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| author | tejohnson <tejohnson@138bc75d-0d04-0410-961f-82ee72b054a4> | 2012-09-13 04:59:14 +0000 |
|---|---|---|
| committer | tejohnson <tejohnson@138bc75d-0d04-0410-961f-82ee72b054a4> | 2012-09-13 04:59:14 +0000 |
| commit | 3d2ab4bc6d80e9779aa3c9657cb54ee26f36686e (patch) | |
| tree | 82ac9f479b6edc66be72e9fef90299de5bc73430 /gcc/configure.ac | |
| parent | b97a68a81f7073eefc9beb91cb500aa22a6b95c7 (diff) | |
| download | gcc-3d2ab4bc6d80e9779aa3c9657cb54ee26f36686e.tar.gz | |
This fixes PR gcov-profile/54487 where the gcda files were not locked
by the profile-use read, enabling writes by other instrumented compiles
to change the profile in the middle of the profile use read. The GCOV_LOCKED
macro was not set because it was guarded by HOST_HAS_F_SETLKW, which was
never set. The fix is to add a compile test in the configure to set it.
2012-09-12 Teresa Johnson <tejohnson@google.com>
PR gcov-profile/54487
* configure.ac (HOST_HAS_F_SETLKW): Set based on compile
test using F_SETLKW with fcntl.
* configure, config.in: Regenerate.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@191238 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/configure.ac')
| -rw-r--r-- | gcc/configure.ac | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/gcc/configure.ac b/gcc/configure.ac index 699c7904f7c..9f200c7a991 100644 --- a/gcc/configure.ac +++ b/gcc/configure.ac @@ -1159,6 +1159,22 @@ if test $gcc_cv_type_clock_t = yes; then [Define if <time.h> defines clock_t.]) fi +# Check if F_SETLKW is supported by fcntl. +AC_CACHE_CHECK(for F_SETLKW, ac_cv_f_setlkw, [ +AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ +#include <fcntl.h>]], [[ +struct flock fl; +fl.l_whence = 0; +fl.l_start = 0; +fl.l_len = 0; +fl.l_pid = 0; +return fcntl (1, F_SETLKW, &fl);]])], +[ac_cv_f_setlkw=yes],[ac_cv_f_setlkw=no])]) +if test $ac_cv_f_setlkw = yes; then + AC_DEFINE(HOST_HAS_F_SETLKW, 1, + [Define if F_SETLKW supported by fcntl.]) +fi + # Restore CFLAGS, CXXFLAGS from before the gcc_AC_NEED_DECLARATIONS tests. CFLAGS="$saved_CFLAGS" CXXFLAGS="$saved_CXXFLAGS" |