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instance method

MakeMakefile#with_cppflags

with_cppflags(flags) { || ... }

# File tmp/rubies/ruby-4.1.0-preview1/lib/mkmf.rb, line 699
def with_cppflags(flags)
  cppflags = $CPPFLAGS
  $CPPFLAGS = flags.dup
  ret = yield
ensure
  $CPPFLAGS = cppflags unless ret
end

Sets $CPPFLAGS to flags and yields. If the block returns a falsy value, $CPPFLAGS is reset to its previous value, remains set to flags otherwise.

flags: a C preprocessor flag as a String

See also #with_config #xpopen #what_type? #xsystem also in 4.0 · 3.4

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