Merge branch 'patch-1' into 'master'

Clean up everything and add lots of new functions

I hope everything here is okay. I fixed some bugs in existing functions (mostly wrong prototypes or off-by-one errors) and formatted everything to a consistent style. If you'd like me to adjust the style, that's no problem. It wasn't very consistent to start with (within the code, and compared to the documentation).

*I added specific notes you may want to comment on to some of the commit messages.*

Major features:
* Pass correct `argv[0]` in loader
* Intercept `readlink("/proc/self/exe")` to allow re-exec
* Add almost all reasonable-to-implement functions in LSB 5.0.0 core generic libc. Remaining functions are:
  - Impossible-to-implement: sigreturn
  - Not useful: reentrant random (`*rand48_r`, etc.), argz, envz, pmap, rpc (clnt_*, svc*, xdr*), bindresvport
  - Got tired of it: checked wchar
* Add additional functions used by android and its NDK tools (clang, cmake, lldb, ninja, etc.).

At this point, I am able to run Android Studio with the bundled prebuilt JDK, and compile, install, and run an android application (including one with native libraries) on a real device, with only a few minor issues:
* must export `LD_LIBRARY_PATH=/opt/android-studio/jre/jre/lib/amd64/server` because musl and glibc interpret the variable differently with regards to `dlopen`. This is something that has to be patched in musl builds of openjdk, so it's not a gcompat issue.
* ld.bfd fails to parse the argument `--sysroot=/path`, but can parse `--sysroot /path`. So there's some difference with `getopt_long_only` (or getopt in general). May be a bug, may be just an API difference. May be it can be patched up.
* LLDB fails to connect to the android phone for native debugging -- I haven't tried it on glibc yet, so it may not be a gcompat issue at all (may be a phone or the app issue).

I'd be happy to send some documentation later.

See merge request !1

1 files changed, 83 insertions, 13 deletions

diff --git a/libgcompat/math.c b/libgcompat/math.c
index 2c793e4..db123f8 100644
--- a/libgcompat/math.c
+++ b/libgcompat/math.c
@@ -1,26 +1,96 @@
-#include <math.h>	// isinf, isnan
+#include <math.h> /* isfinite, isinf, isnan */
 
-int __isinff(float number)
+#include "alias.h" /* weak_alias */
+
+/**
+ * Test for finite value.
+ */
+int __finite(double arg)
+{
+	return isfinite(arg);
+}
+weak_alias(__finite, finite);
+
+/**
+ * Test for finite value.
+ */
+int __finitef(float arg)
 {
-	return isinf(number);
+	return isfinite(arg);
 }
+weak_alias(__finitef, finitef);
 
-int __isinf(double number)
+/**
+ * Test for finite value.
+ */
+int __finitel(long double arg)
 {
-	return isinf(number);
+	return isfinite(arg);
 }
+weak_alias(__finitel, finitel);
 
-int __isnanf(float number)
+/**
+ * Test for infinity.
+ *
+ * LSB 5.0: LSB-Core-generic/baselib---isinf.html
+ */
+int __isinf(double arg)
 {
-	return isnan(number);
+	return isinf(arg);
 }
+weak_alias(__isinf, isinf);
 
-int __isnan(double number)
+/**
+ * Test for infinity.
+ *
+ * LSB 5.0: LSB-Core-generic/baselib---isinff.html
+ */
+int __isinff(float arg)
 {
-	return isnan(number);
+	return isinf(arg);
 }
+weak_alias(__isinff, isinff);
 
-extern __typeof(__isnanf) isnanf __attribute__((weak, alias("__isnanf")));
-extern __typeof(__isnan) isnan __attribute__((weak, alias("__isnan")));
-extern __typeof(__isinff) isinff __attribute__((weak, alias("__isinff")));
-extern __typeof(__isinf) isinf __attribute__((weak, alias("__isinf")));
+/**
+ * Test for infinity.
+ *
+ * LSB 5.0: LSB-Core-generic/baselib---isinfl.html
+ */
+int __isinfl(long double arg)
+{
+	return isinf(arg);
+}
+weak_alias(__isinfl, isinfl);
+
+/**
+ * Test for a NaN.
+ *
+ * LSB 5.0: LSB-Core-generic/baselib---isnan.html
+ */
+int __isnan(double arg)
+{
+	return isnan(arg);
+}
+weak_alias(__isnan, isnan);
+
+/**
+ * Test for a NaN.
+ *
+ * LSB 5.0: LSB-Core-generic/baselib---isnanf.html
+ */
+int __isnanf(float arg)
+{
+	return isnan(arg);
+}
+weak_alias(__isnanf, isnanf);
+
+/**
+ * Test for a NaN.
+ *
+ * LSB 5.0: LSB-Core-generic/baselib---isnanl.html
+ */
+int __isnanl(long double arg)
+{
+	return isnan(arg);
+}
+weak_alias(__isnanl, isnanl);