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Test for compiling without warnings against public headers

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Under compilers with WERRORFLAG, MakeMakefile.try_compile treats
warnings as errors, so we can use append_cflags to test whether the
public header files emit warnings with certain flags turned on.

[Regression test for feature #20507]
This commit is contained in:
Mike Dalessio 2024-05-27 13:39:01 -04:00 committed by Jean Boussier
parent 1b8ba1551b
commit ca2d229e6b
1 changed files with 23 additions and 0 deletions
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23
ext/-test-/public_header_warnings/extconf.rb Normal file
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#
# Under compilers with WERRORFLAG, MakeMakefile.try_compile treats warnings as errors, so we can
# use append_cflags to test whether the public header files emit warnings with certain flags turned
# on.
#
def check_append_cflags(flag, msg = nil)
msg ||= "flag #{flag} is not acceptable"
!$CFLAGS.include?(flag) or raise("flag #{flag} already present in $CFLAGS")
append_cflags(flag)
$CFLAGS.include?(flag) or raise(msg)
end
if %w[gcc clang].include?(RbConfig::CONFIG['CC'])
config_string("WERRORFLAG") or raise("expected WERRORFLAG to be defined")
# should be acceptable on all modern C compilers
check_append_cflags("-D_TEST_OK", "baseline compiler warning test failed")
# Feature #20507: Allow compilation of C extensions with -Wconversion
check_append_cflags("-Wconversion", "-Wconversion raising warnings in public headers")
end
create_makefile("-test-/public_header_warnings")