make: improved binaries check + fix kindle-legacy / pocketbook build

[benoit-pierre]

• bincheck: Add --glibc-version-max to gate the maximum supported GLIBC version: bincheck will fail on libraries that link with more recent symbols.
• glib: avoid pulling-in __sched_cpucount@GLIBC_2.6.

---

This change is 

[benoit-pierre]

And another regression caught:

/home/ko/project/build/sftp-server
  RPATH     : $ORIGIN:$ORIGIN/libs
  NEEDED    : librt.so.1
  NEEDED    : libc.so.6
  UNRESOLVED:
    utimensat@GLIBC_2.6

Looks like tar is not the only potential user.

[benoit-pierre]

As well as:

/home/ko/project/build/libs/libkoreader-input.so
  SONAME    : libkoreader-input.so
  RPATH     : $ORIGIN:$ORIGIN/libs
  NEEDED    : libdl.so.2
  NEEDED    : libinkview.so
  NEEDED    : libpthread.so.0
  NEEDED    : libc.so.6
  UNRESOLVED:
    pipe2@GLIBC_2.9

and

libzmq.so.4
  FILE      : /home/ko/project/build/libs/libzmq.so.4
  SONAME    : libzmq.so.4
  RPATH     : $ORIGIN:$ORIGIN/libs
  NEEDED    : libpthread.so.0
  NEEDED    : librt.so.1
  NEEDED    : libstdc++.so.6
  NEEDED    : libgcc_s.so.1
  NEEDED    : libc.so.6
  UNRESOLVED:
    eventfd@GLIBC_2.7

[benoit-pierre]

That's for pocketbook, no issue with koreader-input locally when building for kindle-legacy.

Which is missing from Circle CI's matrix, how about adding it?

[benoit-pierre]

Tentative patch for the remaining pocketbook issue:

 input/input.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git i/input/input.c w/input/input.c
index 5414d301e..764afa3af 100644
--- i/input/input.c
+++ w/input/input.c
@@ -125,7 +125,7 @@ static int openInputDevice(lua_State* L)
     if (!strcmp("fake_events", inputdevice)) {
         // Special case: the power slider for Kindle and USB events for Kobo.
         int pipefd[2U];
-#if defined(KINDLE_LEGACY)
+#if defined(KINDLE_LEGACY) || defined(POCKETBOOK)
         // pipe2 requires Linux 2.6.27 & glibc 2.9...
         if (pipe(pipefd) == -1) {
             return luaL_error(L, "Cannot create fake event generator communication pipe (pipe(): %s)", strerror(errno));

@NiLuJe?

[NiLuJe]

Tentative patch for the remaining pocketbook issue:

Yup, lgtm!

(Note that we no longer actually use the Lua/C input module on PB, but keeping it functional usually costs us nothing ;p).

[NiLuJe]

For context, this sort of stuff should mostly only happen on kindle-legacy & pocketbook, because they run glibc 2.5, but the toolchain is built against 2.9 (because good luck building 2.5, especially with even a halfway recent GCC version).

For the rest of our targets, the ct-ng config will target the "proper" glibc version directly. Note that even that is a moving target, because vendors will sometime miraculously update it ;).

e.g., kindle5 & kindlepw2 target 2.12.2, but it was actually updated to 2.19 on FW 5.6.5. (And it was probably updated again for the hf switch, but I lost track ;p).

Similarly, kobo targets 2.15, but it was updated to 2.19 (surprise!) on FW 4.6. And will be (massively) updated to 2.3x (can't recall the exact one right now) on 5.0.

[Frenzie]

Which is missing from Circle CI's matrix, how about adding it?

Sure, makes sense. It's likely to overlap very strongly with PB but it's not identical.