Hi Jeff,
On 8/3/2018 9:38 AM, Jeffrey Walton wrote:
I'm having trouble crafting an Autotools test. I'm trying to test for the availability of Micrsoft's init_seg(): ## This needs to be cross-platform, and not MSC specific CXXFLAGS="/WX" XXX_PROGRAM="#include <string> struct Bar { Bar(int x) : m_x(x) {} Bar(const Bar& o) : m_x(o.m_x) {} Bar& operator=(const Bar& o) {m_x=o.m_x; return *this;} static int s_x; int m_x; }; #pragma init_seg(".CRT$XCU") int Bar::s_x = -1; // This should be in a separate source file violating init order. // The problem is, we don't know how to do it with Autotools. Bar f = Bar::s_x;" The problem is, Clang, GCC, XLC, SunCC, etc issue a warning for an unknown pragma. Detecting the warning is part of the test we need. If I change to CXXFLAGS="-Werror" then MSC and other Windows compilers incorrectly reject the program. I think the root cause of the problem is, I need a cross-platform way to say "treat warnings as error". But I don't see an AC_WARNINGS_AS_ERRORS or similar in Autoconf.
There is an AC_LANG_WERROR, but not sure how cross-platform it is. Hopefully it parses stderror rather relying on compiler switches such as -Werror. IIRC, it worked for me when I used it, but I think one problem was that there was no way to turn off this "warnings are errors"-behaviour.
Cheers, Peter _______________________________________________ Autoconf mailing list Autoconf@gnu.org https://lists.gnu.org/mailman/listinfo/autoconf