First Commit

2025-11-19 16:23:45 +07:00
commit dbdc5bcc4a
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+Configuration tests
+===================
+
+Libpqxx comes with support for different build systems: the GNU autotools,
+CMake, Visual Studio's "nmake", and raw GNU "make" on Windows.
+
+For several of these build systems, we need to test things like "does this
+compiler environment support `std::to_chars` for floating-point types?"
+
+We test these things by trying to compile a particular snippet of code, and
+seeing whether that succeeds.
+
+To avoid duplicating those snippets for multiple build systems, we put them
+here.  Both the autotools configuration and the CMake configuration can refer to
+them that way.
+
+It took a bit of nasty magic to read a C++ source file into m4 and treat it as
+a string literal, without macro expansion.  There is every chance that I missed
+something, so be prepared for tests failing for unexpected reasons!  Some C++
+syntax may end up having an unforeseen meaning in m4, and screw up the handling
+of the code snippet.  Re-configure, and read your logs carefully after editing
+these snippets.