feat(dragonbox): add LLAR formula

jk-jeon/dragonbox/1.1.3/dragonbox_include_directory.patch

@@ -0,0 +1,7 @@
+diff --git a/a/CMakeLists.txt b/b/CMakeLists.txt
+index a9d80b9..e0417d7 100644
+--- a/a/CMakeLists.txt
++++ b/b/CMakeLists.txt
+@@ -61,1 +61,1 @@
+-set(dragonbox_include_directory "${CMAKE_INSTALL_INCLUDEDIR}/${dragonbox_directory}")
++set(dragonbox_include_directory "${CMAKE_INSTALL_INCLUDEDIR}")

jk-jeon/dragonbox/1.1.3/dragonbox_llar.gox

@@ -0,0 +1,96 @@
+import (
+	"os"
+	"path/filepath"
+	"slices"
+	"strings"
+)
+
+const consumerSource = `#include <cstdlib>
+#include <iostream>
+
+#include "dragonbox/dragonbox_to_chars.h"
+
+int main(void) {
+    constexpr int buffer_length = 1 +
+        jkj::dragonbox::max_output_string_length<jkj::dragonbox::ieee754_binary64>;
+    double x = 1.234;
+    char buffer[buffer_length];
+    char* end_ptr = jkj::dragonbox::to_chars(x, buffer);
+    end_ptr = jkj::dragonbox::to_chars_n(x, buffer);
+    return end_ptr == buffer ? EXIT_FAILURE : EXIT_SUCCESS;
+}
+`
+
+id "jk-jeon/dragonbox"
+
+fromVer "1.1.3"
+
+// The Conan recipe's fPIC=True default changes the static archive, so expose
+// that package-owned choice while keeping the source's subproject disabled.
+defaults {
+	"fPIC": "ON",
+}
+
+filter => {
+	for _, value := range target.options["fPIC"] {
+		if value != "ON" && value != "OFF" {
+			return false
+		}
+	}
+	return true
+}
+
+onBuild ctx => {
+	installDir := ctx.outputDir
+	patch := ctx.Proj.readFile("1.1.3/dragonbox_include_directory.patch")!
+	patchPath := filepath.join(ctx.SourceDir, "_llar_dragonbox.patch")
+	os.writeFile(patchPath, patch, 0o644)!
+	git "-C", ctx.SourceDir, "apply", "--unidiff-zero", "-p2", patchPath
+	lastErr!
+
+	fPIC := slices.contains(target.options["fPIC"], "ON")
+	c := cmake.new(ctx.SourceDir, filepath.join(ctx.SourceDir, "_build"), installDir)
+	c.defineBool "CMAKE_POSITION_INDEPENDENT_CODE", fPIC
+	c.defineBool "DRAGONBOX_INSTALL_TO_CHARS", true
+	c.defineBool "DRAGONBOX_ENABLE_SUBPROJECT", false
+	c.configure
+	c.build
+	c.install
+
+	licenseDir := filepath.join(installDir, "licenses")
+	os.mkdirAll(licenseDir, 0o755)!
+	for name in []string{"LICENSE-Apache2-LLVM", "LICENSE-Boost"} {
+		license := os.readFile(filepath.join(ctx.SourceDir, name))!
+		os.writeFile(filepath.join(licenseDir, name), license, 0o644)!
+	}
+
+	flags := []string{
+		"-I" + filepath.join(installDir, "include"),
+		"-L" + filepath.join(installDir, "lib"),
+		"-ldragonbox_to_chars",
+	}
+	ctx.setMetadata strings.join(flags, " ")
+}
+
+onTest ctx => {
+	installDir := ctx.outputDir
+	testDir := filepath.join(ctx.SourceDir, "_llar_consumer")
+	os.mkdirAll(testDir, 0o755)!
+
+	consumer := filepath.join(testDir, "consumer.cpp")
+	os.writeFile(consumer, []byte(consumerSource), 0o644)!
+
+	binary := filepath.join(testDir, "consumer")
+	flags := []string{
+		"-std=c++17",
+		"-I" + filepath.join(installDir, "include"),
+		"-L" + filepath.join(installDir, "lib"),
+		"-ldragonbox_to_chars",
+		consumer,
+		"-o", binary,
+	}
+	exec "c++", flags...
+	lastErr!
+	exec binary
+	lastErr!
+}

jk-jeon/dragonbox/versions.json

@@ -0,0 +1,4 @@
+{
+  "path": "jk-jeon/dragonbox",
+  "deps": {}
+}