diff --git a/libc/integral/normalize.inc b/libc/integral/normalize.inc
index bb062e382..39ac2a177 100644
--- a/libc/integral/normalize.inc
+++ b/libc/integral/normalize.inc
@@ -79,6 +79,10 @@
 #undef __linux__
 #endif
 
+#ifdef __gnu_linux__
+#undef __gnu_linux__
+#endif
+
 #ifndef __BIGGEST_ALIGNMENT__
 #define __BIGGEST_ALIGNMENT__ 16
 #endif
diff --git a/libc/tinymath/exp10.c b/libc/tinymath/exp10.c
index f42d7d574..443800a66 100644
--- a/libc/tinymath/exp10.c
+++ b/libc/tinymath/exp10.c
@@ -155,5 +155,6 @@ exp10 (double x)
 
 __strong_reference(exp10, pow10);
 #if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
+__weak_reference(exp10, pow10l);
 __weak_reference(exp10, exp10l);
 #endif
diff --git a/libc/tinymath/exp10l.c b/libc/tinymath/exp10l.c
index 1111bde6e..d41fd35d3 100644
--- a/libc/tinymath/exp10l.c
+++ b/libc/tinymath/exp10l.c
@@ -52,6 +52,6 @@ long double exp10l(long double x)
 	return powl(10.0, x);
 }
 
-__weak_reference(exp10l, pow10l);
+__strong_reference(exp10l, pow10l);
 
 #endif /* long double is long */
diff --git a/test/ctl/to_string_test.cc b/test/ctl/to_string_test.cc
index 69841c7ad..8970d0a0f 100644
--- a/test/ctl/to_string_test.cc
+++ b/test/ctl/to_string_test.cc
@@ -116,10 +116,12 @@ main()
             return 31;
         if (ctl::to_string(3.14L) != "3.14")
             return 32;
+#if LDBL_MANT_DIG > 64
         if (ctl::to_string(LDBL_MAX) != "1.189731495357232e+4932")
             return 33;
         if (ctl::to_string(-LDBL_MAX) != "-1.189731495357232e+4932")
             return 34;
+#endif
     }
 
     CheckForMemoryLeaks();
diff --git a/test/libc/tinymath/acosh_test.c b/test/libc/tinymath/acosh_test.c
index 008972047..639782c04 100644
--- a/test/libc/tinymath/acosh_test.c
+++ b/test/libc/tinymath/acosh_test.c
@@ -48,7 +48,9 @@ TEST(acoshf, test) {
 TEST(acoshl, test) {
   volatile long double x = 16;
   EXPECT_STREQ("4", gc(xdtoal(sqrtl(x))));
+#if LDBL_MANT_DIG > 64
   EXPECT_STREQ(".9624236501192069", gc(xdtoal(_acoshl(1.5))));
+#endif
   EXPECT_STREQ("0", gc(xdtoal(_acoshl(1))));
   EXPECT_TRUE(isnan(_acoshl(NAN)));
   EXPECT_TRUE(isnan(_acoshl(.5)));
diff --git a/test/libc/tinymath/asinh_test.c b/test/libc/tinymath/asinh_test.c
index 1584a1ad6..1a2599534 100644
--- a/test/libc/tinymath/asinh_test.c
+++ b/test/libc/tinymath/asinh_test.c
@@ -46,8 +46,10 @@ TEST(asinhf, test) {
 }
 
