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author | Jim Meyering <jim@meyering.net> | 1996-12-21 01:56:50 +0000 |
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committer | Jim Meyering <jim@meyering.net> | 1996-12-21 01:56:50 +0000 |
commit | 58dfd6b4420c1d0d9136dfa98829ccd17853b064 (patch) | |
tree | b10ebcf306455a04b25fd831347552f3736adec1 /m4/ccstdc.m4 | |
parent | 5fc47138b1f01f5ec8d449585bd19abea4da7960 (diff) | |
download | coreutils-58dfd6b4420c1d0d9136dfa98829ccd17853b064.tar.xz |
copied from automake-1.1l
Diffstat (limited to 'm4/ccstdc.m4')
-rw-r--r-- | m4/ccstdc.m4 | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/m4/ccstdc.m4 b/m4/ccstdc.m4 new file mode 100644 index 000000000..727fea1f0 --- /dev/null +++ b/m4/ccstdc.m4 @@ -0,0 +1,61 @@ +## ----------------------------------------- ## +## ANSIfy the C compiler whenever possible. ## +## From Franc,ois Pinard ## +## ----------------------------------------- ## + +# serial 1 + +# @defmac AC_PROG_CC_STDC +# @maindex PROG_CC_STDC +# @ovindex CC +# If the C compiler in not in ANSI C mode by default, try to add an option +# to output variable @code{CC} to make it so. This macro tries various +# options that select ANSI C on some system or another. It considers the +# compiler to be in ANSI C mode if it defines @code{__STDC__} to 1 and +# handles function prototypes correctly. +# +# If you use this macro, you should check after calling it whether the C +# compiler has been set to accept ANSI C; if not, the shell variable +# @code{am_cv_prog_cc_stdc} is set to @samp{no}. If you wrote your source +# code in ANSI C, you can make an un-ANSIfied copy of it by using the +# program @code{ansi2knr}, which comes with Ghostscript. +# @end defmac + +AC_DEFUN(AM_PROG_CC_STDC, +[AC_REQUIRE([AC_PROG_CC]) +AC_MSG_CHECKING(for ${CC-cc} option to accept ANSI C) +AC_CACHE_VAL(am_cv_prog_cc_stdc, +[am_cv_prog_cc_stdc=no +ac_save_CC="$CC" +# Don't try gcc -ansi; that turns off useful extensions and +# breaks some systems' header files. +# AIX -qlanglvl=ansi +# Ultrix and OSF/1 -std1 +# HP-UX -Aa -D_HPUX_SOURCE +# SVR4 -Xc -D__EXTENSIONS__ +for ac_arg in "" -qlanglvl=ansi -std1 "-Aa -D_HPUX_SOURCE" "-Xc -D__EXTENSIONS__" +do + CC="$ac_save_CC $ac_arg" + AC_TRY_COMPILE( +[#if !defined(__STDC__) || __STDC__ != 1 +choke me +#endif +/* DYNIX/ptx V4.1.3 can't compile sys/stat.h with -Xc -D__EXTENSIONS__. */ +#ifdef _SEQUENT_ +# include <sys/types.h> +# include <sys/stat.h> +#endif +], [ +int test (int i, double x); +struct s1 {int (*f) (int a);}; +struct s2 {int (*f) (double a);};], +[am_cv_prog_cc_stdc="$ac_arg"; break]) +done +CC="$ac_save_CC" +]) +AC_MSG_RESULT($am_cv_prog_cc_stdc) +case "x$am_cv_prog_cc_stdc" in + x|xno) ;; + *) CC="$CC $am_cv_prog_cc_stdc" ;; +esac +]) |