build: compatible spaces in path outputted from pkg-config

internal/build/build.go

@@ -301,29 +301,29 @@ func buildAllPkgs(ctx *context, initial []*packages.Package, verbose bool) (pkgs
 				// need to be linked with external library
 				// format: ';' separated alternative link methods. e.g.
 				//   link: $LLGO_LIB_PYTHON; $(pkg-config --libs python3-embed); -lpython3
-				expd := ""
 				altParts := strings.Split(param, ";")
+				expdArgs := make([]string, 0, len(altParts))
 				for _, param := range altParts {
 					param = strings.TrimSpace(param)
 					if strings.ContainsRune(param, '$') {
-						expd = env.ExpandEnv(param)
+						expdArgs = append(expdArgs, env.ExpandEnvToArgs(param)...)
 						ctx.nLibdir++
 					} else {
-						expd = param
+						expdArgs = append(expdArgs, param)
 					}
-					if len(expd) > 0 {
+					if len(expdArgs) > 0 {
 						break
 					}
 				}
-				if expd == "" {
+				if len(expdArgs) == 0 {
 					panic(fmt.Sprintf("'%s' cannot locate the external library", param))
 				}
 
 				pkgLinkArgs := make([]string, 0, 3)
-				if expd[0] == '-' {
-					pkgLinkArgs = append(pkgLinkArgs, strings.Split(expd, " ")...)
+				if expdArgs[0][0] == '-' {
+					pkgLinkArgs = append(pkgLinkArgs, expdArgs...)
 				} else {
-					linkFile := expd
+					linkFile := expdArgs[0]
 					dir, lib := filepath.Split(linkFile)
 					pkgLinkArgs = append(pkgLinkArgs, "-l"+lib)
 					if dir != "" {
@@ -332,7 +332,7 @@ func buildAllPkgs(ctx *context, initial []*packages.Package, verbose bool) (pkgs
 					}
 				}
 				if err := clangCheck.CheckLinkArgs(pkgLinkArgs); err != nil {
-					panic(fmt.Sprintf("test link args '%s' failed\n\texpanded to: %s\n\tresolved to: %v\n\terror: %v", param, expd, pkgLinkArgs, err))
+					panic(fmt.Sprintf("test link args '%s' failed\n\texpanded to: %v\n\tresolved to: %v\n\terror: %v", param, expdArgs, pkgLinkArgs, err))
 				}
 				aPkg.LinkArgs = append(aPkg.LinkArgs, pkgLinkArgs...)
 			}
@@ -714,9 +714,9 @@ func clFiles(ctx *context, files string, pkg *packages.Package, procFile func(li
 	args := make([]string, 0, 16)
 	if strings.HasPrefix(files, "$") { // has cflags
 		if pos := strings.IndexByte(files, ':'); pos > 0 {
-			cflags := env.ExpandEnv(files[:pos])
+			cflags := env.ExpandEnvToArgs(files[:pos])
 			files = files[pos+1:]
-			args = append(args, strings.Split(cflags, " ")...)
+			args = append(args, cflags...)
 		}
 	}
 	for _, file := range strings.Split(files, ";") {

internal/build/cgo.go

@@ -28,12 +28,13 @@ import (
 	"strings"
 
 	"github.com/goplus/llgo/internal/buildtags"
+	"github.com/goplus/llgo/internal/safesplit"
 )
 
 type cgoDecl struct {
 	tag     string
-	cflags  string
-	ldflags string
+	cflags  []string
+	ldflags []string
 }
 
