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ENH: Create notion of a 'weak' policy stack entry 

A 'weak' poilcy stack entry responds normally to queries.  However,
setting a policy in a weak entry will recursively set the policy in the
next entry too.  This also gives the internal interface to create a weak
entry the option to provide an initial PolicyMap for it.
This commit is contained in:
Brad King 2009-01-22 13:16:27 -05:00
parent 3a4f76949a
commit 26bf8b2cda
2 changed files with 22 additions and 11 deletions
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19
Source/cmMakefile.cxx
View File

@ -3666,8 +3666,14 @@ bool cmMakefile::SetPolicy(cmPolicies::PolicyID id,
return false;
}
// Store the setting.
this->PolicyStack.back()[id] = status;
// Update the policy stack from the top to the top-most strong entry.
bool previous_was_weak = true;
for(PolicyStackType::reverse_iterator psi = this->PolicyStack.rbegin();
previous_was_weak && psi != this->PolicyStack.rend(); ++psi)
{
(*psi)[id] = status;
previous_was_weak = psi->Weak;
}
// Special hook for presenting compatibility variable as soon as
// the user requests it.
@ -3692,10 +3698,11 @@ bool cmMakefile::SetPolicy(cmPolicies::PolicyID id,
}
//----------------------------------------------------------------------------
cmMakefile::PolicyPushPop::PolicyPushPop(cmMakefile* m):
cmMakefile::PolicyPushPop::PolicyPushPop(cmMakefile* m, bool weak,
cmPolicies::PolicyMap const& pm):
Makefile(m), ReportError(true)
{
this->Makefile->PushPolicy();
this->Makefile->PushPolicy(weak, pm);
this->Makefile->PushPolicyBarrier();
}
@ -3707,10 +3714,10 @@ cmMakefile::PolicyPushPop::~PolicyPushPop()
}
//----------------------------------------------------------------------------
void cmMakefile::PushPolicy()
void cmMakefile::PushPolicy(bool weak, cmPolicies::PolicyMap const& pm)
{
// Allocate a new stack entry.
this->PolicyStack.push_back(PolicyStackEntry());
this->PolicyStack.push_back(PolicyStackEntry(pm, weak));
}
//----------------------------------------------------------------------------

14
Source/cmMakefile.h
View File

@ -349,7 +349,9 @@ public:
class PolicyPushPop
{
public:
PolicyPushPop(cmMakefile* m);
PolicyPushPop(cmMakefile* m,
bool weak = false,
cmPolicies::PolicyMap const& pm = cmPolicies::PolicyMap());
~PolicyPushPop();
void Quiet() { this->ReportError = false; }
private:
@ -943,7 +945,8 @@ private:
std::map<cmStdString, cmTarget*> ImportedTargets;
// Internal policy stack management.
void PushPolicy();
void PushPolicy(bool weak = false,
cmPolicies::PolicyMap const& pm = cmPolicies::PolicyMap());
void PopPolicy();
void PushPolicyBarrier();
void PopPolicyBarrier(bool reportError = true);
@ -955,9 +958,10 @@ private:
struct PolicyStackEntry: public cmPolicies::PolicyMap
{
typedef cmPolicies::PolicyMap derived;
PolicyStackEntry(): derived() {}
PolicyStackEntry(derived const& d): derived(d) {}
PolicyStackEntry(PolicyStackEntry const& r): derived(r) {}
PolicyStackEntry(bool w = false): derived(), Weak(w) {}
PolicyStackEntry(derived const& d, bool w = false): derived(d), Weak(w) {}
PolicyStackEntry(PolicyStackEntry const& r): derived(r), Weak(r.Weak) {}
bool Weak;
};
typedef std::vector<PolicyStackEntry> PolicyStackType;
PolicyStackType PolicyStack;