[libc][bazel] Add targets for strfrom<float>

[michaelrj-google]

Add targets and tests for strfromf, strfromd and strfroml.

No idea why the standard committee decided that the long double function
should be "strfroml" instead of "strfromld" which would match "strtold"
and leave them space to add string from integer functions in future.

[llvmbot]

@llvm/pr-subscribers-libc

Author: Michael Jones (michaelrj-google)

Changes

Add targets and tests for strfromf, strfromd and strfroml.

No idea why the standard committee decided that the long double function
should be "strfroml" instead of "strfromld" which would match "strtold"
and leave them space to add string from integer functions in future.

---

Full diff: https://github.com/llvm/llvm-project/pull/128956.diff

2 Files Affected:

• (modified) utils/bazel/llvm-project-overlay/libc/BUILD.bazel (+43)
• (modified) utils/bazel/llvm-project-overlay/libc/test/src/stdlib/BUILD.bazel (+31)

diff --git a/utils/bazel/llvm-project-overlay/libc/BUILD.bazel b/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
index c7654ed0b8797..b45145acc2cfe 100644
--- a/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
@@ -3571,6 +3571,49 @@ libc_function(
     ],
 )
 
+libc_support_library(
+    name = "str_from_util",
+    hdrs = ["src/stdlib/str_from_util.h"],
+    deps = [
+        ":__support_common",
+        ":__support_cpp_type_traits",
+        ":__support_str_to_integer",
+        ":printf_converter",
+        ":printf_core_structs",
+        ":printf_writer",
+    ],
+)
+
+libc_function(
+    name = "strfromf",
+    srcs = ["src/stdlib/strfromf.cpp"],
+    hdrs = ["src/stdlib/strfromf.h"],
+    deps = [
+        ":__support_common",
+        ":str_from_util",
+    ],
+)
+
+libc_function(
+    name = "strfromd",
+    srcs = ["src/stdlib/strfromd.cpp"],
+    hdrs = ["src/stdlib/strfromd.h"],
+    deps = [
+        ":__support_common",
+        ":str_from_util",
+    ],
+)
+
+libc_function(
+    name = "strfroml",
+    srcs = ["src/stdlib/strfroml.cpp"],
+    hdrs = ["src/stdlib/strfroml.h"],
+    deps = [
+        ":__support_common",
+        ":str_from_util",
+    ],
+)
+
 libc_function(
     name = "strtol",
     srcs = ["src/stdlib/strtol.cpp"],
diff --git a/utils/bazel/llvm-project-overlay/libc/test/src/stdlib/BUILD.bazel b/utils/bazel/llvm-project-overlay/libc/test/src/stdlib/BUILD.bazel
index a8b37c5ddcc2c..2566607fc053b 100644
--- a/utils/bazel/llvm-project-overlay/libc/test/src/stdlib/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/libc/test/src/stdlib/BUILD.bazel
@@ -149,6 +149,37 @@ libc_test(
     deps = ["//libc:types_size_t"],
 )
 
+libc_support_library(
+    name = "strfrom_test_support",
+    hdrs = ["StrfromTest.h"],
+    deps = [
+        "//libc:__support_cpp_type_traits",
+        "//libc:__support_fputil_fp_bits",
+        "//libc/test/UnitTest:LibcUnitTest",
+    ],
+)
+
+libc_test(
+    name = "strfromf_test",
+    srcs = ["strfromf_test.cpp"],
+    libc_function_deps = ["//libc:strfromf"],
+    deps = [":strfrom_test_support"],
+)
+
+libc_test(
+    name = "strfromd_test",
+    srcs = ["strfromd_test.cpp"],
+    libc_function_deps = ["//libc:strfromd"],
+    deps = [":strfrom_test_support"],
+)
+
+libc_test(
+    name = "strfroml_test",
+    srcs = ["strfroml_test.cpp"],
+    libc_function_deps = ["//libc:strfroml"],
+    deps = [":strfrom_test_support"],
+)
+
 libc_support_library(
     name = "strtol_test_helper",
     hdrs = ["StrtolTest.h"],