xtool/safesplit:properly handle consecutive short flags

internal/clang/clang_test.go

@@ -446,6 +446,12 @@ func TestFlagMergingScenarios(t *testing.T) {
 			expectComp: []string{"-O3", "-fPIC", "-Wall", "-Wextra", "-std=c11"},
 			expectLink: []string{"-O3", "-lm", "-lpthread", "-static"},
 		},
+		{
+			// case from https://github.com/goplus/llgo/issues/1244
+			name:       "issue 1244",
+			envCFlags:  "-w -pipe -mmacosx-version-min=15 -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk",
+			expectComp: []string{"-w", "-pipe", "-mmacosx-version-min=15", "-isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk"},
+		},
 	}
 
 	// Save original environment

xtool/safesplit/safesplit.go

@@ -49,6 +49,13 @@ func SplitPkgConfigFlags(s string) []string {
 		for i < len(s) && (s[i] == ' ' || s[i] == '\t') {
 			i++
 		}
+
+		// Check if next character is another flag (short flag with no argument)
+		if i < len(s) && s[i] == '-' {
+			// This is a short flag with no argument, finish current flag
+			continue
+		}
+
 		// Read content until next space
 		for i < len(s) {
 			if s[i] == '\\' && i+1 < len(s) && (s[i+1] == ' ' || s[i+1] == '\t') {

xtool/safesplit/safesplit_test.go

@@ -50,8 +50,8 @@ func TestSplitPkgConfigFlags(t *testing.T) {
 	})
 
 	t.Run("consecutive_flags", func(t *testing.T) {
-		ftest("-I -L", `["-I-L"]`)
-		ftest("-I -L /usr/lib", `["-I-L /usr/lib"]`)
+		ftest("-I -L", `["-I" "-L"]`)
+		ftest("-I -L /usr/lib", `["-I" "-L/usr/lib"]`)
 	})
 
 	t.Run("edge_cases", func(t *testing.T) {
@@ -59,7 +59,7 @@ func TestSplitPkgConfigFlags(t *testing.T) {
 		ftest("   ", "[]")
 		ftest("-", `["-"]`)
 		ftest("-I", `["-I"]`)
-		ftest("-I -", `["-I-"]`)
+		ftest("-I -", `["-I" "-"]`)
 	})
 
 	t.Run("escaped_spaces", func(t *testing.T) {
@@ -77,6 +77,12 @@ func TestSplitPkgConfigFlags(t *testing.T) {
 		ftest("-DVERSION=2.1 -DDEBUG=1", `["-DVERSION=2.1" "-DDEBUG=1"]`)
 		ftest("-D VERSION=2.1 -D DEBUG=1", `["-DVERSION=2.1" "-DDEBUG=1"]`)
 	})
+
+	// case for https://github.com/goplus/llgo/issues/1244
+	t.Run("w_pipe", func(t *testing.T) {
+		ftest("-w -pipe", `["-w" "-pipe"]`)
+		ftest("-Os -w -pipe", `["-Os" "-w" "-pipe"]`)
+	})
 }
 
 func toString(ss []string) string {