Pango Reference Manual: Version Checking

## Version Checking Version Checking — Tools for checking Pango version at compile- and run-time. |

## Functions

#define | PANGO_VERSION_ENCODE()
#define | PANGO_VERSION_CHECK()
int | pango_version ()
const char * | pango_version_string ()
const char * | pango_version_check ()

## Types and Values

#define | PANGO_VERSION
#define | PANGO_VERSION_MAJOR
#define | PANGO_VERSION_MINOR
#define | PANGO_VERSION_MICRO
#define | PANGO_VERSION_STRING

## Description

The capital-letter macros defined here can be used to check the version of Pango at compile-time, and to encode Pango versions into integers.

The functions can be used to check the version of the linked Pango library at run-time.

## Functions

### PANGO_VERSION_ENCODE()

    #define             PANGO_VERSION_ENCODE(major, minor, micro)

This macro encodes the given Pango version into an integer. The numbers returned by `PANGO_VERSION` and `pango_version()` are encoded using this macro. Two encoded version numbers can be compared as integers.

#### Parameters

major | the major component of the version number |
minor | the minor component of the version number |
micro | the micro component of the version number |

### PANGO_VERSION_CHECK()

    #define             PANGO_VERSION_CHECK(major,minor,micro)

Checks that the version of Pango available at compile-time is not older than the provided version number.

#### Parameters

major | the major component of the version number |
minor | the minor component of the version number |
micro | the micro component of the version number |

### pango_version ()

    int
    pango_version (void);

This is similar to the macro `PANGO_VERSION` except that it returns the encoded version of Pango available at run-time, as opposed to the version available at compile-time.

A version number can be encoded into an integer using `PANGO_VERSION_ENCODE()`.

#### Returns

The encoded version of Pango library available at run time.

Since 1.16

### pango_version_string ()

    const char *
    pango_version_string (void);

This is similar to the macro `PANGO_VERSION_STRING` except that it returns the version of Pango available at run-time, as opposed to the version available at compile-time.

#### Returns

A string containing the version of Pango library available at run time. The returned string is owned by Pango and should not be modified or freed.

Since 1.16

### pango_version_check ()

    const char *
    pango_version_check (int required_major,
                         int required_minor,
                         int required_micro);

Checks that the Pango library in use is compatible with the given version. Generally you would pass in the constants `PANGO_VERSION_MAJOR`, `PANGO_VERSION_MINOR`, `PANGO_VERSION_MICRO` as the three arguments to this function; that produces a check that the library in use at run-time is compatible with the version of Pango the application or module was compiled against.

Compatibility is defined by two things: first the version of the running library is newer than the version `required_major.required_minor` .`required_micro` . Second the running library must be binary compatible with the version `required_major.required_minor` .`required_micro` (same major version.)

For compile-time version checking use `PANGO_VERSION_CHECK()`.

#### Parameters

required_major | the required major version. |
required_minor | the required minor version. |
required_micro | the required major version. |

#### Returns

`NULL` if the Pango library is compatible with the given version, or a string describing the version mismatch. The returned string is owned by Pango and should not be modified or freed.

Since 1.16

## Types and Values

### PANGO_VERSION

    #define             PANGO_VERSION

The version of Pango available at compile-time, encoded using `PANGO_VERSION_ENCODE()`.

### PANGO_VERSION_MAJOR

    #define PANGO_VERSION_MAJOR 1

The major component of the version of Pango available at compile-time.

### PANGO_VERSION_MINOR

    #define PANGO_VERSION_MINOR 36

The minor component of the version of Pango available at compile-time.

### PANGO_VERSION_MICRO

    #define PANGO_VERSION_MICRO 8

The micro component of the version of Pango available at compile-time.

### PANGO_VERSION_STRING

    #define PANGO_VERSION_STRING "1.36.8"

A string literal containing the version of Pango available at compile-time.