 type cgoPreamble struct {
@@ -66,11 +67,11 @@ func buildCgo(ctx *context, pkg *aPackage, files []*ast.File, externs map[string
 	ldflags := []string{}
 	for _, cdecl := range cdecls {
 		if cdecl.tag == "" || tagUsed[cdecl.tag] {
-			if cdecl.cflags != "" {
-				cflags = append(cflags, cdecl.cflags)
+			if len(cdecl.cflags) > 0 {
+				cflags = append(cflags, cdecl.cflags...)
 			}
-			if cdecl.ldflags != "" {
-				ldflags = append(ldflags, cdecl.ldflags)
+			if len(cdecl.ldflags) > 0 {
+				ldflags = append(ldflags, cdecl.ldflags...)
 			}
 		}
 	}
@@ -121,7 +122,7 @@ func buildCgo(ctx *context, pkg *aPackage, files []*ast.File, externs map[string
 		}, verbose)
 	}
 	for _, ldflag := range ldflags {
-		cgoLdflags = append(cgoLdflags, strings.Split(ldflag, " ")...)
+		cgoLdflags = append(cgoLdflags, safesplit.SplitPkgConfigFlags(ldflag)...)
 	}
 	return
 }
@@ -296,18 +297,18 @@ func parseCgoDecl(line string) (cgoDecls []cgoDecl, err error) {
 		}
 		cgoDecls = append(cgoDecls, cgoDecl{
 			tag:     tag,
-			cflags:  strings.TrimSpace(string(cflags)),
-			ldflags: strings.TrimSpace(string(ldflags)),
+			cflags:  safesplit.SplitPkgConfigFlags(string(cflags)),
+			ldflags: safesplit.SplitPkgConfigFlags(string(ldflags)),
 		})
 	case "CFLAGS":
 		cgoDecls = append(cgoDecls, cgoDecl{
 			tag:    tag,
-			cflags: arg,
+			cflags: safesplit.SplitPkgConfigFlags(arg),
 		})
 	case "LDFLAGS":
 		cgoDecls = append(cgoDecls, cgoDecl{
 			tag:     tag,
-			ldflags: arg,
+			ldflags: safesplit.SplitPkgConfigFlags(arg),
 		})
 	}
 	return

internal/safesplit/safesplit.go

@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2024 The GoPlus Authors (goplus.org). All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package safesplit
+
+import "strings"
+
+// SplitPkgConfigFlags splits a pkg-config outputs string into parts.
+// Each part starts with "-" followed by a single character flag.
+// Spaces after the flag character are ignored.
+// Content is read until the next space, unless escaped with "\".
+func SplitPkgConfigFlags(s string) []string {
+	var result []string
+	var current strings.Builder
+	i := 0
+
+	// Skip leading whitespace
+	for i < len(s) && (s[i] == ' ' || s[i] == '\t') {
+		i++
+	}
+
+	for i < len(s) {
+		// Start a new part
+		if current.Len() > 0 {
+			result = append(result, strings.TrimSpace(current.String()))
+			current.Reset()
+		}
+		// Write "-" and the flag character
+		current.WriteByte('-')
+		i++
+		if i < len(s) {
+			current.WriteByte(s[i])
+			i++
+		}
+		// Skip spaces after flag character
+		for i < len(s) && (s[i] == ' ' || s[i] == '\t') {
+			i++
+		}
+		// Read content until next space
+		for i < len(s) {
+			if s[i] == '\\' && i+1 < len(s) && (s[i+1] == ' ' || s[i+1] == '\t') {
+				// Skip backslash and write the escaped space
+				i++
+				current.WriteByte(s[i])
+				i++
+				continue
+			}
+			if s[i] == ' ' || s[i] == '\t' {
+				// Skip consecutive spaces
+				j := i
+				for j < len(s) && (s[j] == ' ' || s[j] == '\t') {
+					j++
+				}
+				// If we've seen content, check for new flag
+				if j < len(s) && s[j] == '-' {
+					i = j
+					break
+				}
+				// Otherwise, include one space and continue
+				current.WriteByte(' ')
+				i = j
+			} else {
+				current.WriteByte(s[i])
+				i++
+			}
+		}
+	}
+	// Add the last part
+	if current.Len() > 0 {
+		result = append(result, strings.TrimSpace(current.String()))
+	}
+	return result
+}

