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21 March 2024, 19:08:26 UTC
Revision d89e10cd58e5f9e21cbd466e56a1890e2811bee0 authored by Brad King on 14 July 2017, 17:52:53 UTC, committed by Brad King on 14 July 2017, 18:05:22 UTC 
Diagnose object library self-reference
 
The code

    add_library(A OBJECT a.c)
    target_sources(A PRIVATE $<TARGET_OBJECTS:A>)

used to crash CMake via infinite recursion while evaluating the
generator expression.  Then the change in commit v3.9.0-rc1~266^2~1
(cmGeneratorTarget: Replace source classifier implementation,
2017-04-07) avoided the infinite recursion because GetKindedSources now
creates a map entry and initializes it once.  If it is called again on
the same target during that initialization, the partially computed
results are returned.  This is still wrong but does not crash.
Detect and diagnose this case instead.

Co-Author: Ben Boeckel <ben.boeckel@kitware.com>
Fixes: #16578
1 parent 25b72e9
Raw File
Tip revision: d89e10cd58e5f9e21cbd466e56a1890e2811bee0 authored by Brad King on 14 July 2017, 17:52:53 UTC
Diagnose object library self-reference
Tip revision: d89e10c
cmGeneratorExpressionNode.h 
/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
   file Copyright.txt or https://cmake.org/licensing for details.  */
#ifndef cmGeneratorExpressionNode_h
#define cmGeneratorExpressionNode_h

#include "cmConfigure.h" // IWYU pragma: keep

#include <string>
#include <vector>

class cmGeneratorTarget;
class cmLocalGenerator;
struct GeneratorExpressionContent;
struct cmGeneratorExpressionContext;
struct cmGeneratorExpressionDAGChecker;

struct cmGeneratorExpressionNode
{
  enum
  {
    DynamicParameters = 0,
    OneOrMoreParameters = -1,
    OneOrZeroParameters = -2
  };
  virtual ~cmGeneratorExpressionNode() {}

  virtual bool GeneratesContent() const { return true; }

  virtual bool RequiresLiteralInput() const { return false; }

  virtual bool AcceptsArbitraryContentParameter() const { return false; }

  virtual int NumExpectedParameters() const { return 1; }

  virtual std::string Evaluate(
    const std::vector<std::string>& parameters,
    cmGeneratorExpressionContext* context,
    const GeneratorExpressionContent* content,
    cmGeneratorExpressionDAGChecker* dagChecker) const = 0;

  static std::string EvaluateDependentExpression(
    std::string const& prop, cmLocalGenerator* lg,
    cmGeneratorExpressionContext* context, const cmGeneratorTarget* headTarget,
    const cmGeneratorTarget* currentTarget,
    cmGeneratorExpressionDAGChecker* dagChecker);

  static const cmGeneratorExpressionNode* GetNode(
    const std::string& identifier);
};

void reportError(cmGeneratorExpressionContext* context,
                 const std::string& expr, const std::string& result);

#endif
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