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build: enable _GNU_SOURCE on GNU/Hurd

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Unconditionally enable _GNU_SOURCE when building on GNU/Hurd; this way
it is possible to properly use/rely on GNU extensions e.g. accept4(),
memrchr(), and the GNU strerror_r().

Closes #17975
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Pino Toscano 2025-07-20 09:24:37 +02:00 • committed by Daniel Stenberg
parent 960fb49245
commit bed83d9d33
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2 changed files with 2 additions and 2 deletions
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CMakeLists.txt
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@ -268,7 +268,7 @@ endif()
include(PickyWarnings)
if(CYGWIN OR CMAKE_SYSTEM_NAME STREQUAL "Linux")
if(CYGWIN OR CMAKE_SYSTEM_NAME STREQUAL "Linux" OR CMAKE_SYSTEM_NAME STREQUAL "GNU")
set_property(DIRECTORY APPEND PROPERTY COMPILE_DEFINITIONS "_GNU_SOURCE") # Required for accept4(), pipe2(), sendmmsg()
list(APPEND CMAKE_REQUIRED_DEFINITIONS "-D_GNU_SOURCE") # Apply to all feature checks
endif()