The libabsl_flags library only contains code when compiling with MSVC, which
Debian doesn't use. Skip compiling absl/flags/flag.cc, and make the Abseil flags
library header-only.
Disable SysinfoTest.NominalCPUFrequency on armel/armhf
NominalCPUFrequency has different behavior on 32-bit and 64-bit ARM
kernels. The Debian arm64 buildds assume they can build 32-bit ARM
packages, but if they do, the NominalCPUFrequency test will fail.
Disable the test when building for 32-bit ARM.
On some architectures, notably armel, Abseil needs symbols defined in
libatomic. Abseil does not currently have a well-developed system to
declare external library dependencies, so just have the linker determine
if anything needs libatomic and add the DT_NEEDED entry where necessary.
- To minimize the possibility of future ABI breakage, treat absl::any,
absl::optional, absl::string_view, and absl::variant as their own types
(rather than aliases for the std:: versions), and compile everything in an
inline namespace.
- Enable upstream's hardened build mode.
- Disable Intel SSE2 on i386, since Debian supports some i386 processors
without that extension. Keep it enabled on amd64, since all amd64 processors
have it.
- Disable Intel SSSE3 entirely, since no i386 processor supports it and Debian
supports amd64 processors without it.
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