Make quality improvements

- Write some more unit tests
- memcpy() on ARM is now faster
- Address the Musl complex math FIXME comments
- Some libm funcs like pow() now support setting errno
- Import the latest and greatest math functions from ARM
- Use more accurate atan2f() and log1pf() implementations
- atoi() and atol() will no longer saturate or clobber errno

tool/cosmocc/bin/cosmocc

@@ -237,7 +237,7 @@ fi
 
 PLATFORM="-D__COSMOPOLITAN__ -D__COSMOCC__ -D__FATCOSMOCC__"
 PREDEF="-include libc/integral/normalize.inc"
-CPPFLAGS="-fno-pie -nostdinc -fno-math-errno -isystem $BIN/../include"
+CPPFLAGS="-fno-pie -nostdinc -isystem $BIN/../include"
 CFLAGS="-fportcosmo -fno-dwarf2-cfi-asm -fno-unwind-tables -fno-asynchronous-unwind-tables -fno-semantic-interposition"
 LDFLAGS="-static -nostdlib -no-pie -fuse-ld=bfd -Wl,-z,noexecstack -Wl,-z,norelro -Wl,--gc-sections"
 PRECIOUS="-fno-omit-frame-pointer"

tool/cosmocc/bin/cosmocross

@@ -48,7 +48,7 @@ ORIGINAL="$0 $*"
 PLATFORM="-D__COSMOPOLITAN__ -D__COSMOCC__"
 PREDEF="-include libc/integral/normalize.inc"
 CFLAGS="-fportcosmo -fno-dwarf2-cfi-asm -fno-unwind-tables -fno-asynchronous-unwind-tables -fno-semantic-interposition"
-CPPFLAGS="-fno-pie -nostdinc -fno-math-errno -isystem $BIN/../include"
+CPPFLAGS="-fno-pie -nostdinc -isystem $BIN/../include"
 LDFLAGS="-static -no-pie -nostdlib -fuse-ld=bfd -Wl,-z,noexecstack"
 APEFLAGS="-Wl,--gc-sections"
 PRECIOUS="-fno-omit-frame-pointer"

tool/emacs/cosmo-cpp-constants.el

@@ -66,6 +66,8 @@
     "__BMI2__"
     "__FMA__"
     "__FAST_MATH__"
+    "__ROUNDING_MATH__"
+    "__NO_MATH_ERRNO__"
     "__FMA4__"
     "__F16C__"
     "__CLZERO__"

tool/emacs/cosmo-platform-constants.el

@@ -70,7 +70,6 @@
            "__GCC_IEC_559"
            "__SUPPORT_SNAN__"
            "__GCC_IEC_559_COMPLEX"
-           "__NO_MATH_ERRNO__"
            "__gnu__"
            "_OPENMP"))