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expat: Activate POSIX APIs even without compiler extensions

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Compile with the preprocessor definitions necessary for the `arc4random`
family so it's available even when compiler extensions are not enabled.
Similar things are done in cmbzip2, cmcurl, cmlibarchive, cmliblizma and
cmlibuv.

This issue surfaced on a nightly bot after glibc 2.36 added arc4random
functions. cmlibarchive defines the necessary macro, but also relies on
`HAVE_ARC4RANDOM_BUF`.  cmlibarchive's check with the necessary macro
defined was skipped due to cmexpat running the same check before, but
without the macros, and it being cached.

This extends commit c7c3e39e4f (Utilities: Activate POSIX APIs even
without compiler extensions, 2022-06-02, v3.24.0-rc1~34^2) to cover our
build of expat too.

Issue: #20454
This commit is contained in:
Raul Tambre
2022-11-10 22:23:35 +02:00
committed by Brad King
parent 2780c3c683
commit 019af62294
1 changed files with 6 additions and 0 deletions
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6
Utilities/cmexpat/CMakeLists.txt
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@@ -6,6 +6,12 @@ ELSEIF(CMAKE_C_COMPILER_ID STREQUAL "PathScale")
SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -woffall")
ENDIF()
# Activate POSIX APIs.
if(CMAKE_SYSTEM_NAME MATCHES "^(Linux)$")
add_definitions(-D_DEFAULT_SOURCE -D_BSD_SOURCE)
string(APPEND CMAKE_REQUIRED_DEFINITIONS " -D_DEFAULT_SOURCE -D_BSD_SOURCE")
endif()
include(ConfigureChecks.cmake)
configure_file(expat_config.h.cmake expat_config.h @ONLY)