Hi Marty, Looks like 2.95.x treats it as an error (attempting to define a 0-length identifier), but 3.x and 4.x accept it. Notice this effect: touch test.cpp g++ -E -dM -D=FOO\ 3 test.cpp | grep FOO In 3.x and 4.x: #define FOO 3 Hmm! Reading the documentation carefully, it appears that: -DFOO -DFOO=3 is preferred, and -D FOO -D FOO=3 is acceptable. At least with 3.x and 4.x. I'm willing to bet that this: -D=FOO\ 3 is probably frowned upon, and I'd consider it a "negative testing" (artifact) bug against the command line parser. Sincerely, --Eljay "I hate the preprocessor."
