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FindBZip2: Fix check for 1.0.1 and earlier versions

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Changes:
- BZip2 versions before 1.0.2 required `<stdio.h>` header file to be
  included before `bzlib.h` for the FILE definition.
- Described `BZIP2_NEED_PREFIX` in more details.
This commit is contained in:
Peter Kokot
2025-06-12 22:54:58 +02:00
parent e84aaa27af
commit c31f68bded
1 changed files with 17 additions and 3 deletions
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Modules/FindBZip2.cmake
+17 -3
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@@ -5,7 +5,11 @@
FindBZip2 FindBZip2
--------- ---------
Finds the BZip2 data compression library (libbz2). Finds the BZip2 data compression library (libbz2):
.. code-block:: cmake
find_package(BZip2 [<version>] [...])
Imported Targets Imported Targets
^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^
@@ -55,7 +59,9 @@ The following cache variables may also be set:
The path to the BZip2 library for debug configurations. The path to the BZip2 library for debug configurations.
``BZIP2_NEED_PREFIX`` ``BZIP2_NEED_PREFIX``
Boolean indicating if the BZip2 functions are prefixed with ``BZ2_``. Boolean indicating whether BZip2 functions are prefixed with ``BZ2_``
(e.g., ``BZ2_bzCompressInit()``). Versions of BZip2 prior to 1.0.0 used
unprefixed function names (e.g., ``bzCompressInit()``).
Legacy Variables Legacy Variables
^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^
@@ -117,7 +123,15 @@ if (BZip2_FOUND)
set(CMAKE_REQUIRED_QUIET ${BZip2_FIND_QUIETLY}) set(CMAKE_REQUIRED_QUIET ${BZip2_FIND_QUIETLY})
set(CMAKE_REQUIRED_INCLUDES ${BZIP2_INCLUDE_DIR}) set(CMAKE_REQUIRED_INCLUDES ${BZIP2_INCLUDE_DIR})
set(CMAKE_REQUIRED_LIBRARIES ${BZIP2_LIBRARIES}) set(CMAKE_REQUIRED_LIBRARIES ${BZIP2_LIBRARIES})
check_symbol_exists(BZ2_bzCompressInit "bzlib.h" BZIP2_NEED_PREFIX)
# Versions before 1.0.2 required <stdio.h> for the FILE definition.
set(BZip2_headers "bzlib.h")
if(BZIP2_VERSION VERSION_LESS "1.0.2")
list(PREPEND BZip2_headers "stdio.h")
endif()
check_symbol_exists(BZ2_bzCompressInit "${BZip2_headers}" BZIP2_NEED_PREFIX)
unset(BZip2_headers)
cmake_pop_check_state() cmake_pop_check_state()
if(NOT TARGET BZip2::BZip2) if(NOT TARGET BZip2::BZip2)