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Provide error on gcc < 4.1 when THREADSAFE

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Provide a descriptive error message when compiling THREADSAFE on gcc
versions < 4.1.  We require the atomic primitives (eg
`__sync_synchronize`) that were introduced in that version.

(Note, clang setes `__GNUC__` but appears to set its version > 4.1.)
This commit is contained in:
Edward Thomson 2017-02-22 10:34:19 +00:00
parent b13f0da153
commit aa5ea47f73
1 changed files with 6 additions and 0 deletions
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6
src/thread-utils.h
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@ -7,6 +7,12 @@
#ifndef INCLUDE_thread_utils_h__
#define INCLUDE_thread_utils_h__
#if defined(__GNUC__) && defined(GIT_THREADS)
# if (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 1))
# error Atomic primitives do not exist on this version of gcc; configure libgit2 with -DTHREADSAFE=OFF
# endif
#endif
/* Common operations even if threading has been disabled */
typedef struct {
#if defined(GIT_WIN32)