From 8ce1f243e5456eab52486b955389be2521dfcca5 Mon Sep 17 00:00:00 2001 From: Michal Rokos Date: Tue, 11 Mar 2008 09:48:34 +0100 Subject: [PATCH] autoconf: Test FREAD_READS_DIRECTORIES Add test for FREAD_READS_DIRECTORIES to detect when fread() reads fopen'ed directory. Tested on these platforms: AIX 5.3 - FREAD_READS_DIRECTORIES=UnfortunatelyYes HP-UX B.11.11 - FREAD_READS_DIRECTORIES=UnfortunatelyYes HP-UX B.11.23 - FREAD_READS_DIRECTORIES=UnfortunatelyYes Linux 2.6.25-rc4 - FREAD_READS_DIRECTORIES= Tru64 V5.1 - FREAD_READS_DIRECTORIES=UnfortunatelyYes Windows - FREAD_READS_DIRECTORIES= Signed-off-by: Michal Rokos Tested-by: Mike Ralphson Tested-by: Johannes Schindelin Signed-off-by: Junio C Hamano --- config.mak.in | 1 + configure.ac | 20 ++++++++++++++++++++ 2 files changed, 21 insertions(+) diff --git a/config.mak.in b/config.mak.in index 8e1cd5f03d..7868dfd93a 100644 --- a/config.mak.in +++ b/config.mak.in @@ -46,4 +46,5 @@ NO_MKDTEMP=@NO_MKDTEMP@ NO_ICONV=@NO_ICONV@ OLD_ICONV=@OLD_ICONV@ NO_DEFLATE_BOUND=@NO_DEFLATE_BOUND@ +FREAD_READS_DIRECTORIES=@FREAD_READS_DIRECTORIES@ SNPRINTF_RETURNS_BOGUS=@SNPRINTF_RETURNS_BOGUS@ diff --git a/configure.ac b/configure.ac index 287149d304..82584e9153 100644 --- a/configure.ac +++ b/configure.ac @@ -327,6 +327,26 @@ else fi AC_SUBST(NO_C99_FORMAT) # +# Define FREAD_READS_DIRECTORIES if your are on a system which succeeds +# when attempting to read from an fopen'ed directory. +AC_CACHE_CHECK([whether system succeeds to read fopen'ed directory], + [ac_cv_fread_reads_directories], +[ +AC_RUN_IFELSE( + [AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT], + [[char c; + FILE *f = fopen(".", "r"); + return f && fread(&c, 1, 1, f)]])], + [ac_cv_fread_reads_directories=no], + [ac_cv_fread_reads_directories=yes]) +]) +if test $ac_cv_fread_reads_directories = yes; then + FREAD_READS_DIRECTORIES=UnfortunatelyYes +else + FREAD_READS_DIRECTORIES= +fi +AC_SUBST(FREAD_READS_DIRECTORIES) +# # Define SNPRINTF_RETURNS_BOGUS if your are on a system which snprintf() # or vsnprintf() return -1 instead of number of characters which would # have been written to the final string if enough space had been available. -- 2.39.2