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find_package: Add minimal support for CPS multiple inclusion

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Do not try to load a CPS file if we've already loaded the same file.
This only works if the current `find_package` call selects the same file
as the previous most recent call, and if the user has not meddled with
the `<name>_CONFIG` variable.

Issue: #26731
This commit is contained in:
Matthew Woehlke
2025-04-02 12:21:22 -04:00
committed by Brad King
parent 7167236ba3
commit b498611902
3 changed files with 26 additions and 2 deletions
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12
Source/cmFindPackageCommand.cxx
View File

@@ -1522,6 +1522,7 @@ bool cmFindPackageCommand::HandlePackageMode(
}
}
std::string const fileVar = cmStrCat(this->Name, "_CONFIG");
std::string const foundVar = cmStrCat(this->Name, "_FOUND");
std::string const notFoundMessageVar =
cmStrCat(this->Name, "_NOT_FOUND_MESSAGE");
@@ -1552,7 +1553,15 @@ bool cmFindPackageCommand::HandlePackageMode(
if (this->CpsReader) {
// The package has been found.
found = true;
result = this->ReadPackage();
// Don't read a CPS file if we've already read it.
cmValue const& previousFileFound =
this->Makefile->GetDefinition(fileVar);
if (previousFileFound.Compare(this->FileFound) == 0) {
result = true;
} else {
result = this->ReadPackage();
}
} else if (this->ReadListFile(this->FileFound, DoPolicyScope)) {
// The package has been found.
found = true;
@@ -1725,7 +1734,6 @@ bool cmFindPackageCommand::HandlePackageMode(
this->Makefile->AddDefinition(foundVar, found ? "1" : "0");
// Set a variable naming the configuration file that was found.
std::string const fileVar = cmStrCat(this->Name, "_CONFIG");
if (found) {
this->Makefile->AddDefinition(fileVar, this->FileFound);
} else {

6
Tests/FindPackageCpsTest/CMakeLists.txt
View File

@@ -54,6 +54,12 @@ endfunction()
find_package(Sample CONFIG)
test_version(Sample "2.10.11" 3 2 10 11 0)
###############################################################################
# Test finding a package more than once.
find_package(Repeat REQUIRED)
find_package(Repeat REQUIRED)
###############################################################################
# Test some more complicated version parsing.

10
Tests/FindPackageCpsTest/cps/Repeat.cps Normal file
View File

@@ -0,0 +1,10 @@
{
"cps_version": "0.13",
"name": "Repeat",
"cps_path": "@prefix@/cps",
"components": {
"Repeat": {
"type": "interface"
}
}
}