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| author | Ronald Wampler <rdwampler@gmail.com> | 2016-07-07 16:45:54 -0400 |
|---|---|---|
| committer | Junio C Hamano <gitster@pobox.com> | 2016-07-07 14:15:08 -0700 |
| commit | d19e3a5b21f28c07886801616e02e08eab64a7d8 (patch) | |
| tree | f3ad8e4dbce119ebe2a4bbde60b041a44177f0b6 /Makefile | |
| parent | 0b65a8dbdb38962e700ee16776a3042beb489060 (diff) | |
| download | git-d19e3a5b21f28c07886801616e02e08eab64a7d8.tar.gz | |
Makefile: add NEEDS_LIBRT to optionally link with librt
We unconditionally link with librt, when HAVE_CLOCK_GETTIME is defined.
But clock_gettime() has been available in most libc implementations for
some time now (e.g., for glibc since version 2.17) and no longer
requires linking with librt. Furthermore, commit a6c3c63 (configure.ac:
check for clock_gettime() and CLOCK_MONOTONIC) will automatically
determined which library (libc or librt) is required for linking when
checking for clock_gettime().
The assumption to unconditionally link with librt was OK, since either
almost every Unix-like system provides a version of librt for backwards
compatibility or other systems, namely Windows or OS X, never provided
clock_gettime(). However, in the latest release of OS X (macOS Sierra),
this function has been added to OS X libc version. As a result, when
running the configuration script, HAVE_CLOCK_GETTIME is set and since
librt is not present, it causes a linker error.
This patches requires those not building via the configuration scripts
to define NEEDS_LIBRT in addition to HAVE_CLOCK_GETTIME, if needed.
Signed-off-by: Ronald Wampler <rdwampler@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'Makefile')
| -rw-r--r-- | Makefile | 12 |
1 files changed, 9 insertions, 3 deletions
@@ -351,9 +351,12 @@ all:: # Define GMTIME_UNRELIABLE_ERRORS if your gmtime() function does not # return NULL when it receives a bogus time_t. # -# Define HAVE_CLOCK_GETTIME if your platform has clock_gettime in librt. +# Define HAVE_CLOCK_GETTIME if your platform has clock_gettime. # -# Define HAVE_CLOCK_MONOTONIC if your platform has CLOCK_MONOTONIC in librt. +# Define HAVE_CLOCK_MONOTONIC if your platform has CLOCK_MONOTONIC. +# +# Define NEEDS_LIBRT if your platform requires linking with librt (glibc version +# before 2.17) for clock_gettime and CLOCK_MONOTONIC. # # Define USE_PARENS_AROUND_GETTEXT_N to "yes" if your compiler happily # compiles the following initialization: @@ -1465,13 +1468,16 @@ endif ifdef HAVE_CLOCK_GETTIME BASIC_CFLAGS += -DHAVE_CLOCK_GETTIME - EXTLIBS += -lrt endif ifdef HAVE_CLOCK_MONOTONIC BASIC_CFLAGS += -DHAVE_CLOCK_MONOTONIC endif +ifdef NEEDS_LIBRT + EXTLIBS += -lrt +endif + ifdef HAVE_BSD_SYSCTL BASIC_CFLAGS += -DHAVE_BSD_SYSCTL endif |