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AK: On macOS host builds, wrap unistd.h with missing extern "C"

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During the build process on macOS, multiple versions of <unistd.h> were
being included (Apple's version and GCC's version). It appears that
all other places #include the version from GCC, but in Platform.h the
Apple header was being used. GCC's <unistd.h> is wrapped in
`extern "C"`, while Apple's is not. This causes a conflicting
declaration, so we need to wrap the #include with extern "C".

Issue has been observed on macOS Mojave.

See https://github.com/microsoft/vcpkg/issues/11320 for a similar issue.
This commit is contained in:
csb6 2021-08-31 18:23:29 -07:00 • committed by Linus Groh
parent 6386b54746
commit d55dfe2418
1 changed files with 8 additions and 0 deletions
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8
AK/Platform.h
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@ -87,9 +87,17 @@
#endif #endif
#ifndef __serenity__ #ifndef __serenity__
// On macOS (at least Mojave), Apple's version of this header is not wrapped
// in extern "C".
# ifdef AK_OS_MACOS
extern "C" {
# endif
# include <unistd.h> # include <unistd.h>
# undef PAGE_SIZE # undef PAGE_SIZE
# define PAGE_SIZE sysconf(_SC_PAGESIZE) # define PAGE_SIZE sysconf(_SC_PAGESIZE)
# ifdef AK_OS_MACOS
};
# endif
#endif #endif
#ifdef __cplusplus #ifdef __cplusplus