1 files changed, 37 insertions, 32 deletions

diff --git a/src/lib/pkgconfig/pcparser.cpp b/src/lib/pkgconfig/pcparser.cpp
index 388363af6..4469ca193 100644
--- a/src/lib/pkgconfig/pcparser.cpp
+++ b/src/lib/pkgconfig/pcparser.cpp
@@ -62,6 +62,11 @@ namespace std {
 
 namespace qbs {
 
+using Internal::completeBaseName;
+using Internal::parentPath;
+using Internal::startsWith;
+using Internal::endsWith;
+
 namespace {
 
 // workaround for a missing ctor before c++20
@@ -195,17 +200,6 @@ std::optional<std::vector<std::string>> splitCommand(std::string_view s)
     return result;
 }
 
-bool startsWith(std::string_view haystack, std::string_view needle)
-{
-    return haystack.size() >= needle.size() && haystack.compare(0, needle.size(), needle) == 0;
-}
-
-bool endsWith(std::string_view haystack, std::string_view needle)
-{
-    return haystack.size() >= needle.size()
-            && haystack.compare(haystack.size() - needle.size(), needle.size(), needle) == 0;
-}
-
 [[noreturn]] void raizeUnknownComparisonException(const PcPackage &pkg, std::string_view verName, std::string_view comp)
 {
     std::string message;
@@ -397,17 +391,6 @@ PcPackage::RequiredVersion::ComparisonType comparisonFromString(
     raizeUnknownComparisonException(pkg, verName, comp);
 }
 
-std::string baseName(const std::string_view &filePath)
-{
-    auto pos = filePath.rfind('/');
-    const auto fileName =
-            pos == std::string_view::npos ? std::string_view() : filePath.substr(pos + 1);
-    pos = fileName.rfind('.');
-    return std::string(pos == std::string_view::npos
-            ? std::string_view()
-            : fileName.substr(0, pos));
-}
-
 } // namespace
 
 PcParser::PcParser(const PkgConfig &pkgConfig)
@@ -429,7 +412,7 @@ try
     if (!file.is_open())
         throw PcException(std::string("Can't open file ") + path);
 
-    package.baseFileName = baseName(path);
+    package.baseFileName = std::string{completeBaseName(path)};
 #if HAS_STD_FILESYSTEM
     const auto fsPath = std::filesystem::path(path);
     package.filePath = fsPath.generic_string();
@@ -445,7 +428,7 @@ try
         parseLine(package, line);
     return package;
 } catch(const PcException &ex) {
-    return PcBrokenPackage{path, baseName(path), ex.what()};
+    return PcBrokenPackage{path, std::string{completeBaseName(path)}, ex.what()};
 }
 
 std::string PcParser::trimAndSubstitute(const PcPackage &pkg, std::string_view str) const
@@ -488,6 +471,35 @@ std::string PcParser::trimAndSubstitute(const PcPackage &pkg, std::string_view s
     return result;
 }
 
+std::string PcParser::evaluateVariable(
+    PcPackage &pkg, std::string_view tag, std::string_view str) const
+{
+    static constexpr std::string_view prefixVariable = "prefix";
+    if (m_pkgConfig.options().definePrefix) {
+        if (tag == prefixVariable) {
+            std::string_view prefix = pkg.filePath;
+            prefix = parentPath(prefix);
+            if (completeBaseName(prefix) == "pkgconfig") {
+                prefix = parentPath(prefix);
+                prefix = parentPath(prefix);
+            }
+            pkg.oldPrefix = std::string(str);
+            if (!prefix.empty())
+                str = prefix;
+            return std::string(str);
+        } else if (pkg.oldPrefix
+                && str.size() > pkg.oldPrefix->size()
+                && str.substr(0, pkg.oldPrefix->size()) == *pkg.oldPrefix
+                && str[pkg.oldPrefix->size()] == '/') {
+            auto result = pkg.variables["prefix"];
+            result += str.substr(pkg.oldPrefix->size());
+            return trimAndSubstitute(pkg, result);
+        }
+    }
+
+    return trimAndSubstitute(pkg, str);
+}
+
 void PcParser::parseStringField(
         PcPackage &pkg,
         std::string &field,
@@ -765,14 +777,7 @@ void PcParser::parseLine(PcPackage &pkg, std::string_view str)
         str.remove_prefix(1); // cut '='
         str = trimmed(str);
 
-        // TODO: support guesstimating of the prefix variable (pkg-config's --define-prefix option)
-        // from doc: "try to override the value of prefix for each .pc file found with a
-        // guesstimated value based on the location of the .pc file"
-        // https://gitlab.freedesktop.org/pkg-config/pkg-config/-/blob/pkg-config-0.29.2/parse.c#L998
-        // This option is disabled by default, and Qbs doesn't allow to override it yet, so we can
-        // ignore this feature for now
-
-        const auto value = trimAndSubstitute(pkg, str);
+        const auto value = evaluateVariable(pkg, tag, str);
         if (!pkg.variables.insert({std::string(tag), value}).second)
             raizeDuplicateVariableException(pkg, tag);
     }