/gtest/deps/gtest/src/gtest-death-test.o ../deps/gtest/src/gtest-death-test.cc
error: invalid integral value 'g' in '-Og'
error: invalid integral value 'g' in '-Og'

clang version:

FreeBSD clang version 3.4.1 (tags/RELEASE_34/dot1-final 208032) 20140512

It looks like clang does not support debug-safe optimizations with -Og introduced in #1569. See: https://llvm.org/bugs/show_bug.cgi?id=20765. Some workarounds are proposed there.

[Fishrock123]

This doesn't seem so good.

@bnoordhuis maybe we can make it an option to use -Og?

[bnoordhuis]

Fixed by e67542a.

[santigimeno]

Still getting the same error. It looks like the clang variable is not set