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ccompiler-warningsautotools

autotools: Enable compiler warnings

for an autotools-based C project, I'd like to get some more warnings from the compiler (e.g. at least -Wall in CFLAGS). What is the prefered way to enable compiler flags without breaking anything? Is there a m4 macro that tests if a given compiler flag is understood by the compiler? With such a macro I could do

TEST_AND_USE(-Wall -Wextra <other flags>)

Thanks

Solution

  • Widely used is the attributes.m4 CC_CHECK_CFLAG_APPEND macro from the xine project. Although, you often find variants (since it's quite simple) written directly in configure.ac