diff options
Diffstat (limited to 'm4/depend.m4')
| -rw-r--r-- | m4/depend.m4 | 29 |
1 files changed, 22 insertions, 7 deletions
diff --git a/m4/depend.m4 b/m4/depend.m4 index d0b24dce1..388e5ad47 100644 --- a/m4/depend.m4 +++ b/m4/depend.m4 @@ -61,18 +61,32 @@ AC_CACHE_CHECK([dependency style of $depcc], # using a relative directory. cp "$am_depcomp" conftest.dir cd conftest.dir + # We will build objects and dependencies in a subdirectory because + # it helps to detect inapplicable dependency modes. For instance + # both Tru64's cc and ICC support -MD to output dependencies as a + # side effect of compilation, but ICC will put the dependencies in + # the current directory while Tru64 will put them in the object + # directory. + mkdir sub am_cv_$1_dependencies_compiler_type=none if test "$am_compiler_list" = ""; then am_compiler_list=`sed -n ['s/^#*\([a-zA-Z0-9]*\))$/\1/p'] < ./depcomp` fi for depmode in $am_compiler_list; do + # Setup a source with many dependencies, because some compilers + # like to wrap large dependency lists on column 80 (with \), and + # we should not choose a depcomp mode which is confused by this. + # # We need to recreate these files for each test, as the compiler may # overwrite some of them when testing with obscure command lines. # This happens at least with the AIX C compiler. - echo '#include "conftest.h"' > conftest.c - echo 'int i;' > conftest.h - echo "${am__include} ${am__quote}conftest.Po${am__quote}" > confmf + : > sub/conftest.c + for i in 1 2 3 4 5 6; do + echo '#include "conftst'$i'.h"' >> sub/conftest.c + : > sub/conftst$i.h + done + echo "${am__include} ${am__quote}sub/conftest.Po${am__quote}" > confmf case $depmode in nosideeffect) @@ -90,11 +104,12 @@ AC_CACHE_CHECK([dependency style of $depcc], # mode. It turns out that the SunPro C++ compiler does not properly # handle `-M -o', and we need to detect this. if depmode=$depmode \ - source=conftest.c object=conftest.o \ - depfile=conftest.Po tmpdepfile=conftest.TPo \ - $SHELL ./depcomp $depcc -c -o conftest.o conftest.c \ + source=sub/conftest.c object=sub/conftest.${OBJEXT-o} \ + depfile=sub/conftest.Po tmpdepfile=sub/conftest.TPo \ + $SHELL ./depcomp $depcc -c -o sub/conftest.${OBJEXT-o} sub/conftest.c \ >/dev/null 2>conftest.err && - grep conftest.h conftest.Po > /dev/null 2>&1 && + grep sub/conftst6.h sub/conftest.Po > /dev/null 2>&1 && + grep sub/conftest.${OBJEXT-o} sub/conftest.Po > /dev/null 2>&1 && ${MAKE-make} -s -f confmf > /dev/null 2>&1; then # icc doesn't choke on unknown options, it will just issue warnings # (even with -Werror). So we grep stderr for any message |