internal/safesplit/safesplit_test.go

@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2024 The GoPlus Authors (goplus.org). All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package safesplit
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestSplitPkgConfigFlags(t *testing.T) {
+	ftest := func(s, want string) {
+		t.Helper() // for better error message
+		got := toString(SplitPkgConfigFlags(s))
+		if got != want {
+			t.Errorf("\nSplitPkgConfigFlags(%q) =\n got %v\nwant %v", s, got, want)
+		}
+	}
+
+	t.Run("basic", func(t *testing.T) {
+		ftest("-I/usr/include -L/usr/lib", `["-I/usr/include" "-L/usr/lib"]`)
+		ftest("-I /usr/include -L /usr/lib", `["-I/usr/include" "-L/usr/lib"]`)
+		ftest("-L/opt/homebrew/Cellar/bdw-gc/8.2.8/lib -lgc",
+			`["-L/opt/homebrew/Cellar/bdw-gc/8.2.8/lib" "-lgc"]`)
+	})
+
+	t.Run("spaces_in_path", func(t *testing.T) {
+		ftest("-I/usr/local/include directory -L/usr/local/lib path",
+			`["-I/usr/local/include directory" "-L/usr/local/lib path"]`)
+	})
+
+	t.Run("multiple_spaces", func(t *testing.T) {
+		ftest("  -I  /usr/include   -L   /usr/lib  ", `["-I/usr/include" "-L/usr/lib"]`)
+	})
+
+	t.Run("consecutive_flags", func(t *testing.T) {
+		ftest("-I -L", `["-I-L"]`)
+		ftest("-I -L /usr/lib", `["-I-L /usr/lib"]`)
+	})
+
+	t.Run("edge_cases", func(t *testing.T) {
+		ftest("", "[]")
+		ftest("   ", "[]")
+		ftest("-", `["-"]`)
+		ftest("-I", `["-I"]`)
+		ftest("-I -", `["-I-"]`)
+	})
+
+	t.Run("escaped_spaces", func(t *testing.T) {
+		ftest(`-I/path\ with\ spaces -L/lib`, `["-I/path with spaces" "-L/lib"]`)
+		ftest(`-I /first\ path -L /second\ long path`, `["-I/first path" "-L/second long path"]`)
+	})
+
+	t.Run("macro_flags", func(t *testing.T) {
+		ftest("-DMACRO -I/usr/include", `["-DMACRO" "-I/usr/include"]`)
+		ftest("-D MACRO -I/usr/include", `["-DMACRO" "-I/usr/include"]`)
+		ftest("-DMACRO=value -I/usr/include", `["-DMACRO=value" "-I/usr/include"]`)
+		ftest("-D MACRO=value -I/usr/include", `["-DMACRO=value" "-I/usr/include"]`)
+		ftest("-D_DEBUG -D_UNICODE -DWIN32", `["-D_DEBUG" "-D_UNICODE" "-DWIN32"]`)
+		ftest("-D _DEBUG -D _UNICODE -D WIN32", `["-D_DEBUG" "-D_UNICODE" "-DWIN32"]`)
+		ftest("-DVERSION=2.1 -DDEBUG=1", `["-DVERSION=2.1" "-DDEBUG=1"]`)
+		ftest("-D VERSION=2.1 -D DEBUG=1", `["-DVERSION=2.1" "-DDEBUG=1"]`)
+	})
+}
+
+func toString(ss []string) string {
+	if ss == nil {
+		return "[]"
+	}
+	s := "["
+	for i, v := range ss {
+		if i > 0 {
+			s += " "
+		}
+		v = strings.ReplaceAll(v, `"`, `\"`)
+		s += `"` + v + `"`
+	}
+	return s + "]"
+}

xtool/env/env.go

@@ -22,6 +22,8 @@ import (
 	"os/exec"
 	"regexp"
 	"strings"
+
+	"github.com/goplus/llgo/internal/safesplit"
 )
 
 var (
@@ -29,6 +31,10 @@ var (
 	reFlag   = regexp.MustCompile(`[^ \t\n]+`)
 )
 
+func ExpandEnvToArgs(s string) []string {
+	return safesplit.SplitPkgConfigFlags(expandEnvWithCmd(s))
+}
+
 func ExpandEnv(s string) string {
 	return expandEnvWithCmd(s)
 }