[libc] Add float.h header. (#78737)

Author: lntue

libc/config/baremetal/arm/headers.txt

@@ -2,6 +2,7 @@ set(TARGET_PUBLIC_HEADERS
     libc.include.ctype
     libc.include.fenv
     libc.include.errno
+    libc.include.float
     libc.include.inttypes
     libc.include.math
     libc.include.stdio

libc/config/baremetal/riscv/headers.txt

@@ -2,6 +2,7 @@ set(TARGET_PUBLIC_HEADERS
     libc.include.ctype
     libc.include.fenv
     libc.include.errno
+    libc.include.float
     libc.include.inttypes
     libc.include.math
     libc.include.stdio

libc/config/darwin/arm/headers.txt

@@ -2,6 +2,7 @@ set(TARGET_PUBLIC_HEADERS
     libc.include.ctype
     libc.include.errno
     libc.include.fenv
+    libc.include.float
     libc.include.inttypes
     libc.include.math
     libc.include.stdlib

libc/config/darwin/x86_64/headers.txt

@@ -3,6 +3,7 @@ set(TARGET_PUBLIC_HEADERS
     libc.include.errno
     # Fenv is currently disabled.
     #libc.include.fenv
+    libc.include.float
     libc.include.inttypes
     libc.include.math
     libc.include.stdlib

libc/config/gpu/headers.txt

@@ -2,6 +2,7 @@ set(TARGET_PUBLIC_HEADERS
     libc.include.assert
     libc.include.ctype
     libc.include.string
+    libc.include.float
     libc.include.inttypes
     libc.include.math
     libc.include.fenv

libc/config/linux/aarch64/headers.txt

@@ -4,6 +4,7 @@ set(TARGET_PUBLIC_HEADERS
     libc.include.errno
     libc.include.features
     libc.include.fenv
+    libc.include.float
     libc.include.inttypes
     libc.include.math
     libc.include.pthread

libc/config/linux/arm/headers.txt

@@ -2,6 +2,7 @@ set(TARGET_PUBLIC_HEADERS
     libc.include.ctype
     libc.include.fenv
     libc.include.errno
+    libc.include.float
     libc.include.inttypes
     libc.include.math
     libc.include.stdlib

libc/config/linux/riscv/headers.txt

@@ -6,6 +6,7 @@ set(TARGET_PUBLIC_HEADERS
     libc.include.fcntl
     libc.include.features
     libc.include.fenv
+    libc.include.float
     libc.include.inttypes
     libc.include.math
     libc.include.pthread

libc/config/linux/x86_64/headers.txt

@@ -6,6 +6,7 @@ set(TARGET_PUBLIC_HEADERS
     libc.include.fcntl
     libc.include.features
     libc.include.fenv
+    libc.include.float
     libc.include.inttypes
     libc.include.math
     libc.include.pthread

libc/include/CMakeLists.txt

@@ -75,6 +75,14 @@ add_gen_header(
     .llvm-libc-types.imaxdiv_t
 )
 
+add_gen_header(
+  float
+  DEF_FILE float.h.def
+  GEN_HDR float.h
+  DEPENDS
+    .llvm-libc-macros.float_macros
+)
+
 add_gen_header(
   math
   DEF_FILE math.h.def