From 1e58dba142c673c59fbb9d10aeecf62217d4fc9c Mon Sep 17 00:00:00 2001 From: Ralf Wildenhues Date: Sun, 2 Jan 2011 11:24:55 +0100 Subject: [PATCH] configure: use AC_LANG_PROGRAM consistently Avoid warnings from Autoconf 2.68 about missing use of AC_LANG_PROGRAM and friends. Quoting autoconf-2.68/NEWS: ** The macros AC_PREPROC_IFELSE, AC_COMPILE_IFELSE, AC_LINK_IFELSE, and AC_RUN_IFELSE now warn if the first argument failed to use AC_LANG_SOURCE or AC_LANG_PROGRAM to generate the conftest file contents. A new macro AC_LANG_DEFINES_PROVIDED exists if you have a compelling reason why you cannot use AC_LANG_SOURCE but must avoid the warning. The underlying reason for that change is that AC_LANG_{SOURCE,PROGRAM} take care to supply the previously computed set of #defines (and include standard headers if so desired) for preprocessed languages like C and C++. In some cases, AC_LANG_PROGRAM is already used but not sufficiently m4-quoted, so we just need to add another set of [quotes] to prevent the autoconf warning from being triggered bogusly. Quoting all arguments (except when calling special macros that need to be expanded before recursion) is better style, anyway. These and more rules are described in detail in 'info Autoconf "Programming in M4"'. No change in the resulting config.mak.autogen after running ./configure intended. Signed-off-by: Ralf Wildenhues Signed-off-by: Jonathan Nieder Signed-off-by: Junio C Hamano --- aclocal.m4 | 4 ++-- configure.ac | 56 ++++++++++++++++++---------------------------------- 2 files changed, 21 insertions(+), 39 deletions(-) diff --git a/aclocal.m4 b/aclocal.m4 index d399de2671bff3..f11bc7ed7df2f6 100644 --- a/aclocal.m4 +++ b/aclocal.m4 @@ -13,7 +13,7 @@ AC_DEFUN([TYPE_SOCKLEN_T], git_cv_socklen_t_equiv= for arg2 in "struct sockaddr" void; do for t in int size_t unsigned long "unsigned long"; do - AC_TRY_COMPILE([ + AC_COMPILE_IFELSE([AC_LANG_PROGRAM([ #include #include @@ -21,7 +21,7 @@ AC_DEFUN([TYPE_SOCKLEN_T], ],[ $t len; getpeername(0,0,&len); - ],[ + ])],[ git_cv_socklen_t_equiv="$t" break 2 ]) diff --git a/configure.ac b/configure.ac index 5792425a494814..20039c546f1cc9 100644 --- a/configure.ac +++ b/configure.ac @@ -345,7 +345,7 @@ esac AC_CACHE_CHECK([if linker supports -R], git_cv_ld_dashr, [ SAVE_LDFLAGS="${LDFLAGS}" LDFLAGS="${SAVE_LDFLAGS} -R /" - AC_LINK_IFELSE(AC_LANG_PROGRAM([], []), [git_cv_ld_dashr=yes], [git_cv_ld_dashr=no]) + AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])], [git_cv_ld_dashr=yes], [git_cv_ld_dashr=no]) LDFLAGS="${SAVE_LDFLAGS}" ]) if test "$git_cv_ld_dashr" = "yes"; then @@ -354,7 +354,7 @@ else AC_CACHE_CHECK([if linker supports -Wl,-rpath,], git_cv_ld_wl_rpath, [ SAVE_LDFLAGS="${LDFLAGS}" LDFLAGS="${SAVE_LDFLAGS} -Wl,-rpath,/" - AC_LINK_IFELSE(AC_LANG_PROGRAM([], []), [git_cv_ld_wl_rpath=yes], [git_cv_ld_wl_rpath=no]) + AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])], [git_cv_ld_wl_rpath=yes], [git_cv_ld_wl_rpath=no]) LDFLAGS="${SAVE_LDFLAGS}" ]) if test "$git_cv_ld_wl_rpath" = "yes"; then @@ -363,7 +363,7 @@ else AC_CACHE_CHECK([if linker supports -rpath], git_cv_ld_rpath, [ SAVE_LDFLAGS="${LDFLAGS}" LDFLAGS="${SAVE_LDFLAGS} -rpath /" - AC_LINK_IFELSE(AC_LANG_PROGRAM([], []), [git_cv_ld_rpath=yes], [git_cv_ld_rpath=no]) + AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])], [git_cv_ld_rpath=yes], [git_cv_ld_rpath=no]) LDFLAGS="${SAVE_LDFLAGS}" ]) if test "$git_cv_ld_rpath" = "yes"; then @@ -472,15 +472,9 @@ if test -z "$NO_ICONV"; then GIT_STASH_FLAGS($ICONVDIR) -AC_DEFUN([ICONVTEST_SRC], [ -#include - -int main(void) -{ - iconv_open("", ""); - return 0; -} -]) +AC_DEFUN([ICONVTEST_SRC], +[AC_LANG_PROGRAM([#include ], + [iconv_open("", "");])]) if test -n "$ICONVDIR"; then lib_order="-liconv -lc" @@ -500,7 +494,7 @@ for l in $lib_order; do old_LIBS="$LIBS" LIBS="$LIBS $l" AC_MSG_CHECKING([for iconv in $l]) - AC_LINK_IFELSE(ICONVTEST_SRC, + AC_LINK_IFELSE([ICONVTEST_SRC], [AC_MSG_RESULT([yes]) NO_ICONV= break], @@ -528,18 +522,12 @@ fi GIT_STASH_FLAGS($ZLIB_PATH) AC_DEFUN([ZLIBTEST_SRC], [ -#include - -int main(void) -{ - deflateBound(0, 0); - return 0; -} -]) +AC_LANG_PROGRAM([#include ], + [deflateBound(0, 0);])]) AC_MSG_CHECKING([for deflateBound in -lz]) old_LIBS="$LIBS" LIBS="$LIBS -lz" -AC_LINK_IFELSE(ZLIBTEST_SRC, +AC_LINK_IFELSE([ZLIBTEST_SRC], [AC_MSG_RESULT([yes])], [AC_MSG_RESULT([no]) NO_DEFLATE_BOUND=yes]) @@ -631,23 +619,19 @@ AC_SUBST(NO_INTTYPES_H) # # Define OLD_ICONV if your library has an old iconv(), where the second # (input buffer pointer) parameter is declared with type (const char **). -AC_DEFUN([OLDICONVTEST_SRC], [[ +AC_DEFUN([OLDICONVTEST_SRC], [ +AC_LANG_PROGRAM([[ #include extern size_t iconv(iconv_t cd, char **inbuf, size_t *inbytesleft, char **outbuf, size_t *outbytesleft); - -int main(void) -{ - return 0; -} -]]) +]], [])]) GIT_STASH_FLAGS($ICONVDIR) AC_MSG_CHECKING([for old iconv()]) -AC_COMPILE_IFELSE(OLDICONVTEST_SRC, +AC_COMPILE_IFELSE([OLDICONVTEST_SRC], [AC_MSG_RESULT([no])], [AC_MSG_RESULT([yes]) OLD_ICONV=UnfortunatelyYes]) @@ -931,18 +915,16 @@ AC_SUBST(NO_INITGROUPS) # # Define PTHREAD_LIBS to the linker flag used for Pthread support. AC_DEFUN([PTHREADTEST_SRC], [ +AC_LANG_PROGRAM([[ #include - -int main(void) -{ +]], [[ pthread_mutex_t test_mutex; int retcode = 0; retcode |= pthread_mutex_init(&test_mutex,(void *)0); retcode |= pthread_mutex_lock(&test_mutex); retcode |= pthread_mutex_unlock(&test_mutex); return retcode; -} -]) +]])]) dnl AC_LANG_CONFTEST([AC_LANG_PROGRAM( dnl [[#include ]], @@ -962,7 +944,7 @@ elif test -z "$PTHREAD_CFLAGS"; then old_CFLAGS="$CFLAGS" CFLAGS="$opt $CFLAGS" AC_MSG_CHECKING([Checking for POSIX Threads with '$opt']) - AC_LINK_IFELSE(PTHREADTEST_SRC, + AC_LINK_IFELSE([PTHREADTEST_SRC], [AC_MSG_RESULT([yes]) NO_PTHREADS= PTHREAD_LIBS="$opt" @@ -982,7 +964,7 @@ else old_CFLAGS="$CFLAGS" CFLAGS="$PTHREAD_CFLAGS $CFLAGS" AC_MSG_CHECKING([Checking for POSIX Threads with '$PTHREAD_CFLAGS']) - AC_LINK_IFELSE(PTHREADTEST_SRC, + AC_LINK_IFELSE([PTHREADTEST_SRC], [AC_MSG_RESULT([yes]) NO_PTHREADS= PTHREAD_LIBS="$PTHREAD_CFLAGS"