Tests fail on Solaris without `cc` installed

[johannessen]

According to CPAN Testers reports, installation of ExtUtils::CppGuess 0.27 fails on Solaris because of a problem in 002_icpp.t:

Can't exec "cc": No such file or directory at /export/home/cpan/.cpan/build/ExtUtils-CppGuess-0.27-0/blib/lib/ExtUtils/CppGuess.pm line 289.
Can't exec "cc": No such file or directory at /export/home/cpan/.cpan/build/ExtUtils-CppGuess-0.27-0/blib/lib/ExtUtils/CppGuess.pm line 290.
Can't exec "cc": No such file or directory at /export/home/cpan/.cpan/build/ExtUtils-CppGuess-0.27-0/blib/lib/ExtUtils/CppGuess.pm line 291.
Use of uninitialized value $v1 in concatenation (.) or string at /export/home/cpan/.cpan/build/ExtUtils-CppGuess-0.27-0/blib/lib/ExtUtils/CppGuess.pm line 293.
Use of uninitialized value $v2 in concatenation (.) or string at /export/home/cpan/.cpan/build/ExtUtils-CppGuess-0.27-0/blib/lib/ExtUtils/CppGuess.pm line 293.
Use of uninitialized value $v3 in concatenation (.) or string at /export/home/cpan/.cpan/build/ExtUtils-CppGuess-0.27-0/blib/lib/ExtUtils/CppGuess.pm line 293.
Unable to determine a C++ compiler for 'cc' on solaris
Version attempts:
-v: ''
-V: ''
--version: ''
# Tests were run but no plan was declared and done_testing() was not seen.
# Looks like your test exited with 2 just after 11.
t/002_icpp.t ........... 
Dubious, test returned 2 (wstat 512, 0x200)
All 11 subtests passed

(source: https://www.cpantesters.org/cpan/report/0621fc84-2569-11ef-bb1a-ff8020b05d6e)

Analysis

#29 (5e47504) added tests with some mocked compiler output and monkey-patched _capture() to avoid calling the compiler actually installed on the system.

However, one of the tests relies on the fact that _cc_is_gcc() calls not only _capture(), but _capture_empty_stdin() as well.
The latter method is not monkey-patched and will return empty on systems that happen to not have the mocked compiler installed under that specific name.

extutils-cppguess/t/002_icpp.t

Line 143 in babadca

{ "cc --version" => "cc (Debian 12.2.0-14) 12.2.0" },

extutils-cppguess/lib/ExtUtils/CppGuess.pm

Lines 395 to 401 in babadca

	if (
	$cc_version =~ m/\bg(?:cc|\+\+)/i # 3.x, some 4.x
	|| scalar( _capture( "$cc" ) =~ m/\bgcc\b/i ) # 2.95
	|| scalar(_capture_empty_stdin("$cc -dM -E -") =~ /__GNUC__/) # more or less universal?
	|| scalar($cc_version =~ m/\bcc\b.*Free Software Foundation/si) # some 4.x?
	|| $cc eq 'gcc' # because why would they lie?
	) {

Potential solution

Monkey-patch _capture_empty_stdin().

[johannessen]

Actually, it looks like this report is a duplicate of #30.