Fix tests.
Merge topic 'compile-features-C-language' into next

7d512744 Fix tests.
Features: Extend concept to C language.

Add properties and variables corresponding to CXX equivalents.

Add features for c_function_prototypes (C90), c_restrict (C99),
c_variadic_macros (C99) and c_static_assert (C11). This can be
extended later.
Merge topic 'compile-features-C-language' into next

ef8fcd92 Features: Extend concept to C language.
Fix test.
Merge topic 'compile-features-C-language' into next

720ed418 Fix test.
Features: Extend concept to C language.

Add properties and variables corresponding to CXX equivalents.

Add features for c_function_prototypes (C90), c_restrict (C99),
c_variadic_macros (C99) and c_static_assert (C11). This can be
extended later.
Merge topic 'compile-features-C-language' into next

c70d4603 Features: Extend concept to C language.
Fix test.
Merge topic 'decay-language-version' into next

3ac24326 Fix test.
Features: Record for GNU 4.7.

Update the CompileFeatures test to verify that unsupported features
do not work.
Tests: Fix name of cache variable.
Help: Fix order of help entries.
Project: Remove extern from static string in feature tests.
Project: Use nullary form of main for compile feature tests.
Project: Fix exit-on-error with compile feature tests.
Features: Extend concept to C language.

Add properties and variables corresponding to CXX equivalents.

Add features for c_function_prototypes (C90), c_restrict (C99),
c_variadic_macros (C99) and c_static_assert (C11). This can be
extended later.
Merge topic 'compile-features-C-language' into next

54489749 Features: Extend concept to C language.
45159446 Project: Fix exit-on-error with compile feature tests.
4c8f3919 Project: Use nullary form of main for compile feature tests.
7b0c1a8c Project: Remove extern from static string in feature tests.
af9911b0 Help: Fix order of help entries.
fe912f11 Tests: Fix name of cache variable.
7f4f8c55 Features: Record for GNU 4.7.