 TEST(asinhl, test) {
+#if LDBL_MANT_DIG > 64
   EXPECT_STREQ(".4812118250596034", gc(xdtoal(_asinhl(+.5))));
   EXPECT_STREQ("-.4812118250596034", gc(xdtoal(_asinhl(-.5))));
+#endif
   EXPECT_STREQ("0", gc(xdtoal(_asinhl(0))));
   EXPECT_STREQ("NAN", gc(xdtoal(_asinhl(NAN))));
   EXPECT_STREQ("INFINITY", gc(xdtoal(_asinhl(INFINITY))));
diff --git a/test/libc/tinymath/hypot_test.c b/test/libc/tinymath/hypot_test.c
index 802d994ed..37ede41a0 100644
--- a/test/libc/tinymath/hypot_test.c
+++ b/test/libc/tinymath/hypot_test.c
@@ -99,8 +99,10 @@ TEST(hypotll, test) {
   EXPECT_STREQ("1.414213562373095", gc(xdtoal(_hypotl(-1, 1))));
   EXPECT_STREQ("1.414213626012708", gc(xdtoal(_hypotl(1.0000001, .99999999))));
   EXPECT_STREQ("1.414213626012708", gc(xdtoal(_hypotl(.99999999, 1.0000001))));
+#if LDBL_MANT_DIG > 64
   EXPECT_STREQ("1.414213562373095e+4931",
                gc(xdtoal(_hypotl(1e4931L, 1e4931L))));
+#endif
   EXPECT_STREQ("NAN", gc(xdtoal(_hypotl(0, NAN))));
   EXPECT_STREQ("NAN", gc(xdtoal(_hypotl(NAN, 0))));
   EXPECT_STREQ("NAN", gc(xdtoal(_hypotl(NAN, NAN))));
diff --git a/tool/cosmocc/bin/cosmocc b/tool/cosmocc/bin/cosmocc
index 8020cca6b..0eafccc54 100755
--- a/tool/cosmocc/bin/cosmocc
+++ b/tool/cosmocc/bin/cosmocc
@@ -139,7 +139,9 @@ for x; do
   elif [ x"$x" != x"${x#-O}" ]; then  # startswith(x, "-O")
     OPT=$x
   elif [ x"$x" = x"-c" ]; then
-    INTENT=cc
+    if [ x"$INTENT" != x"cpp" ]; then
+      INTENT=cc
+    fi
   elif [ x"$x" = x"-E" ] ||
        [ x"$x" = x"-M" ] ||
        [ x"$x" = x"-MM" ]; then
@@ -266,7 +268,9 @@ CC_AARCH64="$BIN/aarch64-linux-cosmo-gcc"
 if [ x"$PROG" != x"${PROG%++}" ]; then
   CC_X86_64="$BIN/x86_64-linux-cosmo-g++"
   CC_AARCH64="$BIN/aarch64-linux-cosmo-g++"
-  CFLAGS="$CFLAGS -fno-rtti -fno-exceptions -fuse-cxa-atexit"
+  if [ x"$INTENT" != x"cpp" ]; then
+    CFLAGS="$CFLAGS -fno-rtti -fno-exceptions -fuse-cxa-atexit"
+  fi
   CPPFLAGS="-isystem $BIN/../include/third_party/libcxx $CPPFLAGS"
 else
   CFLAGS="$CFLAGS -Wno-implicit-int"
@@ -325,6 +329,9 @@ if [ $INTENT = cpp ]; then
   if [ -n "$OUTPUT" ]; then
     ARGS="$ARGS -o$OUTPUT"
   fi
+  # undefine cpu-specific and linux-specific defines
+  # we get rid of long double too to not lead astray
+  # we shall leave behind unix, __unix, and __unix__
   set -- \
       "$CC_X86_64" \
       -U__k8 \
@@ -333,10 +340,21 @@ if [ $INTENT = cpp ]; then
       -U__amd64__ \
       -U__x86_64 \
       -U__x86_64__ \
+      -U__MMX__ \
+      -U__MMX_WITH_SSE__ \
+      -U__SSE_MATH__ \
+      -U__SEG_FS \
+      -U__SEG_GS \
       -U__SSE__ \
+      -U__FXSR__ \
       -U__SSE2__ \
       -U__SSE2_MATH__ \
+      -Ulinux \
+      -U__linux \
+      -U__linux__ \
+      -U__gnu_linux__ \
       -mno-red-zone \
+      -mlong-double-64 \
       $PLATFORM \
       $CPPFLAGS \
       $ARGS
diff --git a/tool/emacs/cosmo-cpp-constants.el b/tool/emacs/cosmo-cpp-constants.el
index 5c244b7c0..106c8bc17 100644
--- a/tool/emacs/cosmo-cpp-constants.el
+++ b/tool/emacs/cosmo-cpp-constants.el
@@ -17,6 +17,7 @@
     "__GNUC__"
     "__APPLE__"
     "__linux__"
+    "__gnu_linux__"
     "__HAIKU__"
     "__CYGWIN__"
     "__EMSCRIPTEN__"
@@ -25,10 +26,13 @@
     "__NetBSD__"
     "__NetBSD_Version__"
     "__OpenBSD__"
+    "__Fuchsia__"
     "__COSMOPOLITAN__"
     "__COSMOCC__"
     "__FATCOSMOCC__"
     "__GLIBC__"
+    "__ELF__"
+    "__GNU__"
     "__linux"
     "__MACH__"
     "__GNUG__"
@@ -128,6 +132,8 @@
     "__ARM_FP16_IEEE"
     "__ARM_FP_FAST"
     "__powerpc__"
+    "__POWERPC__"
+    "__ppc__"
     "__powerpc64__"
     "__POWER9_VECTOR__"
     "__wasm_simd128__"
diff --git a/tool/emacs/cosmo-platform-constants.el b/tool/emacs/cosmo-platform-constants.el
index caf232607..48b408b29 100644
--- a/tool/emacs/cosmo-platform-constants.el
+++ b/tool/emacs/cosmo-platform-constants.el
@@ -5,7 +5,6 @@
          '("__cplusplus"
            "__OBJC__"
            "__STRICT_ANSI__"
-           "__ELF__"
            "__VERSION__"
            "__OPTIMIZE__"
            "__OPTIMIZE_SIZE__"
@@ -29,6 +28,7 @@
            "__LP64__"
            "__SSP__"
            "__SSP_ALL__"
+           "__unix"
            "__unix__"
            "__vax__"
            "__ns16000__"